Emerson CMF200A Manuel d'installation télécharger pdf (Page 34)

4. Connect the supply of nitrogen or argon gas to the inlet purge connection or open

inlet purge line. Leave the outlet connection open.

• 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.

Note

Keep the purge gas pressure below 30 psig (2 bar).

Purge timeTable 5-1:

Sensor model Purge rate, in ft

/hr (l/h) Time, in 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

CMF350 20 (566) 45

CMF400 20 (566) 55

CMFHC2 20 (566) 100

CMFHC3 20 (566) 170

CMFHC4 20 (566) 268

CMFS007 20 (566) 1 1/2

CMFS010 20 (566) 1 1/2

CMFS015 20 (566) 1 1/2

CMFS025 20 (566) 4 1/2

CMFS040 20 (566) 4 1/2

CMFS050 20 (566) 4 1/2

CMFS075 20 (566) 6

Supplementary information

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Emerson CMF200A Manuel d'installation Page 34