In the present paper, the load current of a thyristor driven pump has been utilized as a mass flow sensing parameter of a fluid being lifted by the pump. The motor load current has been sensed by an opto-isolator based circuit and the output of this circuit has been displayed in a PC monitor using Labtech Notebook Pro software. A theoretical equation relating the output of opto-isolator circuit with mass flow rate has been derived and experimental study has been carried out to verify this theoretical equation, assuming the volume flow rate of water at constant room temperature to be proportional to mass flow rate. The experimental results are presented in the paper. It has been observed that the opto-isolator output and the on-line display in PC monitor both vary almost linearly with mass flow rate. Percentage deviation of the experimental results from ideal linearity and repeatability in terms of standard deviation are found to be within tolerable limit. ©2009 IEEE.

S C BERA

N MANDAL

R SARKAR

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

&nbsp;

The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

&nbsp;

It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Study of a thyristor driven pump as a flow indicator

2009 International Conference on Power Systems, ICPS '09

A rotameter is a variable area type flow sensor. It is generally used as a local indicator and display unit. Hence, a special technique is needed to transmit and to display the reading of a rotameter at a remote distance. In this paper, an improved inductance bridge-type technique has been developed to convert the float movement of the rotameter into an electrical current signal, which can be transmitted to a remote indicator. A straight ferromagnetic wire attached to the float of the rotameter acts as a sensing element of the proposed rotameter transducer. The movement of the wire as a result of fluid flow variations inside an inductive pickup coil changes the self-inductance of the coil with the changes in flow rate. An improved inductance bridge network has been used to measure the self-inductance of the coil. It has been observed that the variation of the self-inductance of the pickup coil as well as the variation of the transducer and transmitter outputs with flow rate has a very good linearity and repeatability. The necessary theoretical equations, along with the experimental results, are reported in this paper. © 2014 IEEE.

IEEE Transactions on Instrumentation and Measurement

Design of a flow transmitter using an improved inductance bridge network and rotameter as sensor

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

Design and development of wireless flow transmitter

2008 American Control Conference

Issues in modeling stiction in process control valves

Who Was Who

Longman, Mark Frederic Kerr, (12 Nov. 1916–6 Sept. 1972), President, Longman Group Ltd; Chairman, The Fine Art Society Ltd; Director, Longman Penguin Ltd; Vice-President of the Publishers Association, since 1971

Performance evaluation of a fluid temperature-compensated single sensor constant temperature anemometer

Flow Measurement Handbook

The control of flow through a pipe requires mainly three devices-a flowmeter for the measurement of flow, a control valve to control the flow, and a controller. The controller gives an appropriate signal to the control valve depending upon the difference between the measured flow rate and the set flow rate. Conventional flowmeters produce a differential pressure in the flow, which is measured and suitably scaled to get the flow rate. Incidentally, a control valve uses the principle of restricting the area for flow which in turn produces a differential pressure. From the above, it is seen that if a relationship is developed between the differential pressure produced by the control valve and the flow through it, the valve itself could function as a flow meter also, apart from acting as a control valve. A relationship for this was established based on the equation for control valve capacity (Cv) for different valve positions. The expression requires knowledge of the differential pressure across the valve, the static pressure, temperature, the valve position, and the CVVS valve position characteristics in order to measure and control the flow rate. Error analysis is performed for the expression and to suggest means to improve the accuracy level. An iterative approach is necessary in order to obtain a particular flow rate using this method. This necessitates the use of a computer or a processor-based system, similar to present day intelligent controllers, to implement the scheme. A prototype was made in the laboratory using a 50-mm conventional control valve with pneumatic actuator, working as the control valve and flowmeter. An HP data acquisition and control system (DACS), used as the controller, was also used to provide the appropriate output signal to achieve the necessary flow control. The unit was calibrated at the air flow laboratory to an accuracy of ±1.5%. © 1999 IEEE.

A novel method of using a control valve for measurement and control of flow

Journal	2009 International Conference on Power Systems, ICPS '09
Publisher	-