Manual

8 Maintenance 8-1. Maintenance intervals and items
GD-70 - 62 -
8
Maintenance
This is a critical instrument for disaster-proof and safety.
To maintain the performance of the detector and improve the reliability of disaster-proof and safety, perform
a regular maintenance.
NOTE
To use the pyrolyzer unit (PLU-70), also refer to the individual operating manual.
8-1. Maintenance intervals and items
• Daily maintenance: perform a maintenance before beginning to work.
• Monthly maintenance: perform a maintenance on the alarm circuit (alarm test) once a month.
• Regular maintenance: perform a maintenance once or more for every six months to maintain the
performance as a safety device.
Maintenance
item
Maintenance content Daily
maintenance
Monthly
maintenance
Regular
maintenance
Power supply
check
Verify that the power lamp lights up.
○ ○ ○
Concentration
display check
Verify that the concentration display
value is zero (or 20.9 vol% on the oxygen
deficiency meter). When the reading is
incorrect, perform the zero adjustment
after ensuring that no other gases exist
around it.
○ ○ ○
Flow rate
check
See the flow rate indicator to check for
abnormalities.
○ ○ ○
Filter check Check the dust filter for dust or clogging.
○ ○ ○
Alarm test Inspect the alarm circuit by using the
alarm test function.
○ ○
Span
adjustment
Perform the sensitivity calibration by
using the calibration gas.
○
Gas alarm
check
Check the gas alarm by using the
calibration gas.
○