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Technical Bulletin - Outdoor Humidity Sensor (P/N 203-5761) Installation Instructions

Part #: 026-4808 Revision 0 Date: 02/26/2003

Wiring

NOTE: Do not clip or shorten the

wires leading from the sensor tube!

Shortening the wires will make

future sensor replacement difficult.

Use Belden #8771 shielded

three-conductor cable or

equivalent.

Connect the RED, BLACK,

and WHITE wires to the

RED, BLACK, and GREEN

wires from the sensor using

the wire nuts supplied in the

kit. Use the remaining wire

nuts to cap and insulate the

unused leads (BLUE,

ORANGE, and YELLOW). Clip the shield (BARE) wire.

On the input board, connect the SHIELD and BLACK wires to the 0V terminal. Connect the WHITE wire to the SIG ter-

minal of the input board.

Connect the RED wire to the +12V power terminal 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 outdoor humidity sensor is mounted and the sensor and board wiring is complete, check the gland

nut that secures the sensor tube assembly (inside the enclosure, as shown in Figure 1) and tighten if neces-

sary. Attach the cover plate (with the foam gasket included) to the sensor enclosure using the screws pro-

vided. Tighten all conduit connections, and cap all unused holes in the sensor enclosure using the caps

provided in the sensor kit. This will protect the wiring from moisture and the elements.

Calibration and Replacement

The sensing element of the 203-5761 duct-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 sens-

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

To replace a sensor element, pull the sensor's power connection from the input board. Remove the

cover plate of the enclosure. From inside the enclosure, loosen the gland nut that secures the sensor tube,

and press the sensor tube down until it hangs by the wires. Unscrew the slotted cover of the sensor tube to

expose the pluggable RH sensor element.

Note the orientation of the sensor element before unplugging it and plug the new sensor element in

using the same orientation (a pair of needle-nosed pliers might be necessary if it is difficult to line the sen-

sor up with the pins). Replace the slotted cover when finished, and push up on the sensor element cap until

it no longer sticks out through the bottom of the end of the tube. Tighten the gland nut and replace the

cover. 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.

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