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Model T101 Instruction Manual Principles Of Operation
275
10.7.2. CALIBRATION - SLOPE AND OFFSET
Calibration of the analyzer is performed exclusively in software. During instrument
calibration (Chapters 6 and 7) the user enters expected values for zero and span through
the front panel keypad and commands the instrument to make readings of sample gases
with know concentrations of H
2
S. The readings taken are adjusted, linearized, and
compared to the expected values as input. With this information the software computes
values for instrument both slope and offset and stores these values in memory for use in
calculating the H
2
S concentration of the sample gas.
Instrument slope and offset values recorded during the last calibration can be viewed by
pressing the following keystroke sequence
SAMPLE RANGE = 500.0 PPB H2S =XXX.X
< TST TST > CAL SETUP
SAMPLE TIME = HH:MM:SS H2S =XXX.X
< TST TST > CAL SETUP
SAMPLE PMT TEMP=7.0C H2S =XXX.X
< TST TST > CAL SETUP
SAMPLE BOX TEMP=30.0C H2S
=XXX.X
SAMPLE RCELL TEMP=50.0C H2S
=XXX.X
SAMPLE HVPS 553 VOLTS H2S =XXX.X
< TST TST > CAL SETUP
SAMPLE H2S OFFS=XX.X MV H2S =XXX.X
< TST TST > CAL SETUP
SAMPLE H2S SLOPE=XXX H2S =XXX.X
< TST TST > CAL SETUP
NOTE
Separate slope and offset values are calculated and recorded for H
2
S and SO
2
gas
measurements. Here they are shown as they appear when analyzer is in H2S Mode.
In SO2 Mode they appear as SO2 OFFS & SO2 SLOPE. In multigas mode, both versions
appear.
07266B DCN6485