Emerson E2 Product Temperature Probes, Humidity Sensors and Humidistats, Indoor RH Sensor

3.5.7Product Temperature

Probes

The product temperature probe is designed to be used alongside food products in a refrigeration case or freezer. The product probe uses a thermistor type temperature sen- sor in a sealed, cylindrical container (approximately 16 oz.). A magnet is contained at the bottom the probe’s enclosure to allow easy attachment to a side or bottom of a refrigeration case.

3.5.8Humidity Sensors and Humidistats

3.5.8.1Indoor RH Sensor

The indoor relative humidity sensor should be mounted in a central location within the zone to be mea- sured, away from doors, windows, vents, heaters, and out- side walls that could affect temperature readings. The sensor should be between four and six feet from the floor. Note that this sensor generates a small amount of heat; therefore, do not mount temperature sensors directly above RH sensors.

Mount RH sensor (P/N 203-5751)as follows:

1.With a flat-head screwdriver, push down the middle tab on the top of the sensor case and pop the lid off to expose the circuit board.

2.Insert the flat-head screwdriver into the two slots on either side of the top of the sensor case and twist to separate the back plate from the case.

3.Remove the knock-outs from the back plate before mounting so wires may be threaded through.

4.Mount the back plate to the wall using the two open mounting holes on the top and bot- tom of the plate.

5.Replace the cover on top of the back plate by lining up the tabs, and snap the lid back into place.

Figure 3-23- Indoor RH Mounting Dimensions

3.5.8.2Outdoor RH Sensors

The outdoor RH sensor (P/N 203-5761)

The outdoor RH sensor (P/N 203-5761)should always be mounted on the north side of the building if in the Northern Hemisphere, or on the south side if in the South- ern Hemisphere. The sensor should be mounted under an overhang or otherwise out of direct sunlight (if possible).

Mount the RH sensor (P/N 203-5761)as follows:

1.Secure the rear side of the enclosure to the out- side wall using the two mounting brackets, as shown in Figure 3-24. The tube holding the sen- sor element should point straight down.

2.If you will be running the sensor cable through the wall behind the sensor, cut or drill a hole in the wall through the hole in the enclosure.

Sensors and Transducers Mounting • 3-9