CALOR 40 Manual Page 23 (total 27) COMAC CAL s.r.o.
If the measured value is out of the given interval and the 230V mains is in order, the power
supply unit is faulty. Its replacement without necessary recalibration is sufficient for the
service.
Flow sensor checking
Necessary measuring instruments and tools:
- cross-head screwdriver
- ohmmeter with at least 3V measuring voltage
Preparatory work
- Switch off power
- Unscrew the top cover of the electronic evaluation unit
- Disconnect the flow sensor from the terminal board
- The flow sensor must be flooded with the measured medium of with water
Measure the resistance
between conductors (white
and black)
If lower, the winding is short-circuited
If higher, the winding is open
Measure the resistance
between the shielding and the
excitation conductors (white
and black)
If lower, a short circuit to ground –
shielding
Measure the resistance
between the shielding and the
electrode wires (red and blue
or red and yellow)
(both of the
measured values
should be
approximately
identical)
If it is lower, empty the sensor and
repeat the measurement, if it is still
lower, then the electrode wires are
short-circuited
If it is higher, the lines from electrodes
are open or the electrodes are dirty
Different values, the electrode wires are
open or the electrodes are dirty
Note: The measurements across the electrodes should not take a long time otherwise
electrodes become polarized and the measurement result will be biased. When the
measurement takes longer, swap the measuring wires across the measured ones so that
polarity is changed (capacitor effect)!!!
If any of the measurement results is wrong, it is necessary to return the meter to the
production plant. When returning the meter to COMAC CAL s.r.o., follow the instructions
given on the last page.
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