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TROUBLESHOOTING & REPAIR M102E/M501 TRS
(Addendum to M101E Manual - P/N 04740 Rev A)
10.4. Subsystem Checkout
In addition to the information contained in Section 11.5 of the M101E Manual - P/N 04740 Rev A,
the following diagnostic procedures are useful for troubleshooting and diagnosing problems with
your M102E and M501-TRS.
10.4.1. Checking the Efficiency of the M501-TRS SO
2
Scrubber
See Section 8.1.1.2 of this addendum
10.4.2. Checking the Efficiency of the M501-TRS TRS Æ SO
2
Converter
To check to see if your TRS Æ SO
2
converter is operating properly:
1. Set the analyzer to TRS measurement mode (see Section 6.8.1 of the M101E Manual - P/N
04740 Rev A).
2. Bypass the scrubber inside the M501-TRS.
a. Unscrew the pneumatic fittings from the scrubber.
b. Connect them with a stainless steel or Teflon
®
union.
3. Supply a gas with a known concentration of SO
2
to the sample gas inlet of the analyzer.
4. Wait until the analyzer’s output concentration measurement stabilizes. This can be
determined by setting the analyzer’s display to show the TRS STB test function (see Section
6.2.1 of the M101E Manual - P/N 04740 Rev A) TRS STB should be 0.5 ppb or less before
proceeding.
5. Record the stable SO
2
concentration (Although the concentration is labeled TRS, we are
measuring SO
2
)
6. Supply a gas with a concentration of H
2
S equal to that of the SO
2
gas used in steps 2 through
5 above, to the sample gas inlet of the analyzer.
7. Wait until the analyzer’s output concentration measurement stabilizes. This can be
determined by setting the analyzer’s display to show the TRS STB test function (see Section
6.2.1) TRS STB should be 0.5 ppb or less before proceeding.
8. Record the stable TRS concentration
9. Divide the TRS concentration by the SO
2
concentration
EXAMPLE: If the SO
2
and TRS concentration of the two test gases used is 500 ppb:
Measured SO
2
concentration = 499.1 ppb
Measured TRS concentration = 490.3 ppb
Converter Efficiency = 490.3 ÷ 499.1
Converter Efficiency = 0.982 (98.2%)
54 05514 Rev A1