The AT200 Transmitter Features One Moving Part, a Float, that Provides Continuous Level Reading Via Common Industry Protocols Such as 4-20 mA, HART, Honeywell DE, Foundation Fieldbus, while Deriving its Source of Power from the Control Loop. The Transmitter Detects the Position of the Float within the Float Chamber by Using "Time of Flight" Technology to Calculate Distance. The Resulting, Non-Contact, Level Measurement is Highly Accurate.