MAINTENANCE SCHEDULE & PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
150
P/N 04288 Rev: A
4.
Replace the filter, being careful that the element is fully seated and centered
in the bottom of the holder.
5.
Re-install the PTFE o-ring with the notches up, the glass cover, then screw on
the retaining ring and hand tighten. Inspect the seal between the edge of
filter and the o-ring to assure a proper seal.
6.
Re-start the Analyzer.
9.3.2.
Rebuilding the Sample Pump
The diaphragm in the sample pump periodically wears out and must be replaced. A
sample rebuild kit is available – see Appendix B of this manual for the part number
of the pump rebuild kit. Instructions and diagrams are included with the kit.
Always perform a Flow and Leak Check after rebuilding the Sample Pump.
9.3.3.
Performing Leak Checks
Leaks are the most common cause of analyzer malfunction; Section 9.3.3.1
presents a simple leak check procedure. Section 9.3.3.2 details a more thorough
procedure.
9.3.3.1. Vacuum Leak Check and Pump Check
This method is easy and fast. It detects, but does not locate most leaks, it also
verifies that the sample pump is in good condition.
1.
Turn the analyzer ON, and allow enough time for flows to stabilize.
2.
Cap the sample inlet port.
3.
After several minutes, when the pressures have stabilized, note the following.
In the
TEST
menu, note the SAMPLE PRESSURE reading, and the VACUUM
reading.
4.
If both readings are < 10 in-Hg, the pump is in good condition.
5.
If both readings are equal within 10%, the instrument is free of large leaks.