Teledyne 7500 - Infrared gas analyzer - operating manual - Manual (Page 61)

61 Model 7500 Instruction Manual
Teledyne Analytical Instruments
7. MAINTENANCE
7.1 Daily check
(1) Zero calibration and span calibration
1. It is used for zero point adjustment. For calibration, refer to 6.9.1, Zero calibration.
2. After zero calibration, perform span calibration. For calibration, refer to 6.9.2, Span calibration.
3. Zero calibration and span calibration should be performed once a week, if required.
(2) Flow check
1. Sampling gas flow rate and purge gas flow rate should be as follows;
Sampling gas flow rate: 1.0 L / min ±0.5 L / min (stable)
Purge gas flow rate: About 1L / min
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
Parts to be checked Phenomena Cause Remedy
Every day Recorder indication Lower indication 1. Dust is mixed in
the sample cell
1. Clean sampling
cell and check for
sampling device,
especially gas filter
2. Air is sucked in
anywhere in the
sampling tube
2. Check for leak of
the sampling line
and repair if required
Check for purge gas
flow if purging the
sampling gas flow
instrument
Standard flow rate
is 1L / min. It is not
within the range of
the specified flow
rate of 0.5 to 1.5 L /
min.
Adjust the flow
rate with flow rater
needle valve
Replacement
of Monitor filter
(membrane filter)
Much clogged Primary filter is
damaged
1. Replace primary
filter
2. Replace filter
(paper)
Every week Zero point of gas
analyzer
Out of zero point Zero calibration
Span point of gas
analyzer
Out of the standard
point
Span calibration
Replacement
of monitor filter
(membrane filter)
Irrespective of
phenomena
Replace filter
(paper)
Every year Gas analyzer Irrespective of
phenomena
Overhaul