Relative Humidity And Temperature Transmitter

relative humidity and temperature transmitter

model 657-1 relative humidity/temperature transmitter

dual channel design for simultaneous 4-20 ma output signals

the series 657 transmitters provide two 4 to 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.

product applications

• cleanroom monitoring
• hvac/building control monitoring

modeldescription

• 657-1relative humidity/temperature transmitter.

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).
• enclosure 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:5/16" x 10" (0.8 x 25.4 cm) stainless steel.
• weight:5.5 oz (156 g).

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)

accessories

model numberdescription

• a-158split flange.
• a-159mounting gland with 1/2" male npt.