초록 ▼

A measuring instrument includes a U-shaped probe that senses temperature and is useful for sensing the level of a liquid in a tank. A main probe unit has first and second legs disposed in a side-by-side, parallel relationship and a heater cable is contained within and along the length of the first l

A measuring instrument includes a U-shaped probe that senses temperature and is useful for sensing the level of a liquid in a tank. A main probe unit has first and second legs disposed in a side-by-side, parallel relationship and a heater cable is contained within and along the length of the first leg. Heated sensors are disposed inside the first leg in positions proximate to the heater cable for sensing temperatures at a plurality of positions along the first leg, and non-heated sensors are disposed in the second leg for sensing temperatures at a plurality of positions along the second leg. An electrical circuit is connected to the heated temperature sensors and the non-heated temperature sensors for producing at least one signal indicating the temperatures of the heated sensors and preferably indicating the temperatures of the heated sensors relative to the non-heated sensors.

대표청구항 ▼

A measuring instrument that senses heat transfer along a probe that is inserted at least partially into an environment, the heat transfer occurring between the probe and the environment, comprising: a main probe unit having first and second legs disposed in a side-by-side spaced apart substantially

A measuring instrument that senses heat transfer along a probe that is inserted at least partially into an environment, the heat transfer occurring between the probe and the environment, comprising: a main probe unit having first and second legs disposed in a side-by-side spaced apart substantially parallel relationship; a heater circuit having a heater segment for heating at least said first leg of said main probe unit and being disposed in an orientation extending along said first leg; heated sensor means disposed in sid first leg in positions proximate to said heater segment for being heated by said heater segment and for sensing temperatures at a plurality of positions along said first leg; second sensor means disposed in said second leg in a position for sensing temeratures at a plurality of positions along said second leg; and circuit means connected to said heated sensor means and said second sensor means for producing an output signal proportional to the temperatures sensed by said heated sensor means and said second sensor means whereby the output signal is proportional to the heat transfer measured along the probe and is an indication of environmental conditions.