Connector detailed Guide

Useful Engineering & Technology Websites

Useful Engineering & Technology Websites



These are a selection of some useful web sites voted by our 30,000 subscribers to our FREE Tech Briefs. They have been selected simply on the basis of providing useful, easily accessible technical information either free or for a small charge.



Featured Links

Test-engineers and managers in the electronics industry use our expertise, resources and advice to be more productive in testing and test-engineering: www.testadvance.com

Temperature Controls are Australian manufacturers of Thermocouple, RTD Sensors, Liquid Level Switches and Thermowells. We stock a comprehensive range of Temperature Controllers and Cables to suit all industrial temperature measuring applications: www.temperature.com.au

We provide specialist short training courses for the electronics industry. Our Public course database can be searched by both Topic and Date.

http://www.finda-training-course.co.uk



James Joyce & Associates are consulting Process Engineers, offering design and on-site services for everything from concept development to plant commissioning. www.jamesjoyce.com.au



www.technews.co.za

HazardEx is the brand name for a suite of media products dedicated to the provision of up-to-date information specifically relevant to those companies and individuals responsible or interested in safe working operations within hazardous area environments. www.hazardexonthenet.net

Electrical Products magazine celebrates it's 30th birthday in 2008 and delivers the best product coverage in the electrical market, encompassing all areas; from the smallest cable clip to the largest industrial generator. www.epaonthenet.net

TIM4biz call accounting provides a wide range of reports including abandoned calls, account and authorisation codes, branch, country, department, extension, PABX and trunk traffic, user audit trail and more on a daily, weekly or monthly basis, for single and multiple users, for single and multiple sites. www.tim4biz.com

Registered on - Canada’s National Government Suppliers Directory http://www.govpages.ca



Data Communications and Networking

Voice and Data - the site for the latest in ICT convergence technology: www.VoiceandData.com.au

Details on the ASI bus standard. Click on "What is AS-i" to get detailed technical information: www.as-interface.com

An excellent set of articles on the hardware for data communications. Click on Technical Library to go to these articles: www.bb-elec.com

Details on the Foundation Fieldbus standard: www.fieldbus.org

HF Radio Propagation predictions; Real time ionospheric maps; solar and space weather monitoring - worldwide: www.ips.gov.au

Organization that manages DeviceNet and EtherNet/IP network technology: www.odva.org

Details on the Profibus standard: www.profibus.com

Foundation Fieldbus Wiring and Testing Guide. Look under Fieldbus Resources: www.relcominc.com/fieldbus

An excellent set of articles on HART, Industrial protocols and Fieldbus: www.romilly.co.uk

Electrical

The Electrical Contractor Magazine: www.ecmag.com

Electronics

Electroline: The online meeting place for professional electronics engineering and design: www.Electroline.com.au

EE Times network and useful technical information: www.chipcenter.com

EMC Compliance Journal (mainly EMC related information): www.compliance-club.com

Electronic Engineering Times: www.eetasia.com

Electronics Magazine: www.reed-electronics.com/electronicnews

Vican Electronics: http://vican.ca



Information Technology (IT)

Technology community and e-commerce : http://web.sourceforge.com

Engineers and technicians can download free demonstration software for a wide variety of scientific and technical packages: www.hearne.com.au

Linux Site: www.linux.org

Business Technology IT Magazine: www.techweb.com

Good IT Magazine with useful software downloads: www.zdnet.com

Instrumentation, Automation & Process Control

What's New in Process Technology - Vital information for automation, control and instrumentation professionals across ANZ: www.ProcessOnline.com.au

The comprehensive flow meter source. Click on Submitted Articles for useful information: www.flowmeterdirectory.com

A useful instrumentation and control reference site: www.iceweb.com.au

The IEC Scheme for certification to standards for Explosive Atmospheres: www.iecex.com

IEC 61131-3 Global standard for PLC programming: www.plcopen.org

The best place to learn and experience PLCs: www.plcs.net

A comprehensive set of resources for the world's electrical product safety approval test labs: www.safetylink.com

An interactive repository and guide to temperature sensors on the Web: www.temperatures.com

Instrumentation to monitor and control liquid processes (eg. ultrapure water). Click on Tech. Support: www.thorntonionic.com

Water Measurement Manual. Click on Water Measurement Manual: www.usbr.gov/wrrl

Industrial Safety Talk: http://www.industrialsafetytalk.com

Laboratorytalk: http://www.laboratorytalk.com

Manufacturingtalk: http://www.manufacturingtalk.com





Mechanical Engineering

Data on over 28,500 metals, plastics, ceramics and composites: www.matweb.com

Plant Maintenance Resource Centre: www.plant-maintenance.com

Miscellaneous Sites

American National Standards Institute: www.ansi.org

A cartoon character which appeals to many engineers: www.dilbert.com

National Institute of Standards and Technology. Measurement and standards for US Industry: www.nist.gov

Health and Safety Executive, UK. Click on Information sources for more information: www.hse.gov.uk

Institution of Engineering and Technology (IET): www.theiet.com

Institute of Electrical and Electronics Engineers (IEEE): www.ieee.org

Standards documents, specifications, regulations and parts data on a global basis: www.ihserc.com

Institute of Instrumentation and Control Australia: www.iica.org.au

Institute of Measurement and Control New Zealand: www.imc.org.nz

Institute of Measurement and Control UK: www.instmc.org.uk

Instrumentation, Systems and Automation Society (ISA): www.isa.org

A conversion site for all parameters: www.megaconverter.com

Standards Australia: www.standards.com.au

Time and dates for the world: www.timeanddate.com www.greenwichmeantime.com

Engineeringtalk - A daily updated news source of all Enginering news: http://www.engineeringtalk.com

iCareerHub - A career website to help you get the job YOU want: www.icareerhub.com

We're Listed On The Austin Texas Business List



Project and Financial Management

Project Management resources and the web's most extensive free PM Library: www.4pm.com

Project Management Institute's web site: www.pmi.org

why we use current signal 4~20mA for instrument

We use 4-20 mA signal for intrinsic safety purposes as 4-20 ma signal is weak enough that it can never cause fire from short circuit or spark in hazardous areas where field instruments are installed and where the signal through marshalling rack is coming and going moreover this electronic signal is changed into 3-15 psi intrument air which then operates the process valves located in fieldthe minimum range of this signal is kept 4 mA so that the operation personnel in control room may differentiate between low or no signal means 4 mA is a low signal and 0 mA is no signal(means there is some problem in connection) and we dont increase the range of that signal from 20 mA bcoz the current from above ranges can cause spark from short circuit due to weak insulation thus completing the fire triangle (air, fuel, ignition) the fire will errupt causing infammable objects like ammonia and methane(in fertilzer industry) to explode in un controlled manner and i would like to add that 4-20 mA signal is changed to 1-5 V by using a 250 ohms resistor this volt range also cannot cause spark and is used for data communication with in input and out put modules of DCS or SCADA ur views Refer to all disciplines chemical electronics and computer system




friends why we use current signal?, the simple reason is to prevent the losses due to volage drop if we r transmitting the voltage signals over long distances ,the effective wire resistance could change the actual value

4-20 mA in most cases we use 4-20 mA because the strength of the noise signal is always less than 4 mA. by transmittig the current signal we can greately reduce the voltage drops across the wire.

The Comprehensive Information Resource for Instrumentation, Control, Electrical and Fire & Gas Engineers

This web site contains lot of information Related to Instrumentation.
Person can clear his/her small small doubts about instrumentation by go through the site once.
Recommended Site

http://www.iceweb.com.au/

Hydrocarbon Processing - Subscribe Complimentary Magazine for a year free both printed & Soft copy register it !!!!!!!!!!!!!

Hydrocarbon Processing the premier magazine providing job-help information to technical and management personnel in petroleum refining, gas processing, petrochemical/chemical and engineer/constructor companies throughout the world - since 1922.


http://techxtra.tradepub.com/free/hp/

Online Automation Related books -utilize it

http://www.isa.org/Template.cfm?Section=Books3&Template=/books/books.html

Hart-Transmitter-Calibration

Engineers hand book for hart calibration

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