Ametek 241CE II User Manual page 100


RUN Mode
ApplicCFGMTLo

RUN Mode
ApplicCFGPurge
4-12 | 241CE II Hydrocarbon Dewpoint Analyzer
To clean or replace the Sample and Vent Lines:
1. Bleed down the sample system. To do this, close the isolation valve on the
Sample Probe or at the Sample Inlet valve. Open the Bypass Valve, if not
already done, and allow the gas pressure in the sample system and Mea-
suring Cell to depressurize for approximately 5 minutes.
Never bleed down the sample system pressure from the sample inlet
side of the Filterblock Assembly. Pressure differentials of more than
210 KPA (30 PSI) in this direction can tear the Membrane Filters.
To decrease the bleed-down time, stop the normal measuring cycle by
changing the MTLo setting to 0.5 degree below the MTHi setting. (Record
the original value for future reference when returning it to its original
setting.) When exiting this menu, do not save the configuration to the
onboard EEPROM – this is a temporary condition only.
Change the purging time (Purge) to 20 minutes or greater. (Record the
original value for future reference when returning it to its original setting.)
When exiting this menu, do not save the configuration to the onboard
EEPROM – this is a temporary condition only.
2. After the sample system has depressurized, disconnect main AC power
to the analyzer by opening the power-disconnect switch (external to the
analyzer).
3. Using two wrenches – to avoid disturbing the connection fittings on the
Filterblock Assembly – disconnect all tubing to the Filterblock.
4. If you are cleaning the Sample and Vent Lines:
"Purge" the tubes to clear them of any debris or moisture. Use only clean,
dry air supplied at a water dewpoint less than -40 °C (-40 °F) and a flow rate
less than 15 L/day (0.53 CFD). Alternatively, you can use steam, if available.
If you are replacing the Sample and Vent Lines:
Follow the procedures for installing the Sample and Vent Lines listed under
"Installing the Sample and Vent Lines" in Chapter 2.
5. Reconnect all tubing connections. Hand-tighten the nut for each fitting.
Using two wrenches, use one to rotate the nut to the original position (an
increase in resistance will be encountered at the original position), then
tighten it slightly with the wrench. Repeat for the other fitting.
PN 903-8797, Rev A