could also be aux power related...and mess of other things.
"Matt Ion" wrote in message news:b4f9h.355932$R63.301753@pd7urf1no... | Jim wrote: | > joble email@example.com wrote: | >
| >>Hi, | >>
| >>we have an alarm for 2,5 years now. It is a Rokonet system. The PIR | >>detector's used are Pyronix Magnum Ultra. | >>
| >>It worked fine for more than 2 years, but last summer we had false | >>alarms almost once per week. Always on the same sensor. Sensor was | >>replaced by the installer, but next night there was again a false | >>alarm. | >>
| >>The Pir is now replaced by a dual detector, and this detector seems to | >>work well. | >>
| >>The next week we had false alarms with both the two other PIR's. So | >>they are also replaces by dual's. | >>
| >>Now it has worked fine for 3 months. But the installer sends us a bill | >>for the replacement of the first detector. And i think another bill for | >>the two others will follow. Together this is the 25% of the price of | >>the system! I do not think this is normal after 2,5 years. (The | >>warranty of the system is 1 year, but on the pyronix site i read the | >>pir detectors come with 5 years of warranty) | >>
| >>I want to argue with the installer but first i want to learn more about | >>the problem. So i have some questions: | >>
| >>Is it possible that a fly triggers the pir? | >>Can this problem be due to bad adjustment of the pir or the use of the | >>wrong lenses? | >>Can the reason be in the rokonet system instead of in the PIR's? | >>Any other ideas??? | >>
| >>Thanks in advance... | >
| > A couple of things that haven't been mentioned yet. | >
| > Strong radio frequency signals can sometime cause sensors to trip. Do | > you have any RF souces in your home or do some neighbors? Taxi cabs, | > police cars etc can sometimes cause problems. | | This was along the lines of my first thought: if the original sensor was swapped | out, even with an identical one, and the problem repeated within the same day, | then the problem is clearly not with the sensor itself - there's either a wiring | fault, or the "brain" of the alarm is failing. | | I didn't think of RFI, but that would certainly explain the problem occuring in | other sensors/zones. One test I would have performed as well would have been to | leave the first offending line with NO sensor on it for a couple days to see if | that line triggers again (which of course, would determine or rule a wiring or | brain fault). | | > See if you can figure out when ( time of the year) (time of the day) | > false alarms occured. If you've changed window coverings, sometimes the | > angle of the sun at certain times of the year can shine directly into | > motion detectors ..... reflect off of objects in a room ..... heat up | > glass which can rapidly cool ....... or if you've changed houshold | > heating system or moved objects that now allow hot air to flow past the | > PIR's. | | Seconded as well. Unfortunately the OP doesn't mention the relative positions | of the three sensors to each other - are they in different rooms, on different | floors, etc.? Is this a home, an office area, a warehouse? More details like | this would help the "remote troubleshooting". | | > Obviously, dual technology sensors will help reduce these things from | > affecting sensors. | | There is that as well. | | Bottom line, from what we're told here, it sounds like the "installer" that put | in the new sensors really didn't do very thorough troubleshooting - the failure | on the other sensors after replacing the first should have been an indication | right away that something else was wrong. Who knows, maybe the chance to sell | the OP his new "fancy" sensors was incentive not to dig too deeply into the real | cause of the problem. | | I hate to agree with Bass here, but I wouldn't pay the installer either - he | hasn't solved the problem, he's just sold the OP snake oil.