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I have to agree with Ashereng - instrument techs need to be brought out of the dark ages and told to leave their flapper nozzles alone. There is definitely a learning curve with new technology but I am not sure that it is really so steep - if you trust these guys to look after critical...

I can't believe there are electricians out there who think that ground (that bit you stand on) is an effective conductor for the purposes of personal protection or that the neutral can be 'ditched' - I'd hate to wash my hands i his house just in case he'd wired up the tumble dryer. Hasn't anyone...

Hawke International are the people, a UK company. Bill Hawke invented what we today call the compression seal cable gland. No one uses naval brass anymore and those who think they do, have something else. Brass cable glands with nickel-plating are very common offshore and elsewhere (even if some...

You can download the FM standard 3610 or 3611 which both have Ignition curves as Appendices. 5A would be safe at 7.5V in all Gas Groups but so severely limited as far as connected cable inductance is concerned that empirical testing is the only practical way forward unless everything was...

Triconex (part of Invensys) have a series of white papers on SIL levels available on their website. They are also featured in this e-magazine: http://www.controlglobal.com/wp_downloads/triconex_truth_4and5.html

Thanks for that - question posted over there!

Does anyone know any US plants that have adopted Zones for hazardour location approvals? For hazardous areas in Europe and RoW, plants are usually classified into Zones (0/1/2) to IEC standards, whereas in the US, plants are classified into Div1/Div2 to NEC500. The latest update to the NEC adds...

Years ago, Europe had Zones (0,1,2) for hazardous areas and the US had Divisions (1,2) under NEC500. They were not identical and of course, local preferences led to divergence in methods of installation: Increased Safety (Exe) is very popular in Europe and Flameproof is very popular in the US...

Safety was not really the issue here, but since we've started.... TUV approval has been granted for ProfiSAFE and for the software protocol called FF-SIS. ProfiSAFE allows the conjunction of safety related and non-safety related instrumentation within the same system and on the same hi-way...

I used to design surge protection units for instrumentation use and at that time (some years ago) we had Schaffner surge generation equipment. Think it was a NSG6501, but I don't know is those things are still available. Aonother company doing similar stuff is Hipotronics.

Relaibility is such a little word to cover so many meanings. If you mean; does the equipment (instruments & devices) fail more because they are 'fieldbus' over 4/20mA or HART, then the fact that Yokogawa and the rest are now offering life-time warranties suggests that they don't...

Burkert (manufacturer) and Wago (reseller) offer a FB unit that provides 8x DIN and 4x DO, under FF H1 or Profibus PA. That means they are bus-powered at 16mA, with a minimum of 17V . I have to say, it's not clear from their literature what the current demand is per point. Moore Industries offer...