Emerson CMF200A installation manual Rupture Disks, Time required to purge Elite sensor cases

Rupture Disks

Table 5 Time required to purge ELITE sensor cases

	Purge rate	Time(1)
Sensor model	ft3/hr (l/hr)	minutes
CMF010	20 (566)	1
CMF025	20 (566)	1
CMF050	20 (566)	2
CMF100	20 (566)	5
CMF200	20 (566)	12
CMF300	20 (566)	30
CMF400	20 (566)	55

(1) If purge lines are being used, increase purge time to fill the additional volume.

Rupture Disks

If the sensor has rupture disks, they are installed in the sensor purge fitting openings. The rupture disks should remain installed at all times. If you remove a rupture disk from the sensor case, it will be necessary to re-purge the case (see Case purging procedure on page 21).

Rupture disks are meant to vent process fluid from the sensor case in the event of a flow tube rupture. Some users connect a pipeline to the rupture disk to help contain escaping process fluid.

Stay clear of the rupture disk pressure relief area. High-pressure fluid escaping from the sensor can cause severe injury or death.

If a rupture disk is removed, the instructions for repurging the case provided under Case purging procedure on page 21 must be followed. Improperly pressurizing the sensor case can result in serious injury.

For more information about rupture disks, contact Micro Motion Customer Service.

22 Micro Motion® ELITE® Sensors