Tecfluid M21 Series - Manual (Page 6)

Metering Tube
1.JAMMED FLOAT (M21/R, M21/N, M21/1, M21/3, M21/5, M21/7)
A special tool is necessary to disassemble the flow meter float (1). This tool can be supplied on
demand by TECFLUID S.A.
This tool fits over the top float guides.
Once the tool is fitted on the top float guides, the nut (3) is unscrewed using a socket spanner. In
this way the nut , the Serrated lockwasher and the bottom float guide can be removed. The float
can be extracted from the top.
With the float removed, it can be cleaned and the inside of the flow meter can also be cleaned.
Clean with suitable products and soft brushes, NEVER WITH METALLIC UTENSILS.
To re-assemble the float (1) in the flow meter, proceed as follows:
6
MAINTENANCE
Indicator housing
If operating anomalies are detected with the meter the following points should be checked. If
necessary disassemble the front cover which is held by four M4 screws.
1.THE INDICATOR NEEDLE (3) RUBS ON THE READING SCALE (1).
This normally happens if the meter is hit or dropped. Simply straighten it out by bending it slightly
until it is separated by between 2-3 mm from the reading scale surface (1).
2.THE INDICATOR NEEDLE (3) DOESN’T READ 0 ON THE SCALE.
For this, the meter should be placed in its real working position on top of a NON-MAGNETIC table.
If when the float is moved the needle moves but does not return to 0, check that the needle hub (4)
is firmly attached to the pointer shaft (2). If it isn’t, secure the needle hub (4) onto the conical tip (2)
of the shaft by tapping it lightly and carefully.
This may have happened during haulage or through the meter being dropped, make the indicator
needle coincide with 0 using the adjusting screw on the indicator needle, screw to left or right
wherever convenient. Make sure that the shaft (2) is held fast so as not to be bent or damaged.
Check that there is no rubbing between the needle movement system and limit switch or
transmitter connecting cables .
This way the flow meter will be properly adjusted to give correct readings.