LIQUID FLOW SENSORS
Turbine Flow Meter:
The turbine flow meter and it consists of a multi-bladed rotor which is supported in the pipe along with the flow occurs.
The rotor rotation depends upon the fluid flow and the angular velocity is proportional to the flow rate.
The rotor rotation is determines the magnetic pick-up, which is connected to the coil.
The revolution of the rotor is determined by counting the number of pulses produced in the magnetic pick up. The accuracy of this instrument is ± 3%.
It is a simple disc with a central hole and it is placed in the tube through which the fluid flows.
The pressure difference measured between a point equal to the diameter of the tube upstream and half the diameter of downstream.
The accuracy of this instrument is ±1.5%.
LIQUID LEVEL MEASUREMENT
Differential Pressure Sensor:
In this the differential pressure cell determines the pressure difference between base of the liquid and atmospheric pressure.
The differential pressure sensor can be used in either form of open or closed vessel system.
In this method the level of liquid is measured by movement of a float.
The movement of float rotates the arm and slider will move across a potentiometer.
The output result is related to the height of the liquid.