Frequency (Pulse) Flow Calculations LIQUI-VIEW
See below the table to calculate the flow or frequency output for the LVB-P models.
| Model | Measuringrange | Flow range [m/s] | Pressure drop (mbar) | Quantity per pulse @50% FS | Frequency range unfiltered [Hz} | Q0 [l/min] | Kf [(l/min) / f] |
|---|---|---|---|---|---|---|---|
| LVB-06-P | 0.5 .. 10 [l/min] | 0.074 ... 1.474 | 240.00*Q² | 0.386 ml | 27 ... 426 | -0.14 | 0.0238 |
| LVB-08-P | 0.9 .. 15 [l/min] | 0.133 ... 2.210 | 85.00*Q² | 0.628 ml | 30 ... 384 | -0.3 | 0.0398 |
| LVB-10-P | 2.0 .. 40 [l/min] | 0.295 ... 5.895 | 22.50*Q² | 1.403 ml | 26 ... 473 | -0.2 | 0.085 |
| LVB-15-P | 3.5 .. 50 [l/min] | 0.290 ... 4.145 | 6.70*Q² | 3.047 ml | 20 ... 272 | -0.2 | 0.1843 |
| LVB-20-P | 5.0 .. 85 [l/min] | 0.265 ... 4.506 | 2.50*Q² | 6.213 ml | 14 ... 227 | -0.3 | 0.3754 |
| LVB-25-P | 9.0 .. 150 [l/min] | 0.283 ... 4.709 | 0.92*Q² | 12.412 ml | 12 ... 201 | -0.2 | 0.7467 |
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 | |
|---|---|
| Qv | Volume flow rate [l/min] |
| Q0 | Axis intercept [l/min] |
| Kf | Coefficient frequency output [l/min/f] |
| f | Frequency [Hz] |
| Quantiy/Pulse | Quantity 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