PROBLEM SOLVING
This section outlines various warning and error messages which the operator may receive during
general operation of the instrument. For further assistance please contact Technical Support at QED
on +44(0)330 800 0088 or email technical@qedenv.co.uk.
Warnings and Errors
When switched on the instrument will perform a predetermined self-test sequence. During this time
many of the instrument’s working parameters and settings are checked.
If any operational parameters are out of specification or if the pre-programmed recommended
calibration/service date has passed, errors or warnings may be displayed.
Use the ‘Scroll Up’ and ‘Scroll Down’ keys to move through the list if required.
There are two types of warning that may be displayed:
General warnings that may not affect the instrument’s function and those where the self-test
has detected a function that is outside the usual operating criteria, e.g. battery charge low,
memory nearly full.
Operational parameters that could affect the performance of the instrument, e.g. CO
2
out of
calibration.
The most likely reason for these errors is either an incorrect user calibration, or may indicate sensor
failure. If an incorrect user calibration has caused the warning it should be correctable by way of
returning the instrument to factory settings, zeroing or carrying out a user calibration as necessary for
the relevant function.
Under and Over Range Codes
If a reading is over range (i.e. above the maximum allowed reading) it will be displayed with more
than chevrons (>>.>). This can occur if a channel has been incorrectly calibrated or the sample gas
has exceeded its specified range (e.g. CO
2
> 20%).
If a reading is under range (i.e. below zero) it will be displayed with less than chevrons (<<. <). Refer
to section Calibration of this manual to remedy under-range by performing a user zero.
A number displayed as asterisks (**.*) indicates an error, usually where the instrument has been
unable to complete a particular calculation. Typically, this will be the first indication of a fault
condition.
Where no data is available dashes (--.-) are displayed. This usually occurs when a particular reading or
parameter has been skipped by the user, or where an optional accessory is not fitted correctly, i.e. a
temperature probe.
Flow Fail Warning
Occasionally an instrument may report a flow fail that is caused by a blocked or flooded inlet filter,
please refer to ‘section Flow Fail for further information.
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