Dynamic Strainmeters
Telemetry System
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.
Features:
- Uses 2.4GHz band for wireless bandwidth
- High-speed sampling at 10 kHz (100 μs)
- Strain voltage output is pre-calibrated and requires no calibration
- Transmitter has built-in antenna
- Easy wiring with unique terminal block
- 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) |
|---|---|
| Measuring object | Strain gauge, strain gage transducers |
| Number of measuring point | 1 point |
| 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 |
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.
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
- Uses 2.4GHz wireless bandwidth
- 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 | |