Emerson E2 Sensors and Transduc Ers, Pressure Transducers, Inside Temperature Sensor

Figure 3-19- External Repeater Mounting

For external repeaters, the mounting bracket at the bot- tom of the enclosure has two 0.156” bolt holes on either side. Use the bolt holes to mount these repeaters in the field as necessary (see Figure 3-19).

When mounting external repeaters, keep in mind that they require a 24VAC Class 2 power source in order to operate. This will likely require a transformer such as P/N 640-0041(110V) or P/N 640-0042(220V) to be mounted near the external repeater enclosure. Make sure there will be enough space next to the repeater to mount the trans- former.

3.4.2.3Mounting the Four-Channel

Repeater

The four-channel repeater (P/N 832-4830)serves the same basic function as the two-channel repeater: boosting signal strength. However, the four-channel repeater is also useful as a means of connecting the E2 to its associated devices using more than one daisy chain.

With a four-channel repeater mounted in the E2, you can run as many as three daisy chain segments out into the field, each of which can be as long as the prescribed Eche- lon maximum wire length. The fourth channel of the repeater can be used to connect other E2s in a separate daisy-chain, eliminating the need to run cable from the field back to the next E2.

The standoffs and mounting holes are located above the PIB in the back of the enclosure box. Use the mounting screws and standoffs to secure the four-channel repeater in place, and connect the repeater to the PIB with the two-pin power connector located next to the battery.

NOTE: Because the modem/communication expansion card and four-channel repeater card share the same mounting platform, they must be used separately.

REPEATER MOUNTS

E2 ENCLOSURE (4 Standoffs)

PIB 2-PIN POWER

CONNECTOR (J8 +5V)

Figure 3-20- E2 Repeater Mounting

3.5Sensors and Transduc-

ers

3.5.1Pressure Transducers

Retail Solutions transducers convert pressure readings to proportional electrical signals between 0.5 and 4.5 volts. The transducer is designed with a 1/8-inch male FPT fitting for connection to a standard access fitting. If the fit- ting 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

Sensors and Transducers Mounting • 3-7