Modern Temeperature Transmitters

one thing that has caught my eye recently has been EDDL. The technology is jus going great guns, as Jonas Berge recently put up an article Temperature Transmitters: Warming Up To EDDL. You may recall him from my earlier posts. Jonas is a senior PlantWeb consultant at Emerson Process Management.
Temperature transmitter use a variety of protocols today includind wirless HART and Foundation Fieldbus. As Jonas rightly puts it "Supporting this mix of transmitters can be a challenge. However, modern temperature transmitters diagnose themselves, the sensor wiring, and the temperature element."
These have greatly helped in maintaining the loops and has got the plants running more effectively. A burnout in the TT can burn a deep hole in the customers pocket. With the use of EDDL we can easily switch through the dynamic displays and get into the problem immediately. The two important diagnostics discussed are sensor drift and hot backup.
Jonas discusses sensor drift alert as "A sensor with dual sensing elements at one measurement point takes two readings that are compared and if a maximum difference is exceeded, the diagnostics determines that drift has occurred." This gives more insight to the operator as it directly shows the diagnostics on the operator consoles.
Another important advanced diagnostic is the hot-backup. "For this, two sensors measure the same point. In normal operation the reading of one sensor is used, but if the primary sensor fails its value is discarded and the backup sensor reading is used." This is pretty well important.
Even the handheld communicators are designed by the same EDDL technology providing the technicians advanced troubleshooting and of-course they are even offered help by EDDL wizards to make there job easy!!
Those inerested can surely go through this wonderful article by Jonas Berge on www.iaasiaonline.com [Home --> Instrumentation & Measurement]

pressure transmitters...the EDDL way!

Pressure transmitters have evolved much in the several years.These transmitters specialise in areas such as DP Flow, Mass Flow, Safety Certified, and Diagnostics and have been recently talked about by Dale Perry, pressure product manager and Jonas Berge, senior PlantWeb consultant, Emerson Process Management.
They quote "The next frontier of making pressure transmitters easy to use was the display used to start-up, maintain, calibrate, and troubleshoot. Historically there was no display standardisation. The dilemma was that the pressure transmitter manufacturer could not dictate the system display or accessible transmitter functionality on a system"
EDDL has come a long way in the process of evolution. We can have a display which completes removes the complexity of a pressure transmitter, thus making it simple to use.

Both Dale and Jonas write "Before enhanced EDDL there was no graphics for quick visualisation of the pressure transmitter diagnostic status nor could you look at the current PV and tell what the pressure was two minutes ago. And if the device had multiple variables there would be multiple numbers to look at and do math and correlation in your head."

All this has now become easy with EDDL (Electronic device description language) standard IEC 61804. Finally Dale and Jonas write "EDDL is the key to interoperability in a digital plant architecture".....very true indeed.

You can find the complete article 'Pressure Transmitters: EDDL Equals Easy' on http://www.iaasiaonline.com/?pname=news&nc=im&nid=173.
very interesting and informative read....