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Vol. 84, Issue 10, October 2007, pp.1669-1676




A PC Based Level Indicating Controller Using a Hall Probe Sensor


*S. C. Bera, **B. Chakraborty and D. N. Kole

*Instrumentation Engineering Section, Applied Physics, University of Calcutta

92, Acharya Prafulla Chandra Road, Kolkata - 700 009

**Faculty of Agricultural Engineering, Bidhan Chandra Krishi Viswavidyalaya

Mohanpur, West Bengal, India

Tel.: (+91) 9433791697

E-mail: baduchak@yahoo.co.in



Received: 9 October 2007   /Accepted: 23 October 2007   /Published: 30 October 2007


Abstract: A PC-based measurement and control of liquid level is a very important part of the modern instrumentation system of a process plant in any process industry. In this measurement and control system, the liquid level is measured by using a suitable level transducer. Among the different types of level transducers for measurement and control of liquid level in storage tank the cheapest one is perhaps the float type sensor and the movement of the float with level is generally converted into the movement of a pointer or that of a flapper or that of a potentiometer. In all of these system float is connected with the output device through a mechanical linkage and thus the measurement is subjected to errors due to wear and tear, friction etc. at the mechanical linkage. Here a non-contact float & magnet type level transducer using hall probe has been described in the present paper. A control system has been designed by using thyristor driven pump as the final control element, the speed of which is controlled by the computer through an opto-isolator unit. Experiments have been performed to find the operational characteristics of the transducer and the control loop. The experimental reports are presented in the paper. A very good performance characteristic has been observed.


Keywords: Non –contact level transducer, Float, Magnet, Hall probe, Opto-isolator


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