Humidity Sensors
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HP971 Pneumatic Humidity Sensor
One- or two-pipe, direct-acting humidity sensor used with RP908/
RP920 Controllers to provide proportional control of pneumatic
valve or damper actuators in systems requiring humidification or
dehumidification control.
• Corrosion resistant materials.
• Simple plug-in air head connections.
• Factory calibrated.
• Continuous relative humidity indication available by using receiver
gage.
• Integral or external restriction can be used.
HP971A One-Pipe Application HP971A Two-Pipe Application
Application Type: Humidity Sensor
Dimensions, Approximate: 3 1/4 in. high x 2 in. wide x 1 5/8 in. deep
(88 mm high x 51 mm wide x 41 mm deep)
Action: Direct Acting
Airflow Usage: 0.022 scfm (10.4 mL/s)
Connections: Push-on barb for 5/32 in. (4 mm) O.D. tubing
Maximum Operating Temperature:
125 F (52 C)
Maximum Operating Pressure: 25 psi (172 kPa)
Output Pressure Range: 3 psi to 15 psi (21 kPa to 103 kPa)
Supply Pressure: 16-21 psi (110-145 kPa)
M
2
3
1
4
89
N.C.
RP920A
CONTROLLER
RA
M5569
HUMIDIFIER
VALVE
MB
HP971A
HUMIDITY
SENSOR
M
2
3
1
4
89
N.C.
RP920A
CONTROLLER
RA
M5568A
HUMIDIFIER
VALVE
MB
HP971A
HUMIDITY
SENSOR
RA
HP970B
HIGH LIMIT
(OPTIONAL)
MB
M
Product Number
Number of
Pipes Sensor Range Mounting Description Comments
HP971A1008 1 or 2 15 to 75% RH Vertical or Horizontal Wall Mounting or
Mounted in Duct Sampling Chamber
Pneumatic Humidity Sensor, 15
to 75% RH range
Order Cover
Separately
HP971A1024 1 or 2 15 to 85% RH Vertical or Horizontal Wall Mounting or
Mounted in Duct Sampling Chamber
Pneumatic Humidity Sensor, 15
to 85% RH range
Order Cover
Separately
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