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Datum Electronics Development Website Goes Live

07/02/2008 12:19:04

Today (24th September) the new Datum Electronics in-development website went live. The new website is a CMS with added tools to help aid SEO.

Datum Launch New Website

26/09/2007 10:25:30

Welcome to the brand new website from Datum Electronics. We have worked hard on the new site to help improve the layout and general feel of the site to make visiting our website a more interesting and enjoyable experience.

Working closely with Matrix e-business, an Island based web design agency, we have revamped the existing site and we hope you enjoy the new website. With new features, categories and datasheets on our range of products and services, we hope that the overall experience for our customers and suppliers is improved. We have also introduced an applications section and improved our news section to bring you the latest information and product updates on what is happening here at Datum Electronics Limited.

This is a very exciting time for Datum Electronics, and the new website is reflective of what we at Datum Electronics is all about. We hope you enjoy the site and keep an eye out for the latest developments here at Datum Electronics.

Accurate Power Measurement from your PTO tractor driveshaft

02/10/2007 09:48:25

Datum Electronics new Series 420 PTO Shaft Torque and Power Monitoring System will monitor and log the shaft torque, shaft speed and transmitted power accurately when testing new systems driven from all standard PTO Shafts.

The tractor's PTO or stub shaft, transfers power from the tractor to the PTO-driven machine or implement. Power transfer is accomplished by connecting a drive shaft from the machinery to the tractor's PTO stub shaft. Common examples include elevators, grain augers and silage blowers. The PTO and drive shaft rotate at 540 rpm (9 times/sec.) or 1,000 rpm (16.6 times/sec.) when operating at full recommended speed. At all speeds, they rotate in proportion to the speed of the tractor engine.

Efficient measurement and monitoring of this power can be a useful tool in research and analysis into the performance of a tractor transmission system highlighting efficiency savings measurement and control.

Power Monitoring
Robust Design for use in field applications
IP 54
Easy Installation
Accurate Results (0.5% Accuracy)
Direct USB Interface into PC or laptop

The Series 420 PTO System has a non-contact transmissions system that provides a digital output directly proportional to Torque. Supplied as a complete transducer with bearings to support the stator unit, this robust design gives performance data by actual measurement on the rotating drive shaft. It is suitable for most power take off applications.

The PTO system has a female coupling on one end and a male fitting on the opposite end. The female end is coupled to the male end of the application. The PTO system acts like an extension adaptor, with the male end replicating the male end of the application. The torque and speed signals are transmitted from the shaft to a static cover assembly.

Measuring torque in both directions, clockwise and anti-clockwise the system provides accurate readings of Power, Torque and Speed logged to a T310TSP Handheld indicator. If required, the system can also be adapted to record and analyse the data onto a PC or laptop with our TorqueLog software.

Standard Configurations include:

Male / Female 1” 3/8 x 6 spline
Male / Female 1” 3/8 x 21 spline
Male / Female 1” 3/4 x 6 spline
Male / Female 1" 3/4 x 20 spline

Operating Speed:

540 / 1,000 rpm as standard (up to 3,000rpm if required)

Power Rating (min):

Standard 1"3/8 shaft configurations
Measures Power 135HP or 101kW at 540rpm
Measures Power 253HP or 188kW at 1000rpm

Standard 1"3/4 shaft configurations

Measures Power: 190HP or 141kW at 540rpm
Measures Power: 350HP or 261kW at 1000rpm

Torque Rating:

Measures Torque up to a maximum of 1,800Nm on all standard 1"3/8 shafts
Measures Torque up to a maximum of 2,500Nm on all standard 1"3/4 shafts

Major New Torque Calibration Facility

12/10/2007 11:38:53

Datum Electronics have taken delivery of the largest vertical torque calibration machine in the UK. The machine will enable the company to calibrate Torque Transducers up to 200,000Nm with a high degree of accuracy.

The machine has been designed and developed in conjunction with Mole Designs chief designer Kerry Wall (former head of GKN Environmental Testing). The equipment has a capability to apply torque of up to 200,000Nm to Torque Sensors and Transducers up to 1 meter in diameter.

Calibration up to 200,000Nm

The loading and measurement system provides four working ranges of 2,000-30,000Nm, 10,000-64,000Nm, 20,000-125,000Nm and 20,000 -200,000Nm. The torque monitoring system is based sets of 6 load cells configured to provide the total torque applied to the torque transducer under test. Each load cell applies its load on a precise radius. The loading and display system allows fine adjustment of the load applied to ensure that the torque is driven precisely through the axis of the cell.

Technical

The transducer under test is mounted on a free running rotary table and constrained at one end by the rig structure. Balanced forces are applied to the rotary table and transmitted to the transducer under test.
The forces and the point of application of these forces are accurately measured to provide an overall measurement of the torque applied.

For each measurement range two sets of three load cells record the force applied to an accuracy of 0.02% (1:5000) for the full scale of the range. The radius of each loading point is measured to 0.05mm which is 1:10000 of the total loading radius. Each torque measurement takes the sum of three loads and three radii.

Manufacture of Torque Sensors

Datum Electronics manufacture torque transducers both rotary and static for loads up to 500,000Nm the new facility will allow for the in-house calibration of these transducers. The company also provides a service to convert existing machinery components and couplings into torque transducers. These conversions can be either made at the Datum factory or on site as with large marine shaft installations (up to 1100mm diameter) or large power plant installations.

The facility has been installed to service the requirements of Datum’s customer base in power generation, mixing, drilling, marine propulsion systems and general heavy engineering. The demands from the industry for more accurate measurements of power and drive torque can now be met.

More Information....

For full details of your calibration requirements and servicing needs, please contact our sales team:

Telephone: +44 (0) 1983 28 28 34
Email: web@datum-electronics.co.uk

Alternatively complete our Contact Form

Underwater Torque Transducer proves the delivered power of model Turbine

16/10/2007 10:20:19

The move towards sustainable energy throughout the world is driving the development of many systems to generate power. One such system, a tidal energy converter under development by Scotrenewables (Marine Power) Ltd., has undergone trials at Qinetiq’s hydrodynamic testing facilities.

Underwater Torque
Essential measurement of output shaft torque and power within this trial was complete by using a Datum Electronics RS420 Series Torque transducer sealed for underwater use. The transducer used was designed as a direct replacement for the output shaft.

The rotor is inductively powered from the stator with no mechanical contact between them, this removes the need for bearing and the possibility of transmitting mechanical forces from the stator to the rotor.

Product Diversity
The RS420 Series is available to fit any shaft from 15mm diameter up to 500mm. It can be provided as a standard fit transducer or engineered into and existing transmission shaft. Datum Electronics have converted over 100 specialist designs shafts using the RS420 system. Its key advantages are its small size and the flexibility of engineering it onto an existing shaft. In many cases this provides great cost saving as other parts of the transmission line can remain unchanged.

Slip ring replacement transducers now available

18/10/2007 15:11:43

Need to replace your old style Torque Transducer?

Do you have an older style slip ring torque transducer? including EEL type (Westlands), HBM, Norbar, IML or other manufacturers instrumentation. Is the transducer performing as expected?

Datum Electronics can provide direct replacements for Slip ring based full bridge strain gauge output transducers with NO NEED to replace your current instrumentation!!!

Just fit our torque transducer in place of your old device and you will have a state of the art, modern designed torque transducer utilising the very latest technological advancements.

The M420 torque transducer offers a non-contact transmission of digital data with a high level of reliability, utilising modern manufacturing techniques.

Interested? Give us a call on +44 (0) 1983 28 28 34
Or drop us a line via our contact form

Our Sales team will be happy to assist you with your enquiry.

Torque Sensor Measuring up to 200kNm

22/10/2007 15:49:25

Datum Electronics undertook the project to provide a torque sensor capable of measuring up to 200,000Nm for Hydraulic Testing.

Utilising existing technology that Datum Electronics use in our range of torque transducers, the main challenge was how to assemble such a large torque sensor. The shaft element was supplied following Datum Electronics approval and the torque sensing equipment was fitted to the shaft providing valuable torque data for MacTaggart Scott & Co Ltd.

The transducer was designed based upon the concepts and processes that is already used in our RS420 and FF420 series torque range. These systems output torque data with a completely separate rotor and stator assemblies without the need for bearings. This greatly reduces costs associated with maintenance and upkeep of bearings, and also reduces the transducer weight, including the weigh impacting upon the shaft.

Having looked at this project in some depth, we have the ability to increase our torque measuring capabilities above and beyond the 200kNm mark. We have the ability to measure 500kNm and even beyond this. The only real restriction is the size and handling of the shaft element.

Datum Electronics would like to thank MacTaggart Scott & Co. Ltd., suppliers of High Torque Low Speed Hydraulic Motors, for their assistance and contribution to the successful completion of this project.

For information on torque transducers available from Datum Electronics, including requirements up to and including 500,000Nm contact one of our sales advisors or complete or contact form

Tel: +44 (0) 1983 28 28 34
Contact Form

Datum Electronics - Consultancy Group for Torque Measurement

31/10/2007 09:41:03

Datum Electronics Limited has launched a new torque measurement consultancy group. The consultancy group are able to offer advice on a range of topics including the integration of torque sensors into OEM machinery, the measurement of torque in difficult and extreme environments, the measurement of torsional vibration and small fluctuations.

The group will call on the expertise of the design team who have in the last ten years completed projects around the world to integrate sensors into test rigs, machinery, vehicles, process vessels. The group will also be able to call on 4 associated engineers with over 120 years of expertise who have worked with Datum Electronics in recent years to measure torque and strain at high rpm’s, high temperatures, on aircraft, helicopters, ships and much more.

The individual specialists have four specific areas of experience in: Test Rig Design, High Speed Rotary Systems, Data Analysis, Energy Saving Programs and Strain Gauge Applications this coupled with Datum own engineering teams expertise in transducer design, sensor interface electronics, small signal transmission and analysis will have a solution to most torque measurement requirements.

If you have a specific torque or power measurement requirement that you would like to discuss with a member of the team or send to Datum Electronics in writing we will be please to assist you. We can either provide advice on a simple problem or provide a proposal to work through a more in depth investigation with you.

Consultancy Group

TEL: +44 (0) 1983 28 28 34
Email: web@datum-electronics.co.uk
Contact Form

Network Load Cell Amplifiers with USB or RS485 Interface

21/11/2007 15:01:35

Datum Electronics are pleased to announce the launch of a brand new range of Load Cell Amplifiers that can be networked with a number of load cells or other full bridge sensors including pressure sensors and Datum’s very own Bolt-on sensor range.

Network up to 50 Load Cells
The Type 135 and Type 136 Load Cell Amplifiers are able to network up to 50 load cells with the added ability of logging to a PC or laptop with suitable logging software.

This can be achieved with the Datum Electronics NetDisp Software which displays and logs graphically the information provide by the load cell. This is a windows based application suitable for most commercial available PC systems and controls. Alternatively, there is also the option of utilising an existing user’s software.

Interface Options

RS485 Type 135 RS485 Load Cell Amplifier

USB Type 136 USB Load Cell Amplifier

NetDisp Software
The Datum Electronics NetDisp Network Software is a Windows™ PC based software package, designed to gather data from up to a total number of 50 Load Cells, connected to an RS485 Network via Datum Electronics Type135 , RS485 Network Strain Gauge Amplifiers.

Each Load Cell on the Network is individually calibrated to give an output in Kg.
The software package sequentially reads the current load value from each cell and processes all load values to provide Display and Group Sum functions.

The software allows for the load value of groups of cells to be summed together to give a total load for the group. This Total Load is treated in the same way as
Individual Cell Load for display & alarm functions.

A “Standard NetDisp” system includes up to 16 visual on screen alarms and would comprise the following components:
• NetDisplay Interface Module
• Includes regulated power supply for the networked amplifiers.
• “NetDisplay” software Disk and “End User license”.
• Choice of RS485 or USB interfaces into the PC.

Enclosure
Housed within a Die Cast Aluminium enclosure, this robust amplifier is ideal for applications requiring a number of distributed strain sensors logged into a single PC with interface software.

For more information on Networking and Load Cell Amplifiers, please contact one of our sales advisors:
Contact Us
Tel: +44 (0) 1983 28 28 34
Email: web@datum-electronics.co.uk

Torque Transducers

05/12/2007 15:34:16

Unique, Genuine and Reliable non-contact technology in the Series 420 rotary torque transducers from Datum Electronics.

The 420 Series torque transducers operate with no direct contact from the rotor to the stator; they are more efficient, cost effective and have improved longevity than previous models in the marketplace.

Accurate & Dependable Torque Measurement
These torque measuring systems are available either as complete torque transducers or as separate rotor & stator assemblies ideal for high speed test rig and OEM applications. They provide a system accuracy of 0.1% of full scale either into a PC or laptop via USB, independent control system or a rack-mounted Torque Indicator.

All Datum Electronics torque transducers have a strain gauged central element and a set of rotating conditioning electronics, the digital signals from this are digitally transmitted to the non-rotating body or stator of the system. The Series 420 has three different types of torque transducer, each with their own distinctions in terms of functionality and for use within different environments.

M420 Torque Transducers

The M420 is our standard rotary torque transducer. The standard transducer has the rotary shaft and a stator built into its static housing. The housing is mounted on the shaft with bearings. The M420 series is available in 4 standard sizes to meet the needs within a torque measuring environment.

Transducer Size & Definition
Size 1     0-100Nm
Size 2     0-500Nm
Size 3     0-2,000Nm
Size 4     0-10,000Nm

The M420 is highly accurate, with a combined error of 0.1% as standard on all M420 Torque Transducer sizes. They provide a digital data signal (USB) which can measure torque, Speed and Power. They are suitable for use on test rig applications and permanent installations.

FF420 Torque Transducers

The FF420 is our Flange/Flange rotary torque transducer. The transducer element in this case is a flange-flange coupling with the strain gauges and the rotor electronics mounted in the centre section of the coupling. The signal is transmitted across a digital transmission coupling link to the stator that is mounted around the centre of the coupling.

The rotating element of the transducer is not limited by bearings; therefore it can be used at higher speeds, and places no bearing loads on to the shaft. The stator needs to be mounted in relation to the shaft within an operating envelope of +/- 3 to 5mm. We have standardised our range of torque transducers for clear and simple applications and specifications.

Transducer Size & Definition
Size 1     0-250Nm
Size 2     0-500Nm
Size 3     0-2,000Nm
Size 4     0-10,000Nm

The FF420 torque transducer is highly accurate with a combined error of 0.1%. It uses a true ‘non-contact’ transmission signal. Another advantage of the FF420 is that is tolerable to misalignment, because of the way the transducer is engineered. The standard ranges are compatible with DIN Size flanges.

RS420 Torque Transducers

The RS420 is our Rotor/Stator Transducer with a keyed shaft and a Free Standing Stator. This type of transducer is very similar to the FF420 but has keyed or splined shafts as opposed to flanges.

The transducer element in this case is a keyway or splined shaft with the strain gauges and the rotor electronics mounted either on the shaft, or inside the shaft depending upon shaft size and feasibility. The signal is transmitted across an inductive link to the stator that is mounted around the centre of the coupling, with a visible air gap. This type of torque transducer has no bearings, and there is no secondary load on the test shaft which allows for multiple shaft sizes.

Because the torque transducer has no bearings, it can be used at higher speeds, running much faster and longer than traditional transducers containing bearings. The stator needs to be mounted in relation to the shaft within an operating envelope of +/- 3 to 5 mm. We have standardised our range of torque transducers for clear and simple applications and specifications.

Transducer Size & Definition
Size 1     0-100Nm
Size 2     0-500Nm
Size 3     0-2,000Nm
Size 4     0-10,000Nm

The RS420 is highly accurate with a combined error of 0.1%. It uses a true ‘non-contact’ transmission signal. Another advantage of the RS420 is that is tolerable to misalignment, because of the way the transducer is engineered.

Series 420 Torque Transducer Features

Among the enhanced features are the additional options for:
Direct Digital Data (USB)
Direct Analogue Output
Direct Serial Outputs (RS232)
Increased Sampling Rates (100, 1,000, 5,000, 10,000, 20,000sps)
Analysis Tools for enhanced data analysis

Key System & Features of the Series 420 Rotary Torque Transducers

Accurate On Shaft Torque Measurement
Non-contact Power and Signal Transmission
Proven Technology
Low Maintenance
Simple Linear Calibration
Engineered to fit most drive components
0-25,000rpm
No restriction on shaft size
Rotary and Static Torque Measurement
Self-Test Facility
Output Options (Direct USB or RS232 output)
TorqueLog Software
4-20mA or 0-10Vdc
CAN Bus
Specialist Data Analysis
AC Coupled Data
Fast Burst Mode Data to 30,000sps
Standard Data Output to 5kHz
Event Linked Outputs
Competitive Pricing
Standard Transducer Range
Fast Turn Round on Non-standard Shafts and Couplings
OEM Production Solutions

The new range is complemented by Datum’s ability to engineer special torque solutions with Transducers, Indicators and Software tailor made to meet customer requirements.

For full details, prices, specifications and how to buy, please contact us via
Contact Form
Email
Tel: +44 (0) 1983 28 28 34

Series 430 Torque Trials Kit

07/02/2008 12:19:21

The Datum Electronics Torque Trials Kit will supply all equipment necessary for assembly of a shaft torque (power) trials kit which can be utilised for industrial and marine ship shafts, between 150mm – 1100mm. An additional adaptor is also available for smaller shafts starting from 30mm in diameter.

Accurate Power & Torque Measurement

Datum Electronics Series 420 Marine Torque Trials Kit has been designed to measure the true mechanical torque, power and speed of your shaft. The System provides an accurate tool to assess and monitor propeller shafts on ships by measuring shaft speed, torque and power. This trials kit can be installed on a ships propeller shaft or shafts and uses strain gauge technology providing a highly accurate non-contact method of measuring shaft torque.

Long-Lasting Battery

The standard built-in battery can last between and 20-24 hours and is suitable for test applications; batteries are (Basic system) charged in-situ, by plugging in the inclusive charger. It is necessary to stop the shaft rotating to achieve this whilst the battery charges.

Up to 50 hours continuous Usage

Another feature available is to purchase the optional off shaft battery holder and charger unit. This enables batteries to either be replaced or re-charged as and when necessary. Additional batteries are also available. This reduces the time the shaft is stopped so the battery can be swapped quickly.
An additional optional feature may be purchased to extend the operational time to approx. 50 hours continuous use with a separate charger and an additional On-shaft battery unit and two spare batteries.

The Trials System

The Datum Electronics Torque Trails Kit is simple and easy to install. The System provides a display of the torque on the shaft. The torque signal is derived from strain gauges installed on to the shafts. The signals are transmitted from the shaft rotor to the shaft stator unit providing a display of torque.

Measuring Torque on a shaft can provide an array statistical data providing useful information on shaft performance. The Datum Electronics Torque Trials Kit does more than just measure Torque; it can also be used to verify power outputs from engines and motors. The following data can also be measured and analysed:

Power Transmission
Torque Trials
Vibration and Torsional Acceleration
Power Transients
Peak Torque Levels
Power Delivery
Shaft Vibration

Data Analysis

The Datum Electronics Torque Trials Kit accurately measures the on-shaft torque (kNm), speed of the shaft rotation (rpm) and the power (kW) that is going through the shaft. The data is transmitted from the shaft in a digital format that can be processed and scaled off-shaft.

The Trials Kit, once installed on shaft, transmits digital data (RS232) which can be monitored, analysed and recorded into our monitoring system. Because the data is digital, it is noise immune and easy to process with a USB or serial interface. This provides a clear clean signal of Torque with a system reliability of 0.1%

Installation of Trials Kit

One of the advantages is how easy the instrumentation is to install, set up, test and operate. The trials kit consists of three main component elements making this trials application system as easy and simple and possible.

The Shaft - The first basic element of the system requires a shaft between 60 – 1100mm in diameter which is accessible. The trials application uses strain gauges on the shaft which can determine the shaft torque, speed and power of the shaft. One of the first and most important aspects in the installation of the Series 420 Trials Kit is the on shaft application of the strain gauges. The strain gauges must be applied in the correct manner, the importance of attention to detail and precision adherence to instructions cannot be over stressed.

On-Shaft Electronics - The On-shaft electronics consist of a transmitter module and battery supply. Both modules are held to the shaft with a strapping kit. The data signal is transmitted off shaft to Receiver Module.

Receiver Unit - The Receiver Unit receives the data transmitted from the on-shaft transmitter module. The data is then converted and sent to a PC or laptop which will display and record the on-shaft data which will contain the torque data from the shaft and the speed data from the mounted speed sensor. The software utilises the torque and speed data providing power output from the shaft.

System Advantages
The Datum Series 420 Shaft Power & Torque Trials Kit has a number of advantages over other trials applications. The system is simple and easy to install logging directly to a PC or laptop with the aid of its installation software Disk. Other advantages include:

Measures Shaft Power, Shaft Torque & Shaft Speed as a basic function
Easy to install with a step-by-step guide
Logs, records and displays ‘real time’ data
Portable & lightweight design
User Friendly software
Compatible with 2 data channels and shaft speed

Additional Information
For full details please click Torque Trials Kit

Experts in Torque Measurement

26/02/2008 15:05:36

Datum Electronics are an established supplier of Torque Transducers and other torque measurement systems based in the UK. Our torque transducers and torque sensors use strain gauges bonded to a shaft for reliable and accurate torque measurement solutions.

What is a Torque Transducer?

Torque Transducers, or Torque Sensors measure torque in a variety of methods. The basic principle is in essence is a very simple mechanical process, it is a measure of the ‘force’ being used in turning (or attempting to turn) an element. When a force or ‘torque’ is applied to a shaft; the shaft twists (by a very small amount). This twisting produces a ‘stretch’ in the material of the shaft, in a direction at 45 degrees to the axis of the shaft, between points on the shaft that are moved apart by the twisting motion. The material of the shaft also sees a ‘compression’ in the opposite 45 degree direction.

Datum Electronics torque transducers utilise this shaft bending and measure the change in order to calculate the torque. This measurement is achieved by the use strain gauges bonded to the shaft, measuring the strain induced in the shaft by the applied torque or ‘force’. There are various methods of measuring this twist through a shaft; strain gauges are recognised as one of the most reliable methods, if you have the expertise to achieve this.

Strain Gauges are incredibly accurate, if you have the expertise and experience of using and understanding how they work. They have been traditionally associated with in-accurate and un-reliable measurements. If used correctly with the right understanding, they are very reliable, stable, robust and a cost effective method of torque measurement.

Definition of a Strain Gauge

A strain gauge is a small electrical ‘element’ printed on a non-conductive substrate. The pattern of the element is arranged so that if the gauge is stretched (or compressed) in one direction (along operating axis of the gauge), the resistance of the element increases (or decreases) in relation to that stretch. A stretch perpendicular to the axis of the strain gauge has little effect on the resistance of the element.

If a gauge is bonded to the shaft, with its axis aligned with the direction in which the shaft material stretches when a torque is applied, the strain gauge will also stretch and therefore the element will increase in resistance. If a gauge is bonded to the shaft, with its axis aligned with the direction in which the shaft material compresses when a torque is applied, the strain gauge will also compress and therefore the element will decrease in resistance. In the Torque transducer, strain gauges making up four resistive elements are bonded to the shaft. Two elements are aligned with the direction of Tension (stretch). The remaining two are aligned with the direction of Compression.

The four resistive elements are electrically connected in a ‘Wheatstone Bridge’ configuration. The Wheatstone Bridge configuration is appropriate for measurement of the small resistance changes produced in the strain gauges, as the combination increases and decreases in resistance it produces a change in output voltage which is only proportional to excitation voltage and change of resistance between opposing elements, not to any overall change in resistance such as might be produced by a change in temperature.

Torque Transducers – Measurement Defined

The Datum Series 420 Rotary Torque Transducers transmit digital data providing the end user with clean and definitive data. The on-shaft signal provided by the Wheatstone Bridge is amplified and converted into a digital value. This signal is transmitted off the shaft and then processed digitally and amplified; this signal is taken off the shaft and then processed to provide a measurement of torque. Digital Data can be provided with up to 24 bit resolution or up to 96,000 samples per second providing valuable and accurate data for the end user.

Series 420 In-built speed sensor

Our rotary torque transducers provide not only torque measurement but also speed indication (rpm). Combining both torque and speed data allows you also to measure power as a calculated figure.

The series 420 torque transducers measure speed by counting 1 pulse per revolution and then converts this figure to (rpm). Using an in-built hall-effect sensor, our torque range is capable of measuring speed at up to 20,000rpm.

Torque Transducer Specifications

Torque Measurement 0 - 10,000Nm as standard.
System Accuracy 0.1% FSD
True non contact torque measurement.
M420 Torque Transducer
FF420 Torque Transducer
RS420 Torque Transducer
Accurate and Reliable measurement
Output of digital RS232 with USB option
Analogue Output also available
Flexible shaft fittings (spline/keyway shaft)
Modular System Assembly
Non-contact Signal Transmission
Proven Technology
Low Maintenance
Simple Linear Calibration
Engineered to fit most drive components
Rotary and Static Torque Measurement
Optional Analogue Data Output
Optional Speed / Power Output

For more information contact our sales team
Tel: +44 (0) 1983 28 28 34
Contact Form

Torque Measurement Specialsts on Rotating Machinery

06/03/2008 08:48:48

Improved efficiency, accurate monitoring, reduced failure rates. Over the last few years a combination of market led demand and the availability of new technology has led to a large number of developments that will find new applications. These will also provide great benefits to the many modern industries that demand efficiency and reliability to improve and maintain markets and position in an increasingly competitive World economy.

Torque Transducer Developments

Torque and Strain Measurement techniques are utilised and widely understood in many industries but new developments by us, in signal processing and transmission have greatly enhanced our torque transducers capability and worth. Our torque transducers can now be supplied into systems able to provide more information than we knew could be available as little as 5 years ago. Able to fit applications that demand ever smaller and more environmentally demanding space, combined with the latest in technology and design, Datum Electronics is providing the torque transducers of the future for the industries of the future.

Specialist Torque Measurements - Dynamics, Ripple and Transient Events

As an extension to the basic range of torque measurement products, Datum Electronics have the capability to prepare specialist measurement systems to assist with the analysis of dynamic torque in a wide range of applications. Our capabilities include the ability to measure high frequency “torsional” changes within a transmission system. These changes will show Torsional Vibration – out of balance and unwanted drive vibration components. Torsional Ripple – gear meshing, blade cycling, offset loading. Dynamic Events – gear changes, braking and acceleration.

We can configure measurements to be taken to look at events up to 15KHz in burst mode and 5 KHz in a continuous mode. The system will allow the selective measurement of small fluctuations as low as 1:10,000 of the full shaft torque range. The data can be made available in graphical, analogue or digital formats. Datum Electronics can advise on the optimum system to collect the data from your transmission line, and with the analysis of the data. Examples follow of how this can be utilised are as follows:

(I) To monitor the wear characteristics and life, of gear teeth

In order to monitor the meshing of the teeth within gearboxes a requirement existed to measure the average drive torque through the test cycle and to control the test rig. Most standard torque transducers would accomplish this. However a second set of instrumentation was also required to measure and monitor the meshing of the gear teeth. The shaft in this case was operating at 6000rpm and the primary gear had 30 teeth giving a meshing frequency of 3000 teeth per second. With standard transducer sampling at between 100Hz and 3KHz it would supply insufficient data for analysis.

Datum Electronics Solution – Utilising cutting edge technology, we developed a new torque transducer with a high sampling rate that could look at the torque on the input and output shafts providing:

Average torque signal for control
Bursts of high-speed “ripple” gear meshing data

This torque transducer provided average torque with a control update at 50Hz with feedback to the test rig drive. However, the burst mode provided 30,000 samples per second for 2 seconds to look at the meshing torque. The burst of data was timed every 30 minutes providing 60,000 samples for analysis. The specially developed Datum Electronics software, used to collect the data on the PC was able to package the high quantity of data suitable for use direct into an Excel spreadsheet.

The same family of “Series 420” torque transducers has also been used to provide data on torque events such as turbine braking where the burst mode was triggered to provide 1 second of data (i.e. 60,000 samples) to plot the transient torque.

Enhancements such as these added to standard monitoring and control transducers will enable any company with service and design personnel to gather more specialist data from standard equipment completing every day functions.

(II) To test the energy transmitted through a gearbox at specific frequency bands

The torsional vibration on a transmission line contains many frequencies. It is not uncommon that other higher magnitude vibrations at different frequencies mask the frequency at which measurements are required. The magnitude at the frequencies to be measured was minute at 0.02% of the full shaft torque.

Datum Electronics Solution

A specialist torque module was developed that was able to look at both the underlying torque level and the fluctuation within that level. The transducers were designed to transmit a data stream that could be separated giving two channels or components required:

The underlying torque level for control
The fluctuation for analysis

The configuration of the transducer allows for multi-level filtering of the raw signal to remove any dominant unwanted areas and isolate the required or problem frequency. The transmitted conditioned signal was provided as two 4-20mA outputs, the control channel giving 4-20mA for 0-2000Nm and the analysis channel giving 4-10mA for 0.4Nm (fluctuation). A band pass filter in the analysis channel isolated at a key meshing frequency of 350Hz +/-50Hz.

Theory into practice - Our ability to add features of this type to torque transducers and power meters will enable engineers to diagnose and monitor a much wider range of parameters on their system. A good example is the Wind Energy business, with suitable configuration of gearbox frequencies and propeller frequencies will be related to items such as bearing failure, shaft whirling and propeller cavitations.

With remote monitoring utilising this technology, the possibilities are exciting and boundless. Real and accurate monitoring of remote systems means problems can be spotted quickly and dealt with, well before it becomes a critical problem.

(III) To measure torque underwater on a shaft, with, both radial and lateral oscillation

The problem in this instance was large shaft movement in relation to any local fixed position around it. As with any submersible device the use of bearings was to be avoided. The torque on the driven shaft was to be measured over a large dynamic range with particular interest at very low levels, therefore the drag of any rubber seal, bearing assembly or similar restriction was undesirable.

Datum Electronics Solution
For some time, our 420 series torque transducers which are required for long running tests have been manufactured with a completely separate rotor and stator assemblies. These are able to operate with visible air gaps of up to +/-7mm between the rotor shaft and the stator.

A solution to the sub ea problem was relatively simple by producing a marine version the standard assembly that could be used on conventional ship shafts and increased power storage capability on the rotor to allow the transducer to operate outside its normal inductive power envelope.

This solution allowed continuous transmission of average power transmitted even in heavy sea conditions where the rotor could not be fully constrained.

Significant Improvements in mixing process control

08/04/2008 16:34:32

Rotary mixing processes in a diverse range of industries from Bio-Chemical to Concrete production show significant changes in viscosity as the mixing cycle progresses.

Accurate & Reliable Measurement for Mixers

An accurate and reliable real time measurement of the mixing viscosity has often been a missing element in the process control loop. Systems are produced that look at the input drive power of the motor, however these have limited accuracies and repeatability.

The Datum Series Rotary Power System (Torque) can provide a wide range of solutions. The system is modular and can be fitted to most mixer shafts or drive trains. The data output will interface to most PLC, PC and SCADA based control or data acquisition systems.

Direct measurement of the shaft power can however provide a stable and accurate control input that will enable improved quality control and energy savings to be implemented.

Flexible options for data output

The data from the direct shaft power measurement will provide :-

Average Input Power to an accuracy of 0.1% with a repeatability of 0.04%
A total of the energy input into the process
A measure of the power fluctuation during the mixing process which is a good indicative measurement the mix consistency
A measure of mechanical power input overload to protect the drive system

Wide range of industrial uses

Our Rotary Mixing Systems have been implemented on a wide range of industrial plants and applications from shaft size in test vessels of 10mm up to shaft hubs in heavy processes up to 450mm in diameter and beyond.

The control signals can be provided as averaged data or real time data (or both) according to the process. The averaged data will provide a highly stable and accurate measurement of power to indicate the changes in the process or the stop point of a process. The real time data can show the small fluctuations in the data. The standard outputs for the data are 4-20mA, 0-10Vdc or USB serial data.

For more details on our Rotary Power Systems for Mixers please contact our sales team
Contact Form
Tel: +44 (0) 1983 28 28 34

Distributors & re-sellers required for torque and sensing equipment

10/04/2008 11:47:51

Datum Electronics Ltd is a UK based company specialising in providing definitive designed solutions within the field of sensing and testing

Distributor Network

As a result of an increase in recent sales opportunities, we are looking to expand the distributor network for its range of Sensing and Torque related products and systems within the following areas:

Brazil and South America
Eastern European area
Russia
Spain
Italy
Netherlands
Scandinavian (Denmark, Norway and Sweden)
South Africa
Turkey
USA

Companies selling into industrial markets throughout the World are being offered the opportunity to increase their current portfolio of products, with special price deals available on the following products.

Products

Rotary Torque Transducers
Static Torque Sensors
Torque Sensors
Torque Trials Kits
Marine Torsionmeter Systems
Shaft Trails Kit
Load Cell Amplifiers
Bolt-On Strain Gauges
Load and Torque Indicators

Datum Electronics are currently seeking the suitable companies to work as partners alongside our UK office for the Specific regions listed above.

This is a fantastic opportunity to become a Distributor, Re-Seller or Agent for a leading manufacturer of Torque and associated products. Please contact us, and we will be happy to discuss how you can become a part of the Datum Electronics team Worldwide.

You can contact us now
Tel: +44 (0) 1983 28 28 34
Email: web@datum-electronics.co.uk
or via our website contact form for more information.

If your company is already selling products or services in the same marketplace, as a manufacturer or re-seller, we can also work with potential partners on OEM products with re-badge of products to your requirements etc. or if you are interested in selling Datum Electronics products in one or more countries, please contact the International Sales Division at web@datum-electronics.co.uk in the UK.

We look forward to hearing from you

Datum Electronics

Testing Components of Drive Trains

21/04/2008 15:59:43

United States Patent: 20070240517

The US Patent #20070240517 contains information relating to a driveline for testing drive train component of a vehicle which includes a torque sensor (RS420) supplied by Datum Electronics.

Datum Electronics specialise in the measurement of torque for various applications across a range in industries including marine, construction, agriculture, process & control, and test rigs. We have worked closely with an associated company to provide effective torque sensor aimed at providing effective data designed to improve testing capabilities of vehicle drive trains.

Testing Differential Gear Assembly

In this example it was used to test a differential gear assembly however it is not a restrictive design, the Datum RS420 torque sensor could be applied to other components and drive train analysis including gear boxes, or a transfer box of a four wheel drive. These are two examples; there are many other applications that would be suitable for the Datum Torque Sensor range.

As part of the processes involved in the design, testing and control of drive trains within the vehicle industry, apparatus can required to monitor and understand NVH which indicates Noise, Vibration and Harshness within the drive train system.

Noise, Vibration & Harshness (NVH) Testing

There are a number of techniques that were considered for the analysis of NVH. Testing also stipulated that measurement system had to be functional, with avoidance of jamming within the gears or bearings. One option considered included the use of an array of microphones, used to monitor noise output, whilst the component is driven by an electric motor which also tests the functionality of the component. Another option uses accelerometers to detect vibration. Another uses a laser vibration detector. Each of these techniques would provide results of varying reliability and repeatability.

Datum RS420 Torque Sensor - Drive train torque measurement

The option chosen was our RS420 Torque Sensor which best met the criteria for the test and measurement of the drive train. Within the set up of the drive train, the Datum RS420 Torque Sensor was installed on the input drive line. The RS420 torque sensor comprises a rotor on which are mounted strain gauges and signal processing circuits, a stator and an interface which inductively transfers power from the stator to the rotor for powering the circuits and transfers processed signals from the strain gauges to the stator. The advantage of this particular system is the completely separate on-shaft rotor unit, and static unit which transmit the digital torque signal.

The torque transducer on the input drive line produces a digital signal. The sampling rate is about 1 KHz within this application. We can expand upon this sampling rate, however this was the sampling stipulated by the end user. The relatively low sampling rate limits the drive line rotational speed making it possible to gather data samples of the torque fluctuations.

The RS420 torque sensor feeds back data to a torque controller which takes a measure of the torque applied by the drive line to the drive train component under test. The controller compares the fed back torque measurement with a reference torque produced by a reference source to control the motor. The reference source causes the torque to vary in a predetermined manner and the torque controller cause the torque applied by the drive line to vary in the predetermined manner to a precise tolerance.

The torque sensor, as well as being installed onto the input drive line, can also be applied to the output drive line within a test system. Within this example, the output drive line is a vehicle axel, which the sensor outputs variations in torque signals. The data from the torque sensor is transmitted to a data acquisition device for feedback and control within the test system. The axel is driven at a fixed speed whilst the torque variation is applied within the input drive line under test.

RS420 Torque Transducer - Benefits

The benefit of having a torque sensor within this type of test rig arrangement is to detect torque variations originating from the operating component under test as close as possible to the source of variations to reduce the noise and impact of the other components within the drive line affecting the raw torque signal. Further data analysis is available to understand and expand upon the torque fluctuations and variations.

RS420 Analysis Options

We can provide further systems to analyse the torque ripple within drivelines. Our torque sensors can detect resonance frequencies within the system and focus in on the errors of concern within the system. Detecting potential sources of error within these systems can be compared to finding a needle in a haystack, with modern high precision mechanical engineering and complex signal processing and control. Our torque sensor can improve efficiencies by sensing and identifying very small torque ripple or variations across a dynamic range, against a very small signal to noise ratio.

In summary, our torque sensors have become an integral part of driveline test apparatus with the purpose of testing Noise, Vibration and Harshness (NVH). Having confidence in the torque results and analysis from our RS420 torque sensors mean that the test results are meaningful and accurate to avoid rejecting good components and accepting bad components. Please contact us if you would like any more information on our Torque Sensors and analysis options for effective monitoring of drive trains.

Contact our sales team for further information on our torque sensors and transducers on how they can aid the testing of drivelines.

Contact Info
Tel: +44 (0) 1983 28 28 34
Contact Form
Email: web@datum-electronics.co.uk

Drive Trains - Analysis & Control with Datum Electronics

25/04/2008 11:34:56

Datum Electronics in partnership with George Kingsbury engineering, have been included within a US Patent award for a system which will monitor, analyse, and help understand how Noise, Vibration and Harshness (NVH) affects all manner of drive train systems.

RS420 Torque Sensor

The Datum Electronics Torque sensor has been developed to give a much more accurate way of capturing the data required, than other technologies currently employed such as Acoustic monitoring, accelerometers, and laser techniques. Our technology development has proven to outperform all of these by a long way with high quality, reliable data delivery.

High Data Sampling

Datum Electronics can now provide transducers able to measure at up to 90,000 samples a second.

This effectively means that the torque signal can be deeply analysed, and reveal a wealth of previously unavailable information about the system under test.

Also by utilising a torque transducer, it makes it possible to get as close as possible to the source data without interference from other drive line components.

More than just average torque measurement

Datum Electronics systems and torque sensors can now provide a lot more than our competitors who mostly only provide just simple average torque.

Married together with our powerful signal processing and interfacing technology, it is now even possible to analyse individual component performance and condition, even so far as being able to detect wear of gearbox components down to actual teeth within it.

Contact our sales team for further information on our torque sensors and transducers on how they can aid the testing of drivelines.

Contact Info
Tel: +44 (0) 1983 28 28 34
Contact Form
Email: web@datum-electronics.co.uk

Tractor & Machinery features Datum's Series 420 PTO Power Monitoring System

09/05/2008 10:20:38

The Datum Electronics Series 420 PTO (Power Take Off) Shaft Torque and Power Monitoring System has been designed to log the torque, shaft speed and transmitted power accurately when testing new systems driven from all standard PTO Shafts.

The tractor's PTO or stub shaft, transfers power from the tractor to the PTO-driven machine or implement. Power transfer is accomplished by connecting a drive shaft from the machinery to the tractor's PTO stub shaft. Common examples include elevators, grain augers and silage blowers.

The PTO and drive shaft rotates at 540 rpm (9 times/sec.) or 1,000 rpm (16.6 times/sec.) when operating at full recommended speed. At all speeds, they rotate in proportion to the speed of the tractor engine.

Working in Partnership with Bicton College

Bicton College are an Agricultural College in the UK, who worked on a project to restore a Massey Ferguson 35 with 23C four-cylinder engine. As part of the restoration process and procedure, the purchased a Datum Series 420 PTO System in order to gain an accurate level of output from the engine. As you can see the display meter supplied with the PTO system displays accurately the torque and speed output of the engine and calculates the power output.

Engine wear over time will have a impact on power output of an engine, in this instance the power output has been reduce from 34HP when it was first manufactured to 22HP. This can be attributed to engine wear, and other faults which happen typically over time.

Benefits of Series 420 PTO System

There are a number of benefits of using the Datum Series 420 PTO System. Efficient measurement and monitoring of this power can be a useful tool in research and analysis into the performance of a tractor transmission system highlighting efficiency savings measurement and organize.
Suitable for field testing or within a test environment, the strong, robust and rugged design of the PTO system can adapt to almost any environment, providing effective power measurement and monitoring of a typical Power Take Off System (PTO). Capabilities of the Series 420 PTO System includes:

Power Monitoring
Robust Design for use in field applications
Environmental Protection IP65
Easy Installation
Accurate Results
Direct USB interface into PC or laptop

Contact For Full details of the Series 420 PTO System

For full details of the Datum Electronics Series 420 (PTO) Shaft Torque and Power Monitoring System contact our sales team.

Tel: +44 (0) 1983 28 28 34
Contact Form
Email: web@datum-electronics.co.uk

Advanced Electronics Apprentice Required

22/05/2008 16:45:42

Electronics Technician Apprentice with Datum Electronics Limited – East Cowes

An exciting opportunity exists to work within our professional electronics team, learning about a wide range of engineering skills including CAD, electronic assembly, unit and system test and strain gauging.

Working with SETA, we have designed an Apprenticeship programme that combines many varied practical skills, NVQ work and Technical Certificate qualifications and hopefully working towards NVQ 3 and a BTEC.

Qualifications

To join this exciting Apprenticeship programme, you’ll need to pass tests and an interview. You should have minimum qualifications of 5 C grades at GCSE, including English, Maths and Science (or equivalent). Predicted grades will be considered subject to actual grades achieved.

Skills Required

You will have good attention to detail and the organisational ability to keep up with your NVQ qualification and college work. We work hard as team and reap the rewards of that hard work – we expect the successful applicant to do the same.

Training

Although the job is based in East Cowes, part of the training will take place at SETA in Southampton, so candidates must be prepared to travel regularly.

Timetable

Closing date for applicants is:      Saturday 7 June 2008
Interviews will start from:            June 2008
Start Date will be:                        September 2008
Apprentice will last for:                3 years finishing in 2011
Application Reference:                 8GE11950

Applications

To apply for the above vacancy, please visit www.apprenticeshipsonline.org

For further details on the above, please contact
MARK GLADDIS
Operations Co-ordinator,
Datum Electronics

Tel: (01983) 28 28 34
Email: mark.gladdis@datum-electronics.co.uk

Fangle News Rss Feed

Datum Electronics Development Website Goes Live

Datum Launch New Website

Accurate Power Measurement from your PTO tractor driveshaft

Major New Torque Calibration Facility

Calibration up to 200,000Nm

Technical

Manufacture of Torque Sensors

More Information....

Underwater Torque Transducer proves the delivered power of model Turbine

Slip ring replacement transducers now available

Datum Electronics can provide direct replacements for Slip ring based full bridge strain gauge output transducers with NO NEED to replace your current instrumentation!!!

Torque Sensor Measuring up to 200kNm

Datum Electronics - Consultancy Group for Torque Measurement

Consultancy Group

Network Load Cell Amplifiers with USB or RS485 Interface

Torque Transducers

Unique, Genuine and Reliable non-contact technology in the Series 420 rotary torque transducers from Datum Electronics.

M420 Torque Transducers

FF420 Torque Transducers

RS420 Torque Transducers

Series 430 Torque Trials Kit

Accurate Power & Torque Measurement

Long-Lasting Battery

Up to 50 hours continuous Usage

The Trials System

Data Analysis

Installation of Trials Kit

Experts in Torque Measurement

What is a Torque Transducer?

Definition of a Strain Gauge

Torque Transducers – Measurement Defined

Series 420 In-built speed sensor

Torque Transducer Specifications

Torque Measurement Specialsts on Rotating Machinery

Torque Transducer Developments

Specialist Torque Measurements - Dynamics, Ripple and Transient Events

(I) To monitor the wear characteristics and life, of gear teeth

(II) To test the energy transmitted through a gearbox at specific frequency bands

Datum Electronics Solution

(III) To measure torque underwater on a shaft, with, both radial and lateral oscillation

Significant Improvements in mixing process control

Accurate & Reliable Measurement for Mixers

Flexible options for data output

Wide range of industrial uses

Distributors & re-sellers required for torque and sensing equipment

Distributor Network

Products

Testing Components of Drive Trains

United States Patent: 20070240517

Testing Differential Gear Assembly

Noise, Vibration & Harshness (NVH) Testing

Datum RS420 Torque Sensor - Drive train torque measurement

RS420 Torque Transducer - Benefits

RS420 Analysis Options

Contact InfoTel: +44 (0) 1983 28 28 34Contact FormEmail: web@datum-electronics.co.uk

Drive Trains - Analysis & Control with Datum Electronics

RS420 Torque Sensor

High Data Sampling

More than just average torque measurement

Contact InfoTel: +44 (0) 1983 28 28 34Contact FormEmail: web@datum-electronics.co.uk

Tractor & Machinery features Datum's Series 420 PTO Power Monitoring System

Working in Partnership with Bicton College

Benefits of Series 420 PTO System

Contact For Full details of the Series 420 PTO System

Advanced Electronics Apprentice Required

Electronics Technician Apprentice with Datum Electronics Limited – East Cowes

Qualifications

Skills Required

Training

Timetable

Applications

Contact Info
Tel: +44 (0) 1983 28 28 34
Contact Form
Email: web@datum-electronics.co.uk

Contact Info
Tel: +44 (0) 1983 28 28 34
Contact Form
Email: web@datum-electronics.co.uk