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SDI-12 based turbidity measurement system with field calibration capability

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4 Author(s)
Pereira, J.M.D. ; ESTSetubal, Setubal, Portugal ; Postolache, O. ; Girao, P.S. ; Ramos, H.

Turbidity is a measure of how much the material suspended in water decreases the passage of light through the water. In order to carry out accurate turbidity measurements, turbidity-measuring probes require periodic calibration. Classical calibration implies manual. procedures characterized by long calibration time, additional common errors and lower repeatability. The paper presents a distributed turbidity measurement system with field calibration capabilities. The main system elements are turbidity probes, one calibration unit RS232 compatible, three RS232 to SDI-12 converters and a notebook PC. The acquisition and control tasks of the turbidity measurement probes and field calibration unit are implemented using a microcontroller (PIC16F877).

Published in:

Electrical and Computer Engineering, 2004. Canadian Conference on  (Volume:4 )

Date of Conference:

2-5 May 2004