Page 18 IM 781-2
Outdoor Air Temperature and/or Relative Humidity Sensor
McQuay offers an outdoor air temperature (OAT) sensor for use with the CSM (McQuay Part # 049763302). McQuay also
offers a relative humidity sensor/OAT sensor combination (McQuay Part # 112024301). The only externally visible
difference is the appearance of the sensing element. The sensing elements are mounted inside a ventilated, treated white
PVC sun and wind shield to minimize the radiant energy and wind effects. All temperature sensors are negative temperature
coefficient, 10,000 ohm, Type 3 thermistors. The sun shield is mounted on a weatherproof outlet box for easy installation
on an outdoor surface using screws or toggle bolts (not provided).
The sensors should be mounted in the shade, away from all devices such as an exhaust fan that could disturb the normal
outdoor environment. A preferred location would be under the eaves of a north-facing wall. The sun shield fitting can be
rotated by hand at the time of installation to face either right or left, depending upon the specific requirements of each
situation. Do not mount sensors in vertical position with the sun shield pointing up.
Figure 16. Outdoor Air and/or Relative Humidity Sensor
2.00"
4.82"
2.87"
4.37" Long
1.33 " Dia
a0081
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