Dwyer Dywer 657C-1 Relative Humidity/Temperature Transmitter - 32 to 140°F (0 to 60°C) - 1 psi (.07 bar)

Features
 • The Dwyer Model 657C-1 Relative Humidity/Temperature Transmitter provides two 4 to 20 mA channels to produce separate output signals for both relative humidity and temperature  • This unit is housed in a die cast aluminum 1/2˝ LB conduit enclosure with internal screw terminals. A 5/16˝ x 9-1/10˝ stainless steel sensing probe extends through a side hub  • Sensor can be inserted directly into ducts and secured by optional mounting kits A-158 or A-159  • The A-158 kit consists of a split flange which is clamped around the probe and then attached to the duct exterior with sheet metal screws  • A rubber gasket is included to seal the connection  • The A-159 kit includes a bushing with 1/2˝ NPT male threads which is inserted through a hole in the duct  • It is then secured from the duct interior with a washer and locknut  • Alternatively, it can be threaded into a standard pipe flange mounted outside the duct

Applications
 • Cleanroom monitoring
 • HVAC/building control monitoring

Specifications

 • Relative Humidity Range: 0-100%
 • 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 to 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 with 1/2˝ conduit connection
 • Sensor Probe: 5/16˝ x 9-1/10˝ (0.8 x 25.4 cm) stainless steel

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