how alarm sensors work?

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megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: February 08, 2007 at 3:30 AM / IP Logged

Hai..

Can i know the concepts and the theory...how alarm sensirs works? Example...Glass Break Sensors...From what I know..it have 3 wires...

1st wire - To +ve supply

2nd wire - To -ve supply

3rd wire -ve output from the sensors

Ist correct? Meanning to said...the alarm will trigger when receive -ve current rite? What the voltage of the current?

brhaugen

Copper - Posts: 275

Joined: September 30, 2005

Location: North Dakota, United States

Posted: February 08, 2007 at 6:45 AM / IP Logged

Your are correct, the signal sent on the 3rd (trigger) wire is very small in the neighborhood of 300ma depending on the mfg.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: February 08, 2007 at 7:52 AM / IP Logged

Most present day alarm sensors are considered 'power' sensors. Powered sensors have built in processing of the actual sensor, so they require a constant source of power. The onboard processor then controls the seperate (-) outputs to trigger the alarm brain.

Kevin Pierson

megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: February 08, 2007 at 6:31 PM / IP Logged

Means, the 3rd wire..I can hook to the door trigger rite? Alarm will trigger if the sensor detect something?

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how alarm sensors work?

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