Tecfluid MT03F - Manual (Page 28)

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13 WORKING SCREEN
When exiting the menu, the display shows the working screen. To scroll between the six
operating screens, press the key (Down / Left) or (Up).
14 MAINTENANCE
No special maintenance is required .
14.1 Fuse
The device has a Ø5 x 20 mm fuse as a protection at power supply input. The fuse rating
depends on the nominal supply voltage.
In the event that the fuse blows, this should be replaced with one of the same value.
15 MEASUREMENT ERROR CORRECTIONS
The obtaining of K factor of the flowmeters is performed by water at 20 o C whereby a
factor for a liquid of density 1 kg/l and viscosity of 1 mPa·s is obtained. If a liquid is used
with different characteristics from the above specified, measurement errors can be
induced.
To correct these errors the K factor can be modified in the installation menu (see page
17).
Example 1 - Shortage of volume
If we have a flowmeter which specifies K (pulses/litre) = 1.985, and when we check the
volume of a batch, we find that instead of having 100 litres as programmed, we only have
95 litres (5% less) we have to apply the following correction:
Fk = Original K factor = 1,985
V = Expected volume = 100
Vr = Obtained volume = 95
Fk n = New K factor = ? (2,089)
Fk n = Fk
V
Vr
Fk n = Fk
V
Vr
Example 2 - Excess of volume
If we have a flowmeter body which specifies K (pulses/litre) = 1.985, and when we check
the volume of a batch, we find that instead of having 100 litres as programmed, we have
105 litres (5% more) we have to apply the following correction:
Fk = Original K factor = 1,985
V = Expected
v
olume = 100
Vr = Obtained volume = 105
Fk n = New K factor = ? (1,887)