Hach-Lange BUHLER 2000 Water sampler - Manual (Page 42)

Operation
Page 42 Manual Bühler 2000/1029
4.17.4
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MAX. SUCTION TIME
60.0 s
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Limitation of suction time. After expiration of this time, the suction
process is terminated even if no water has been drawn off, that
means that there was no signal from the level electrodes. If this is
the case, a second attempt is made. That means after expiration of
the suction time, the line is purged again and water is drawn off. If
this second attempt fails, too, the message „ERROR SUCTION“ is
displayed which is resulting in a malfunction message (utilizable
signal if an optional relay is installed).
However, the sampler continues to function even after a
malfunction message. The program is not aborted for that
reason!
4.17.6
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PINCH-VALVE OPEN
3.0 s
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Possibility to correct the return time of the valve if it does not stand
straight. This is important for the pinch-valve to close correctly
during a sample extraction.
4.17.7
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PINCH-VALVE PAUSE
2.0 s
**********************
The pinch-valve first only opens 1/3. Here you can input the time
until it opens completely.
This is recommended if distributor variants are installed, as the
biggest part of the sample drains off more slowly. Apart from that,
the sample is discharged more gently.
4.17.9
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CONDUCTIVITY
300
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Adjust the sensitivity of the conductivity electrodes.
However, this value has no dimension!
Make sure that the system is neither adjusted too insensitive (leads
to a flooding) nor too sensitive (there is a permanent signal and thus
no more sample extraction).
A lower value (e.g. 200) means more sensitive or quicker response
of the electrodes.
A higher value (e.g. 300) means more insensitive or slower
response of the electrodes.
4.17.10
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PUMPING CAPACITY
50 %
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Adjust the pumping capacity in %
The adjusted pumping capacity does not influence the suction
height but only the average suction speed when drawing-off the
sample.
The lower the pumping capacity, the longer the service life of the
pump.
4.17.11
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PINCH-VALVE POWER
60 %
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Adjust the pinch-valve power in %.
Modifications should only be carried out by
service personnel!