DESIGN AND ANALYSIS OF AUTOMATIC CALIBRATION OF FLOWMETER

Abstract

This project deals with automating the current “flow calibration method” which is used in many industries that requires more human effort. The device that must be calibrated by automation is a glass tube rotameter. The glass tube rotameter is a variable aperture flowmeter designed to give a visual indication of flow of wide range of liquid and gases.

This device currently used in industries uses a float inside the glass tube which moves to and fro along the axis of the glass tube. The to and fro motion along the axis is according to the flow of the fluid in the glass tube. Automatic recognition of float, automatic signal acquisition and processing is achieved.

Flow sensors, the devices that detect and measure water flowing through pipes. G1/2 Hall Effect water flow sensor is used as a sensing unit with a turbine rotor inside it whose speed of rotation changes with the different rate of flow of water. The Hall Effect sensor outputs the corresponding pulse train for frequency input to the microcontroller. The whole system comprises of AT89S52 microcontroller, G1/2 Hall Effect water flow sensor, relay, optocoupler, a water pump, 5V supply, LCD, keypad and some passive components. The AT89S52 microcontroller is programmed in Keil development Tool.

Experiments are conducted to see how flowmeters can be calibrated with reduces human effort. It is shown by the result of experiments that automatic recognition of float, automatic signal acquisition and processing are to be achieved. It is to meet the industrial field demand of float flowmeter automatic calibration.