Emerson Wall-Mounted RH and RH/Temperature Sensor Installation Guide

Emerson offers wall-mounted relative humidity (RH) sensors (P/N 203-5751) and combined RH and temperature sensors (P/N 203-5752 and 203-5756). These are designed for building control and anti-sweat control applications, integrating with Emerson input boards.

Humidity (RH) and Temperature Sensor

Specifications

INPUT POWER
Voltage	Class 2; 12 to 24 Vdc or 24 Vac
AC Voltage Tolerance	±10%
AC Frequency	50/60 Hz

OUTPUT
Voltage Output	0 to 5 V or 0 to 10 V (jumper selectable)
Voltage Min. Load Resistance	5 kΩ
Voltage Min. Sinking Current	0.2 mA

HUMIDITY
RH Element	Digitally profiled thin-film capacitive, non-removable
Accuracy P/N 203-5752	3% (10 to 90% RH, 20 to 30°C)
Accuracy P/N 203-5756	2% (10 to 90% RH, 20 to 30°C)
Temperature Effect (Outside 20° to 30°C)	≤0.1% RH per °C
Response Time (to 90% change at 20°C)	110 sec
Annual Drift	≤1%
Output Scaling	0 to 100% RH

TEMPERATURE OPTION
Sensor Type	Thermistor, 10k Ohm

OPERATING ENVIRONMENT
Operating Temperature	0 to 50 °C (32 to 122 °F)
Operating Humidity	0 to 100% RH non-condensing (Unit will recover from saturation)

HOUSING
Material	ABS plastic with UL V-0 5VB Flame Class
Mounting Holes	US and European junction box

AGENCY APPROVAL
	The CE Mark indicates RoHS2 compliance. Please refer to the CE Declaration of Conformity for additional details. EMC Conformance: Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU.

Dimensions

The sensor housing has the following dimensions: Height: 4.9 inches (123 mm), Width: 3.2 inches (82 mm), Depth: 1.3 inches (34 mm).

Mounting

Mount the backplate on the wall in an appropriate location, ensuring the "Install This End Up" label is positioned in the upper right corner.
Wire the unit as described in the Wiring section.
Attach the front plate.

Wiring

Use Belden #8771 shielded three-conductor cable or equivalent.
Connect the RED, BLACK, and WHITE wires to the sensor's connector screw terminals. Clip the SHIELD wire.
Connect the SHIELD and BLACK wires to the 0V terminal of the input board. Connect the WHITE wire to the SIG terminal of the input board.
Connect the RED wire to the +12V power terminal on the input board.

Wiring Diagrams Description:

For P/N 203-5751:

RH In connects to RH
Power Source connects to PWR
GND connects to GND
RTD connects to RTD

For P/N 203-5752 and P/N 203-5756:

RH In connects to RH
Power Source connects to PWR
GND connects to GND
RTD connects to RTD (or Temp/RTD for temperature models)

Wiring Legend

Terminal	Description
RTD	[RTD symbol] RTD*
T/RTD	[RTD/Temperature symbol] RTD/Temperature*
RH	[Humidity symbol] Humidity
GND	[Ground symbol] GRND (DC- or AC1 and Output Common)
PWR	[Power symbol] POWER (DC+ or AC2)

*Temperature models only

Operations

Emerson wall-mounted humidity sensors measure the levels of RH and temperature (if equipped) within a room. To ensure accurate functionality, keep all pickup vents clear of dust and debris.

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Wall-mounted RH Sensor and RH/Temperature Sensor

Installation Guide