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Maintenance/inspection item
Monitoring of sample flow rate
Monitoring of conditioner bubbling quantity
(Note)
Conditioner
Air aspiration tube level
Procedure
Prescribed flow rate: The flow rate is normal when the ball is at
0.4N/min. and there is slight bubbling at the bottom of conditioner.
Adjust the needle valve so that a flow rate of 0.4N/min. is available.
If the prescribed flow rate is unobtainable even with the needle valve
fully open though there is slight bubbling, then the capillary (sample
line) should be checked for clogging. In case there is no bubbling, the
aspirator, conditioner, electronic cooler and pipe should be checked for
clogging. And if water decreases in the conditioner because of heavy
bubbling, the capillary of bypass line should be checked for clogging.
Good if H2 level shown in Fig. 10-1 is longer than 100mm.
If air is aspirated through the air aspiration tube, then the pressure loss at
the stage before the conditioner filter has become large. Check the gas
extractor filter (see (1) in 10.5) and gas pipes for clogging.
10. MAINTENANCE
Danger
• When handling standard gas such as calibration gas, read the instruction manual for the standard gas for
correct handling. Special care should be taken when handling hazardous gas such as CO gas and the like
to prevent poisoning.
• During maintenance or inspection, be sure to turn ON the ventilation fan in the analyzer to prevent
poisoning due to gas leakage.
• When the gas filter of the analyzer is to be replaced or the washing unit needs maintenance, be sure to
close the calibration gas valve. Especially, if the calibration gas valve is located at the sample gas inlet,
the replacing or washing shall be done after closing the calibration gas valve to prevent poisoning or
other trouble.
Caution
• The gas converter is heated to about 220°C. When the catalytic agent needs to be replaced, turn OFF the
power for the converter and use heat-proof gloves about 30 minutes later.
• When the fuse is blown off, check the cause of it and replace it with the same type of fuse having the
same capacity to prevent electric shocks or other trouble.
• When the analyzer is provided with a power leak relay, press the test button to confirm proper operation
before making maintenance or inspection to prevent electric shocks.
• Be sure to lock the door. Do not allow unauthorized persons to use the door key. Do not touch the door
carelessly to prevent electric shocks and other trouble.
The following items must be observed to prevent electric shocks or injury and to ensure safety.
• Take off metallic objects such as wrist watch before starting the work.
• Do not touch the device with wet hands.
10.1 Routine maintenance and inspection