COMAC CAL FLOW 45 Installation And Technical Conditions page 8

The opposition of the holes in the counter-flanges for the bolts should be ensured in the same manner
and a sufficient room behind the flanges should be available for the bolts and nuts so that the actual
installation of the sensor in pipeline and its attachment with the bolts is made possible.
The manufacturer recommends using an intermediate piece during welding. It is absolutely excluded to
use the flow sensor as an intermediate piece due to thermal damage. The welding current must not run
through the flow sensor during electrical welding. The installation of the flow sensor is carried out after
welding, coating, building and similar works are completed.
The actual installation is performed by the fixation between the counter-flanges that are welded to the
calming pipeline (5×d before and 3×d in the direction of flow) whereas the liquid must run through the
flow sensor in the direction indicated by the arrow on the sensor name plate.
During installation, do not lift the meter by the evaluation unit housing (in case of detached design, by
the sensor terminal box), possibly under the meter's metallic housing but always use slings round the
process connection or use the lifting lugs on the flanges.
Installation position
The inductive flow sensor is installed in arbitrary position in vertical piping. In case of horizontal piping,
it is necessary to make sure that the sensor is installed with its measuring electrodes in horizontal
position. In case of the earthing electrode design, possibly with testing for empty pipeline, then the
installation is always performed with the earthing reference electrode facing down (with the sensor
terminal box, eventually with the evaluation unit facing upwards). Then the earthing reference electrode
is in the bottom position and the empty tube sensing electrode is in the top position of the flow sensor.
Every time when the empty tube testing electrode is not covered
with a liquid for 5sec at least, the flow meter will display the
"Empty tube" status, and if it is necessary, it sends out an error
message and stops taking measurement. The measurement
accuracy is maintained in this way. Once the electrode is
covered with the liquid again, the error message disappears and
the flow meter starts taking measurement again.
Manual FLOW 45 Page 8 (total 28) COMAC CAL s.r.o.