48
7.1 Routine maintenance
(1) Zero and span calibration
①
Carry out zero calibration with reference to the method in section 5.2.
②
Next carry out span calibration with reference to the method in section 5.2.
③
Zero and span calibration should be made about once a week or when necessary.
(2) Check of flow rate
①
The flow rates for sample gas, standard gas and purge gas are as follows.
• Sample gas and standard gas flow rates
Standard type analyzer
0.5
±
0.25
r
/minute (sample gas)
Sample switching type
(1
r
+1
r
)
±
0.1
r
/minute (Sample gas + reference gas)
Flow differential type
(0.5
r
+0.5
r
)
±
0.25
r
/minute (Sample gas + reference gas)
• Purge gas flow rate: about 1
r
/minute
②
Inspection and maintenance should be carried out about once a day or as necessary.
7.
MAINTENANCE
• When the inner case needs to open for adjustment of the optical system, etc., the inside of
the analyzer and the measuring gas line should be purged completely with zero gas to
avoid poisoning, fire or explosion due to gas leaks.
DANGER
• Before working, take off a wrist watch, finger ring or the like metallic accessories. And
never touch the instrument with a wet hand, Otherwise, you will have a shock hazard.
• Do not use a replacement part other than specified by the instrument maker. Otherwise,
adequate performance will not be provided. Besides, an accident or fault may be caused.
• Replacement parts such as a maintenance part should be disposed of as incombustibles.
CAUTIONS
