6
Radeberger Str. 21; 01900 Großröhrsdorf
Tel. / Fax. 0049 35952- 429465 /- 429457
E-Mail:
; www.dks-engineering.de
5. Requirements for trouble-free operation of the measuring device
In principle, care must be taken to ensure that the gas supply routes to the measuring cell are
as short as possible. Keep in mind that the water molecules are always inclined to attach to
the "inner surfaces".
This effect is more pronounced the larger these surfaces are, this means the greater the
roughness of the pipe wall and the higher the moisture content of the gas. This is a special
feature of the behavior of the water molecules and not a property of the measuring system.
Electropolished surfaces or glass-coated surfaces minimize these effects. Set enough time for
the "flushing of the measuring device" after the initial commissioning and openings, e.g. after
service work.
The measuring cable between the cell and the evaluation device is 2.0 m long as standard.
However, distances of up to 150 m between the measuring point and the evaluation device
are possible. Please contact us about the dimensioning of the cable.
For measurements in explosive gases, an intrinsically safe design of the measurement
arrangement is required. Please contact us about the specific device design required for this!
Before the start of the measurement, the entire system must be checked for tightness and
thoroughly rinsed. Depending on the cleanliness of the plant components and the length of
the gas supply pipes, this process can take several hours, as the moisture components
adsorbed on the inner surfaces must be degraded.
This preparation phase is complete when the value displayed on the device does not change
within about 30 minutes.
