5 Supplementary information
Topics covered in this chapter:
•
Purge the sensor case
•
Pressure relief
5.1 Purge the sensor case
If the sensor has purge fittings, they should remain sealed at all times. 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 customer support.
Whenever a purge plug is removed from the sensor case, you must repurge the case.
Prerequisites
Make sure the following are available before beginning the purge procedure:
• Teflon
™
tape
• Argon or nitrogen gas sufficient to purge the sensor case
Procedure
1. Shut down the process, or set control devices for manual operation. Before
performing the case purging procedure, shut down the process or set the control
devices for manual operation. Performing the purge procedure while the flowmeter
is operating could affect measurement accuracy, resulting in inaccurate flow signals.
2. Remove both purge plugs from the sensor case. If purge lines are being used, open
the valve in the purge lines.
DANGER!
• Stay clear of the rupture disk pressure relief area. High-pressure fluid escaping from
the sensor can cause severe injury or death. The sensor must be oriented so that
personnel and equipment will not be exposed to any discharge along the pressure
relief path.
• Take all necessary precautions when removing purge plugs. Removing a purge plug
compromises the secondary containment of the sensor and could expose the user to
process fluid.
• Improper pressurization of the sensor case could result in personal injury.
CAUTION!
Be sure to use thread protectors when removing the purge fitting so as not to damage
the disk membrane surrounding the rupture disk.
Supplementary information
Installation Manual 29
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