Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1987-01-16
1988-11-22
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Thermal type
374 43, 374 45, G01F 2322, G01N 2500
Patent
active
047856653
ABSTRACT:
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.
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