DataRäven Elektroteknik, Munkhagsgatan 82, 587 25 Linköping, SWEDEN, 0765797141, info@foxcomputer.se.

http://zone.ni.com/devzone/cda/tut/p/id/4523 - Sensor Fundamentals
http://www.industrialtext.com/freestuff.htm - Programmable Logic Controllers (PLCs) and Electrical and Motor Controls
http://www.omega.co.uk/literature/transactions/ - Transactions in Measurement & Control Series
http://www.dataforth.com/document.view.aspx?doc_id=770 - Signal Conditioning Tutorial
http://www.tyrrelay.com/pdf/RELAY BASICS.PDF - Relay Technical Information
http://www3.sea.siemens.com/step/downloads.html - Basics of Electricity and Electrical Products 

http://www.panasonic-electric-works.com/peweu/en/downloads/ds_x61_en_relay_technical_information.pdf - Relay Technical Information

http://www.igss.com/download/free-scada.aspx - IGSS FREE50 Download Free SCADA Software