A/RH2-20K-D

Relative Humidity Transmitter
Automation Components (ACI) | Part Number: ARH220KD
$154.50

The A/RH2-20K-D is a relative humidity transmitter having resistive temperature output. It utilizes a capacitive sensing element to deliver a proportional analog output. The features on board DIP switches which allow the user to select the desired output signal and can be powered by AC or DC power sources. Field calibration can be performed by using the on board increment and decrement DIP switches. These enhancements provide increased flexibility and outstanding long-term performance.

Ships in 4-6 weeks
  • Relative humidity transmitters utilize a capacitive sensing element to deliver a proportional analog output
  • This features on board DIP switches which allow the user to select the desired output signal
  • Field calibration can be performed by using the on board increment and decrement DIP switches
  • Duct and Outside Air configurations feature conformally coated circuit boards for moisture resistance
  • These enhancements provide increased flexibility and outstanding long-term performance

A/RH2-20K-D Technical Data

RH Supply Voltage
18 - 40 VDC / 18 - 28 VAC

RH Supply Current (VA)
Voltage Output: 8 mA maximum (0.32 VA)
Current Output: 24 mA maximum (0.83 VA)

RH Output Load Resistance
4-20 mA: 700 Ohms maximum
0-5 VDC or 0-10 VDC: 4K Ohms Minimum

RH Output Signal
2-wire: 4 - 20 mA (Factory Default)
3-wire: 0-5 or 0-10 VDC and 4 - 20 mA (Field Selectable)

RH Accuracy @ 77°F (25°C)
+/- 1% over 20% RH Range between 20 to 90%
+/- 2%, 3%, or 5% from 10 to 95%

RH Measurement Range
0-100%

Operating RH Range
0 to 95% RH, non-condensing (Conformally Coated PCB’s)

Operating and Storage Range
-40 to 140 F (-40 to 60 C)

RH Stability, Repeatability, Sensitivity
Less than 2% drift / 5 years
0.5% RH
0.1% RH

RH Response Time
20 Seconds Typical

RH Sensor Type
Capacitive with Hydrophobic Filter

RH Transmitter Stabilization Time
30 Minutes (Recommended time before doing accuracy veri cation)

RH Connections and Wire Size
Screw Terminal Blocks (Polarity Sensitive), 16-26 AWG

RH Terminal Block Torque Rating
4.43 to 5.31 lb-in (0.5 to 0.6 Nm)

RH NIST Test Points
Default Test Points: 3 Points (20%, 50% & 80%)
5 Points (20%, 35%, 50%, 65% & 80%)
1% NIST Test Points: 5 Points within selected 20% Range (ie. 30%-50% are 30, 35, 40, 45 & 50)

Thermistor Resistive Output @ 77 F
20 k ohm

Thermistor Accuracy
+/- 0.36 F (0.2 C)

Thermistor Power Dissipation Constant
mW/C

Thermistor Sensor Response Time
10 Seconds nominal

Lead Wire Length and Conductor Size
14" 22 AWG

Insulation and Rating
Etched Teflon (PTFE) Colored Leads, Mil Spec 16878/4 Type E