Ametek 241CE II User Manual page 112


RUN Mode
ApplicCFGMTLo

RUN Mode
ApplicCFGPurge
4-24 | 241CE II Hydrocarbon Dewpoint Analyzer
"Part No." refers to Part Number.
To clean and replace parts in the Filterblock (see Figure 4-2):
Hazardous Locations
Before proceeding, test the area around the analyzer for explosive
gases and proceed only when the area is found to be safe.
Do not open the Electronics En closure, do not connect a serial cable
to the RS-232 serial port
up/down the analyzer or computer if there is an explosive gas atmo-
sphere present.
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 and
allow the gas pressure in the sample system and Measuring Cell to depres-
surize 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 – discon-
nect all tubing to the Filterblock.
4. Loosen – but do not remove – the two (2) mounting screws from the slots
on the Filterblock mounting bracket (to the backpan) and remove the
Filterblock. Move the Filterblock to a work bench.
Communications Port, and do not power
PN 903-8797, Rev A