Emerson E2 operation manual Sensors Transducers, Pressure Transducers, Inside Temperature Sensor

3.5Sensors and

Transducers

3.5.1Pressure Transducers

Emerson Retail Solutions transducers convert pressure readings to proportional electrical signals between 0.5 and

4.5volts. The transducer is designed with a 1/8-inch male FPT fitting for connection to a standard access fitting. If the fitting is configured with a Schrader valve, this fitting will have to be removed and replaced with a 1/8-inch female fitting. Each pressure transducer is supplied with 20 feet of cable for connection to a 16AI input board.

3.5.1.1Mounting

The pressure transducers should be mounted in a verti- cal position (pressure port down) above crank case oil level to prevent drainage of oil into transducer port.

3.5.2Inside Temperature Sensor

3.5.2.1Location

Inside temperature sensors are supplied within a wall- mounted enclosure for attachment to a standard switch plate.

The temperature sensor should be located in a central location—within the zone to be measured—away from doors, windows, vents, heaters, and outside walls that could affect temperature readings. In addition, the sensor should not be mounted above other sensors that generate heat during operation (such as relative humidity sensors).

The indoor temperature sensor should be between four and six feet from the floor.

3.5.2.2Mounting

Mount the sensor using the screws provided as shown in Figure 3-19.

Figure 3-19- Inside Temperature Sensor Mounting

3.5.3Outside Temperature

Sensor

3.5.3.1Location

The outside or ambient temperature sensor should be located on the north side of the building, preferably under an eave to prevent sun-heated air from affecting the tem- perature of the sensor.

3.5.3.2Mounting

The temperature sensor may be mounted using any standard tubing clamp. Emerson Retail Solutions also offers an aluminum cover and clamp (P/N 303-1111)which may be mounted as shown in Figure 3-20(fasteners are not provided).

Figure 3-20- Outside Temperature Sensor with Cover and Clamp

Sensors and Transducers Mounting • 3-7