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Technical Bulletin - Wall-Mounted Humidity Sensor (P/N 203-5751) Installation Instructions

Part #: 026-4806 Revision 0 Date: 02/26/2003

Wiring

Use Belden #8771 shielded three-conductor cable

or equivalent.

Connect the RED, BLACK, and WHITE wires to

the screw terminals the sensor's connector as

shown in Figure 2. 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 termi-

nal on the input board.

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.

Finishing the Installation

Once the back plate of the sensor is mounted and the sensor and

board wiring is complete:

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.

Before putting the cover on the sensor circuit board enclosure, check the position of

the switch and the jumper on the front of the circuit board. The switch should be set

to the VOLTS (left) position. The jumper should be set to the 5V position (across

the center and right pins). If either or both of these are in the wrong position, set

them to the correct position. Refer to Figure 3 for positioning.

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.

Calibration and Replacement

The sensing element of the 203-5751 wall-mount RH sensor is pre-calibrated and will require no

physical adjustment. If the sensor drifts over time, the sensor can be 'recalibrated' by replacing

the pluggable sensing element. Contact CPC to order replacement elements (P/N 203-5795).

To replace a sensor element, use a screwdriver to pry the sensor circuit board off the mounting

plate. The sensing element is located on the back of the circuit board (see Figure 1). Note the ori-

entation of the sensor element before unplugging it and plug the new sensor element in using

the same orientation. Replace the circuit board when finished. There is no other calibration

method needed, and no adjustments are present in the unit.

Note: Do not expose sensor element to the fumes of curing RTV silicone rubber. Doing so

COMPUTER PROCESS CONTROLS - http://www.cpcus.com/

Figure 2 - Sensor and Input Board Wiring

will damage the calibration of the element.

Figure 3 - Switch & Jumper Settings

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