PMT Hardware Calibration (FACTORY CAL) Teledyne T100H SO2 Using in Analyzer Stack Emission

 The sensor module hardware calibration adjusts the slope of the PMT output when the instrument’s slope and offset values are outside of the acceptable range and all other more obvious causes for this problem have been eliminated.

1. Set the instrument reporting range type to SNGL (see Section 6.7.4 of the T100 Manual)

 2. Perform a zero–point calibration using zero air (see Section 7 of the T100 Manual).

 3. Let the instrument stabilize by allowing it to run for one hour.

 4. Adjust the UV Lamp. (See Section 10.3.2.1 of this addendum)

 5. Perform a LAMP CALIBRATION procedure (see Section 6.9.7 of the T100 Manual).

 6. Locate the Preamp board (see Figure 3-4 of this addendum).

 7. Locate the Following Components On the Preamp board (see Figure 10-5 of this addendum):

•  HVPS coarse adjustment switch (Range 0-9, then A-F)
•  HVPS fine adjustment switch (Range 0-9, then A-F)
•  Gain adjustment potentiometer (Full scale is 10 to 12 turns)

8. Set the HVPS coarse adjustment to its minimum setting (0).

 9. Set the HVPS fine adjustment switch to its maximum setting (F).

 10. Turn the gain adjustment potentiometer clockwise to its maximum setting.

 11. Set the front panel display to show STABIL (see Section 6.2.1 of the T100 Manual)

 12. Feed span gas into the analyzer.

 13. Wait until the STABIL value is below 0.5 ppm,

NOTE : Use a span gas  equal to 80% of the reporting range. 

Example: for a reporting range of 200 ppm, use a span gas of 160 ppm. 

14. Scroll to the OFFSET function and record the value.

 15. 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. 

16. Determine the target  NORM PMT value according to the following formulas.

•   If the reporting range is set for <500 ppm (the instrument will be using the 500 ppm physical range):

 Target NORM PMT = (8 x span gas concentration) + OFFSET 

•  If the reporting range is set for > 5,001 PPB (the instrument will be using the 5,500 ppm physical range):

 Target NORM PMT = (0.8 x span gas concentration) + OFFSET 

EXAMPLE: If the OFFSET  is 33 mV, the  Reporting Range is 1000 ppm, the span gas should be 800 

ppm SO2 and the calculation would be: 

                                        Target NORM PMT = (0.8 x 800) + 33 mV 

                                        Target NORM PMT =  640 + 33 mV 

                                        Target NORM PMT =  673 mV

 17. 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.

 18. Adjust the HVPS fine adjustment such that the NORM PMT value is at or just above the target NORM PMT signal from Step 16.

 19. Continue adjusting the both the coarse and fine switches until NORM PMT  is as close to (but not below) the target NORM PMT value from Step 16

20. Adjust gain adjustment potentiometer until the NORM PMT value is  ±10 mV of the target level from Step 16.

 21. Perform span calibration (see Section 7 of the T100 Manual)

 22. Scroll to the SLOPE function and record the value.

 23. If the value of the SLOPE is between 0.900 and 1.100 the PMT Hardware calibration is complete.

 24. If the value of the SLOPE is less than 0.900 or greater than 1.100:

•      Multiply the slope value from step 22 by the norm PMT value from step 19.
•      Repeat steps 17 through 24 using this new value for NORM PMT