The Model 657C-1 Transmitter features the same circuit design as the 657-1 providing two 4 - 20 mA channels to produce separate output signals for both relative humidity and temperature. However, this model is housed in a tough die cast aluminum protective conduit enclosure with gasketed cover. An internal terminal block is provided for electrical connections. The sensor employed in the 657C-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 9 1/10" (0.8 x 23.1 cm) and can be easily mounted to most ductwork using either of the two optional kits below.



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:   Die cast aluminum
Conduit Connection:   ½"
Sensor Probe:   5/16" x 9 1/0" (0.8 x 23.1 cm) stainless steel
Weight:   10 oz (284 gr)
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