4. Connect the supply of nitrogen or argon gas to the inlet purge connection or open
inlet purge line. Leave the outlet connection open.
NOTICE
• Exercise caution to avoid introducing dirt, moisture, rust, or other contaminants
into the sensor case.
• If the purge gas is heavier than air (such as argon), locate the inlet lower than the
outlet, so that the purge gas will displace air from bottom to top.
• If the purge gas is lighter than air (such as nitrogen), locate the inlet higher than
the outlet, so that the purge gas will displace air from top to bottom.
5. Make sure that there is a tight seal between the inlet connection and sensor case, so
that air cannot be drawn by suction into the case or purge line during the purging
process.
6. Run purge gas through the sensor.
The purge time is the amount of time required for full exchange of atmosphere to
inert gas. The larger the line size, the greater amount of time is required to purge
the case. If purge lines are being used, increase the purge time to fill the additional
volume of the purge line.
Important
Keep the purge gas pressure below 7.25 psi (0.5 bar).
Table 6-1: Purge time
Sensor model Purge rate Time, in minutes
CMF010 20 ft3/h (566.3 l/h) 1
CMF025 20 ft3/h (566.3 l/h) 1
CMF050 20 ft3/h (566.3 l/h) 2
CMF100 20 ft3/h (566.3 l/h) 5
CMF200 20 ft3/h (566.3 l/h) 12
CMF300 20 ft3/h (566.3 l/h) 30
CMF350 20 ft3/h (566.3 l/h) 45
CMF400 20 ft3/h (566.3 l/h) 55
CMFHC2 20 ft3/h (566.3 l/h) 100
CMFHC3 20 ft3/h (566.3 l/h) 170
CMFHC4 20 ft3/h (566.3 l/h) 268
CMFS007 20 ft3/h (566.3 l/h) 1 1/2
CMFS010 20 ft3/h (566.3 l/h) 1 1/2
CMFS015 20 ft3/h (566.3 l/h) 1 1/2
CMFS025 20 ft3/h (566.3 l/h) 4 1/2
CMFS040 20 ft3/h (566.3 l/h) 4 1/2
CMFS050 20 ft3/h (566.3 l/h) 4 1/2
Supplementary information Installation Manual
October 2021 20002158
38 Micro Motion ELITE
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