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E-HELP: Loop Power for the SPA in the Field

E-HELP: Loop Power for the SPA in the Field

Q: I am installing 24 SPA RTD transducers (Model: SPA/RTD/2PRG/U/-AO [DIN]) and I have a question about how the 4-20mA is powered. They are currently wired as loop-powered and I would like to confirm that this model supports loop-powered field devices.

A: The SPA/TPRG/2PRG/U/-AO [DIN] supports both source and sink mode on its current analog output. The default setting for the AO (analog output) is 4-20mA with the loop voltage sourced from the SPA. Please see Figure 4 in the SPA installation manual for changing the AO (analog output) to Current Source/Sink or a Voltage output.

Published: February 23, 2015
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