I know some PLC already contain routines that calculate gas flows according to AGA 3, 8, etc... Everything I am reading on certification deals with the device that is measuring but the software to do the measurement must follow the AGA standard calculations. So the question I have is if I use a meter to get static, diff, and temp, and that meter is certified for use for gas measurement, could I develope a program for a PLC/PAC as long as it followed the AGA guidelines to caculate the gas flow? Does that program have to be certified?
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