A problem common to all turbine flowmeters is that of the turbine “coasting” when the fluid flow
suddenly stops. This is more often a problem in batch processes than continuous processes, where
the fluid flow is regularly turned on and shut off. This problem may be minimized by configuring
the measurement system to ignore turbine flowmeter signals any time the automatic shutoff valve
reaches the “shut” position. This way, when the shutoff valve closes and fluid flow immediately halts,
any coasting of the turbine wheel will be irrelevant. In processes where the fluid flow happens to
pulse for reasons other than the control system opening and shutting automatic valves, this problem
is more severe