Boots – shoes – and leggings
Patent
1982-09-22
1983-12-13
Wise, Edward J.
Boots, shoes, and leggings
364481, 340618, G01F 2300
Patent
active
044208103
ABSTRACT:
Apparatus for operating a motor driven device and testing the state of a limit switch in series with the motor, in the environment of a field interface device in a tank farm is disclosed. During operation of a relatively high power relay (115), a latched (145) signal ties one side (130) of the two-wire circuit to ground through a low impedance (139). When testing of the state of a series limit switch (119) is needed, the same supply voltage is switched onto one side of the two-wire circuit (147) but the low side of the two-wire circuit is grounded through a relatively high impedance (135, 136) to prevent sufficient current for operating the relay coil (117) from flowing. The presence or absence of current through the high impedance is detected through a coupling device (137) which provides a logical one or zero on an output line (68) to determine whether the limit switch is open or closed.
REFERENCES:
patent: 4244385 (1981-01-01), Hotine
patent: 4258422 (1981-03-01), Dougherty et al.
patent: 4275382 (1981-06-01), Jannotta
patent: 4296472 (1981-10-01), Sarkis
patent: 4349882 (1982-09-01), Asmundsson et al.
patent: 4352159 (1982-09-01), Colby
patent: 4382382 (1983-05-01), Wang
Chow Edmund E.
Glass Frank S.
Hernandez Rafael
Moncrief, Jr. Marion L.
Process Technologies, Inc.
Wise Edward J.
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