4. INSTALLATION AND COMMISSIONING
Installation and commissioning must be performed by authorized and qualified
personnel.
Connections to main supply (L, N) must be made by means of a protected isolating switch with usual
fuses. As a matter of principle, the General VDE regulations must be complied with (VDE 0100, VDE
0113, VDE 0160). If the potential-free contact is connected to an extra-low safety voltage, sufficient
insulation must be provided for the connecting cables up to the terminal, since otherwise the double
insulation to the mains voltage side may be impaired. The current load capacity of the potential-free
contact is limited to 6 A. Therefore, the circuit of the potential-free contact must be protected with a
6.3 A fuse.
4.1 Installation Conditions
To avoid malfunctions, please observe the following points:
▪The tip of the sensor should be as close as possible to the center of the pipe. If necessary,
determine the area of strongest flow in the pipe cross-section and correct the sensor
position. The through-hole in the shaft of the sensor must be completely inside the duct.
▪There is a small indentation in the metal at the end of the probe. This mark is intended as a
mounting aid and should be placed in the direction from which the flow is coming.
▪For vertical pipes, the direction of flow should be upwards, especially for small air flows (up
to 1 m/s), in order to avoid influences from thermally rising air.
▪The sensor needs ideally 10xD (inside pipe diameter) of free inlet and 10xD (inside pipe
diameter) of outlet path to avoid false measurement due to turbulence.
▪Screw in the flow monitor only via the sensor tube / the hexagon of the sensor housing.
▪Dew formation and contamination in the medium can falsify the measurement result.
▪Check electrical connection.
▪The volumetric meter must be started before the fan (flow generator / compressed air...).
Optimum measurement results can only be achieved if the sensor is installed in the optimum position
and the inlet and outlet distances are observed. At high and borderline temperatures, the radiant heat
of the pipe network can possibly influence the signal output. The device also works despite non-
observance of inlet distances, whereby the reproducibility, accuracy and linearity errors may,
however, have tolerances.
Probe and device are calibrated in pairs and are intended for use together only. Interchanging
can cause malfunctions.
The cable must not be shortened, lengthened or exchanged, this may cause malfunctions. A
longer sensor connection cable is available if required.
The remote probe must not be removed from the device before or during operation.
