Environnement AF22e, Technical Manual, Page: 102 / 118

Environnement
S.A
AF22e
Duplication prohibited
APRIL 2016
5–4
Table 5–1 – List of faults and corrective actions
Alarm message
(Min./Max. values)
Possible cause(s) Possible corrective action(s)
DAC out of range
Min. value: 0 point
Max. value: 4095 points
–
Current measurements exceed the
set DAC range.
– Measurement offset is too high or
too low.
– Calibration factor is incorrect.
–
Set a DAC range complying with the
current measurements.
– Check and change offset setting.
– Check and correct calibration factor
setting.
Out of Range
Min. value: 0 ppm
Max. value: 10 ppm
– SO
2
concentration exceeds the
analyzer specification range.
– Zero-reference cycle is not
performed correctly (example: span
gas is used instead of zero).
– Decrease SO
2
concentration by
dilution.
– Check zero filter and zero-reference
cycle setting. Then, perform a new
zero-reference cycle.
Zero filter outdated
Min. value:
Max. value: <10 days
–
Internal zero filter has reached its
lifetime.
–
Lifetime countdown of internal zero
filter is incorrect.
–
Replace internal zero filter and reset
lifetime countdown to 180 days.
–
Reset lifetime countdown to 180 days.
Calibration Fault
Min. value:
|
∆
K/K| >50%
Max. value: N.A.
–
Calibration cycle was not performed
with span gas.
– Calibration cycle duration is too
short.
– Previous calibration is not performed
correctly.
–
Check span gas cylinder connection
to analyzer span gas inlet.
–
In the « Metrology configuration »
screen, check setting of « Span gas
value » fields indicating span gas
concentration connected to analyzer
span gas inlet port. Then, validate
former calibration coefficient value.
Finally, perform a new calibration
cycle if necessary.
–
In the « Automatic cycle configuration
» screen, check calibration cycle
duration: recommended duration is
600 sec. Change if necessary.
– Calculate calibration coefficient using
formula: K
new
= K
former
(1+
∆
K/K) and
correct in « Metrology configuration »
screen. The analyzer is now in alarm
mode. Launch a new calibration cycle
if necessary.