BERMAD M10 - Troubleshooting

M10
Instruction Manual
52
7 TROUBLESHOOTING
7.1 MALFUNCTIONING AND POSSIBLE SOLUTIONS
The following table summarizes the possible malfunctions that may occur during the use of the M10 meter,
for which the possible causes and solutions to be adopted in order to restore correct operation of the
flowmeter are listed.
MALFUNCTIONING POSSIBLE CAUSE SOLUTION
The meter shows
a flow rate even
when there is no
flow.
Grounding missing or incorrect. Check that the meter and the liquid are
correctly grounded, making sure that the
relative earth ground connections are
correctly connected.
Lack of liquid in the sensor downstream of
the converter.
Check that the sensor is full of liquid.
Electric conductivity of the liquid is too low,
or it is not compatible with the material
used for the sensor electrodes.
Check which electrode type is used on
the sensor.
If necessary, replace electrodes and/or
sensor.
Missing or incorrect “zero calibration”. Perform manual zero calibration if
necessary.
Cut-o filter value is too low for the process. Increase filter value.
External pulse
totalizer shows
results dierent
than expected.
Pulse output configuration error. Check the pulse volume and pulse
duration settings.
Simulate a flow rate through System >
Simulation and test the output using a
pulse counter.
The screen is
turned o and it
doesn’t turn on.
There is no voltage supply, or it is incorrect. Mains powered: Check the power supply
is 12Vdc
Battery powered: check the battery
life and correct installation, replace the
battery pack.
The flow reading is
very unstable.
Hydraulic nature:
Air bubbles/pockets or unstable flow (vortex
motion). The minimum required linear
distances upstream and downstream of the
device were not complied with.
Check for the presence and correct
installation of vents on the pipe to avoid
the presence of air in the pipe.
Check for the minimum required linear
distances upstream and downstream of
the device.
Electrical nature:
Grounding missing or improperly made,
oxidized nodes, very noisy ground point,
usually in common with the grounding
systems of pumps or inverters, liquid
conductivity is too low.
Change the grounding point or preferably
create a new one for the exclusive use
of the meter.
NOTE: If with full pipe and stable liquid an unstable reading can be observed
(which varies rapidly) then most likely it is a problem of electrical noise.
Only if necessary, set the filters in the following way:

Set the “damping” to 150

Reduce the “peak cut o” filter

Increase the “bypass” filter