Measuring equipment for isolating a plurality of probes contacting a sample
First Claim
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1. Measuring equipment for measuring a plurality of properties of a sample with separate probes contacting the sample simultaneously, comprising:
- a plurality of probes;
a reference source line connected to each probe;
a signal line connected to each probe for providing a measurement signal; and
a first switch assembly connected to a first reference source line and a first signal line to isolate one of said plurality of probes from generating any interference while measuring the sample.
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Abstract
Measuring equipment, such as a portable pH meter system, can include a plurality of probes for measuring different properties of a sample with each of the probes contacting the sample simultaneously. A reference source line connected to an appropriate reference source can be connected to each probe, while a signal line connected to each probe can provide a measurement signal. A switch assembly is provided for each of the probes in order to isolate the respective probes from each other to prevent any interference when measuring the sample.
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Citations
16 Claims
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1. Measuring equipment for measuring a plurality of properties of a sample with separate probes contacting the sample simultaneously, comprising:
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a plurality of probes; a reference source line connected to each probe; a signal line connected to each probe for providing a measurement signal; and a first switch assembly connected to a first reference source line and a first signal line to isolate one of said plurality of probes from generating any interference while measuring the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Measuring equipment for measuring pH and dissolved oxygen, comprising:
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a pH probe for providing a pH measurement signal; a dissolved oxygen probe for providing a measurement dissolved oxygen signal, the pH probe and dissolved oxygen probe have a configuration for simultaneously contacting a sample; a first reference source; a first reference source line connecting the pH probe to the first reference source; a second reference source; a second reference source line connecting the dissolved oxygen probe to the second reference source; means for processing the pH signal and dissolved oxygen signal to provide respectively a measurement of pH and dissolved oxygen; a first switch assembly connected to the first reference source line; a second switch assembly connected to the second reference source line; and means for controlling the first and second switch assemblies to isolate the pH probe and the dissolved oxygen probe during their consecutive measurements to prevent interference in providing their measurement signals.
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13. Apparatus for measuring dissolved oxygen and pH in a sample, comprising:
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a dissolved oxygen probe (1) and a pH probe (8) for immersion in the same sample; means for isolating the dissolved oxygen probe from a reference potential (7) during measurement with the pH probe, characterized by means (12) for isolating the pH probe from the reference potential during measurement with the dissolved oxygen probe; and means (4,
6) for short-circuiting electrodes of the dissolved oxygen probe during measurement with the pH probe. - View Dependent Claims (14)
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15. An apparatus for measuring conductivity and pH of a sample, comprising a conductivity probe (21) and a pH probe (8) for immersion in the same sample characterized by:
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means (22) for connecting the conductivity probe to a conductivity-voltage converter (24); means (23) for connecting the conductivity probe to a reference potential (7), and switching means (25,26,27,28) for isolating the conductivity probe from the reference potential during measurement with the pH probe, whereby the switching means is constituted by a non-inverting type operational amplifier (27) and first and second switches (26,28), the reference potential is connected to a non-inverting input of the operational amplifier (27b), the connecting means (23) is connected to the output of the operational amplifier via the first switch (26) and to an inverting input (27b) of the operational amplifier via the second switch (28), and the two switches (26,28) open and close simultaneously.
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16. An apparatus for measuring a conductivity of and a dissolved oxygen in a sample, comprising a conductivity probe (21) and a dissolved oxygen probe (1) for immersion in the same sample characterized by:
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means (23) for connecting the conductivity probe to a conductivity-voltage converter (24); means (23) for connecting the conductivity probe to a reference potential (7); a first switching means (25,26,27,28) for isolating the conductivity probe from the reference potential during measurement with the dissolved oxygen probe, whereby the first switching means is constituted by a non-inverting type operational amplifier (27) and first and second switches (26,28), and the reference potential is connected to a non-inverting input of the operational amplifier (27b), the connecting means (23) is connected to the output of the operational amplifier via the first switch (26) and to an inverting input (27b) of the operational amplifier via the second switch (28), and the two switches (26,28) open and close simultaneously, and a second switching means (4,6) for isolating the dissolved oxygen probe and short-circuiting its electrodes during measurement with the conductivity probe.
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Specification