7 - 1
INZ-TN4ZAFE-E
7. MAIntEnAnCE
7.1 Daily check
7.1.1 Zero calibration and span calibration
(1) It is used for zero point adjustment. For calibration, refer to 6.7.1, Zero calibration.
(2) After zero calibration, perform span calibration. For calibration, refer to 6.7.2, Span calibra-
tion.
(3) Zero calibration and span calibration should be performed once a week, if required.
7.1.2 Flow check
(1) Sampling gas flow rate and purge gas flow rate should be as follows;
Sampling gas flow rate: 0.4L/min±0.05L/min (stable), 1L/min±0.05L/min (high speed re-
sponce)
(2) Maintenance and check should be carried out every day, if required.
7.2 Daily check and maintenance procedures
Table 7.1 Maintenance and check list
Dust is mixed in the
sample cell.
(1)
(2)
(1)
(2)
(2)
(1)
Standard gas is not
withinthe range of the
specified flow rate of
0.45 to 0.35 L/min or
0.95 to 1.05 L/min
(high speed responce).
Much clogged
Out of zero point
Out of the standard
point
Irrespective of
phenomena
Irrespective of
phenomena
Lower indication
Replacement of
membrane filter
Zero point of gas
analyzer
Span point of gas
analyzer
Every week
Every day
Every year Gas analyzer
Recorder indication
Air is sucked in
anywhere in the
sampling tube.
Overhaul.
Replace filter (paper).
Span calibration
Zero calibration
Adjust the flow rate with
flow rater needle valve.
Replace primary filter.
Replace filter.
Check for leak of
the sampling line
and repair, if required.
Clean sampling cell
and check for
sampling device,
especially gas filter.
Remedy
Cause
Phenomena
Parts to be checked
Sampling gas flow
instrument.
After overhaul.
Gas analyzer output
Instrumental error test
Replacement of
membrane filter
