Telemetry System

Telemetry System DT-221T/DT-281R

This telemeter system for dynamic measurement was developed to measure strain on objects that are difficult to measure by wire, such as rotating or moving objects. The system consists of a strain measurement transmitter DT-221T and a receiver DT-281R. The 2.4GHz band advanced low-power data communication system is effective for measurement of large objects such as large machine tools or objects with a large moving range where the distance between transmitter and receiver is large.

Telemetry System DT-221T/DT-281R
Features
  • Uses 2.4GHz band for wireless bandwidth
  • High-speed sampling at 10 kHz (100 μs)

DT-221T(Transmitter)

  • Strain voltage output is pre-calibrated and requires no calibration
  • Transmitter has built-in antenna
  • Easy wiring with unique terminal block

DT-281R(Receiver)

  • Voltage output range switchable among ±5000, ±10000, and ±25000 x 10-6 strain
  • Voltage output is pre-calibrated, no calibration required

  • Specifications
    Type DT-221T (Transmitter)
    Measurement object Strain gauge, strain gage transducers
    Number of measuring point 1point
    Applicable Gauge Resistance 120 to 1000Ω (4G bridge)
    Bridge voltage 2.0V±8%
    Measuring range ±25000 x 10-6 strain (including initial unbalance)
    Resolution 1×10－6 strain
    Measuring accuracy ±0.2％FS
    Sampling frequency 100μs (10kHz)
    Zero stability ±0.8×10－6 strain /℃
    Sensitivity stability ±0.01%/FS/℃
    Wireless specification 2.4GHz Band Advanced Small Power Data Communication System
    Number of Channels 16
    Antenna built-in
    Display and Operation Wireless channel switching switch
    External dimensions 36(W)×12.5(H)×22.5(D)mm
    Weight Approx. 17g

     

    Type DT-281R (Receiver)
    Wireless specification 2.4GHz Band Advanced Small Power Data Communication System
    Number of Channels 16
    Display and Operation Reception signal strength LED/Transmitter battery voltage LED/
    Radio channel selector switch
    Voltage output Selected by ±5V strain output range selector switch
    ±25000×10-6 strain
    ±10000×10-6 strain
    ±5000×10-6 strain
    Calibration output ±5V
    low-pass filter 100Hz, 500Hz, PASS(1kHz), (-3dB±1dB)
    External dimensions 48(W)×23.5(H)×100(D)mm　(excluding protruding parts)
    Weight Approx.140g
    Power DC 9 to 16V

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Telemeter transmitter for shaft DT-223T

This product is a telemeter transmitter for shafts using a 2.4GHz low-power radio module.
Combined with the telemeter system receiver DT-281R-1, a telemeter system for drive shafts can be easily constructed. The structure allows easy installation by clamping the drive shaft, so it can be used for a variety of applications other than torque measurement.
The 2.4GHz radio bandwidth allows measurement not only when the receiving antenna can be installed near the transmitter, but also when the distance between the transmitter and receiver is long, such as when the object is large, such as a large vehicle, or when the object has a wide range of motion.

dt-223t
Features
  • Easy installation by clamping the drive shaft
  • 27mm shaft length enables installation in narrow sections (smaller than the previous model)
  • Powered by a single CR-type cylindrical lithium battery (CR2) for easy replacement on site
  • Uses 2.4GHz wireless bandwidth
  • Built-in transmitting antenna
  • Body mounting hole is Φ40 and can be inserted with spacers, etc., to allow mounting on a wide variety of shaft diameters
  • Strain values are transmitted as digital values. Strain values are pre-calibrated, so calibration is not required
  • High-speed sampling rate of 200μs (5kHz)
  • Full scale ±25000 x 10-6 strain DT-223T (transmitter)
  • Can be used by simply connecting the bridge to a screw terminal block (no solder required)
  • Telemeter system DT-281R-1 (receiver)

  • Specifications
    Type DT-223T (Transmitter)
    Strain measurement part Number of measuring point 1point
    Applicable Gauge Resistance 120 to 1000Ω (4G bridge)
    Bridge voltage 2.0V±8%
    Measuring range ±25000 x 10-6 strain (including initial unbalance)
    Measuring accuracy ±0.2％FS
    Sampling frequency 5kHz(200μs)
    Response frequency DC to 1kHz(-3dB±1dB)
    Resolution 1×10-6strain
    Stability Zero point ±0.8×10-6 strain /℃
    Stability Sensitivity ±0.01%/FS/℃
    Input terminal Screw connection terminal block (Applicable wire size max. 0.5 mm2)
    Supply voltage measurement section Number of measuring point 1 point
    Measuring range 1.3 to 3.6V
    Radio part Wireless specification 2.4GHz Band Advanced Small Power Data Communication System
    Number of wireless channels 16 channels (paired with receiver radio channels)
    Antenna built-in
    Battery power input section Power 1 CR-type cylindrical lithium battery (CR2)
    Continuous use time Approx. 4 hours
    Comprehensive Operating temperature and humidity range -30 to +70°C, 85%RH or less (excluding condensation, not applicable to batteries)
    Vibration resistance 100m/s2 3-direction
    External dimensions 82(W)×74(H)×27(D) (excluding protruding parts)
    Housing Material Resin
    Weight Approx. 130g
    Type DT-281R-1 (Receiver)
    Wireless specification 2.4GHz Band Advanced Small Power Data Communication System
    Number of Channels 16
    Display and Operation Reception signal strength LED/Transmitter battery voltage LED/
    Radio channel selector switch
    Voltage output range Selected by ±5V strain output range selector switch
    ±25000×10-6 strain
    ±10000×10-6 strain
    ±5000×10-6 strain
    Low-pass filter 100Hz, 500Hz, PASS(1kHz)(-3dB±1dB)
    External dimensions 48(W)×23.5(H)×100(D)mm　　(excluding protruding parts)
    Weight Approx. 140g
    Power DC 9 to 16V 

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