Tecfluid SC-250 - Manual (Page 10)

10
Metering Tube
1. JAMMED FLOAT
The possible cause in DN-15 to DN-80 floats (5) is that the top central guide rod (3) or the bottom
one (6) is bent by a water hammer. To solve this, extract the float (5) from the flow meter removing
the circlip (1) which locks the top float stop (2). Next remove the float stop (2). The float can now
be extracted. Align the guide rods and manually check that the movement is good without rubbing.
To re-assemble the float again in the flow meter, reverse the aforementioned process.
With the DN-100 to DN-150 floats (5), the cause can be that the lateral guide rod is bent or dirty.
To solve this, extract the float (5) from the flow meter removing the screw (8) which holds the float
end (7). Next remove the float end. The float can now be extracted from the top of the flow meter.
Straighten or clean the guide rod.
To re-assemble the float again in the flow meter, reverse the aforementioned process.
Apart from this, the float can jam for other reasons:
Accumulated metallic dirt due to the float magnetic field. In this case dismount the float (5)
following the aforementioned instructions, clean it and, at the meters inlet, install a magnetic filter
or a normal one depending on the size of the particles.
Adhered chemical dirt. Clean with suitable products or solvents and soft brushes, NEVER WITH
METALLIC UTENSILS.
Top float stop (2) bent by water hammer. If it is possible, straighten it and check alignment.
Otherwise change it for a new one.
2. LACK OF MAGNETIC FIELD
Disassemble the float (5) as indicated in point 1. Check to see if the float has suffered chemical
aggression and the permanent MAGNET has been affected. If this is the case, the float must be
changed and the flow meter will have to be re-calibrated.
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