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EPA Protocol Calibration
To ensure accurate measurements of the ambient O
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.
8.1.6. 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.
8.1.7. 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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Model 400E Ozone Analyzer
Instruction Manual
concentrations, calibrate the
3
P/N 04316 Rev: B
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