EC900 Series Operation Manual V4.7
16.0 FAULT MESSAGES/ALARMS
Certain messages may appear on the LED display of the analyzer, either in operation of the analyzer
or during programming.
Thermistor open circuit, most likely cause may be the cell at the rear of the
instrument has become disconnected.
If a flow alarm has been fitted, then a FLO error indicates a flow failure.
When programming new values this display may appear. It indicates the user
is attempting to program a number or value outside a permitted range.
When programming new values this display may appear. It indicates the user
is attempting to program a number or value outside a permitted range.
Automatic calibration fault – indicates an oxygen value outside limits (set under
USB) when Autocal attempted. Requires successful calibration to clear
Indicates cell life below selected alarm level. USB command FLIFE = x.xx
(where x.xx is 0 to 100%, default value is 5%) sets the desired alarm level.
Note. Life indicator updates during calibration.
It is possible to delay the operation of the fault relay contacts following detection of an alarm
condition. The LED display will indicate the fault but the fault relay contacts will only operate following
the selected delay time. This feature can prevent spurious machine stoppages by confirming the fault
exists before operating the relay.
The USB comms command DELAY = x (where x=0 to 255 in seconds), sets the delay time. NB
Default value is 0.
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