Sensors & Transducers Journal
(ISSN 1726- 5479)
Vol. 79, Issue 5, May 2007, pp. 1164-1172
Model Based Evaluation of a Controller Using Flow Sensor for Conductivity Process
P. Madhavasarma, S. Sundaram
Department of Electronics& Instrumentation Engineering
SASTRA University, Thanjavur613402 Tamilnadu, India
Tel.: +91(04362)264101, extn: 262, fax: +91(04362)264120
E-mail: Spms1975@yahoo.co.in, firstname.lastname@example.org
Received: 25 April 2007 /Accepted: 11 May 2007 /Published: 31 May 2007
Abstract: A flow system with varying dead time is experimentally studied and a model generated using step response. Initially an Open loop test is conducted for identifying the process parameters for which the process system used is a helical coil with downstream lag. The process variable namely, conductivity was monitored using Honeywell conductivity sensor. Based on the dynamic response, the Process is represented by a Second order Plus Dead Time (SOPDT) model. PID controller and state feed back controller were studied using the SOPDT model. The data obtained are analyzed and compared with simulated values using MATLAB. The established SOPDT model is fitted to the experimental values with an error of less than three percent. Based on overshoot, rise time, settling time, the present study concludes that the state feed back controller is best suited for this flow process.
Keywords: Conductivity, Identification, Helical coil, Pole placement, SOPDT
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