Model 400E Ozone Analyzer
Instruction Manual
MAINTENANCE SCHEDULE & PROCEDURES
P/N 04316 Rev: B 205
9. MAINTENANCE SCHEDULE & PROCEDURES
Predictive diagnostic functions including failure warnings and alarms are built into
the analyzer’s firmware allowing the user to determine when repairs are necessary
without performing painstaking preventative maintenance procedures. There are,
however, a minimal number of simple procedures that when performed regularly
will ensure that the analyzer continues to operate accurately and reliably over its
the lifetime. Repairs and troubleshooting are covered in Section 10 of this manual.
9.1. Maintenance Schedule
Shows a typical maintenance schedule for the analyzer. Please note that in certain
environments (i.e. dusty, very high ambient pollutant levels) some maintenance
procedures may need to be performed more often than shown.
NOTE
A Span and Zero Calibration Check (see CAL CHECK REQ’D Column of
Table 9-1) must be performed following some of the maintenance
procedures listed below.
To perform a CHECK of the instrument’s Zero or Span Calibration follow the
same steps as described in Sections 7.2 and 7.3, however, DO NOT press the
ENTR key at the end of each operation.
Pressing the ENTR key resets the stored values for OFFSET and SLOPE and
alters the instruments Calibration.
When performing a ZERO or SPAN CHECK, press the EXIT key to end
the procedure.
Alternately, use the Auto cal feature described in Section 7.6 with the
with the CALIBRATE attribute set to OFF.
CAUTION
Risk of electrical shock. Disconnect power before performing
any of the following operations that require entry into the
interior of the analyzer.
NOTE
The operations outlined in this chapter are to be performed by
qualified maintenance personnel only.
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