GB1252579A - - Google Patents

Info

Publication number
GB1252579A
GB1252579A GB1252579DA GB1252579A GB 1252579 A GB1252579 A GB 1252579A GB 1252579D A GB1252579D A GB 1252579DA GB 1252579 A GB1252579 A GB 1252579A
Authority
GB
United Kingdom
Prior art keywords
circuit
transistors
responsive
lamp
switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
English (en)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1252579A publication Critical patent/GB1252579A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric
    • G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Electronic Switches (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Emergency Alarm Devices (AREA)
GB1252579D 1967-11-21 1968-11-12 Expired GB1252579A (https=)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68475967A 1967-11-21 1967-11-21

Publications (1)

Publication Number Publication Date
GB1252579A true GB1252579A (https=) 1971-11-10

Family

ID=24749437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1252579D Expired GB1252579A (https=) 1967-11-21 1968-11-12

Country Status (3)

Country Link
DE (1) DE1809704A1 (https=)
FR (1) FR1592768A (https=)
GB (1) GB1252579A (https=)

Also Published As

Publication number Publication date
FR1592768A (https=) 1970-05-19
DE1809704A1 (de) 1969-06-26

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees