Manual FLOW 38 Page 7 (total 54) COMAC CAL s.r.o.
If the meter is populated with measuring electrodes only (2 or 3 electrodes located beyond the upper
profile of the tube), it is necessary for proper function of the meter, to fill up the flow sensor with the
fluid to be measured so that erroneous readout of quantity of liquid passing through the meter can be
avoided when the pipe is empty. It is necessary to select the location of the meter in such a way that the
flow sensor aeration can be avoided. In the case of an open system, the flow sensor is placed in the
bottom position of the U-profile pipework, ensuring that the fluid will not flow out of the sensor.
In the case that the sensor is equipped with an empty pipe testing electrode (3rd or 4th electrode in the
upper part f the measuring tube profile), there is no risk of erroneous readout of quantity of liquid passing
through the meter due to aeration of measuring electrodes. This function must be activated in
PARAMETERS (EMPTY TUBE TEST) menu. If it be to the contrary, the same conditions apply as if
the testing electrode is not populated.
The function of empty tube detection in horizontal mounting position
operates correctly only if the evaluation unit is oriented upwards (see Fig.
below). Alternatively, it is not possible to ensure that the activation of empty
tube detection in case of partly filled or empty pipes will take place.
Due to the principle, it is necessary that the maximum
conductivity of medium is 6000 µS for ensuring the
functional evaluation of empty tube. Beyond this limit, errors
may occur in empty tube test, and in this case, it is necessary
to deactivate the empty tube test. If the conductivity of
medium is beyond the permissible range, the meter may,
despite the flooded system, register empty pipeline and the
measurement will not start.
In case of any intervention into the measuring circuit must be accessed like a pipe is fulfilled of medium,
and regardless of the displayed information “empty pipe test” on the display meter !!!
Installation examples
Trouble-free and exact operation of the meter is dependent on its correct location in the system. The
most frequent methods of the placement are shown in the following figures:
Recommended installation locations Downtake pipe
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