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Frequency (Pulse) Flow Calculations LIQUI-VIEW

See below the table to calculate the flow or frequency output for the LVB-P models.

ModelMeasuringrange Flow range [m/s]Pressure drop (mbar)Quantity per pulse @50% FSFrequency range unfiltered [Hz}Q0 [l/min]

Kf [(l/min) / f]

LVB-06-P0.5 .. 10 [l/min]0.074 ... 1.474240.00*Q²0.386 ml27 ... 426-0.140.0238
LVB-08-P0.9 .. 15 [l/min]
0.133 ... 2.210
85.00*Q²0.628 ml30 ... 384-0.30.0398
LVB-10-P2.0 .. 40 [l/min]
0.295 ... 5.89522.50*Q²
1.403 ml26 ... 473-0.20.085
LVB-15-P3.5 .. 50 [l/min]
0.290 ... 4.1456.70*Q²
3.047 ml20 ... 272-0.20.1843
LVB-20-P5.0 .. 85 [l/min]
0.265 ... 4.5062.50*Q²
6.213 ml14 ... 227-0.30.3754
LVB-25-P9.0 .. 150 [l/min]
0.283 ... 4.709
0.92*Q²
12.412 ml12 ... 201-0.20.7467

The pressure drop (mbar) calculation formula is for example LVB-25-P (0.92*Q²)/100 in which Q refers to the flow rate in the unit l/min.
0.92*140²=180 mbar dP pressure loss

Legend 

QvVolume flow rate [l/min]
Q0Axis intercept [l/min]
KfCoefficient frequency output [l/min/f]
fFrequency [Hz]
Quantiy/PulseQuantity per pulse [Litres/Pulse]

Characteristic line formula frequency output unfiltered 
QV = Kf * f + Q0

Formula quantity per pulse [litres/pulse] 
Quantity        Kf * QV       
Pulse            60  * (QV - Q0 )

Examples

Need to know the Frequency output for 17 l/min for the LVB-10-P
17 l/min = 0.0850 * f + (-0.2)
17+(0.2)/0.0850 = 202.35 hz

Find the flow with a certain output 112 Hz for example LVB-20-P
QV = 0.3754 * 112 Hz + (-0.3)
(0.3754*112)+(-0.3)= 41.7448 l/min