The DHI-ARD2231-W2 is a wireless indoor motion detector that combines passive infrared (PIR) and microwave technology for more accurate human motion detection while minimizing false alarms. With pet immunity, temperature compensation, and long battery life, it's designed for dependable performance in homes or small businesses.
Key Features
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Dual Detection Technology - Combines PIR and microwave sensors to significantly reduce false alarms from temperature shifts or environmental changes.
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Pet Immunity Function - Ignores pets up to 18 kg and under 50 cm in height — perfect for households with small animals.
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3-Level Sensitivity Adjustment - Customize detection performance based on the room environment and risk level.
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Real-Time Temperature Monitoring - Displays current room temperature and alerts users of potential overheating.
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Stable Wireless Communication - Frequency hopping and two-way AES128 encrypted communication ensure reliability and security.
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Cloud Firmware Updates - Supports OTA (Over-the-Air) updates and auto-rollback if the update fails.
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Jamming Detection & Tamper Alerts - Enhances security by alerting to potential signal jamming or tampering attempts.
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Long Battery Life - Powered by a single CR123A battery with up to 3 years of typical use (10 triggers/day).
Perfect For:
- Residential living rooms and bedrooms
- Small offices or meeting rooms
- Pet-occupied homes
- Apartment entrances or stairwells
- Enclosed storage areas
- Light commercial indoor spaces
Install Tips
- Mount the device at 2.2 meters for optimal 12m / 90° detection coverage.
- Use bracket ARA33 for ceiling installations if required.
- Enable test mode during installation for alignment checks.
- For pet immunity to work properly, avoid pointing the detector towards furniture that pets can climb.
- Use app configuration to fine-tune sensitivity and check real-time temperature.
- Position away from air vents or heating appliances to minimize false triggers.
Downloads
Quick-Read Specs Card
| Specification |
Details |
| Detection Range |
12m (90° at 2.2m height) |
| Detection Mode |
PIR + Microwave |
| Pet Immunity |
≤ 18 kg, height < 50 cm |
| Sensitivity |
3 levels adjustable |
| Temp Monitoring |
Yes, with overheating alarm |
| Wireless Distance |
Up to 1,200m (open space) |
| Encryption |
AES128 + Frequency Hopping |
| Power |
1 × CR123A Battery (up to 3 years) |
| Tamper/Jamming Alerts |
Yes |
| Operating Temp |
–10°C to +55°C |
| Mount Type |
Wall / Ceiling (ARA33 Bracket) |
Extra Info
Pet Immunity Designed for Real Homes
The Dahua ARD2231-W2 is engineered with practical, real-world environments in mind—especially those with furry family members. Using advanced motion pattern analysis, the sensor can intelligently distinguish between human movement and that of pets weighing up to 18 kg (approximately 40 lbs). This ensures that your alarm system remains quiet when your cat jumps onto furniture or your small dog walks through a hallway. It's a perfect fit for pet-friendly homes, reducing false alarms and providing peace of mind without compromising detection accuracy.
Smart Dual Detection Technology
To enhance precision, the ARD2231-W2 features dual detection technology, combining Passive Infrared (PIR) with microwave sensing. PIR detects changes in infrared energy (body heat), while the microwave sensor confirms motion based on movement through electromagnetic fields. This dual-layer approach helps eliminate common false triggers caused by moving curtains, sunlight reflections, or heat emitted from appliances and HVAC systems. As a result, the device only triggers on actual intrusions, ensuring reliable security performance across various environments and lighting conditions.
Temperature Monitoring Built-In
Beyond standard motion detection, the sensor also functions as a real-time temperature monitor, displaying the current ambient temperature and issuing alerts if it exceeds preset safety thresholds. This feature adds an extra layer of protection for spaces that require stable climate control, such as baby rooms, server rooms, medical storage, or electronics areas. With proactive temperature alerts, users can address heating or ventilation issues before they escalate into safety or equipment problems.
Reliable Wireless Communication
Operating in the 433 MHz RF band, the ARD2231-W2 is built for dependable wireless communication even in signal-dense environments. It uses AES128 encryption to secure data transmissions and frequency hopping to avoid interference from nearby devices like Wi-Fi routers or cordless phones. Whether installed in homes, offices, or industrial spaces, this ensures a stable and secure connection to your alarm hub, with minimal risk of jamming or dropped signals.
Cloud-Enabled Maintenance
Keeping the system up-to-date is effortless with cloud-based firmware updates. These updates can be pushed remotely without the need to remove the device or manually connect to it—making it easier for installers or system owners to deploy enhancements, security patches, or new features. Additionally, the device includes an auto-recovery mechanism, which automatically reverts to the last stable version if an update fails, ensuring uninterrupted operation and reducing service calls.
Q&A
Q: Can this detect people accurately without false alarms?
Yes. It uses both PIR and microwave detection to double-check motion, reducing false alarms from heat, light, or drafts.
Q: Will it ignore my pets?
Yes, pets under 18kg and shorter than 50cm will not trigger the detector if properly installed.
Q: How far can it detect motion?
Up to 12 meters with a 90° field of view at 2.2m install height.
Q: Does it require wired power?
No, it runs on a single CR123A battery with up to 3 years of life (under typical conditions).
Q: How secure is the wireless connection?
It uses AES128 encryption and frequency hopping to prevent jamming and eavesdropping.
Q: Can I see the room temperature in the app?
Yes, the current temperature is shown in the app, and it supports overheat alerts.
Q: Can I update it remotely?
Yes, it supports cloud updates and will auto-restore if an update fails.
Q: What happens if someone tries to tamper with it?
Tamper detection will trigger an alert if the device is opened or removed.
