Teledyne 6200E - Sulfides Analyzer - Manual (Page 237)

Model 6200E Instruction Manual Theory Of Operation
M6200E Rev: A1 237
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=0.0C H2S =XXX.X
< TST TST > CAL
SETUP
SAMPLE BOX TEMP=0.0C H2S =XXX.X
< TST TST > CAL
SETUP
SAMPLE RCELL TEMP=0.0C H2S =XXX.X
< TST TST > CAL
SETUP
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 H2S and SO2 gas
measurements. Here they are shown as they appear when analyzer is in H2S mode.
In SO2 mode appear as SO2 OFFS & SO2 SLOPE. In multigas mode, both versions
appear.
10.7.3. Temperature and Pressure Compensation (TPC)
Feature
As explained previously, changes in temperature can significantly effect the amount of fluoresced
UV light generated in the instruments sample chamber. To negate this effect the Model 6200E
maintains the sample gas at a stable, raised temperature.
Pressure changes can also have a noticeable, if more subtle, effect on the H
2
S concentration
calculation. To account for this, the Model 6200E software includes a feature which allows the
instrument to include a compensation factor in the H
2
S calculations that is based on changes in
ambient pressure.
When the TPC feature is enabled, the analyzer’s H
2
S concentration is divided by a factor called
PRESSCO which is based on the ratio between the ambient pressure of the sample gas and
standard atmospheric pressure (Equation 10-5). As ambient pressure increases, the compensated
H
2
S concentration is decreased.
A) - HG (" 29.92
_SLOPE SAMP_PRESS A) - HG (" SSURE SAMPLE_PRE
PRESSCO
×
=
Equation 10-5
SAMPLE-PRESSURE: The ambient pressure of the sample gas as measured by the instrument’s
sample pressure sensor (see Figure 10-7) in “Hg-A.
SAMP_PRESS_SLOPE: Sample pressure slope correction factor. The default setting for
Section 6.8 describes the method for enabling/disabling the TPC feature.