Table 6-1: Purge time (continued)
Sensor model Purge rate Time, in minutes
CMFS075 20 ft3/h (566.3 l/h) 6
CMFS100 20 ft3/h (566.3 l/h) 6
CMFS150 20 ft3/h (566.3 l/h) 6
7. At the appropriate time, shut off the gas supply, then immediately seal the purge
outlet and inlet connections with the purge plugs.
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.
6.2 Pressure relief
ELITE sensors are available with a rupture disk installed on the case. Rupture disks vent
process fluid from the sensor case in the unlikely event of a flow tube breach. Some users
connect a pipeline to the rupture disk to help contain escaping process fluid. For more
information about rupture disks, contact customer service.
If the sensor has a rupture disk, keep it installed at all times as it would otherwise be
necessary to re-purge the case. If the rupture disk is activated by a tube breach, the seal in
the rupture disk will be broken, and the Coriolis meter should be removed from service.
WARNING
• Orient the sensor so that personnel and equipment will not be exposed to any
discharge along the pressure relief path.
• Stay clear of the rupture disk pressure relief area. High-pressure fluid escaping from
the sensor can cause severe injury or death.
Installation Manual Supplementary information
20002158 October 2021
Installation Manual 39
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