62
│ 6 Maintenance
6.4.8
Measuring response time
The response time must be measured manually on a quarterly
basis. Test gas is supplied for this purpose.
Requirement
−
The device is correctly adjusted.
The device is in measuring mode.
1. Add test gas
2. Measure the time t
R
until the measurement value shows 90 %
of the test gas concentration.
The device is in good working order if t
R
≤ (1.2 × t
90
)
6.5
Adjustment
The sensors and the corresponding gases are set by means of
adjustment. To this end, the zero point is adjusted successively
and then the sensitivity to the reference values.
6.5.1
Frequency
It is mandatory to perform an adjustment in the following cases:
● Measurement values outside the specified limit values (
●
Device inspection failed
Only the affected gases need to be adjusted, not the entire de
-
vice.
6.5.2
Features
Note:
Only specialist technicians may perform adjustments.
●
The adjustment of a gas must be performed separately for
each application.
−
The ambient air is used to perform adjustment of the zero
point.
