8 Maintenance, troubleshooting and repair
8.1 Information about fault main‐
tenance
The sensor continuously carries out
self-diagnostic checks. Any errors are
displayed in the bottom row of the dis‐
play.
The sensor has a three-stage fault
detection system:
n Warning
–
A warning is merely a mes‐
sage on the display which
serves to indicate a pending
problem. No alarms are
issued. For example, if the
drying agent alarm is deacti‐
vated and the drying agent is
saturated, the LCD display
shows the following warning:
[DESC]
n Fault
– An error indicates a malfunc‐
tion or problem which can
generally be rectified by the
operator. This includes, for
example, a lamp failure
[LAMP]
or incorrect calibration
[CAL]
. If an error occurs, the
sensor continues to indicate
values, however, the accuracy
of these measured values is
uncertain, meaning that you
cannot rely on the values
given.
n Malfunction
–
A malfunction is a system
error. This problem cannot be
rectified by the operator. The
sensor must be sent back to
the factory for repair. These
faults relate to malfunctions in
the
[CPU]
,
[A/D]
,
[EEPROM]
or other units, which are inte‐
grated into the sensor. In the
case of malfunction, the
device will no longer work cor‐
rectly and the message
[FAIL]
will be shown on the LCD dis‐
play. Both alarm relays are
activated and the current
output is set to 2 mA.
Maintenance, troubleshooting and repair
66
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