Tecfluid CP420P - Manual (Page 8)

8
Example 1 - Shortage of volume
If we have a flowmeter body which specifies i/l = 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), then we must apply the following correction:
i/l = Original Pulses per litre Factor
= 1.985
V = Expected Volume = 100
Vr = Real Volume = 95
i/l n = New pulses per litre factor = ? (2.089)
i/l n = i/l
V
Vr
Example 2 - Excess of volume
If we have a flowmeter body which specifies i/l = 1.985, and when we check the volume
of a batch, we find that instead of having 100 litres as programmed, we only have 105
litres (5% more), then we must apply the following correction:
i/l = Original Pulses per litre Factor
= 1.985
V = Expected Volume = 100
Vr = Real Volume = 105
i/l n = New Pulses per litre Factor = ? (1.887)
i/l n = i/l
V
Vr
4 MAINTENANCE
No special maintenance is required.
5 MEASUREMENT ERROR CORRECTIONS
The calibration of the mechanical flowmeters is made with water at 20ºC to obtain a cali-
bration for a liquid of density 1 kg/l and viscosity of 1 mPa·s. If the flowmeter is used with
a liquid of characteristics different than the above mentioned or for reasons of turbulences
in the flow, measurement errors can be induced.
To correct these types of errors we can modify the pulses per litre factor programmed in
the instrument.