Programmable fluid detector

Details Programmable fluid detector Programmable fluid detector

1986-12-22

1988-04-05

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340603, 340604, 340605, 340620, 73 405R, 73 611R, 324 61P, G08B 1900, G01B 2100

Patent

active

047361930

ABSTRACT:
A plurality of probes for sensing their fluid environment are electrically connected to a controller. The controller includes an alarm transducer, relays, a keyboard, and a display connected to a microprocessor and associated memories. Under keyboard control and software direction the microprocessor is operable in a monitor mode in which it monitors the probes and activates the transducer, relays, and display in response to probe signals corresponding to selected alarm conditions, and in a program mode in which the alarm conditions, relay latching conditions, and probe to relay assignments may be selected via the keyboard. A hardware timer interrupts the microprocessor periodically to clock a software timer which provides six second and six minute timers. When monitor mode is exited, the six second timer is reset and if a security code is not entered in six seconds the timer elapses and the system returns to monitor mode. Similarly, when program mode is entered, the six minute timer is reset and if no program entries are made in six minutes, the system returns to monitor mode. The six minute timer is reset each time a program entry is made and is delayed so long as probe to relay assignments are being made.

REFERENCES:
patent: 3882465 (1975-05-01), Cook et al.
patent: 4644354 (1987-02-01), Kidd
patent: 4646069 (1987-02-01), Andrerasich et al.

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