Bob Dolph Answers Questions on False Alarms, Spare Pairs to Transmit Video
Q: How can I reduce passive infrared (PIR) false alarms from being caused by spiders and other small insects crawling across the sensors?
A: An old technique is to set up another PIR looking at the same detection zone and wire the contacts in parallel so that they must both trip at the same time to break the alarm loop.
Q: Can I use spare pairs in an existing telephone system to transmit video using a UTP (unshielded twisted pair) device?
A: Yes, many times this can be a nice little way to save on cabling or in a retrofit situation. Make sure to use “dry copper” pairs. There should be no dial-one or 48 volts on the pairs. Check out companies like NVT (www.nvt.com) for UTP equipment.
If you enjoyed this article and want to receive more valuable industry content like this, click here to sign up for our FREE digital newsletters!
Security Is Our Business, Too
For professionals who recommend, buy and install all types of electronic security equipment, a free subscription to Security Sales & Integration is like having a consultant on call. You’ll find an ideal balance of technology and business coverage, with installation tips and techniques for products and updates on how to add sales to your bottom line.
A free subscription to the #1 resource for the residential and commercial security industry will prove to be invaluable. Subscribe today!