Liquid level detector

Details Liquid level detector Liquid level detector

2011-08-09

2011-08-09

Rogers, David A. (Department: 2856)

Measuring and testing

Instrument casing

C073S29000R, C073S29000R, C073S30400R, C073S30400R, C073S866500

Reexamination Certificate

active

07992437

ABSTRACT:
A liquid level detector for conductive liquids for vertical installation in a tank, the detector having a probe positioned within a sheath and insulated therefrom by a seal so that the tip of the probe extends proximate to but not below the lower end of the sheath, the lower end terminating in a rim that is provided with notches, said lower end being tapered, the taper and notches preventing debris collection and bubble formation, said lower end when contacting liquid as it rises will form an airtight cavity defined by the liquid, the interior sheath wall, and the seal, the compression of air in the cavity preventing liquid from further entry into the sheath and contact with the seal. As a result, the liquid cannot deposit a film to form an electrical bridge across the seal.

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