MAINTENANCE
7-10
changes. If the reading changes significantly with the gas,
the UV lamp is actually on. If the UV lamp is on while the
error message persist, then it is necessary to adjust the
lamp threshold (See
Adjust Lamp Failure Threshold
in
Chapter 8.)
It is possible to increase the Lamp Drive power for easier
lamp start-up or to extend the life of the lamp. This is
done by adjusting the LDRV value in Diagnostic Mode
(Chapter 8). For 10.6 eV lamps this value is normally 175
and for 9.8 and 11.7 eV lamps it is set at 200. The value
can be increased up to 225 if necessary, but should be
returned to the standard values when a new lamp is
installed to reduce the power consumption and wear on the
lamp and electronics.
A possible failure mechanism for the UV lamp is a leak
developed along the seal of the glass envelope. When such
condition occurs, the lamp will become very hard or
impossible to turn on and will need to be replaced.
