Sample System Leak Check - Ametek 241CE II Operator's Manual

3-36 | Model 241CE II Hydrocarbon Dewpoint Analyzer

Sample System Leak Check

The analyzer has been checked at the factory for pressure leaks. However,
fittings can loosen during transport, and the Sample, Vent, and Purge Gas
Lines are installed on-site. Therefore, the entire sample system should be
checked for leaks prior to powering up the analyzer for the first time, or
following the replacement of any lines/fittings or Measuring Cell or Filter-
block Assembly parts.
By introducing sample gas from the process stream into the sample sys-
tem, all connections within the sample system will be tested according to
normal operating conditions. Since the solenoid valve supplied with the
analyzer is normally closed (i.e., when not energized), this procedure will
check all components and connections from the process stream up to and
including the solenoid valve.
If the regulator is dialed in one-quarter of the way and the Bypass Valve is
opened, all of the analyzer's sample tubing will become pressurized even
with the Solenoid Valve closed (i.e., solenoid power is off).
If the site has a shut-off valve on the Vent Line, close it. Otherwise, cap
the Vent Line at the end to let the sample system build up line pressure.
Open the isolation valve on the Sample Probe and perform the leak check.
!
Do not apply power to the analyzer if there is damage (scratches,
indentations, or wear) to any flamepath (on the Electronics Enclosure
WARNING
or Cell assembly). Applying power to an analyzer with a damaged
flamepath is dangerous and could result in serious injury or death,
or serious damage to equipment. See "Examining and Caring for the
Flamepaths" in Chapter 6.
Replace parts immediately if damage or wear is apparent. Contact
AMETEK if there is any doubt about the integrity of any flamepath.
!
Do not exceed the maximum working pressure rating of the sample
system – 13.8 MPa (2000 PSIG) – under any circumstances.
CAUTION
Do not exceed a Vent Line pressure of 344 KPAG (50 PSIG).