PIRs

Submitted on June 9, 2020 | John Adams
We’ve heard there are 2 different types of Fresnel lens, one being better than the other in alarm sensor applications. Has SEN heard anything about this? A: There are 2 types of ‘fresnel’ lens – one type has a design...
Submitted on May 19, 2020 | John Adams
They're the most common sensing device used in alarm systems but some installers still get it wrong when they're putting in PIRs and after a couple of bad experience, opt to use more expensive dual technology sensors instead of installing...
Submitted on April 24, 2020 | John Adams
Are all PIRs the same or do the better and more expensive ones really offer superior performance? What sorts of features offer end users and installers the best results? A: Quality sensors are superior, especially in challenging installations. If you’re...
Submitted on March 13, 2020 | John Adams
We look after a site that has an older PIR sensor in a warehouse – the sensor has a 40m range, but the warehouse is longer than this – around 70m. The zone works ok most the time, but we’ve...
Submitted on September 27, 2019 | John Adams
Q: Is it worth using somewhat less sensitive dual detection technology to increase resistance to false alarms? A: It doesn’t necessarily follow that a dual technology sensor is less sensitive to a genuine intrusion than a PIR – the reduction...
Submitted on September 3, 2018 | John Adams
We have only 2 zones in a very small alarm system for PIRs and are wondering where you think would be the best location would be in a single-story domestic application. A: Design of the home is going to dictate...
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