Remark:
Due to a few failures of the flow sensors, almost exclusively with users who analyse samples
with high sulphur and high moisture or regularly treat their samples with acid, we concluded that
the reason of the failures should be of chemical nature i.e. sulphuric acid and other acids
damage the sensor.
The solution is to prevent the analysis gases to get in contact with the sensors. Therefore the
sensor ports are connected with long tubes to the gas flow system. There is no gas flow through
the sensor tubes but only the pressure is sensed by the sensor.
In case of failure of a previous version sensor, it is advisable to replace it by the new version. In
this case the part numbers of the complete assemblies should be used for ordering. In case the
analyzer has already the new version sensor, the order should include the spare part number.
See drawings below and chapter “Ordering numbers”.
: Old flow sensor
Pos: 5.4 /0025 Ü berschriften/ELTR A 1.1 Übersc hriften/11 Infrar ed base line adjustments E LTRA @ 6\mo d_13691219368 36_9.docx @ 41 542 @ 2 @ 1
4.2 Infrared base line adjustments
Pos: 5.5 /0010 ELTRA/0015 ser vice_instructions /CS-2000_ser vice/10Adjustm ents_CS-2000/1 010 Modul I nfrared baselin e @ 9\mod_14 25542384792 _9.docx @ 74574 @ 334434 @ 1
4.2.1 Infrared cell modification - general information
Eltra has changed the IR cell design. This modification makes the cells less susceptible to
contamination problems and makes the calibration more stable. The changes are:
The IR-4 board is modified so that now the output voltage of the cell is adjusted at 8V instead of
zero.
The voltage of each source remains unchanged at 1.75 volts as it used to be.
After this modification the peaks you see on the screen and the output voltage of the IR cell are
two different things.
The Peaks on the screen look the same way like they used to look before starting from zero
(base line) and going up positive.
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