Tecfluid TM Series - Manual (Page 9)

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The only parts that may need periodical maintenance are the propeller shaft and bearing.
The rest of the pieces will only need maintenance when there is chemical attack or
abrasion by the fluid being measured.
It has been confirmed that the life of these parts under normal working conditions is longer
than 20.000 hours.
4.1 Disassembly
The numbering of the different elements corresponds to the table and drawing in the
“Parts List” section on Page 10.
Inside the metering tube (1) are located the deflectors (2) (9) and the propeller (6). The
inlet deflector (2) has a stop (4) inserted and the outlet deflector (9) has a shaft (8).
The deflectors are dismounted by withdrawing the circlips (3) which hold them in. They
are mounted at about 5 mm from the ends of the metering tube and are easily removed
with a screwdriver.
Remove the circlip of the outlet deflector. Place the turbine in a horizontal position and
withdraw the deflector. The propeller assembly will come out together with the deflector.
Remove the circlip at the other end and withdraw the inlet deflector.
4.2 Cleaning
The propeller assembly contains the bearing (7) and the tungsten disk (5). These must
not be disassembled.
To clean the inside of the bearing use a cloth or soft paper wrapped around a fine shaft;
do not use abrasive elements. Cleaning liquids can be used to help remove dirt or grease.
To clean the propeller shaft (6) clean with a cloth soaked in alcohol, soapy water or
solvent. The propeller should rotate freely on the shaft but should not be loose. It should
not have a play of more than 1 part in 50 of the shaft diameter.
The rest of the pieces can be cleaned with the same products.
4.3 Mounting
Before starting to mount the turbine make sure that all the pieces are completely dry, with
this we can prevent the propeller shaft from seizing.
The turbine should be mounted as follows:
Slide the inlet deflector (2) in its place (use the flow direction arrow to determine the
correct end) and fix it with a circlip (3).
Fit the propeller assembly on the shaft (8) of the outlet deflector (9).
With the metering tube (1) in a horizontal plane introduce the outlet deflector assembly
and fix it with a circlip (3).
Check that the assembly is not loosen and that the two circlips are correctly seated. There
should only be about 0,5 mm axial play of the propeller assembly on its shaft.
The turbine is ready for installation and operation.
4.4 Pickup
To determine if the pickup group is working properly, the impedance between terminals 2
and 3 of the base connector (14) have to be measured with a multimeter. The value
should be between 1500 and 2500 Ohm.
4.5 Replacing the pickup
The female plug (13), as indicated in the Installation section, can be removed from the
base (14) by unscrewing the larger nut. The male connector base is fixed to the coil
support (11).
Unscrew the female connector in order to separate the cable and after that unscrew the
pickup group from the turbine metering tube (1).
To insert a new pickup group, follow the inverse process.