User's Manual

User Manual: Field Transmitter

2.4.1 Directly Mounting a Sensor Probe to the PCU

A directly mounted sensor probe is one that is screwed directly into the PCU body. For all other types see

section 2.4.2: Attaching a Remotely Mounted Sensor Probe to the PCU.

1) Apply two wraps of PTFE tape around the ½” NPT threads of the sensor probe in the clockwise direction

according to Figure 10: Direct mounted PTFE tape application Screw the sensor probe into one of the

two ½” NPT ports on the bottom of the PCU, removing the port plug if there was one installed. Ensure

the sensor probe is tightly screwed to the PCU expecting that the gland does not screw in all the way

due to the PTFE tape.

2) Prepare the sensor probe’s cable end as shown in Figure 12: Direct and remote sensor probe wire

preparation. Strip the outer jacket back 2” or 51mm, remove the fabric braid, foil and cloth wrapping. It is

recommended to cut the wire lengths at 5mm decrements starting with the white wire, followed by green,

shield, black and ending with the red wire. Strip the jackets 3mm to expose the inner conductors. Do not

attempt to strip the shield wire as it has no jacket.

3) Feed the prepared sensor probe cable through a gland and into the PCU wiring compartment where two

terminal strips labelled Port 1 and Port 2 are located. If you have not yet removed the PCU outer cover,

do so and you will see the wiring compartment. Match the wires colors to the silkscreen of the wiring

compartment. [WHT] is white, [GRN] is green, [SIL] is silver (the shield), [BLK] is black and [RED] is red.

Port 1 and 2 have electrically identical ratings and you may connect an HCD or HCDW to either port.

See Figure 14: Sensor probe wiring for a final wiring solution.

4) Screw the PCU outer cover on the wiring compartment to ensure a tight fit that won’t come off easily.

Enclosure threads should be free of dirt and other debris to prevent seizure of outer cover. Only tighten

the outer cover by hand to avoid damaging the device.

Field Replacement Instructions: To replace directly mounted sensor probes on the PCU, unscrew the

PCU outer cover by hand. Then detach all cable wires from Port 1 and/or Port 2 of the wiring

compartment. Unscrew the direct mounted sensor probes from the two ½” NPT ports on the bottom of

the PCU. Finally, complete section 2.4.1 steps 1 to 4.

2.4.2 Attaching a Remotely Mounted Sensor Probe to the PCU

Remotely mounted sensors require installation of a cable gland.

Figure 13: PCU wiring compartment

Figure 14: Sensor probe wiring

(see 2.4.1 and 2.4.2 setup instructions)