WAREWASH MACHINE CHEMICAL SENSOR AND RELATED SYSTEM AND METHOD
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Accused Products
Abstract
A flow through chemical sensor includes a housing having a through passage along which chemical can flow, a sidewall of the housing having first and second openings that communicate with the through passage. A first electrode is mounted on the housing and aligned with the first opening, the first electrode of a plate configuration with a unitary depression that extends through the first opening and to a peripheral edge of the through passage. A second electrode is mounted on the housing and aligned with the second opening, the second electrode of a plate configuration with a unitary depression that extends through the second opening and to the peripheral edge of the through passage. A method of detecting presence or absence of chemical is also provided.
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Citations
24 Claims
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1-12. -12. (canceled)
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13. A method of detecting presence or absence of a chemical in a chemical feed line of a warewash machine, the method comprising the steps of:
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providing a flow through sensor in the chemical feed line, the sensor including a through passage and a pair of electrodes in communication with the through passage, the sensor connected in a chemical detection circuit via the pair of electrodes; applying a periodic excitation signal to the chemical detection circuit; the sensor attenuating the periodic excitation signal according to impedance level of the chemical such that a level of attenuation varies inversely with impedance of the chemical and the sensor causing little or no attenuation in the absence of the chemical; evaluating the attenuated signal to determine the presence or absence of chemical. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of monitoring a chemical feed line of a warewash machine, the method comprising the steps of:
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utilizing a flow through sensor in the chemical feed line, the sensor including a through passage and a pair of electrodes in fluid communication with the through passage, the sensor connected in a chemical detection circuit via the pair of electrodes; applying a periodic excitation signal to the chemical detection circuit, wherein the periodic excitation signal is attenuated as a result of impedance level, wherein a level of attenuation varies inversely with impedance level such that lower attenuation occurs in the absence of chemical in the through passage; and evaluating attenuation of the excitation signal to reach a determination as to presence or absence of chemical in the through passage. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification