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Frictional Torque Sensor System FGDH-2A (digital telemetry type)

MLA-NA
Torque sensor system measures torque on the drive shaft of a car. Frictional strain gauges are used as sensing elements, and the installation is completed by clamping the torque sensor system onto an existing shaft and securing it with a screw. There is no need of detaching the shaft, bonding, nor wiring strain gauges for the installation. The system is applicable to shafts having a diameter of 20mm to 30mm using spacers together, which are available as options. A digital telemetry transmitter is built in the sensor, and measured data are transmitted to an exclusive receiver DT-041R-1 by wireless and output as analog signals. For wireless transmission, 315MHz band extremely low power radio wave is used.


Specifications

Type FGDH-2A
Applicable shaft diameter Ø20~30mm
Capacity Depends on the diameter (outer and inner), material, surface roughness and surface treatment of the shaft (*1)
Output Depends on the diameter (outer and inner), material, surface roughness and surface treatment of the shaft (*1)
Non-linearity 1%RO
Allowable temperature -20~+60°C (no dew condensation)
Sampling frequency 10kHz
Frequency response Approx. 1.1kHz
Carrier frequency 315~321MHz
Number of wireless channels 4
Dimensions Ø52×50mm
Weight Approx. 85g (excluding spacer)
Protection rating Equivalent to IP51
Continuous operating time Approx. 8 hours
Power source Lithium secondary battery
Accessory USB charger
*1:The sensor may not be applicable depending on the material, surface roughness and/or surface treatment of the shaft. Please contact TML or your local representative.
[Calibration example]
Torque: 500N·m
Output: 2500 mV (equivalent to 8000×10-6 strain) (*2)
Non-linearity: 1%RO (at 8000×10-6 strain output)
2 welds/sec. at 50 watt sec.
Conditions of test specimen
1. Diameter: 20mm
2. Material: SNCM439
3. Elastic Modulus: 210000 N/mm2 (test result by TML)
4. Poisson's Ratio: 0.29 (test result by TML)
5. Surface roughness: Ra 3.2
6. Hardness: HRC 38
*2:within ±16000×10-6 strain including initial unbalance of ±2000×10-6 strain

Features

  • Torque measurement system for evaluation test of running performance.
  • No need of bonding due to the use of frictional strain gauge
  • Digital data communications system enables noise-resistive measurement without wiring works
  • Easy attachment to drive shaft and speedy measurement
  • Applicable to drive shafts of different diameters by exchanging the spacer (ø20~30mm)
  • Frequency response of 1.1kHz
  • Equipping chargeable battery

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