User's Manual

OPERATING INSTRUCTIONS M400E Ozone Analyzer Operator’s Manual
transfer standards may also be used for calibration if they have been certified against the UV calibration
procedure.
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10.1.5. CALIBRATION FREQUENCY
A system of Level 1 and Level 2 zero/span checks is recommended (see Section 10.2). These checks must be
conducted in accordance with the specific guidance given in Subsection 9.1 of Section 2.0.9 (Ref. 11). Level 1
zero and span checks should be conducted at least every two weeks. Level 2 checks should be conducted in
between the Level 1 checks at a frequency determined by the user. Span concentrations for both levels should
be between 70 and 90% of the reporting range.
To ensure accurate measurements of the ambient O
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concentrations, calibrate the M400E at the time of
installation, and recalibrate it:
1. Any time the instrument fails above regiment of Level 1 and Level 2 checks.
2. No later than 3 months after the most recent calibration or performance audit which indicated the M400E
response to be acceptable; or
3. Following any one of the activities listed below:
a) An interruption of more than a few days in M400E operation.
b) Any repairs which might affect its calibration.
c) Physical relocation of the M400E.
d) Any other indication (including excessive zero or span drift) of possible significant inaccuracy of the
unit.
Following any of the activities listed in above, perform Level 1 zero and span checks to determine if a calibration
is necessary. If the zero and span drifts do not exceed the calibration limits in Section 2.0.9 Q.A. Manual (Ref.
11) (or limits set by the local agency), a calibration need not be performed.
10.1.6. DATA RECORDING DEVICE
Either a strip chart recorder, data acquisition system, digital data acquisition system should be used to record
the data from the M400E RS-232 port or analog outputs. If analog readings are being used, the response of that
system should be checked against a NIST referenced voltage source or meter. Data recording device should be
capable of bi-polar operation so that negative readings can be recorded. Strip chart recorder should be at least
6” (15 cm) wide.
10.1.7. RECORD KEEPING
Record keeping is a critical part of all quality assurance programs. Standard forms similar to those that appear
in this manual should be developed for individual programs. Three things to consider in the development of
record forms are:
1. Does the form serve a necessary function?
2. Is the documentation complete?
3. Will the forms be filed in such a manner that they can easily be retrieved when needed?
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