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Getting Started M400E Ozone Analyzer Operator’s Manual
38 04315 Rev. C1
3.7.4.2. Verifying the M400E Reporting Range Settings
While it is possible to perform the following procedure with any range setting, we recommend that you perform
this initial checkout using following reporting range settings:
Unit of Measure: PPB
Reporting Range: 500 ppb
Mode Setting: SNGL
These are the default setting for the M400E analyzer; however, it is a good idea to verify them before proceeding
with the calibration procedure. Use the same method as described in Section 3.6.2.1.
3.7.4.3. Initial Zero/Span Calibration Procedure:
Unlike other versions of the M400E, analyzers with the IZS option installed do not require the expected span gas
concentration be set during initial start-up because no initial span calibration is performed.
3.7.4.4. Initiate Daily Zero-Point Auto-Cal of M400E’s Monitoring Low Levels of O
3
To ensure that the analyzer maintains maximum performance levels when monitoring low levels of O
3
, the
instrument’s AUTOCAL feature (only active on analyzers with the IZS option installed) should be used to initiate
a zero-point calibration once every day.
The appropriate AUTOCAL sequence settings are:
Table 3-9: AUTOCAL Settings for Daily Zero-Point Auto-Cal of M400E’s Monitoring Low Levels of O
3
MODE AND ATTRIBUTE VALUE COMMENT
SEQUENCE 1
Define sequence #1
MODE ZERO
Select zero calibration mode
TIMER ENABLE ON
1
Enable the timer
STARTING DATE 01 – JAN – 03
1
Start running sequence after January
1, 2003
STARTING TIME 00:00
1
Start initial zero-point calibration at
starts at midnight.
DELTA DAYS 1
1
Do Sequence #1 every day
DELTA TIME 00:00
1
Do Sequence #1 at the same time
every day
DURATION 15.0
1
Operate zero-cal valve for 15 min
CALIBRATE ON
The instrument will re-set the slope
and offset values for the O
3
measurement calculation at the end of
the auto-cal sequence
1
While most of the settings required for this sequence are the instrument’s default
settings, and therefore do not need to be changed, they should be verified.
If any of these settings do not match those shown, see the instructions in Section 9.4.
To activate this daily zero point calibration: