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M102E/M501 TRS TROUBLESHOOTING & REPAIR
(Addendum to M101E Manual - P/N 04740 Rev A)
If a reporting range other than 500 ppb is used in this procedure:
Use a span gas equal to 80% of the reporting range and adjust the PMT to a target
NORM PMT value of twice the ppb value of the span gas.
EXAMPLE
If the reporting range is 800 ppb:
Use 640 ppb span gas.
Adjust the PMT until NORM PMT equals 1280 mV ± 10 mV
13. Wait until the STABIL value is below 0.5 ppb,
14. Scroll to the NORM PMT value.
15. Set the HVPS coarse adjustment switch to the lowest setting that will give you more than 1000
mV NORM PMT signal.
• The coarse adjustment typically increments the NORM PMT signal in 100-300 mV steps.
16. Adjust the HVPS fine adjustment such that the NORM PMT value is at or just above 800 mV.
NOTE
Do not overload the PMT by setting both adjustment switches to their maximum setting.
This can cause permanent damage to the PMT.
17. Continue adjusting the both the coarse and fine switches until NORM PMT is as close to 800
mV as possible.
18. Adjust the gain adjustment potentiometer until the NORM PMT value is 800 mV ±10 mV.
19. Perform span and zero-point calibrations (see Chapter 7 of the M101E Manual - P/N 04740 Rev
A) to normalize the sensor response to its new PMT sensitivity.
20. Review the slope and offset values, and compare them to the values in Table 7-5 of the M101E
Manual - P/N 04740 Rev A.
10.5.5. Replacing the TRS Converter Heating Tube
WARNING !
THE CONVERTER TUBE AND HEATER ARE VERY HOT
DO NOT TOUCH WHILE THE M501-TRS IS OPERATING
1. Turn off the M501-TRS
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