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There is nothing wrong with using a switch block before AO channel BUT it must be a regulatory:switch block. When secondary has failed and shed to manual (?); you can use it's mode and failure condition to switch the valve to the primary if the primary is OK. You will also have to consider the...

Check the certification of the transmitter. Most recent transmitters have dual certification as IS and explosion proof. But; YES it has to be certified as IS to be in an IS loop. > If Ex'd' Certified transmitter connected to Intrinsically > Safe (I.S.) loop/Barrier of PLC/DCS will it be...

Check with your local or online electronics distributors. I found a 1200 uF Aluminum - Polymer Capacitor listed by DigiKey.com; but the voltage ratings are 2.5 - 10 V. DigiKey had 1 listing for a Cornell Dubilier Electronics (CDE) 1200 uF thin film capacitor 230 VAC for $189. each. Good luck

Hi, No you cannot use a gauge transmitter. The min zero on the gauge transmitter is 0 psig or 14.7 psia. For a vacuum application you need an absolute transmitter.