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17
MAINTENANCE
17.1
Series M21
To perform the maintenance of the meter, it is necessary to remove some parts of the
flowmeter. Check below drawings for reference.
Models M21-R, M21-N, M21-1, M21-3, M21-7, M21-30
A special tool is necessary to disassemble the flowmeter float (3). This tool can be supplied
on demand by Tecfluid S.A. This tool fits over the top float guide (4).
Once the tool is fitted on the top float guide (4), the nut (1) is unscrewed using a socket
spanner number 5.5. In this way the nut , the lockwasher and the bottom float guide (2) can
be removed. The float (3) can be extracted from the opposite side.
With the float removed, it can be cleaned and the inside of the flowmeter can also be
cleaned.
To remove adhered chemical dirt to the float, the metering tube (6) or the calibrated orifice
(5), clean the parts with suitable products or solvents and soft brushes, never use metallic
tools.
To reassemble the different components in the flowmeter, proceed as follows:
Introduce the float (3) into the top of the metering tube (6) (the thin end should go first). Do
this with care so as not to knock and damage the metering orifice.
Once the float (3) is seated, maintain it in its position using the special tool and turn the
instrument upside down. Using a fine rod of 2 to 2.5 mm diameter (for example a fine
screwdriver) as a guide, slide the bottom float guide (2) and the washer onto the end of the
float. Then mount and tighten the nut (1) using the socket spanner.
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