Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-05-22
1991-11-12
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340618, 324662, 361284, G08B 2100
Patent
active
050651390
ABSTRACT:
A portable level sensing device includes an audible alarm and a visual alarm (preferably LEDs) for signalling when a predetermined level has been sensed by a capacitance proximity switch. The device is designed for use in tank cars, ships, barges, and tank trucks, and includes a graduated rod and a threaded coupling to allow one to quickly and easily set the capacitance proximity switch at the proper level in a tank. The device includes an weather-tight housing and is intrinsically safe for use in hazardous area classifications Class I, Division 1, Groups A, B, C, & D. The device can be coupled in a pressuretight manner to the tank to prevent the escape of fumes during use.
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Hofsass Jeffery A.
Ng Jin F.
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