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Given two sensor channels, A and B. How does one diagrammatically depict 1 out of 2 logic such that you get 2 trip circuit outputs? Is this called "1 out of 2 taken twice" logic?

Dan, the SAMA logic does not involve the comm link. I need to make the change to the SAMA logic as a way of informing the DCS vendor the particulars of the logic change. My real confusion is the scaling. If 4 mA is 0 MW and 20 mA is 700 MW then how does one develop a scale factor when the...

Presently, I input a 4-20 mA signal into my DCS which represents 0 to 700 MW. I need to retransmit that signal over a communication data link as -700 MW to +700 MW. How is this accomplished? Can someone please describe the SAMA logic which would represent this signal conversion?

Can anybody provide the necessary equation(s) to calculate ammonia slip? Also, what inputs and constants are required? The application is for a combined-cycle gas fired 2x1 power plant with an SCR. The system uses 28% aqueous ammonia and NOx is sampled before and after the SCR section.

I have high velocity (315 - 357 fps) superheated steam (HP, LP, HRH) temperature that has to be measured for a power plant. How does one quantify the amount of aerodynamic heating?

I do not necessarily want to instrument anything at this time. I am preparing a spec. My client wishes all thermowells to be dimensioned in accordance with ASME PTC 19.3. The ASME standard mentions the fixed beam thermowell, which I and everyone else I asked, never heard of. Normally I would use...

According to ASME PTC 19.3, for steam velocities >300 fps, a fixed beam type thermometer well is recommended. Can anyone provide a sketch or drawing of such a thermowell or simply explain how it differs from a standard tapered well?

Are these basket tips usually supplied by the condenser manufacturer or the transmitter manufacturer? Procurement source?

What are "basket tips" as they relate to measurement of main condenser absolute pressure?