Document No LM0670 Issue A Rev 2 November 2017 Page 10 of 15
sensor is held at the end of the sensor hole.
2. If it is seen that there is no sensor output by the above procedures and it is certain that flow is
taking place, then it is possible that the rotor has become jammed due to the presence of a foreign
body/particle. The sensor output may be a continuous ‘low’ state or a ‘high’ closed contact state
of signal if the magnet is stationary under a reed switch. The meter may be disassembled in the
following manner.
Ensuring that the line pressure is off, and the line is drained as necessary, remove the socket cap
screws of the flowmeter cap (the sensor may be left in place during this procedure). The top cap
can now be removed from the flowmeter body. [In some instances, the rotor is exposed. If not,
the rotor can be accessed by undoing the socket cap screws presented.] It is likely that the rotor
is stuck. Extract the rotor vertically (taking care that the operator is not contaminated with the
process fluid). Observe both the rotor and the rotor chamber for debris or particles. Clean both
the rotor and the rotor chamber. With the rotor free from the flowmeter, the rotor can be placed
against the top cap. Run the rotor in a circular motion to check the output from the sensor system.
Ideally this should duplicate the action of the rotor in its chamber. Having verified that an output
is taking place, the rotor can be replaced in the rotor chamber. Replace the rotor and check that
it oscillates freely. Ensure that the O-ring is undamaged and place it in its groove in the top cap.
Reassemble the top cap taking care to tighten the socket cap screws. If applicable, re-assemble
the top cover, bracket and enclosure.
3. Check that suitable filtration is present in the upstream pipe work to the flowmeter. Employ a
smaller micron mesh filter if necessary.
If appropriate see the separate instruction for the display unit.
WEEE - Waste Electrical and Electronic Equipment
Litre Meter Ltd has a formal product disposal Take-Back and Recycle Program in Europe that complies
with the European Union Directive 2012/19/EU on waste electrical and electronic equipment, also
known as the "WEEE Directive".
This program provides self-service instructions for ease of use product take-back and recycling.
Equipment that is returned through this program will be handled in an environmentally safe manner
using processes that meet or exceed the WEEE Directive requirements. This program is for Litre Meter
customers who have Litre Meter and other manufacturer's flowmeters that have been supplied by Litre
Meter that have reached the end of life.
WEEE - Please contact us to initiate a return request. See our policy on the website.
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