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Fault Detection
General:
NOTE! Fault detection in the electronics and/or replacement of the electronics can be carried
out without releasing pressure on the system or removing the mechanical part of the sensor
Fault
No LED is on / not operating.
Yellow and red LED flash.
Valve open and close to fast.
No contact activation
Delay in sensor activation
The valve is not performing the
control function.
The valve is not performing the
control function well enough.
There is no agreement between
the output signal and the level
in the level indicator.
Practical measurement of output signals:
4-20 mA signal: Function and stability of the 4-20 mA signal can be controlled by connecting a hand-held
multimeter. The output signal must be between 3.6 mA and 22 mA. If not, the electronics are defective.
Sensor Repair
The sensor electronics are completely embedded and can therefore not be repaired.
In case of faults with the sensor, it will typically only be necessary to replace the electronics.
Complaint cases are handled by the HB Products dealers/distributors.
Their complain procedures must be followed before returning the sensor.
Instruktionsmanual - HBLC – Sensor & regulator (012-UK)
WE INCREASE
UPTIME
AND
EFFICIENCY
IN THE REFRIGERATION INDUSTRY
Reason
No supply to the sensor or
defective cable/plug
Power supply is not sufficient.
Refrigerant I boiling in standpipe
There may be dirt between the
electronic housing and the
mechanical housing.
May be caused by gas and
bubbles in the system.
Wiring not done correctly, or
wrong dip switch setup.
Oil has accumulated in the level
indicator glass which cannot
escape.
The sensor is incorrectly
calibrated.
Correction of fault
Check and find faults in the power
supply, or replace the supply
cable.
Install proper power supply.
Increase "filter" settings and
eventually increase P-band as
well.
Separate the two parts and clean
the spring tip. Remember to
apply silicone grease to the spring
tip so as to avoid problems with
moisture
Check if the sensor is placed
optimally so that gas is avoided.
Connect the valve correctly
and/or configure the valve's dip
switches according to the
instructions.
Drain the level indicator of oil
and, if necessary, clean the oil
from the rod.
Perform calibration.
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