Emerson E2 User Manual

The 12-inch insertion temperature probe may be used 

to monitor temperature in either the supply or return air 
ducts of the AHU or RTU.

The insertion probe may be mounted in any orientation 

within the duct as long as the probe is in the air flow of the 
duct. The probe housing should be secured using self-tap-
ping screws. A 0.250” diameter hole is required for the 
probe. Figure 3-21 shows the installation of the insertion 
probe (self-tapping screws are not provided).

In addition to the 12-inch insertion temperature probe, 

Emerson Retail Solutions uses the same temperature sen-
sor used for outside and inside temperature to monitor sup-
ply and return air temperature. When used in this 
application, the sensors are supplied without enclosure 
covers. The sensors should be mounted directly in the air 
stream of the supply or return air duct. The sensors are not 
supplied with any mounting hardware for this application.

Emerson Retail Solutions 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 manu-
facturer. If a device must be added to the system, refer to 
the information supplied with the device and consult the 
refrigeration equipment manufacturer. Table 3-1 lists some 

typical sensor applications and the sensor or probe most 
suited for that purpose.

Condenser Outlet (Drop Leg)

High Temperature 
Bullet

Liquid (Manifold)

Pipe Mount

Suction Temperature

Pipe Mount

Discharge Air

Bullet

Ambient Temperature (Out-
side)

Bullet

Condenser Sump

Insertion Probe

Defrost Termination

Bullet

Bullet or pipe mount sensors mounted on refrigerant 

lines should be secured with a Panduit low temperature 
cable tie, 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.

Sensors located on refrigerant lines should be insulated 

to eliminate the influence of the surrounding air. A self-
adhering insulation that will not absorb moisture is recom-
mended to prevent ice logging at the sensor location.

The sensor should be positioned on the side of the line 

as shown in Figure 3-22.