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Model 400E Ozone Analyzer
Instruction Manual
CALIBRATION PROCEDURES
P/N 04316 Rev: B
179
7.6.
Automatic Zero/Span Cal/Check (AutoCal)
The AutoCal system allows unattended periodic operation of the ZERO/SPAN valve
options by using the M400E’s internal time of day clock. AutoCal operates by
executing SEQUENCES programmed by the user to initiate the various calibration
modes of the analyzer and open and close valves appropriately. It is possible to
program and run up to 3 separate sequences (
SEQ1
,
SEQ2
and
SEQ3
). Each
sequence can operate in one of 3 Modes, or be disabled.
Table 7-1: AUTOCAL Modes
Mode Name
Action
Disabled
Disables the Sequence.
Zero
Causes the Sequence to perform a Zero calibration/check.
Zero-Lo
Causes the Sequence to perform a Zero and Low (Midpoint) Span
concentration calibration/check.
Zero-Hi
Causes the Sequence to perform a Zero and High Span concentration
calibration/check.
Zero-Lo-Hi
Causes the Sequence to perform a Zero, Low (Midpoint) Span and High
Span concentration calibration/check.
Lo
Causes the Sequence to perform a Low Span concentration
calibration/check only.
Hi
Causes the Sequence to perform a High Span concentration
calibration/check only.
Lo-Hi
Causes the Sequence to perform a Low (Midpoint) Span and High Span
concentration calibration/check but no Zero Point calibration/check.
For each mode there are seven parameters that control operational details of the
SEQUENCE. They are:
Table 7-2: AutoCal Attribute Setup Parameters
Attribute Name
Action
Timer Enabled
Turns on the Sequence timer.
Starting Date
Sequence will operate after Starting Date.
Starting Time
Time of day sequence will run.
Delta Days
Number of days to skip between each Seq. execution.
Delta Time
Number of hours later each “Delta Days” Seq is to be run.
Duration
Number of minutes the sequence operates.
Calibrate
Enable to do a calibration – Disable to do a cal check only MUST be set
to
NO
for instruments with IZS Options installed and functioning.
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