Relative Humidity/ Temperature Transmitter

( Dwyer )

Feature:
The Model 657C-1 Transmitter provids 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__ 9-1/10_ (0.8_ 23.1 cm) and can be easily mounted to most ductwork using either of the two optional kits below.
Specifications:
Service	Humidity & temperature detection in air.
Range	Relative Humidity: 0-100%; Temperature: 32 to 212ºF (0 to 100ºC).
Accuracy	Relative Humidity: ±2% (10-90% RH), ±3% (0-10% and 90- 100% RH); Temperature: ±1ºF (0.5ºC).
Temperature Limits	32 to 158ºF (0 to 70ºC).
Pressure Limits	1 psi max.
Compensated Temperature Range	32 to 158°F (0 to 70°C).
Power Requirements	10-35 VDC.
Output Signal	2 channels each 4-20mA. Loop powered on the RH channel.
Electrical Connections	4 screw type terminal.
Mounting Orientation	Mount in any position.
Probe	5/16˝ x 9-1/10˝ (0.8 x 23.1 cm) stainless steel.
Weight	10 oz (284 g).