2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
3.12-1
3.12
3.12
Adding on new channels
It is quite easy to add one or two oxygen channels to the instrument. The IR-cell has to be
build in or modified:
IR-source
IR-path
Detector
Preamplifier
Board IR21 with 2 channels
Chopper
With a new IR-cell, the chopper purge system must be installed.
It is very complicated to add a TC cell for nitrogen channels to an oxygen instrument. The
carrier gas changes, a purge and reference flow must be installed. The electronics and
wiring must be modified.
This work should be done in the factory. Otherwise ask for more information.
The following components may be needed, when adding more IR cells:
05257:
Chopper housing, with one IR source and motor
05254:
Chopper housing, with two IR sources and motor
05066:
IR path: oxygen high
05067:
IR path: oxygen low
06005:
Printed circuit board IR 21
06032:
Infrared receiver with CO
2
filter
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