Invention Grant
- Patent Title: Methods and apparatus for controlling and testing a notification appliance circuit
- Patent Title (中): 用于控制和测试通知设备电路的方法和设备
-
Application No.: US12322851Application Date: 2009-02-06
-
Publication No.: US08446285B2Publication Date: 2013-05-21
- Inventor: Karen D. Lontka
- Applicant: Karen D. Lontka
- Applicant Address: US GA Alpharetta
- Assignee: Siemens Industry, Inc.
- Current Assignee: Siemens Industry, Inc.
- Current Assignee Address: US GA Alpharetta
- Main IPC: G08B21/00
- IPC: G08B21/00
Abstract:
An arrangement for use in a safety notification system includes a source of negative voltage, a first resistor arrangement, and a circuit arrangement. The first resistor arrangement is coupled between the source of negative voltage and the signal output of the safety notification system. The circuit arrangement is configured to detect a first voltage at the signal output of the safety notification system, and to generate a trouble signal output if the first voltage at the signal output is above a first threshold or below a second threshold.
Public/Granted literature
- US20100073175A1 Methods and apparatus for controlling and testing a notification applicance circuit Public/Granted day:2010-03-25
Information query
