Eppendorf Galaxy Gas Analyzer - Manual (Page 39)

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Galaxy® Gas Analyzer — Operating manual
9 Troubleshooting
9 Troubleshooting
9.1 Introduction
This section outlines various warning and error messages which the operator may receive during
general operation of the instrument. For further assistance please contact your local New
Brunswick Scientific sales office or distributor.
9.2 Warning messages
When turned on, the instrument will perform a short pre-determined 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 an incorrect user calibration; it may also 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. If none of these interventions solves the problem, contact
your New Brunswick representative for service.
9.2.1 Under- and Over-range codes
9.2.2 Flow fail warning
A common error is a premature flow fail. This is caused by a blocked or flooded inlet filter.
However, new instruments can go into flow fail prematurely as the pump loosens up over the first
few days of use. For further information (see Flow Fail on p. 21).
9.2.3 Self-test warning messages
For warnings that may be displayed during the self-test period when the instrument is first turned
ON (see Tab. on p. 40):
Warning message Icon Probable explanation
Over-range >>.> 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 %).
Under-range <<.< If a reading is under-range (i.e., below zero) it will be displayed
with less than chevrons (<<.<). To remedy under-range perform a
user zero (see Calibration on p. 33).
Numbers displayed
as asterisks **.* 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.
No data available --.- 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 (such as a
temperature probe) is not fitted correctly.
9
Troubles
hooting