The Model 657-1 Transmitter provides two 4 - 20 mA channels to produce separate output signals for both relative humidity and temperature. This inexpensive device delivers ± 2% accuracy for humidity and ± 3% for temperature measurements. The sensor employed in the 657-1 features a state-of-the-art integrated polymer film humidity sensor and a thin-film platinum temperature sensor to assure high reliability and rock-solid stability over years of continuous service. Stainless steel probe measures 5/16" x 10" (0.8 x 24.4 cm) and can be easily mounted to most ductwork using either of the two optional kits.



PHYSICAL DATA

Relative Humidity Range:   0 - 100%
Rh Accuracy:   ± 2% (10 - 90% Rh), ± 3% (0 - 10% and 90 - 100% Rh)
Operating Temperature Range:   32 to 158°F (0 to 70°C)
Temperature Measurement Range:   32 to 212°F (0 to 100°C)
Temperature Accuracy:   ± 1°F (0.5°C)
Output:   2 channels, each 4 - 20 mA, loop powered on Rh channel
Power Supply:   10 - 35 VDC
Ambient Operating Temperature Limits:   32 to 158°F (0 to 70°C)
Storage Temperature Limits:   -40 to 176°F (-40 to 80°C)
Housing:   ABS plastic
Sensor Probe:   5/16" x 10" (0.8 x 25.4 cm) stainless steel
Cable Length:   48 inches (1.22 meters)
Weight:   5.5 oz (156 gr)
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