Troubleshooting/Errors
Agilent 55B AA Spectrometer User’s Guide
151
9916 Fault: gas pressure sensor
The oxidant pressure in the reservoir is detected when the Ignite button is pressed
but the gas control is shutdown. This is either a control board electronics or
pressure sensor fault.
9917 No oxidant gas pressure
The oxidant pressure in the reservoir failed to reach the required operating
pressure during the ignition sequence or has dropped unexpectedly while a flame
was operating. This error may also be returned while running in Air Only mode.
Possible causes include:
Air or N
2
O gas cylinders empty or turned off.
Faulty pressure sensor.
Faulty gas supply regulation.
9920 Fault: flame detected
When the Ignite button was pressed the flame detector sensed that a flame is
present prior to the ignition sequence. For safety reasons this error will prevent the
flame from being lit. Possible causes include:
Excessive light in the sample compartment.
A faulty flame sensor.
The flame override service switch is in the Flame Sense position.
9921 Flame out detected
After the flame ignition, the flame had been detected by the flame sensor but it is
now no longer detected. This is unexpected as no Flame Off command has been
given. Possible causes include:
The acetylene gas flow may be too low to sustain a flame.
The oxidant flow may be too high to sustain a flame.
The detector may be faulty.
9922 Flame shutdown: gas type
This is an internal system error. If a flame was present this error will cause the
flame to be shut down for safety reasons.
