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Model 400E Ozone Analyzer
Instruction Manual
THEORY OF OPERATION
P/N 04316 Rev: B
241
amount. Second the instantaneous concentration must exceed the average in the
long filter by a portion, or percentage, of the average in the long filter.
10.5.2.
Calibration - Slope and Offset
Calibration of the analyzer is performed exclusively in software. During instrument
calibration (see Sections 7 and 8) the user enters expected values for Zero and
Span via the Front Panel Keypad and commands the instrument to make readings
of calibrated sample gases for both levels. The readings taken are adjusted,
linearized, and compared to the expected values. With this information the
software computes values for instrument slope and offset and stores these values
in memory for use in calculating the O
3
Concentration of the sample gas.
The Instrument slope and offset values recorded during the last calibration can be
viewed by pressing the following keystroke sequence:
SAMPLE
RANGE = 500.0 PPB O3 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
TIME = 16:23:34
O3 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
OFFSET = 0.000
O3 =XXX.X
< TST
TST > CAL
SETUP
SAMPLE
SLOPE = 1.000
O3 =XXX.X
< TST
TST > CAL
SETUP
Содержание 400E
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