NORMALLY CLOSED: When the door or window is open, the contact will give an open signal and when the door is closed the contact will give a closed (circuit) signal.This Contact Works with Any Access Control or Burglar Alarm System Available.Will make Sense Door Closer at Roughly ¾” or 15mm.
10 White ABS Surface Mount Normally Closed Door Contact Switch with 11" Pigtail. papyrus white/dark red leather 1971 280sel Black/black leather 1973 300sel 4.5, silver blue metallic/blue leather 1979 450sel 516 red/bamboo Print. When the door or window shuts, the door sensor will notify your security system that the opening has been closed. last week there was talk on the forum here about single or double (switch) holes in the door frames. When this happens the access control system or alarm system will sense the change in continuity and will know that the door or window has been opened. Hence when the door opens beyond the ¾” point the door position switch will switch from a closed signal to an open signal. The door position switches operate with a built an internal magnetic reed switch that closes when the opposing magnet comes within ¾” of the door sensor. These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system. 26 Bit 125 KHz Proximity Adjustable Wristbandsġ0 pcs Wired White Door Contacts Surface Mount NC Security Alarm Door Window Sensors.These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems Home / Alarm System Contact Sensors / 10 pcs Wired White Door Contacts Surface Mount NC Security Alarm Door Window Sensors.These ¾” Door Contact Position switches (DCS) Work with All Access Control and Burglar Alarm Systems. 
26 Bit Proximity Inkjet Printable CR80 Cards.26 Bit Proximity Printable CR80 Cards with Magnetic Strip.
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