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Sensor Technology
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  • Offer Profile
  • For over 40 years Sensor Technology has researched and developed solutions for customers' torque and load measurement problems, developing its own unique technologies for the instrumentation, test and OEM markets worldwide and supported by a global network of distributors. The TorqSense rotary torque sensors and LoadSense wireless load sensors offer accurate, affordable, market leading products across the whole range of industrial applications. The HeliNav Wireless LoadMaster provides accurate measurement of underslung loads for the helicopter industry.
Product Portfolio
  • Rotary Torque Transducers & Wireless Load Sensors

  • For over 40 years Sensor Technology has researched and developed solutions for customers' torque and load measurement problems, developing its own unique technologies for the instrumentation, test and OEM markets worldwide and supported by a global network of distributors. The TorqSense rotary torque sensors and LoadSense wireless load sensors offer accurate, affordable, market leading products across the whole range of industrial applications. The HeliNav Wireless LoadMaster provides accurate measurement of underslung loads for the helicopter industry.
      • TorqSense

      • We offer a range of rotary torque sensors and torque transducers to suit a variety of industrial applications, our standard range of sensors can measure torque ranges from 10mNm up to 13000Nm.
          • RWT410/420 Series Torque Sensors

          • TorqSense RWT410/420 torque sensors replace the RWT310/320 series and feature all new electronics that have produced significant performance gains in resolution, frequency response, reduced sensor current consumption and faster digital data throughput.
            Transducer overload has also been increased to 300%.

            TorqSense Digital RWT410/420 Series torque transducers with integral electronics are available in three different body sizes for torque ranges up to 13000Nm. The series offers a cost effective, non-contact digital rotary torque measurement solution, using TorqSense Surface Acoustic Wave technology, suitable for torque monitoring, testing or controlling drive mechanisms. TorqSense RWT410/420 series transducers and their technology are particularly appropriate for OEM applications.

            Key Benefits:
            • Minimal shaft length - High shaft stiffness
            • Low inertia - High Speed capability because electronics are not fixed on to shaft
            • Non-contact/brushless measurement - simple RF couple for power/signal transmission
            • High bandwidth 10kHz
            • 300% mechanical safe overload
            • High accuracy (0.25%) and resolution (0.02%)
            • Excellent noise immunity
            • Integral digital electronics
            • Operates both statically and dynamically - Clockwise and anti-clockwise
            • Any full scale torque can be specified within the standard range: 1Nm through to 13000Nm
            • Sensors to monitor shaft temperature for better compensation and accuracy
            • LED Status light
            • Lifetime Warranty
          • RWT430/440 Series Torque Transducers

          • The TorqSense RWT430/440 torque sensors replace the RWT330/340 series and feature all new electronics that have produced significant performance gains in resolution, frequency response, reduced sensor current consumption and faster digital data throughput.
            Transducer overload has also been increased to 300%.

            The digital TorqSense RWT430 and RWT440 Series use the latest and same non-contact TorqSense technology as used in the RWT410/420 Series in three different body sizes for torque ranges from 1Nm to 13000Nm, with above 13000Nm on request. The only difference for this Series is that it may be more appropriate for some applications to have the sensor unit separate from the electronics unit due to space and/or environmental limitations.

            The series offers a cost effective, non-contact digital rotary torque measurement solution, using TorqSense Surface Acoustic Wave technology, suitable for torque monitoring, testing or controlling drive mechanisms and particularly appropriate for OEM applications.

            Key Benefits:
            • Minimal shaft length - High shaft stiffness
            • Low inertia - High Speed capability because electronics are not fixed on to shaft
            • Non-contact/brushless measurement - simple RF couple for power/signal transmission
            • High bandwidth
            • 300% mechanical safe overload
            • High accuracy (0.25%) and resolution (0.02%)
            • Excellent noise immunity
            • Seperate digital electronics
            • Operates both statically and dynamically - Clockwise and anti-clockwise
            • Any full scale torque can be specified within the standard range: 1Nm through to
            • 13000Nm
            • Lifetime Warranty
          • RWT450/460 Series Pulley/Sprocket Torque Sensor

          • The TorqSense RWT450/460 torque transducers replaces the RWT350/360 series and feature all new electronics that have produced significant performance gains in resolution, frequency response, reduced sensor current consumption and faster digital data throughput. Transducer overload has also been increased to 300%.

            TorqSense Digital RWT450 & 460 series pulley/sprocket transducers are suitable for torque monitoring and process control on any belt / chain driven machinery. They offer separate electronics and sensor either with fixed outputs (RWT450 Series) or user selectable outputs (RWT460 Series). USB and RS232 outputs are also available for direct PC interface.

            Key Benefits:
            • Direct replacement for standard pulley / sprocket
            • Low inertia - High Speed capability because electronics are not fixed on to shaft
            • Non-contact/brushless measurement - simple RF couple for power/signal transmission
            • High bandwidth 10kHz
            • 300% mechanical safe overload
            • High accuracy and resolution
            • Excellent noise immunity
            • Seperate digital electronics
            • Operates both statically and dynamically - Clockwise and anti-clockwise
            • Any full scale torque can be specified within the standard range:
            • 100Nm through to 10000Nm
            • Lifetime Warranty
          • ORT230/240 Optical Torque Transducers

          • The ORT 230/240 Transducer offers an ideal means for precise dynamic measurement of rotary and static torque less than 100Nm and for bandwidths of up to 50Khz.

            The new TorqSense ORT 230/240 torque sensors replace the E200 ORT series and feature all new electronics that have produced significant performance gains in resolution, frequency response, reduced sensor current consumption and faster digital data throughput.

            Key Benefits:
            • Low inertia – High Speed capability because electronics are not fixed onto shaft
            • Non contact/brushless measurement
            • High Bandwidth
            • 200% safe mechanical overload
            • Excellent noise immunity
            • Separate digital electronics
            • Operates both statically and dynamically
            • - clockwise/anti-clockwise
            • Any full scale torque can be specified within standard range: 10mNm through to 100Nm
            • Lifetime warranty
          • SIT 105/110/120 Series Strain Gauge Torque Sensors

          • The SIT 105/110/120 strain gauge reaction transducers are designed for operation in any industrial environment.

            Models are available in sizes ranging from 50Nm to 5000Nm, offering outputs from mV/V outputs, to ratiometric voltage outputs, to digital data connection via RS232 or USB.

            An option of a bench mount housing is available for torque wrench test and calibration.

            The SIT 105/110/120 torque transducers use modern wire foil strain gauge technology with the latest high performance stainless steel shafts

            SIT 105 transducers offer:
            • Calibrated 1mV/V output

            SIT 110 transducers offer:

            • Scaled ratiometric voltage output, 2.5V zero, 4.5V CW FSD 0.5V ACW FSD

            SIT 120 transducers offer:
            • Ratiometric voltage output as above
            • RS232 output for connection to PC

            An extension module for the SIT 120 series transducers also offers:
            • USB digital output
            • User scalable voltage or current outputs, ±1V to ±10V, 4-20mA bipolar and unipolar
          • Transducer Display ETD

          • The Transducer Display ETD is a readout suitable for all RWT transducers. Although it is primarily used to display torque and peak torque, it can also display speed and power, provide access to the analog outputs from the transducer and connect the transducer to a PC for use with TorqView and the Transducer Control Program.

            Key Benefits:

            • Displays torque, peak torque, speed* or power* in the units specified within the transducer
            • Automatically detects and displays the model, range, serial no. and calibration due date of the transducer
            • Provides auto reset of peak torque values
            • Provides power to the transducer in place of the standard power supply unit
            • Provides access to analog torque outputs and pulse speed* output
            • Provides USB output if used with RWT420/440 series with USB option fitted
            • Displays warnings and high temperature if appropriate
            • * Provided RWT transducer has speed option fitted and enabled

            Technical Data:
            Display LCD 20 x 4 STN BLUE
            Display update rate 4Hz
            Overall size 220w x 290d x 100h (Aluminium enclosure
            Weight 1.76 kg
            Operating temperature range -10°C -50°C
            Power supply 90-250v AC, 50-60Hz, 10W, IEC connector
            Channel 1 analog output As specified by transducer
            Channel 2 analog output As specified by transducer
            Pulse RPM Out TTL compatible
            Serial output USB Type B
            Connection to transducer Cable ACC-04
          • Bluetooth Interface Module

          • The optional Bluetooth interface box bring wireless flexibility to your transducers. The box simply plugs into the 15 way 'D' digital lead connector, it also allows the transducer to be powered through the interface as well as providing a USB output.

            Our android app will enable you to view the current Torque, Speed, and temperature, as well as peak values. It will also allow you to set filters and view the current configuration of the sensor. As the Interface also has a USB output it lets you connect to your PC at the same time, this allows you to run a full version of our TorqView software, for example to record at full speed while using your android device as a monitor.

            Using a mobile device with Bluetooth and our software means you can quickly look at the transducer data without having to set up a computer and cables giving you fast access to the information when you need it.

            Key Benefits:
            • Connect via USB and Bluetooth at the same time to use TorqView full, as well as the app as a monitor at the same time
            • Wireless so computer / tablet can be away from the transducer
            • Android app for mobile devices is available
            • Provides power to the transducer
            • One module solution
            • Wall/bench mountable
          • TorqView Advanced Torque Monitoring Software

          • TorqView is an easy to use advanced torque monitoring software application available to operate in conjunction with the RWT420/440/460 and ORT230/240 Series Transducers and any of the E102, E202 and E302 series Transducer Display Interfaces to provide a flexible display, real time plotting and data recording facility.

            Benefits:
            • Simple installation using serial port or USB
            • Ease of operation (user friendly, a variety of user interface settings such as scales, units, etc.)
            • 3 types of display: dials, digital bars and chart graph
            • Wide choice of displayed units (SI, FPS, and MKS)
            • Displays torque, RPM, power and temperature
            • Data recording facility, real time plotting
            • Output text files compatible with Matlab, Excel
            • Suitable for TorqSense® RWT420/440/460, ORT230/240 and SIT120 series transducers. Also suitable for using with obsolete equipment including the RWT320/340/360 series, E302 Display Interfaces, E200 ORT Series Transducers using E202 Transducer Display Interfaces, E100 SBT and E100 SIT Series Transducers using E102 Transducer Display Interfaces
            • LabVIEW VIs available for users to design own process control applications
            • DLLs available for users to write own custom software
            • User configurable settings
        • LoadSense

        • We are manufacturers of LoadSense Wireless Load Cells and transducers ranging from 1 to 25 tonnes.
            • Wireless Load Sensor

            • The wireless Load Sensor is a strain gauge based stainless steel tension type sensor. It has the capability of wirelessly transmitting its data to one of our compatible readouts and displays or recording its data locally. Its inbuilt 32MBit memory can hold up to 280 hours of data which can then be downloaded to a PC via its USB cable. The Load Sensor transmits using the worldwide licence free frequency of 2.4GHz on two built in antennas.

              The Load Sensor is used with our HandHeld Receiver which can read several devices at the same time, (see data sheet WLS3626R for more details), and/or our stand alone Receiver Interface which is used to output the data via RS232/RS422, (see data sheet WLS3627R for more details)

              Key Benefits:
              • Wireless, so easy to install and remove between installations
              • Transmits data up to a distance of 100m
              • Transmits data at up to 10 times a second
              • Internal Memory for up to 280 hours of data
              • 11V to 28V external supply chargeable
              • Connect to PC via USB
              • PC software for customer settings
              • Flexible automatic shutdown to conserve battery
              • Dual ruggedised internal antennas
            • Handheld Receiver

            • The wireless receiver is used in conjunction with the wireless Load Sensor. It provides the user with an easy way to receive and output data from the Load Sensor. Enclosed in a hardwearing aluminium box the receiver is suitable to be installed into environments where it may be subjected to harsh conditions.

              The receiver is easy to install as it only requires DC power to be supplied to the unit. An SMA connector allows the use of an external antenna.

              The wireless LoadSense HandHeld Receiver Display is used in conjunction with the wireless Load Sensor. It provides the user with an easy way to receive and view data from the Load Sensor.

              Up to 9 Load Sensors can be selected from the HandHeld Receiver and individually displayed. These Load Sensors can be named by plugging the Load Sensor into a PC via USB and using the Load Sensor software.
              They can then be easily distinguished on the display, which will show the current name of the Load Sensor being read.

              The display shows the name of the current Load Sensor, the load, battery status of readout and Load Sensor and signal strength. By using the menu tree on the readout the user can select which Load Sensor to read, what units to be displayed, tare the data, display peak value and many more functions.

              A 9 way D connector is provided to output data via RS232 / RS422 and a USB mini B to charge the battery and output data to a PC.

              Key Benefits:
              • Reads multiple Load Sensors
              • Receives data up to a distance of 100m
              • Receives data at 10 times a second
              • Connect to PC via USB for user setup
              • Output data via RS232 / RS422 / USB
              • Ruggedized rubber case with back stand
              • Long life rechargeable battery powered
            • Load Sensor Cabin Display

            • The LoadSense Cabin Display is a small, lightweight, cabin / window mounted unit which is used in conjunction with our LoadSense Wireless Load Sensors to display the reading from the load sensor. Our range of Load Sensors up to 25 tonnes are shown in datasheet WLS3625R.

              Using the 2.4GHz licence free band to receive the Load Sensor signal, it can display the load value in several views which are user selectable. It also allows the user to tare off any equipment weight to display just the load value of the cargo.

              The system can operate from its rechargeable battery and does not need to be hard wired, enabling the equipment to be easily transferred between installations. The display can be operated and charged from a 28V supply

              Key Benefits:
              • Reflective, sunlight readable LCD display
              • Optional analog output for cirscale meters
              • External antenna
              • Units displayed: Tonne, Kg , lbs
              • RAM® 1" ball mount. Base options on request
              • Multiple display views. Digital, Analog Bar
              • Tare function to zero out weight of equipment
            • Receiver Interface

            • The wireless receiver is used in conjunction with the wireless Load Sensor. It provides the user with an easy way to receive and output data from the Load Sensor. Enclosed in a hardwearing aluminium box the receiver is suitable to be installed into environments where it may be subjected to harsh conditions.

              The receiver is easy to install as it only requires DC power to be supplied to the unit. An SMA connector allows the use of an external antenna.

              The receiver outputs a string of data from the Load Sensor which includes: Serial number, full scale, Load, Temperature, RSSI and battery voltage. The data is constantly outputted from the receiver straight from "power on" as long as the Load Sensor is in range. The output can be provided as either RS232, RS422, USB or Analog. This provides the functionality of being able to send the data over a longer distance if the receiver was to be in a remote location. The interface is suitable for applications where no user interaction is needed and data is fed into a data logger or remote display. An internal memory with real time clock is available for stand alone applications which may be interrogated from a PC.

              Key Benefits:
              • Small Footprint (133mm x 67mm x 43.5mm)
              • Receives data up to a distance of 100M
              • Receives data at 10 times a second
              • Minimal startup time
              • Very simple installation
              • Operates on 2.4GHz licence free band
          • HeliNav

          • HeliNav LoadMaster is an intelligent wireless helicopter load sensor with inclinometer and accelerometer capabilities so that it can be used to measure large underslung loads.
            Load sensors are available in a range of sizes from 1 to 10 tonnes.

            HeliNav TrackMaster gives pilots an easy to use and accurate system for line guidance. It also automatically records all data for post-flight downloading so that detailed analysis of the flight and operational performance can be completed for accurate billing, maintenance scheduling, etc.

            The HeliNav LoadMaster and TrackMaster systems can be used separately or in combination, giving helicopter operators complete weight and distance information for post flight analysis and billing.
              • Wireless Load Sensor

              • The wireless HeliNav LoadMaster Load Sensor is a strain gauge based stainless steel tension type sensor. It has the capability of wirelessly transmitting its data to one of our compatible readouts and displays or recording its data internally. Its inbuilt 32MBit memory can hold up to 280 hours of data which can then be downloaded to a PC via its USB cable. The Load Sensor works in the worldwide harmonized band of 2.4 GHz using two built-in antennas so does not require a licence to operate and uses advanced technologies to enable data to be sent and received error free, these include, forward error correcting and data whitening.

                The HeliNav LoadMaster Load Sensor is also compatible with our Handheld Receiver which can read several devices at the same time and our stand alone HeliNav LoadMaster Receiver Interface which can be used to output the data via RS232/RS422 or if used with our 7" touchscreen display it can be used for very advanced features using our software for GPS track guidance as well as more advanced load capabilities. The Load Sensor display (HLM3751R) is able to display a simple load value in multiple formats, which are user selectable, or HeliNav TrackMaster helicopter guidance & GPS system which is ideal for heavy duty lifting applications for line track guidance.

                Key Benefits:
              • Load Sensor Handheld Receiver

              • The wireless HeliNav LoadMaster Handheld Receiver is used in conjunction with the HeliNav LoadMaster wireless Load Sensor. It provides the user with an easy way to receive and view data from the Load Sensor.

                Up to 9 HeliNav LoadMaster Load Sensors can be selected from the Handheld Receiver and individually displayed. These Load Sensors can be individually named by plugging the Load Sensor into a PC via USB and using the Load Sensor software. They can then be easily distinguished on the display, which will show the name of the Load Sensor currently being read.

                The display shows the name of the current Load Sensor, the load, battery status of readout and Load Sensor and signal strength. By using the menu tree on the readout the user can select which Load Sensor to read, what units to be displayed, tare the data, display peak value and many more functions.

                A 9 way D connector is provided to output data via RS232/RS422 and a USB mini B to charge the battery and output data to a PC.

                Key Benefits:
                • Reads multiple Load Sensors
                • Receives data up to a distance of 100m
                • Receives data at 10 times a second
                • Connect to PC via USB for user setup
                • Output data via RS232 / RS422 / USB
                • Ruggedized rubber case with back stand
                • Long life battery powered
              • Load Sensor Cockpit Display

              • The HeliNav LoadMaster Cockpit Display is a small, lightweight, cockpit / window mounted unit which is used in conjunction with our HeliNav LoadMaster Load Sensors to show the current load on the screen. Our range of Load Sensors up to 10 tons are shown in datasheet HLM3599R.

                Using the 2.4GHz licence free band to receive the Load Sensor signal, it can display the load value in several views which are user selectable. It also allows the user to tare off any equipment weight to display just the load value of the cargo.

                The system can operate from its rechargeable battery and does not need to be hard wired, enabling the equipment to be easily transferred between aircraft. The display can be operated and charged from a 28V supply.

                Key Benefits:
                • Reflective, sunlight readable LCD display
                • Optional analog output for cirscale meters
                • RAM® 1" ball mount. Base options on request
                • Multiple display views. Digital, Analog Bar
                • Tare function to zero out weight of equipment
                • Units displayed: Tonne, Ton, Kg, lbs
                • External antenna
              • Load Sensor Receiver Interface

              • The wireless HeliNav LoadMaster Receiver Interface is used in conjunction with the wireless Load Sensor. It provides the user with an easy way to receive and output data from the Load Sensor. Enclosed in a hardwearing aluminium box the receiver is suitable to be installed into environments where it may be subjected to harsh conditions.

                The receiver is easy to install as it only requires DC power to be supplied to the unit. An SMA connector allows the use of an external antenna.

                The receiver outputs a string of data from the Load Sensor which includes: Serial number, full scale, Load, Temperature, RSSI and battery voltage. The data is constantly outputted from the receiver straight from "power on" as long as the Load Sensor is in range. The output can be provided as either RS232, RS422, USB or Analog. The interface is suitable for applications where no user interaction is needed and data is fed into a third party data logger or remote display.

                Key Benefits:
                • Small Footprint (133mm x 67mm x 43.5mm)
                • Receives data up to a distance of 100m
                • Receives data at 10 times a second
                • Analog or digital data outputs
                • Minimal startup time
                • Very simple installation
                • Operates on 2.4GHz licence free band
              • Guidance System

              • HeliNav TrackMaster has been designed to provide pilots an easy to use and accurate system for line guidance and recording data.

                The 7" sunlight readable touchscreen provides clear and accurate positional data for the pilot with an easy to navigate menu system. This system allows the importing of shape files for areas to spray, as well as drop points for lifting jobs.

                When used for spraying, the pilot can see exactly which area of the shape has been sprayed as the shape is filled in on screen.

                Once a job has been completed, the software allows the data to be exported in many geographic formats which include shape files and KML Google Map files, along with the positional data and amount lifted can also be reported and used for billing purposes.

                The software also allows for user customisation of units, colours, CRS (coordinate reference system) as well as many more.

                The HeliNav TrackMaster system is also compatible with the HeliNav LoadMaster Load Sensor, when used together it allows lifted weight and drops to be recorded to file for future billing purposes.

                Key Benefits:

                Accurate A-B line track guidance with user selectable spray widths
                Imports ESRI shape files & Google Earth KML
                Overlay spray lines onto shape file for visual confirmation
                Total spray area calculation, Hectars m2, acres
                No spray zones
                User selectable units: Tonne, Ton, Kg, lbs, kph, mph, knots, m/s
                Memory tares for zeroing out different equipment
                Output recorded data as ESRI shape file or Google KML file
                Records to file: date, time, load, location, spray on/off
                User configurable colour schemes and options
                Rental options available

                GPS:
                • External receiver update rate 10 times per second
                • Receives SBAS (Space Based Augmentation Signals) where available
              • Guidance Light Bar

              • HeliNav TrackMaster Guidance Light Bar can be used in addition to the HeliNav TrackMaster guidance and global positioning system. The light bar is designed to connect to the TrackMaster guidance system using a USB port.

                The light bar scaling is calibrated by the swath width that has been set in the TrackMaster software; e.g. for a 12 metre swath width, each LED indicates 1 metre; for a 24 metre swath, each LED indicates 2 metres.

                The two vertical LED's in the centre of the bar can be configured to change colour to indicate if the aircraft is inside the working area or not.

                The light bar will also allow the connection of external switches to control some of the TrackMaster inputs, e.g. Spray on/off, Track Change, Track Inc/Dec and Set A/B.

                Key Benefits:
                • Adjustable scales, dual scale capability
                • Notifies pilot that they are in the spray area
                • Powered via USB
                • Super bright, colour adjustable indicators
                • Opto isolated switch inputs for track change, spray on etc
                • Mounted by 1" RAM mount
            • Technology

                • How a Torque Sensor works

                • The technology for our 'TorqSense' RWT410/420, RWT430/440 and RWT450/460 Series Torque Transducers is based on the patented technology of measuring the resonant frequency change of 'Surface Acoustic Wave' (SAW) devices in a non-contact manner when strain is applied to a shaft to which the SAWs are fixed. The applied torque causes a deformation of the quartz substrate of the SAW device, which in turn causes a change in its resonant frequency. Essentially the SAWs act as 'frequency dependent' strain gauges.


                  The frequency signal measuring the resonant frequency is coupled via a non-contact RF rotating couple from the shaft to a fixed pick-up and it is the analysis of the difference in resonant frequencies between the two SAW devices, with electronic processing and calibration, that gives a precise indication of the torque transmitted by the shaft. SAW devices have a high immunity to magnetic fields allowing their use in motors, for example, where other analog technologies are susceptible to electronic interference and are not suitable.

                  The use of this patented measurement technique results in a transducer being able to sense torque bi-directional, with fast mechanical and electrical responses. As the method is non-contact it has also complete freedom from brushes or complex electronics, which are often found in traditional torque measurement systems.

                  In more detail...

                  In its simplest form, a SAW transducer consists of two interdigital arrays of thin metal electrodes deposited on a highly polished piezoelectric substrate such as quartz. The electrodes that comprise these arrays alternate polarities so that an RF signal of the proper frequency applied across them causes the surface of the crystal to expand and contract and this generates the surface wave. These interdigital electrodes are generally spaced at ½ or ¼ wavelength of the operating centre frequency. Since the surface wave or acoustic velocity is 10-5 of the speed of light, an acoustic wavelength is much smaller than its electromagnetic counterpart. For example, a signal at 100Mhz with a free space wavelength of three metres would have a corresponding acoustic wavelength of about 30 microns. This results in the SAW's unique ability to incorporate an incredible amount of signal processing or delay in a very small volume. As a result of this relationship, physical limitations exist at higher frequencies when the electrodes become too narrow to fabricate with standard photolithographic techniques and at lower frequencies when the devices become impractically large. Hence, at this time, SAW devices are most typically used from 10Mhz to about 3Ghz.

                  The operation of a SAW transducer for strain measurement depends on the choice of a suitable piezoelectric substrate, which can be attached to the material to be stressed. The stress results in a strain, which can be in tension or compression. The sensitive axis of the transducer is longitudinal in the direction of wave propagation. Strain will change the spacing of the interdigital electrodes and hence the operating frequency. For an excitation frequency of 500Mhz, 1000 µ-strain of tension will decrease the frequency by 500 kHz; conversely a compressive strain will increase the frequency by the same amount. To function as an oscillator, the element is used as amplifier feedback. The Q factor of the transducer is high - typically 104. Therefore, by meeting the phase and gain requirement, the circuit will oscillate with very high stability - typically one part in 109. From the technique described it is apparent that the output signal will be in the frequency domain. This has many advantages for a number of applications, particularly in variable speed electrical machines where RF signals cannot be easily contaminated by drive electronic noise.
                • Optical Technology

                • The technology for our Optical E200 ORT Series Torque Transducers is based on an extensively proven and developed measurement principle whereby two discs with segmented gratings are positioned on the shaft so that the opaque sectors on one disc partially obscure the clear sectors on the other. Light passes through the sectors and is detected by photovoltaic detectors. The intensity of light beams, which is constantly monitored, is modulated by the applied torque and produces an electrical output that is used to provide a precise indication of the torque transmitted by the shaft. The light intensity is automatically controlled within the transducer body by a monitor cell. Lamps used to provide the light source are selected to ensure they have a long life and high stability.

                  The use of this measurement technique results in a transducer being able to sense torque bi-directionally. Very high full-scale sensitivity can be achieved with fast electrical responses up to 50kHz and low inertia. As the measurement is non-contact it has also has complete freedom from brushes and complex electronics on the shaft, which are often found in traditional torque measurement systems.
                • LoadSense - How It Works

                • The wireless LoadSense load measurement sensor is a strain gauge stainless steel tension type sensor currently available in 1 Ton to 25 Ton ranges, having an overload capability of more than 150%. It has the capability of wirelessly transmitting its data to one of our compatible displays or data recorders. Data is transmitted 10 times per second in the worldwide licence free 2.4GHz frequency band, a pair of rugged inbuilt antennae ensure the sensor will not get damaged in harsh operating environments. A transmission distance of 100 metres is achievable.

                  The load sensor contains an internal Lithium Ion rechargeable battery. The battery can be charged from a PC USB port or from an external 11-28 VDC power supply. Depending on transmission data rates and configuration options selected, over 1000 hours battery life can be achieved. A scheduler allows the user to configure the load sensor to automatically switch on at a certain time of day then return to standby later in the day. This is useful if the sensor is to be attached in a location where it is inconvenient to keep switching on and off every day before and after use, this also allows the user to preserve battery life even further.

                  The load sensor also contains an inbuilt 32Mbit memory for recording load data locally when an external display or data recorder is impractical. The memory can hold up to 280 hours of data which can then be downloaded to a PC via its USB cable.