Analyzer Preventive Maintenance Schedule - Ametek 241CE II Operator's Manual

Frequency
Each Time the Electronics Enclosure is Opened
Monthly

RUN Mode

RUN Mode
MonitorCFGWLED (or
HCLED)
Monthly
Every 6 Months
Every 6 Months
6-4 | Model 241CE II Hydrocarbon Dewpoint Analyzer

Analyzer Preventive Maintenance Schedule

Task
Electronics Enclosure Flamepaths
Each time the Electronics Enclosure is opened, inspect the joining surfaces for damage
(scratches, dents, etc.). Also, inspect the flamepaths around the User Interface's window
and push-buttons for signs of wear (discoloration) or damage (bent or scratched push-
buttons).
Before closing the Electronics Enclosure door, carefully clean the joining surfaces
(flamepath) with a soft non-abrasive cloth. If it is necessary to use a cleaning agent, the
agent must be non-abrasive and must not attack aluminum.
See "Examining and Caring For the Flamepaths" in this chapter. See also "Flamepath
Gap" in this schedule.
Baseline Settings
Check and record the phototransistor signals – WMir and HCMir (baselines) – from
the RUN Mode screen during the Purge cycle (Purging/Hold Stage) when the mirror
temperature is at the upper setpoint (i.e., 20 °C). Compare these values to the values
listed in the "Gas Run Data" sheets (part of the "Signed Final QC Documents" in the
Documentation Package shipped with the analyzer). Refer to the values at the start of the
Cooling stage.
Also, check and record the H2O-Side (WLED) and the HC-Side (HCLED) mirror surface
LED brightness levels for deviations from the original settings. Compare these values to
their corresponding values on the "241_Dewpoint Monitor Data Sheets" (H2O-Side Level
and HC-Side Level under "Mirror LED Settings"), also included in the Documentation
Package.
If the WMir/HCMir signals or WLED/HCLED levels have deviated >25 units from their
original start-up values, it could indicate mirror contamination. Clean the Measuring Cell
and mirror. See "Cleaning the Measuring Cell and Replacing its O-Ring" in this chapter.
Operating Temperatures
From the RUN Mode screen, check and record the operating temperatures to ensure they
are all within 2 % of their setpoints. Compare the current temperatures to the actual settings.
Sheltered Systems
If your analyzer is installed in a custom shelter, check the air filters for the shelter purge
and air conditioning systems and replace them if necessary. Depending on the location of
the site and its environmental conditions, it may be necessary to check and replace these
filters more frequently.
Filterblock Assembly, Cleaning
Clean all interior parts in the Filterblock Assembly. This schedule is a minimum
requirement. If the internal parts are severely contaminated, more frequent cleaning may
be required.
While the Filterblock Assembly is apart, inspect the Membrane Filters, o-rings, and Flow
Restrictors for damage or severe contamination. Replace the Membrane Filters if they are
creased, have holes, are transparent, or if liquids, oils, or waxes have been forced through
them. Replace the o-rings and Flow Restrictors if they cannot be re-used. (Typically,
the recommended replacement of these parts is annually unless they are damaged or
contaminated.)
See also "Cleaning and Replacing Parts in the Filterblock Assembly" in this chapter.