Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-01-23
1989-09-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340502, 340594, 340693, G08B 1700, G08B 2300
Patent
active
048642835
ABSTRACT:
A temperature alarm includes a thermostat for actuating an audible alarm, a control panel-mounted LED and a circuit board-mounted LED. The audible alarm, once actuated by the thermostat, can be temporarily disabled by the user by actuating a disable timer connected to the audible alarm. After a period of time the timer times out to return control of the audible alarm to the thermostat. The panel LED is illuminated continuously while the chosen temperature value is exceeded. The circuit board LED is mounted to a circuit board within the equipment housing. Once illuminated by the thermostat, the circuit board LED remains actuated regardless of the temperature to provide an indication to a service technician that the chosen temperature was exceeded since the last servicing. The circuit board-LED, coupled to a latching relay also mounted to the circuit board, is extinguished by manually resetting the latching relay.
REFERENCES:
patent: 3893092 (1975-07-01), Kessler
patent: 3959787 (1976-05-01), Messmann et al.
patent: 4262288 (1981-04-01), Lanphier, III et al.
patent: 4322594 (1982-03-01), Brisson
patent: 4549141 (1985-10-01), Teass, Jr.
patent: 4596203 (1986-06-01), Lorek
patent: 4661804 (1987-04-01), Abel
Mullen Jr. Thomas J.
Swann III Glen R.
Tandem Computers Incorporated
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