CALOR 40 Manual Page 24 (total 27) COMAC CAL s.r.o.
Checking the evaluation unit by flow simulator (optional)
CANON connector pinout Cable wiring
Pin 1 - excitation (coil) Black, white - excitation (coil)
Pin 2 - not connected Blue, red - signal from sensor
(electrode)
Pin 3 - not connected Shielding - ground
Pin 4 - signal from sensor (electrode)
Pin 5 - signal from sensor (electrode)
Pin 6 - excitation (coil)
Pin 7 - not connected
Pin 8 - not connected
Pin 9 - shielding (sensor body)
The function of the leads for the existing flow sensor is indicated in brackets.
Meter routine checking:
When checking the meter, it is possible to recognize tentatively the correctness of flow
measurement by replacing the flow sensor with the flow simulator (cable wiring is identical to
that of flow sensor according to colour insulation) and adjust, in successive steps, on the
potentiometer dial, the values that you have written down for given flow rates after
installation of the meter (e.g. 624) and monitor if the displayed reading corresponds to the
reading at the moment of installation (e.g. 42 m
3
/hr). The recognized values should
approximate to the values registered during installation of the meter as much as possible. If
the registered values differ significantly from the recognized ones (by 5 and more per cents),
it will be advisable to have the meter checked in terms of metrology.
Troubleshooting:
- the meter fails to indicate the flow - If the meter with the simulator indicates the flow and
the values correspond approximately to the previously registered values, then there is a
failure in the flow sensor itself. If the meter fails to indicate the flow with the simulator as
well (it indicates 0 or negative values), it is possible that the meter discriminates the
direction of fluid flow, or there is a failure in the evaluation unit electronics. In case that
the meter discriminates the direction, simply swap the excitation wires (white and black
wires) or the electrode wires (blue and red wires).
- the meter "does not keep" zero - If the meter does not keep zero with the simulator either,
there will be a failure in the electronics, if it be to the contrary, the failure will be in the
flow sensor most likely, or the shielding is not connected, or the pipeline is empty, or
some of the valves leaks and water is still flowing through the sensor.
- is it suspected that the meter indicates a higher or lower flow than the correct Q flow - If
the meter with the simulator indicated the values corresponding approximately to the
previously registered values, then the failure may be found in the flow sensor, or the
estimation of the correct flow was wrong and the meter is in order. If it is the other way
round (the values are different from those registered), the failure is in the evaluation unit
electronics.
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