How to check the hydraulic flow rate of a DualSun solar system?

Checking the hydraulic flow rate ensures that the DualSun solar system is working properly.
To do so, you have to operate the solar control and read the flow rate at the flow meter of the solar station.

With a DualSun SLL solar station

Press the button
Press button (2) to select MAN1
Press button (2) to activate the MAN1 setting
Turn the knob (3) to set MAN1 to MAX
Press button (2) to confirm the setting
Remove the cover of the solar station
Read the hydraulic flow rate using the flow meter (10)
Reading at the upper edge of the flowmeter float, see flow display below
Reset the circulator to AUTO mode
Replace the cover of the solar station

Reading the flow rate on the DualSun solar station

Read the flow rate at the top edge of the flowmeter float.

The flow rate should correspond to the number of panels connected:
Flow rate [L/min] = 1 L/min/panel x number SPRING panels

With a DualSun CS/2 solar station

Press button (1) several times until you reach the end of the scrolling parameters
Press button (1) for a long time
Press button (1) repeatedly until you reach the HND menu
Press button (3) to select the HND menu
Press button (1) or (2) to switch the circulator from AUTO mode to ON mode
Remove the cover of the solar station
Read the hydraulic flow rate using the flow meter (10)
Reading at the upper edge of the flowmeter float, see flow display above
Reset the circulator to AUTO mode in the HND menu
Replace the cover of the solar station

With OEG KSW-E solar station

On the regulation :

Press the OK button
Press the right arrow several times until you reach the “Hand” symbol.
Press OK then press the right arrow once to change R2 = ON
Read the hydraulic flow using the flow meter (8)
Reading at lower edge of flowmeter float.
Reset the circulator to AUTO by pressing the right arrow several times until the “Main” symbol is
reached.
Press OK then press the right arrow once to change R2 = AUTO.
Press “Esc” twice.