Purge Fittings - Emerson Micro Motion F Series Installation Manual

Purge Fittings

Purge Fittings
If the sensor has purge fittings, they should remain sealed at all times. After a purge plug has been removed,
the sensor case should be purged with argon or nitrogen and resealed.
Purging the case protects internal components. The sensor is purged of all oxygen and sealed at the factory. If
the purge plugs are never removed, it is not necessary to purge or re-seal the sensor. For more information,
contact Micro Motion Customer Service.
Removing a purge plug
If a purge plug is removed from the sensor case, it will be necessary to repurge the case.
Removing a purge plug compromises the secondary containment of the sensor
and could expose the user to process fluid.
The user should take all necessary precautions when removing the purge plugs,
because the sensor case may contain process fluid.
Improper pressurization of a sensor case could result in serious personal
injury.
Removing a purge plug will require the sensor case to be repurged with a dry inert
gas. Follow all instructions provided in the case purging procedure, below.
Case purging procedure
Read all instructions before performing the case purging procedure. It is not necessary to perform this
procedure unless a purge plug has been removed.
1. Shut down the process, or set control devices for manual operation.
Performing the purge procedure while the flowmeter is operating could affect
measurement accuracy, resulting in inaccurate flow signals.
Before performing the case purging procedure, shut down the process, or set control
devices for manual operation.
2. Remove both purge plugs from the sensor case. If purge lines are being used, open the valve in the
purge lines.
3. Prepare the purge plugs for reinstallation by wrapping them with 3–5 turns of Teflon
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Sensor Installation: F-Series