Transmitter with electrical circuitry for inhibiting discharge o

Details Transmitter with electrical circuitry for inhibiting discharge o Transmitter with electrical circuitry for inhibiting discharge o

1994-06-07

1996-12-17

Hofsass, Jeffery

Communications: electrical

Systems

Selsyn type

34031006, 34031003, 34031005, H04M 1104

Patent

active

055857779

ABSTRACT:
A transmitter coupled to a control loop which carries a loop current senses a process variable which is transmitted over the loop. Circuitry in the transmitter presents an effective capacitance C.sub.eff to the control loop. The transmitter includes an isolation network coupled between the circuitry and the control loop which prevents discharge of energy stored in capacitance C.sub.eff into the control loop.

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"Installation Practices: System Approvals, Entity Parameters, I/S Apparatus (field devices), I/S Associated Apparatus (barriers power supplies, I/O cards . . . ), Simple Apparatus, Wire, Use of Entity Parameters," Frank McGowan, Presentation made at Intrinsic Safety Seminar, Jul. 1993.
"A Design Perspective of I.S. and Fieldbus: Pmax, Imax, Ceq (Cl), Leq (l), Liftoff Voltage, Quiescent Current, Number of Devices, Handheld Terminals," Ted Schnarre, Presentation made at Intrinsic Safety Seminar, Jul. 16, 1993.
"The Significance of EMC to Manufacturers and Users of Industrial Automation Instrumentation", 8130 ATP Automatisierrungstechnische Praxis, 34(1992)Okt., No. 10, Munchen, DE.

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