Description
Dwyer SERIES 657 RELATIVE HUMIDITY/TEMPERATURE TRANSMITTER
Dual Channel Design for Simultaneous 4-20 mA Output Signals
The Series 657 Relative Humidity/Temperature Transmitters provide two 4-20 mA channels to produce separate output signals for both relative humidity and temperature. These devices deliver ±2% accuracy for humidity and ±1°F for temperature measurements. Stainless steel probe can be easily mounted to most ductwork using either of the two optional kits below.
Features:
- Polymer film humidity and thin film RTD temperature sensors offer highly reliable and stable measurements
- Remote mount housing offers installation flexibility (657-1)
- Rugged die-cast aluminum housing is great for industrial applications (657C-1)
Applications:
- Cleanroom monitoring
- HVAC/building control monitoring
Specifications:
- Service: Dry clean air
- Range: Relative Humidity: 0-100%; Temperature: 32 to 212°F (0 to 100°C)
- Accuracy: Relative Humidity: ±2% (10-90% RH), ±3% (0-10% and 90-100% RH); Temperature: ±1°F (0.5°C)
- Temperature Limit: 32 to 140°F (0 to 60°C)
- Pressure Limits: 1 psi (.07 bar)
- Compensated Temperature Range: 32 to 140°F (0 to 60°C)
- Power Requirements: 10-35 VDC
- Output Signal:2 channels each 4-20 mA
- Loop powered on RH channel
- Electrical Connections: 4 screw type terminal
- Mounting Orientation: Mount in any position
- Probe: 657-1: Stainless steel 5/16″ x 10″(0.8 x 25.4 cm); 657C-1: 5/16″ x 9-1/10″ (0.8 x 23.1 cm)
- Weight:657-1: 5.5 oz (156 g); 657C-1: 10 oz (284 g).
Models:
- 657-1 Relative humidity/temperature transmitter.
- 657C-1 Relative humidity/temperature transmitter.
