Emerson Rosemount 228, Reference Manual, Page: 20 / 44

See the wiring diagrams in Figure 3-2 , Figure 3-3 , and Figure 3-4 . For cable PN
23294-00, follow the wiring for the 228-54 sensor. For cable PN 23294-05, follow
the wiring for the 228-56 sensor with the following exception:
Refer to the wire function diagram for the 228-56 option in Figure 3-1 and identify
the RTD wire bundle. Connect the RTD wires to the transmitter as follows:
• Green - RTD in
• Black - no connection
• Clear - RTD common or RTD return
• White - RTD sense
Wrap the bare end of the black wire to prevent accidental connections.
4. Using a 1/2 in. (13 mm) socket wrench, retract the sensor into the retraction
chamber.
5. Install the assembly on the 1-1/2 in. NPT full port ball valve mounted in the process
line or vessel.
6. Tighten the union nut.
7. Open the ball valve and check for leaks.
8. Using a 1/2 in. (13 mm) socket wrench, inser the sensor into the process line or
vessel.
9. Position the sensor at least 1/2 in. (13 mm) away from any wall of the vessel or pipe.
Set the travel stop collar
A net to the nut housing.
WARNING!
HIGH PRESSURE
Do not loosen cap screws or collar when pressurized.
Failure to reduce pressure may cause a loose part to disengage and cause injury to
personnel.
Retracting a Mechanical Retraction Assembly
Prerequisites
Make sure that the system pressure is less than 295 psig (2135 kPa [abs]) before retracting
the sensor.
Procedure
1. Retract the sensor using a 1/2 in. (13 mm) socket wrench. When the sensor clears
the ball valve, close the valve.
WARNING!
HIGH PRESSURE
Retraction chamber contents may be under pressure.
Failure to reduce pressure may cause a loose part to disengage and cause injury to
personnel.
Install
14 Reference Manual