I support a small test facility and we have purchased some Masoneilan control valves to replace some really old control valves. We decided to upgrade from pneumatic valve positioners to digital valve positioners. While looking through the manual another engineer found that the Masoneilan SVI II AP positioners we purchased use HART digital protocol and operate on ~9 VDC with a 4-20mA signal. The question is our control power is 24VDC so what would we need to do to make this work?
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