Flow-through conductivity sensor
First Claim
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1. A flow-through conductivity sensor, the sensor comprising:
- a flow conduit;
first and second electrodes disposed relative to the flow conduit to contact process fluid proximate the conduit and convey an electrical current between the first and second electrodes through the process fluid;
a current return conductor coupled to the first and second electrodes; and
at least one toroid arranged to interact with the current return conductor to measure current flowing between the first and second electrodes through the process fluid provide an indication of process fluid conductance.
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Abstract
An improved flow-through conductivity sensor is provided. The sensor includes a current return path that has a current return conductor. At least one toroid of the sensor is removed from the flow path and configured to interact with the current return conductor to provide an indication of conductivity. Additional aspects of the invention include disposing a pair of toroids about the current return conductor; disposing a toroid about the current return conductor and configuring the toroid as a transformer.
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Citations
13 Claims
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1. A flow-through conductivity sensor, the sensor comprising:
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a flow conduit; first and second electrodes disposed relative to the flow conduit to contact process fluid proximate the conduit and convey an electrical current between the first and second electrodes through the process fluid; a current return conductor coupled to the first and second electrodes; and at least one toroid arranged to interact with the current return conductor to measure current flowing between the first and second electrodes through the process fluid provide an indication of process fluid conductance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring conductivity of a process fluid in a flow conduit, the method comprising:
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contacting the process fluid with first and second electrodes coupled together by a current return path; generating an electrical current between the first and second electrodes in the process fluid with a drive toroid; and measuring current through the current return path, the measured current through the current return path being indicative of the conductivity. - View Dependent Claims (11, 12, 13)
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Specification