Emerson CMF200A Installation Manual download pdf (Page 33)

5 Supplementary information

Topics covered in this chapter:

• Purge the sensor case

• About rupture disks

5.1 Purge the sensor case

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.

If a purge plug is removed from the sensor case, it will be necessary to repurge the case.

CAUTION!

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.

CAUTION!

Improper pressurization of the sensor case could result in 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.

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.

3. Prepare the purge plugs for reinstallation by wrapping them with 3–5 turns of Teflon

tape.

Supplementary information

Installation Manual 29

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Emerson CMF200A Installation Manual Page 33