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CALIBRATION PROCEDURES
Model 400E Ozone Analyzer
Instruction Manual
174
P/N 04316 Rev: B
NOTE:
Once the CALS and CALZ procedures are activated, the concentration field of the
instrument’s front panel display will change to “XXXX" and the output of t he analog
outputs will go to 0.0 mV. Also, the SAMPLE LED on the front panel will begin to blink
indicating that the analyzer’s iDAS Holdoff feature is active. These conditions will persist
for 60 seconds.
The same thing will occur after the analyzer is returned to SAMPLE mode by pushing the
EXIT button.
7.4.1.
Zero/Span Calibration on Auto Range or Dual Ranges
If the analyzer is being operated in Dual Range mode or Auto Range mode, then
the High and Low ranges must be independently calibrated.
When the analyzer is in either Dual or Auto Range modes the user must run a
separate calibration procedure for each range. After pressing the
CAL
,
CALZ
or
CALS
keys the user is prompted for the range that is to be calibrated as seen in the
CALZ
example below:
SAMPLE
RANGE = 500.0 PPB O3 =XXX.X
< TST TST > CAL
CALZ
CALS
SETUP
ZERO CAL M
RANGE = 500.0 PPB O3 =XXX.X
< TST TST >
ZERO
CONC
EXIT
WAIT 10
MINUTES
Or until the
reading
stabilizes and
the
ZERO
button
is displayed
Analyzer enters
ZERO CAL
Mode
See Table 5-1 for Z/S
Valve States during
this operating mode
SAMPLE
RANGE TO CAL: LOW
LOW
HIGH
ENTR
SETUP
SAMPLE
RANGE TO CAL: HIGH
LOW HIGH
ENTR
SETUP
Continue Calibration as per
Standard Procedure
Once this selection is made, the calibration procedure continues as previously
described in Section 7.2. The other range may be calibrated by starting over from
the main
SAMPLE
display.