Teledyne 100AH instruction manual Factory Calibration Procedure Quick Cal, 10-21

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

10.1.6 Factory Calibration Procedure (Quick Cal)

This procedure is referred to in other Teledyne API instrument manuals as the "Quick Cal" procedure. It is used at the factory when the instrument is first set-up.

The Factory Cal procedure balances the PMT, Preamp, and software gain factors so the instrument has optimum noise, linearity, and dynamic range. It should be used when you are unable to zero or span the instrument, when the slope and offset values are outside of acceptable range, or when other more obvious reasons for problems have been eliminated.

NOTE

In this procedure a range of 500 PPM and a span gas concentration of

400 PPM is used as an example. Other values can be used.

PMT Calibration Procedure:

1.On the Preamp board, set S2 to 'B', set S1 to 2. Turn R19 25 turns counter-clockwise, then 12 turns clockwise. (see Figure 2-5)

2.Align the beam splitter assembly per Section 10.4.2.

3.Adjust the UV lamp per Section 10.4.2 and reset the Lamp Cal value by selecting SETUP- MORE-DIAG and scroll to select LAMP CALIBRATION. Reset the LAMP CAL value by pressing ENTR. Value displayed is the current UV lamp intensity and pressing ENTR will update the value.

4.Set RANGE MODE to SING by SETUP-RNGE-MODE to select single range operation.

5.Set the RANGE to 500 PPM by SETUP-RNGE-SET and key in 500, then press ENTR.

6.Input 400 PPM of SO2 span gas in the sample inlet port.

7.Scroll to the PMT - TEST function.

8.In this example the expected span gas concentration is 400 PPM and therefore the expected voltage is about 3.5 V.

9.Adjust S2, the HVPS coarse adjustment, on the preamp board to the setting that produces a signal that is closest to 3.5 V. Adjust S1, the HVPS fine adjustment, to the setting that produces a signal that is closest to 3.5 V. Use R19 to trim the reading to 3.5 ± 0.1V.

10.Recalibrate the instrument for both zero and span to calculate the slope and offset (refer to Section 8). The above procedure is to assure that the instrument will operate with optimum noise, linearity, and dynamic range.

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