Instrumentation current loop

Details Instrumentation current loop Instrumentation current loop

2006-11-28

2006-11-28

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Using a particular bridge circuit

C324S706000

Reexamination Certificate

active

07141991

ABSTRACT:
An instrumentation current loop, including a transducer having transducer output terminals. A power source is connected in series to the transducer. A bridge has a first arm and a second arm extending between a pair of input terminals, where the input terminals of the bridge are connected to the transducer output terminals. The first arm comprises a first resistance and a second resistance connected via a first junction. The second arm comprises a third resistance and a fourth resistance providing a voltage reference connected via a second junction. A meter is connected between the first junction and the second junction. Values of the first, second, third and fourth resistance are selected so that a given range of input current provided by the transducer output terminals and supplied to the input terminals of the bridge is converted to a desired range of output current for the meter.

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Definition of “Voltage Reference” from Wikipedia.org, 1 pg, Jul. 9, 2006.
Anderson, K, “The constant current loop: A new paradigm for resistance signal conditioning”, Instrument Society of America, 39th International Instrumentation Symposium, May 3-6, 1993, Albuquerque, NM.

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