bullet Sensors & Transducers Journal

    (ISSN 1726- 5479)


2008 e-Impact Factor

25 Top Downloaded Articles

Best Selling Articles 2012

Journal Subscription 2013

Editorial Calendar 2013

Submit an Article

Editorial Board

Current Issue

Sesors & Transducers journal's cover

Sensors & Transducers Journal 2011

Sensors & Transducers Journal 2010

Sensors & Transducers Journal 2009

Sensors & Transducers Journal 2008

Sensors & Transducers Journal 2007

2000-2002 S&T e-Digest Contents

2003 S&T e-Digest Contents

2004 S&T e-Digest Contents

2005 S&T e-Digest Contents

2006 S&T e-Digest Contents


Best Articles 2011




Vol. 150, No. 3, March 2013, pp. 32-39




Design and Development of a Pressure Transmitter Using Modified Inductance Measuring Network and Bellow Sensor


1 Venkata Lakshmi Narayana K. and 2 Bhujanga Rao A.

1 School of Electrical Engineering, VIT University, Vellore-632 014, Tamilnadu, India

2 Department of Instrument Technology, Andhra University, Visakhapatnam -530 003, India

E-mail: kvl007in@yahoo.co.in, dr_abrao@yahoo.co.in



Received: 6 January 2013   /Accepted: 19 March 2013   /Published: 29 March 2013

Digital Sensors and Sensor Sysstems


Abstract: In this paper, a pressure transmitter using a modified op-amp based network for inductance measurement using a bellow as sensor has been proposed to measure the pressure and to convert pressure changes in to an electrical current which can be transmitted to a remote indicator. The change in inductance due to change in pressure is measured by an improved modified operational amplifier based network. The proposed network permits offset inductance compensation of sensing coil and also minimizes the stray capacitance between sensing coil and ground using dummy inductor whose value equal to zero level inductance of sensing coil and op-amps with high input impedance. In the first part of experiment, a modified op-amp based inductance measuring circuit has been simulated using LabVIEW (Laboratory Virtual Instrument Engineering Workbench) and studied with test inductance, and in the second part, the experimentation was done by replacing the test inductance with a sensing coil fitted to bellow by means of ferromagnetic wire for the measurement of pressure. It has been observed that the variation in gauge pressure from 0 to 70 psi having linear relationship with output ac voltage in the range of 0 to 85.0 mV. Corresponding to pressure variations, the ac output voltage further converted into an electric current of 4 to 20 mA for remote indication and control purpose. The investigations have been performed to sense air pressure of pressure tank fitted with pump piston. The experimental results are found to have good linearity of about 0.1 % and resolution.


Keywords: Bellow, LabVIEW, Inductance measurement, Differential amplifier, Virtual Instrument, Pressure Transmitter, Linearization


Acrobat reader logo Click <here> or title of paper to download the full pages article in pdf format



Read more about Pressure Sensors






1999 - 2018 Copyright , International Frequency Sensor Association (IFSA). All Rights Reserved.

Home - News - Links - Archives - Tools - Voltage-to-Frequency Converters - Standardization - Patents - Marketplace - Projects - Wish List - e-Shop - Sensor Jobs - Membership - Videos - Publishing - Site Map - Subscribe - Search

 Members Area -Sensors Portal -Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Submit Press Release - Submit White Paper - Testimonies - Twitter - Facebook - LinkedIn