ļ 2002 by ELTRA GmbH Germany ā January 2002 ā Service Manual OH 900 / ON 900 / ONH 2000
2.1-4
ws
br
ws
g n
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M3x6
51 3
15210
HCXM050D6H
15195
Senk. M4x25
DIN 963 A2
15125
Remark:
Due to a few failures of the flow sensors, almost exclusively on the ON/OH/ONH at
customers who regularly treat their samples with acid and on ON-900 analysers using
chutzes reagent, we concluded that the reason of the failures should be of chemical nature
i.e. acids and schutzes reagent 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 15210 for block with sensor element and the plate 15125 with two tube coils
15195. The new flow sensor can not be used as a replacement for the older flow sensor
consisting of a rotameter and an optical element.
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