Which statement describes common power options for field instruments and the role of isolation?

Which statement describes common power options for field instruments and the role of isolation?

• A. 12 V DC is the standard only option with no isolation.
• B. 24 V DC or 24 V AC; loop-powered transmitters; isolation transformers or isolated power supplies to reduce noise and improve safety.
• C. 48 V DC with no isolation is typical.
• D. Solar power with no regulation is common.

Answer: (B)