Admittance measuring system for monitoring the condition of materials
First Claim
1. In a two-wire transmitter system comprising a power supply and a load at one location and a two-wire transmitter at another location interconnected by a pair of transmission lines carrying a variable signaling current, the improvement comprising:
- an admittance sensing probe including a probe electrode adapted to sense the condition and corresponding admittance of materials;
an admittance responsive network coupled to said probe representing the condition of materials; and
output means coupled to said admittance responsive network for varying the signaling current in response to the condition of materials.
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Reexamination
Accused Products
Abstract
A two-wire transmitter includes an admittance sensing probe adapted to sense the conditions and corresponding admittance of materials. The probe is coupled into an admittance responsive network which generates an admittance signal representing the condition of materials. The output current from the transmitter is varied in response to the admittance signal. In one embodiment of the invention, the admittance responsive network comprises a variable frequency oscillator whose frequency varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a ramp generator with a frequency which varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a bridge whose balance changes in response to the admittance of the materials.
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Citations
35 Claims
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1. In a two-wire transmitter system comprising a power supply and a load at one location and a two-wire transmitter at another location interconnected by a pair of transmission lines carrying a variable signaling current, the improvement comprising:
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an admittance sensing probe including a probe electrode adapted to sense the condition and corresponding admittance of materials; an admittance responsive network coupled to said probe representing the condition of materials; and output means coupled to said admittance responsive network for varying the signaling current in response to the condition of materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification