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PPMv Converter for Dewpoint on DeltaV

Hi. Please I have a 4-20mA sinal input to a DeltaV to readout 0-500ppmv on the faceplate. What available standards or formula is available for me to adopt in writing a function that can convert the ppmv to dew point degree centigrade?

My field device is an aurora moisture analyzer for measurement of hydrocarbon gas quality. I appreciate all responses.