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Paul T
Well, it's not that bad. The cases I remember were pressure transmitters. The process connection was on the base of the transducer, and the "upper" part was the transmitter. I am thinking Bailey, for example- if you wanted the unit for a classified area, the housing that attached to the base was NEMA 7. If not, it was NEMA 1, or maybe nothing at all. Or another example is a TC or RTD, maybe in a thermowell. Again, for classified areas the top of the thermowell looked like something that belonged on a tank, for non-classified you might just have the top of the TC sticking out of a compression fitting (used to do a lot of TCs sticking out of compression fittings in my last job). You could then conduit (IMC or RMC... what fun!) the the top of the thermowell or the TC wire housing to your temperature transmitter, if you were using one, which again was in a cylindrical NEMA 7
housing with a top that screwed on and off. The jobs I used to deal with were Class 1 Div 2, and this was back in the early '90s, so things may
certainly be different now.
Does anyone on the list work in a process plant with classified areas? What is your plant practice for PT's, TT's, FT's, pH or ORP instruments, or anything else that may be in a classified area?
Paul T
housing with a top that screwed on and off. The jobs I used to deal with were Class 1 Div 2, and this was back in the early '90s, so things may
certainly be different now.
Does anyone on the list work in a process plant with classified areas? What is your plant practice for PT's, TT's, FT's, pH or ORP instruments, or anything else that may be in a classified area?
Paul T