2105514-001 rev. AB | 13
3.6 Replacing the µFLO
G5
IMV assembly
3.6.1 Remove the IMV assembly
Removal of the complete IMV assembly is necessary and applicable in two
component replacement procedures:
— Transducer assembly replacement (either differential or linear assemblies)
— IMV assembly replacement (complete)
To remove the IMV assembly
1. Follow the procedure in section 3.1, Preserving data and configuration files, on
page 5. Return here when completed.
2. Follow the procedure in section 3.2, Disconnect power, on page 5. Return here
when completed.
3. Follow the procedure in section 3.4.1, Remove the I/O expansion board, on
page 6, if installed.
4. Disconnect the following, if connected, from the µFLO
G5
electronic board:
a. LCD display cable from J8 connector.
b. Communication connections:
- MMI communication cable plug from J9
- USB cable plug from J4
- Ethernet cable plug from J1
c. Field wiring connections:
- Communication wiring from J10
- DI wiring from J12
- DO wiring from J13
- RTD sensor from J3
DANGER – Serious damage to health / risk to life. Preparation for
removing the IMV should include shutting in the measurement sensor
and disconnecting the high and low input lines or manifold connections.
Depending on company policy, other steps may be required, but are
outside the scope of this document. Complete all requirements before
continuing.
5. Shut in the measurement sensor:
a. Using the manifold high/low control valves, equalize the pressure to the
IMV.
b. Using the high and low tap valves, close off both lines. These two valves
connect the meter run high/low output lines to the µFLO.
c. Vent the manifold to atmosphere using the vent valve.
d. Completely disconnect the high and low manifold lines from the IMV.
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