Contact monitor-annunciator

Details Contact monitor-annunciator Contact monitor-annunciator

1983-11-21

1985-12-10

Rowland, James L.

Communications: electrical

Condition responsive indicating system

With particular system function

62127, 62129, 123 4115, 340648, 340652, 340663, G08B 2300

Patent

active

045583064

ABSTRACT:
A contact monitor and annunciator unit for providing a persistent warning in the event one of a selected number of event monitoring circuits associated with a mobile refrigeration system opens. The unit includes a number of warning circuits that are electrically isolated from the monitoring circuits by optical isolators and a separate power supply so that the initial cause of a shut down due to abnormal operating conditions can not only be annunicated but also differenciated from a shut down caused by a momentary power failure.

REFERENCES:
patent: 3611364 (1971-10-01), Jones
patent: 3696364 (1972-10-01), Lavelle
patent: 3854089 (1974-12-01), Emler
patent: 4228427 (1980-10-01), Niedermeyer
patent: 4247849 (1981-01-01), Morris et al.
patent: 4498077 (1985-02-01), Richardson

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