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HomeSecurityAlarm SystemsFenceline Capacitance Band Pass Filters

Fenceline Capacitance Band Pass Filters

Recently SEN posted a piece on capacitive field effect sensors for perimeter solutions, which operate on the basis of tuned circuits that create resonant frequencies broken by intruders to trigger alarm events. Is it true that filters are needed to ensure such solutions function reliably?

A: Yes – we pointed out in that article that when installing capacitive field effect sensors in external environments the system must include at least 3 band pass filters. You need a lower frequency filter to reject vibrations as a result of low-mass, slow moving items like paper, leaves or plastic being blown by the wind.

You should also have a high frequency filter to stave off the vibrations of wind in field wires, while the last filter will be a lightning protection surge arrester. Making sure these 3 filters are in place during installation will save time later on when techs are running around chasing the instigators of false alarms.

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SEN News
SEN Newshttps://sen.news
Security & Electronics Networks - Leading the Security Industry with News and Latest Events. Providing information and pre-release updates on the latest tech and bringing it all to you daily. SEN News has been in print for over 20 years and has grown strong as a worldwide resource in digital media.

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