Omini o
perator’s
manual
version :19.04.17
14
7.4
M
AINTENANCE PROCEDURES
Flow measurement procedure
7.4.1.1
General points
The flow measurement is interesting to check the filters and reverse osmosis membrane plugging
state.
The osmosis membrane flow is function of the supply water temperature.
We generally allow a flow drop of 3 % per Celsius degree in a range from 10 to 25 °C.
This flow measurement must be compared to the water purifier theoretical nominal value with a
fixed temperature, which is 25 °C:
Note: this theoretical flow rate represents the production at a "tank outlet" pressure of zero bar; it
decreases according to the increase in the pressure "Outlet tank".
7.4.1.2
Equipment
1.
A graduated test tube of 500 mL.
2.
A chronometer.
7.4.1.3
Operating method
1.
Close the storage water hand valve..
2.
Open the water purifier exit hand valve and let flowing 30 seconds to get a stabilized flow.
3.
Trigger the chronometer as soon as the test tube is filling. Make a measurement on 1 or 2
minutes.
4.
Convert the result into liters/hour. Compare this measurement to the theoretical value.
Theoritical production flow variation / supply water temperature
0
10
20
30
40
50
60
70
5
10
15
20
25
30
Temperature °C
P
u
ri
fi
e
d
w
a
te
r
fl
o
w
L
it
e
rs
/
h
o
u
r
