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Teledyne API M100E Analyzer Operation Manual Troubleshooting & Repair
293
38. Scroll to the OFFSET function and record the value.
39. Scroll to the NORM PMT value.
NOTE
Do not overload the PMT by accidentally setting both adjustment switches to their maximum setting.
This can cause permanent damage to the PMT.
40. Determine the target NORM PMT value according to the following formulas.
If the reporting range is set for 2,000 ppb (the instrument will be using the 2,000 ppb physical range):
Target NORM PMT = (2 x span gas concentration) + OFFSET
If the reporting range is set for 2,001 ppb(the instrument will be using the 20,000 ppb physical range):
Target NORM PMT = (0.181 x span gas concentration) + OFFSET
EXAMPLE: If the OFFSET IS 33 mV, the Reporting Range is 500 ppb, the span gas should be 400 ppb
and the calculation would be:
Target NORM PMT = (2 x 400) + 33 mV
Target NORM PMT =
833 mV
41. Set the HVPS coarse adjustment switch to the lowest setting that will give you more than the target NORM
PMT signal from Step 16.
The coarse adjustment typically increments the NORM PMT signal in 100-300 mV steps.
42. Adjust the HVPS fine adjustment such that the NORM PMT value is at or just above the target NORM PMT
signal from Step 16.
43. Continue adjusting the both the coarse and fine switches until NORM PMT IS as close to (but not below)
the target NORM PMT signal from Step 16.
44. Adjust gain adjustment potentiometer until the NORM PMT value is ±10 mV of the target level from Step
16.
45. Perform span and zero-point calibrations (refer to Chapter 8) to normalize the sensor response to its new
PMT sensitivity.
46.
Revie
w the slope and offset values, and compare them to the values in Table 8-5.
12.8. TECHNICAL ASSISTANCE
If this manual and its troubleshooting / repair sections do not solve your problems, technical assistance may be
obtained from:
Teledyne API, Customer Service,
9480 Carroll Park Drive
San Diego, California 92121-5201USA
Toll-free Phone:
800-324-5190
Phone:
858-657-9800
Fax:
858-657-9816
Email:
api-customerservice@teledyne.com
Website:
http://www.teledyne-api.com/
Before you contact Teledyne API’ Customer service, fill out the problem report form in Appendix C, which is also
available online for electronic submission at http://www.teledyne-api.com/forms/
.
04515F DCN6048