ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A 151
Monitoring the internal cabinet temperature
Automatic deactivation of internal heaters
As soon as the internal temperature of the analyzer cabinet exceeds the limit
value of 45°C, the analyzer system switches to excess temperature error, and
all internal heaters are deactivated.
Message and status signaling
If the analyzer system is switched to excess temperature error, this is dis-
played on the measurement screen and as a status message (no. 2534).
The digital output 4 of a digital I/O module with the function block applica-
tion ACF5000 cabinet status is set. This normally results in the deactivation
of the air purifier; the valve for bypassing the air purifier is opened. An ex-
cessively high internal cabinet temperature also results in the triggering of
the emergency purging (see page 150). The status message and the emer-
gency purging remain in place until the internal cabinet temperature has
fallen back below the limit value.
Activating heating manually
As soon as the internal cabinet temperature has fallen back below the limit
value, the heaters need to be activated manually again in order to return to
measuring mode. The internal cabinet temperature is reassessed every
30 seconds.
Menu path
MENU → Service/Test → System → Emergency Purging
Procedure
By pressing the ACTIVATE HEATING softkey, the heaters are reactivated.
As soon as all heaters have heated up to values of > 120°C again, the emer-
gency purging (see page 150) can also be confirmed in the same menu.
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