Peripherals Manual Temperature Sensors • 41
immersion probe’s sheath. After mounting the immersion
probe’s sheath, screw the temperature probe and housing
into the sheath.
Pipe Mount Sensors
Bullet or pipe mount sensors mounted on refrigerant
lines should be secured with low temperature cable tie,
Panduit number PLT2S-M120, or equivalent. For pipe
mount sensors, the curved surface should be placed against
the pipe and the tie should be positioned in the groove on
the top surface of the sensor. A second tie should be used
to secure the lead to the pipe for additional support (leave
some slack in the lead between the tie and the sensor
block).
Sensors located on refrigerant lines should be insulated
to eliminate the influence of the surrounding air. A self-ad-
hering insulation that will not absorb moisture is recom-
mended to prevent icing at the sensor location.
The sensor should be positioned on the side of a refrig-
eration line as shown in Figure 33
Other Sensors
Supply and Return Air Sensors
CPC uses the same temperature sensor used for outside
and inside temperature to monitor supply and return air
temperatures in HVAC applications. When used in this ap-
plication, the sensors are supplied without enclosure cov-
ers. The sensors should be mounted directly in the air
stream of the supply or return air duct. The sensors are not
supplied with mounting hardware for this application.
Refrigeration System Temperature Probes
and Sensors
CPC supplies several temperature monitoring devices
including bullet sensors, pipe mount sensors, immersion
probes, insertion probes, and sensors for high temperature
applications. Each of these sensors is generally installed on
the system by the equipment manufacturer.
If a device must be added to the system, refer to the in-
formation supplied with the device and consult the refrig-
eration equipment manufacturer.
Wiring
Temperature sensors may be wired to any available
point on the 16AI board. Temperature sensors are polarity
insensitive. Wire one lead to an odd-numbered 16AI termi-
nal, and wire the other lead to an even-numbered terminal.
Once wired, the dip switch for the point to which the tem-
perature sensor is wired must be put in the up position,
since temperature sensors do not require power.
Figure 32-Immersion Probe with Sheath
Figure 33-Sensor Orientation
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