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22 Micro Motion
®
ELITE
®
Sensors
Rupture Disks
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.
Table 5 Time required to purge ELITE sensor cases
Sensor model
Purge rate
ft
3
/hr (l/hr)
Time
(1)
minutes
(1) If purge lines are being used, increase purge time to fill the additional volume.
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