| 摘要 |
A protection circuit for use with a hot water dispensing apparatus of the type which includes a reservoir and a heating element coupled to the reservoir for heating water retained therein. The protection circuit includes a conductivity detector coupled to the reservoir for detecting a desired quantity of water in the reservoir. A first sensor and a second sensor of the conductivity detector are coupled to the reservoir at spaced apart locations. A conductivity detector circuit is coupled to the first and second sensors and coupled to a control circuit of the hot water dispensing apparatus for preventing operation of the apparatus until a desired quantity of water is disposed in the reservoir.
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