Tecfluid M21 Series - Manual (Page 4)

4
HORIZONTAL FLOW
Figure 1 Figure 2
OPERATION
Once the meter is installed, the regulator valve should be opened slowly and the fluid flow will
move the float which, through magnetic coupling, moves the indicating needle.
Any variations of working conditions with respect to those when calibrated can induce
reading errors. The calibration working conditions are indicated on the instrument’s face
plate.
LIQUID MEASUREMENT. (Figure 4)
When measuring liquids the regulation valve should be installed as shown in Figure 4.
The by-pass valve should remain closed. The inlet valve (1) is opened slowly to a position which
would correspond to a low flow rate, then the meter outlet valve (2) is also opened slowly so as to
get rid of the air and then progressively fully opened.
Then, the required flow is regulated by using the inlet valve.
Close the valves during work stoppages or, at the end of the working day to stop sudden
surges when started up. If the float hits the stops sharply this could cause damage to the
meter.
A FILTER PRIOR TO THE METER IS ALWAYS NECESSARY. If the fluid also contains magnetic
particles, which could adhere to the float and jam it, a magnetic filter must be placed at the meter
inlet.
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DOWNWARDS FLOW