Emerson Wall-Mounted RH Sensor and RH Operating manual

Wall-Mounted RH Sensor and RH/Temperature Sensor

Product Information Sheet 203-5751

Overview

CPC specs a wall-mounted relative humidity (RH)

sensor (P/N 203-5751) and/or RH and temperature

sensor (P/N 203-5752) for use in building control and

anti-sweat control applications using CPC input

boards.

Specifications

General

Input Power 12VDC

Enclosure High-impact plastic, white

Relative Humidity (RH)

Sensing

Element

Digitally profiled thin-film

capacitive

RH Accuracy ±3% RH over the range 20%-90%

Stability <0.5% RH per year

Operating

Humidity Range

0-100% RH

Analog Output 0-5VDC; 3-wire, observe

polarity

Scaling 0-100% RH

Temperature

Accuracy

±0.4°F from 32°F to 140°F

Analog Out Resistive, 2-wire, no polarity

Choosing a Mounting

Location

Mount the sensor indoors in a central location within

the zone to be measured, away from doors, windows,

vents, heaters, and outside walls that could affect

temperature readings. The sensor should be at least

four feet from the floor, and no higher than necessary

to prevent tampering.

Mounting

1. Insert a screwdriver into the gap in the plastic

on the bottom side of the sensor enclosure,

and pry the front part of the enclosure away

from the rear mounting plate. Pull the front

away from the mounting plate until the top

separates from the mounting plate.

2. Remove the punch outs above the wiring

connectors so that the sensor cables can be

run into the sensor enclosure (see Figure 1).

3. Use the pre-made holes to mount the plate

on a junction box using the screws provided,

or mount it against a wall or riser. Do not

mount the plate upside down or sideways.

The plate should be mounted with the

terminal blocks toward the bottom.

4. If necessary, drill or cut a hole in the wall to

allow the sensor cable to be run through the

wall into the sensor’s terminal block.

Figure 1 - RH/Temp Sensor Back Plate

Wall-Mounted RH Sensor and RH/Temperature Sensor

Product Information Sheet

Wall-Mounted RH Sensor and RH/Temperature Sensor

Product Information Sheet 203-5751

RH Sensor Wiring

1. Use Belden #8771 shielded three-conductor

cable or equivalent.

NOTE: Seat the connector on the back plate if it

becomes dislodged.

2. Connect the RED, BLACK, and WHITE wires to

the screw terminals the sensor’s connector

as shown in Figure 2. Clip the SHIELD wire.

3. Connect the SHIELD and BLACK wires to the

0V terminal of the input board (under INPUT

1). Connect the WHITE wire to the SIG

terminal of the input board.

4. Connect the RED wire to the +12V power

terminal on the input board.

5. Locate the input dip switch for the sensor

point, and set to the OFF position (LEFT for

MultiFlex, DOWN for 16AI). Refer to the input

board’s user manual for locations of the

input dip switches.

RH/Temp Sensor Wiring

RH wiring is the same as the RH wiring shown in

the diagram(Figure 2). For temp sensor

wiring, follow the steps below:

1. Use Belden #8761 shielded two-conductor

cable or equivalent.

NOTE: Seat the connector on the back plate if it

becomes dislodged.

2. Connect the BLACK and CLEAR wires to the

screw terminals the sensor’s connector as

shown in Figure 2. Clip the SHIELD wire. Note

that the third terminal on the sensor

connector is unused.

3. Connect the SHIELD and BLACK wires to the

0V terminal of the input board (under INPUT

2). Connect the CLEAR wire to the SIG

terminal of the input board.

4. Locate the input dip switch for the sensor

point, and set to the ON position (RIGHT for

MultiFlex, UP for 16AI). Refer to the input

board’s user manual for locations of the

input dip switches.

Figure 2 – Sensor and Input Board Wiring

Wall-Mounted RH Sensor and RH/Temperature Sensor

Product Information Sheet 203-5751

Finishing the Installation

Once the back plate of the sensor is mounted and the

sensor and board wiring is complete:

1. Attach the sensor circuit board enclosure to

the mounting plate. Push the top of the front

part onto the mounting plate so the hooked

mounting tabs fit underneath the circuit

board enclosure, and push the bottom part

down so that the three prongs on the back of

the circuit board fit into the wiring

connector. Continue pushing until the front

part is flush with the mounting plate.

2. Replace the front cover by inserting the

hooked tab at the top of the cover into the

slot on the front of the circuit board

enclosure so that it snaps into place. Press

the bottom of the cover until it snaps into

the enclosure.

NOTE: Do not expose sensor element to the fumes

of curing RTV silicone rubber. Doing so will

damage the calibration of the element.

EmersonTM , Emerson. Consider It Solved

TM and Emerson Climate TechnologiesTM logos are trademarks and service marks of Emerson Electric Co.

Intelligent StoreTM is a trademark of Emerson Climate Technologies. All other trademarks are the property of their respective owners.

Figure 3 – Sensor and Input Board Wiring

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