2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
3.1-1
3
3
Servicing
3.1
3.1
IR paths, cleaning and replacing
Unscrew and remove the tubes ( 1 ) from the IR paths.
Remove the nuts ( 2 ) ( Size: 7 ) in doing this, the screw thread ( 3 ) should be held
tight to prevent it from turning with the nut.
Take out the pre-amplifiers ( 6 ) together with the distancing box ( 7 ).
Clean the paths with a cleaning solution, e.g., ethanol.
With a two part path, such as ( B ), the windows can be cleaned on the inside by the
use of a cotton swab.
With single part path, such as ( A ), the path is filled with ethanol and, after a few
minutes, oxygen is blown into the empty path and will dry it out.
Soiling which can accumulate from the analyses of materials that contain a lot of
sulphur and moisture, or hydrogen can be very difficult to clean. In such cases, the
paths should be replaced.
Before reassembling the paths, the screws ( 3 ) should be screwed in by hand in order
to ensure that they are screwed into the holes.
Assembly of the paths follows is made in reverse order from the removal.
After reinstallation, adjustments according to 2. 3 are recommended in all cases.
If the plugs ( 17 ) of the pre-amplifiers ( 6 ) are to be replaced, see 2. 3
1
6
6
13
14
15
11
12
9/10
8
3
2
7
3
17
17
A
B
3-1-1
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