Emerson E2 Insertion Temperature Probe, Supply and Return Air Sensors, Application Sensor Type

3.5.4 Insertion Temperature Probe

3.5.4.1Location

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.

3.5.4.2Mounting

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 3-21shows the installation of the insertion probe (self-tapping screws are not provided).

Figure 3-21- 12-Inch Insertion Probe Mounting

3.5.5Supply and Return Air

Sensors

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.

3.5.6Refrigeration System Temperature Probes and Sensors

3.5.6.1Location

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 3-1lists some

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

Application	Sensor Type
Condenser Outlet (Drop Leg)	High Temperature
	Bullet
Liquid (Manifold)	Pipe Mount
Suction Temperature	Pipe Mount
Discharge Air	Bullet
Ambient Temperature (Out-	Bullet
side)
Condenser Sump	Insertion Probe
Defrost Termination	Bullet

Table 3-1- Sensor Application and Type

3.5.6.2Mounting Bullet and Pipe Mount

Sensors

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.

Figure 3-22- Sensor Orientation

3-8 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013