Instrument I/O Type

What do you THINK the answer is?

Can't you figure this out? Come on!!!!!

I/O List - Instrument and Control Engineering for Process Industries

This sounds like homework.

If you could push any numbers into an RTD, it would be a DO.

>AO-Analog Output - Control Valves

Valves are chunks of machined metal with elastomer seals. How do you get a chunk of metal to respond to a AO?

I think someone is in the Pharma sector as my company is. it is quite common for us in this sector to refer to valves ( ball / gate ) with 4-20ma I/P positioners on them as simply a "Control Valve." Should I mention a control valve to anyone in engineering here, they will assume I mean a positionable valve with 4-20ma control. It is not uncommon to get a sketch type RFQ, from companies that don't use a big engineering firm, to have a positionable valve labeled as simply a control valve, even though they have 5 other automated valves in their P&ID sketch. (Big engineering firms tend to be more technically correct in their use of terminology.) Yes this is an incorrect label, as any valve can be considered a control valve - even manually operated ones, but it is done. His sheet looks quite a bit like one of mine. However my analog in is not limited to transmitters, and quite nicely holds the RTD's as they are definitely analog.

What does the "approved for construction" P&ID say about each one? Each one might be a temperature switch instrument, or it might be a temperature transmitter instrument. Only, it's a bit difficult to read the drawing from here.