Conditions monitoring device

• US 4,223,302 A
• Filed: 03/05/1979
• Issued: 09/16/1980
• Est. Priority Date: 03/05/1979
• Status: Expired due to Term

• Current Assignee: Marvel Engineering Co.
• Original Assignee: Marvel Engineering Co.
• Inventors: Hocking, Guy E.
• Primary Examiner(s): Caldwell, Sr., John W.
• Assistant Examiner(s): Crossland, Donnie L.
• Application Number:
  US06/017,398
• Time in Patent Office: 561 Days
• Field of Search: 340/525, 340/524, 340/517, 340/518, 340/519, 340/520, 340/502, 340/503, 340/505, 340/523
• US Class Current: 340/525
• CPC Class Codes: G07C 5/0825 using optical means
• CPC Class Codes: G08B 19/00 Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
• CPC Class Codes: G08B 25/14 Central alarm receiver or annunciator arrangements
• CPC Class Codes: G08B 26/008 central annunciator means of the sensed conditions, e.g. displaying or registering

Abstract

A conditions monitor circuit for repetitively displaying the condition of a plurality of sensors which recognize different conditions includes a plurality of gates that are divided into groups which specify conditions for their respective sensors. The gates in each group are connected to a particular sensor and there is a clock for sequentially enabling each group of gates. The enabling clock pulse for each group of gates is also connected to a driver circuit to indicate which sensor is being interrogated. The gates in each group are connected to all of the conditions indicating driver circuits through diodes. There are display means connected to the driver circuits for indicating both the particular sensor being scanned and the condition of that sensor.

Claims

1. A conditions monitor circuit for repetitively displaying the condition of a plurality of sensors each of which detect at least three different conditions including a plurality of gates divided into groups, there being at least three gates in each group, each gate being used in sensing a different condition, with all the gates of each group being connected to a particular sensor, an identifying display means for each sensor, common condition display means including at least three display devices, one for a danger condition, one for a caution condition and one for a satisfactory condition, clock means connected to each group of gates and said identifying display means for sequentially enabling each group of gates and the corresponding identifying display means, at least three trigger circuits, each trigger circuit being connected to a display device and connected to the corresponding gate in each group of gates, and interconnections between said trigger circuits whereby at least one of said trigger circuits, when activated, disables the others.