Connect measurement lines
Open all valves at pipe section and 6-tube
manometer, let the water flow for 1 minute
Close flow control cock
Close drain valve of the 6-tube manometer to
vent the measurement lines
Close vent valve of the 6-tube manometer
Close water inlet
Disconnect measurement lines
Open vent and drain valve to discharge level
tubes of the 6-tube manometer
Close vent and drain valves
Open flow control valve slowly
Connect measurement lines again
Open water inlet slowly
Adjust the heights of the water in the manometer
tubes with the help of flow control valve until
water becomes visible
Set the flow rate and the measuring scale with
the inlet and outlet control valves