Tecfluid SC250H - Manual (Page 6)

6
5 MECHANICAL MAINTENANCE
Check that the float (5) and the calibrated orifice (4) are in perfect mechanical condition.
They should not have any hit or scrap. Check also that there has been no chemical
attack. If the float is in poor condition, it has to be replaced. If the calibrated orifice is
damaged, the metering tube and the float have to be replaced. In both cases the
flowmeter will need to be re-calibrated.
6 TROUBLESHOOTING
6.1 Metering tube
6.1.1 Jammed float
A possible cause 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 flowmeter 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 flowmeter, 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.
- Chemical dirt adhered to the float and/or to the calibrated orifice. 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.
6.1.2 Lack of magnetic field
Disassemble the float (5) as indicated in point 1. Check if the float has suffered chemical
aggression and if so the permanent MAGNET has been affected. If this is the case, the
float must be replaced and the flowmeter will have to be re-calibrated.