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4 Operation
argon in nitrogen, normally zero gas of this application requires 40% argon
in nitrogen. However, 100% of nitrogen can be used to zero the analyzer.
In this case, the output offset is not needed to setup. For linear output the
accuracy will access successfully within +/-1% off. But, if the application is
analyzing the sample gas that is not linearly, the accuracy of the analyzer
may not meet the specification. Therefore, output offset require and yet
40% argon in nitrogen is also needed for zero calibration gas.
To set up the output reversal or output offset, see section 4.8.1-set
APPLICATION sceen.
NOTE: If the inverting has been setup, "i" shall display on the left
bottom corner. Otherwise, the left bottom corner display "n".
4.9.2 Polarity Reversal
In some special applications, user will find that the display dispalys
negative concentration values, even if proper span gas is injected. For
example, if application involves the analysis of 0-10% nitrogen in argon, and
the reference chamber is sealed with air instead of argon, the microproces-
sor will be detecting signal and process assuming that the reference chamber
is flowing with argon. However, in this case, the seal air reference that is
compared to background of argon from the measurement chamber which
has higher coeffiction parameter and then will cause the analyzer to go
negative. To correct this problem, TAI has added the Polarity Correction
feature. This feature can be set as follow:
Close S1-5 range 1
Close S1-6 range 2
Close S1-7 range 3
Close S1-8 cal range
Select STANDBY to restart the system.
4.9.3 Gain Preset
NOTE: This function will apply only for the analizer that has multiple
range with single application and non-linearity.
4-30
Teledyne Analytical Instruments
Model 2020
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