D-LX 100
Page
21
11. Maintenance and Service
The optics of the Flame Scanner should be regularly checked for dust and debris and cleaned when
necessary. If the outside of the lens regularly accumulates deposits, the purge air flow should be
adjusted to alleviate this problem.
11.1 Replacement of the Shutter and the UV-Photocell on the D-LX 100 UL
The UV-photocell has a limited lifespan. A high pulse rate (> 1000 P/sec) and high ambient
temperatures (60°C) contribute to the loss of filling gases (Gas Clean-up and Diffusion) and the
darkening of the glass tube by sputtering. Both effects contribute to the reduction of sensitivity from
100% at the boundaries of the lifespan, which is defined by 50%.
Under extreme conditions, the lifespan is 10,000 hours, and in the most favorable conditions it is
50,000 hours or more.
The UV-Photocell is replaced in conjunction with the shutter. In order to remove this assembly, simply
detach the four cable connectors.
The layout of the device is displayed in the following illustration:
LX
100
-1
1-
00
4
x1.4 x1.1
x2
x3
PC-board No1
UV cell
connection
Shutter
connection
Twisted cable
to PC-board No2
To PC-board No5
Cabele socket
UV cell
cell holder
Yellow
Blue
Red
Black
(Fig. 14)
Shutter-Block with UV Cell
