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Purge time (continued)Table 5-1:
Sensor model Purge rate, in ft
3
/hr (l/h) Time, in minutes
CMFS100 20 (566) 6
CMFS150 20 (566) 6
7. At the appropriate time, shut off the gas supply, then immediately seal the purge
outlet and inlet connections with the purge plugs.
Note
Avoid pressurizing the sensor case. If pressure inside the case elevates above atmospheric
pressure during operation, the flowmeter density calibration will be inaccurate.
8. Make sure that the purge fitting seals are tight so that air cannot be drawn by
suction into the sensor case.
5.2 About rupture disks
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. For more information about rupture disks, contact Micro Motion Customer
Service.
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.
CAUTION!
Stay clear of the rupture disk pressure relief area. High-pressure fluid escaping from the sensor
can cause severe injury or death.
Supplementary information
Installation Manual 31