Ametek 241CE II Operator's Manual page 121


RUN Mode
ApplicCFGMTLo

RUN Mode
ApplicCFGPurge
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 Measuring 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
CAUTION
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 configura-
tion 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 pow-
er 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 3.
Maintenance and Troubleshooting
|
6-7