328 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
No. Text S A
F Reaction/Remark
373 The flow sensor signal outside
permissible range.
x
374 No measurement. The detector
signal is too low.
x x The laser beam does not reach the detector. Clean opti-
cal window. Check optical beam path for obstacles and
realign optics.
375 The input current loop
(4-20mA) has an error.
x x Error when entering pressure and/or temperature via
4–20-mA input. The measured gas concentration is most
likely incorrect. Check connections to the tempera-
ture/pressure sensor or use fixed settings for tempera-
ture or pressure respectively.
376 This LS25 module is undergoing
maintenance.
x x Communication with service software via RS232. No
measured values are transferred.
Uras
378 The chopper wheel is blocked. x x Notify Service.
379 Chopper wheel speed not OK. x x Notify Service.
380 IR source element or electron-
ics defective.
x x Notify Service.
381 High voltage in the preamplifier
defective.
x x Notify Service.
382 Meas. value is influenced by
shock.
x x
Flow controller
398 No new measured values from
the analog/digital converter.
x x Notify Service.
399 The measured value overshoots
the range of the analog/digital
converter.
x x Check the sample gas concentration. Check connectors
in the gas analyzer. Notify Service.
400 A calculation error occurred
during calculation of the meas-
urement value.
x x Notify Service.
401 The flow rate exceeds upper or
lower limit value 1.
x Check sample gas path. Notify Service.
402 The flow rate exceeds upper or
lower limit 2.
x x Check sample gas path. Notify Service.
403 The flow regulator controlled
variable is out of the valid
range.
x x Notify Service.
ZO23
404 Temperature is above or below
upper and/or lower limit value
2.
x x Notify Service.
405 A ZO23 function test has been
performed.
For information
406 This ZO23 analyzer has failed
the function test!
x Change test factor or check sample cell with test gas.
407 A ZO23 function test is in pro-
gress.
x For information
408 The ZO23 function test is can-
celed!
x Keep sample gas concentration stable or use test gas.
Fidas24
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