Why does the Pyronix XDL12TT-WE keep alarming when in direct sunlight?

Question

Why does the Pyronix XDL12TT-WE keep alarming when in direct sunlight?

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Asked 4 weeks in Intruder Alarms by Neil Rodgers | 1 Answer

The Pyronix XDL12TT-WE has 2 PIR sensors as well as a microwave sensor. I thought that this would filter out sunlight issues but goes off constantly throughout the morning on a sunny day. Its looks obvious that this is being triggered purely based on the PIR's as the sun should not interfere with the microwave detection. I am not able to point the sensor in any other direction. Is there any way to prevent false alerts when there are definitely no intruders, just the sun?

1 Answer

score 0 · Answer 1

The Pyronix XDL12TT-WE is a dual-technology outdoor detector that can experience false alarms when exposed to direct sunlight due to a combination of factors, including:

Overheating of the PIR sensor: Direct sunlight can cause the passive infrared (PIR) sensor to heat up, potentially reducing its ability to distinguish between normal environmental changes and genuine motion.
Reflected Infrared (IR) radiation: Sunlight reflecting off surfaces can create IR "noise," confusing the detector's PIR sensors and triggering false alarms.
Microwave sensor interference: The microwave sensor in the dual-technology detector may also become more sensitive in higher temperatures or detect unexpected movement caused by heat waves in the air.
Poor installation angle or placement: If the detector is not installed at the recommended height and angle, sunlight may directly hit the lens, increasing the likelihood of false alarms.

Solutions to Reduce False Alarms

Here are steps to mitigate the issue:

Proper Placement:
- Install the detector in a shaded area where direct sunlight does not hit the lens or housing.
- Avoid south-facing placements in direct sunlight during peak hours.
Adjust Sensitivity Settings:
- Reduce the sensitivity of the PIR sensor if sunlight exposure is unavoidable.
- Use the settings to balance the sensitivity of the PIR and microwave technologies.
Ensure Correct Mounting Height and Angle:
- Follow the manufacturer’s installation guide, typically suggesting a height of 2.4m for the XDL12TT-WE.
- Slightly angle the detector downward to prevent sunlight from directly entering the lens.
Use Sunshields or External Covers:
- Install additional protection like a sunshield to block direct sunlight.

If these steps don’t resolve the issue, it might indicate a faulty unit or an environmental factor requiring further adjustment. Consult Pyronix Technical Support or your supplier for more guidance. You can also refer to the installation manual for detailed recommendations.