Turbine flowmeter Operation and Maintenance of Flow Sensor (1)
（1） The flow meter shall be operated as per the flow range and nominal pressure specified in the
certificate of quality as well as the flow direction marked on the transducer.
（2） The process temperature and ambient conditions of the measured liquids shall be in conformity
with the requirements of this instruction manual.
（3） It will supply power to the flow integrating instrument. And in the case that the valve in its downstream
is closed, the flow indicated in the flow integrating instrument shall be zero.
（4） When putting the flow meter into operation, the operator shall first open all bypass valves, then slowly
open the valve in the downstream of the flow meter, and then slowly open the valve in its upperstream till full
opening, and finally slowly close the bypass valves.In case of no bypass valve, the operator may slowly open
the valve in the upperstream of the transducer, and then slowly open the valve in its downstream.Please take
care not to let the impeller reach to a very high speed suddenly.
（5） When measuring liquefied gas and gasoline, the pressure close to the flow meter shall be maintained
higher than the saturation liquid vapour pressure by 0.1MPa, so as to prevent the impeller speed from growing
too high as a result of volume increase at time of liquid gasification, which may result in excessive wearing
of the bearing in a short period.