Product SKU: DHI-ARD2231-W2
Product Overview
The Dahua DHI-ARD2231-W2 is a wireless dual-technology indoor motion detector combining a dual-element passive infrared sensor with 24 GHz microwave detection. Both technologies work together to help verify movement and reduce false alarms caused by temperature changes or environmental interference. The detector provides coverage up to 12 metres across a 90° angle when installed at the recommended height of approximately 2.2 metres. Three sensitivity levels allow the response to be adjusted for the room, while automatic temperature compensation helps maintain detection performance in warmer conditions. Pet immunity supports animals weighing up to approximately 18 kg and below 50 cm in height when the unit is installed correctly. The detector also supports temperature monitoring, tamper protection, low-battery reporting, two-way wireless communication, frequency hopping, AES-128 encryption and cloud firmware updates through a compatible Dahua wireless alarm system.
Key Capabilities
Dual-Technology Detection
A dual-element PIR sensor works with 24 GHz microwave detection to verify movement. Requiring confirmation from both technologies can improve alarm accuracy and reduce nuisance events compared with a basic single-technology detector.
12 Metre Indoor Coverage
The detector covers up to 12 metres across a 90° angle when mounted at approximately 2.2 metres. This suits living areas, offices, hallways, shops and other medium-sized indoor spaces.
Pet Immunity up to 18 kg
The detector can reduce alarms caused by pets weighing up to approximately 18 kg and measuring less than 50 cm in height. Correct mounting and room layout remain essential for reliable pet immunity.
Three Sensitivity Levels
Adjustable sensitivity allows the detector response to be matched more closely to the room and expected activity. The final setting should be confirmed through a walk test after mounting.
Secure Two-Way Wireless Communication
Two-way communication, frequency hopping, RF interference detection and AES-128 encryption help maintain a stable and protected connection with a compatible Dahua wireless alarm hub.
Temperature and Device Monitoring
The detector can report the surrounding temperature, support overheating alarms and provide low-battery and tamper notifications through the connected alarm system.
Best For
- Homes with Small Pets: Suitable for indoor areas where animals weighing up to approximately 18 kg may move while the system is armed.
- Living Rooms and Hallways: Provides broad 12 metre coverage for common residential movement paths.
- Retail Stores: Helps monitor customer-facing areas, stockrooms and internal access zones after hours.
- Offices: Suitable for reception areas, corridors, meeting rooms and shared workspaces.
- Wireless Alarm Upgrades: Adds dual-technology motion detection to compatible Dahua wireless alarm systems without new detector cabling.
Why Choose the DHI-ARD2231-W2
The DHI-ARD2231-W2 is a practical choice when a wireless alarm system needs more reliable indoor motion verification than a basic PIR-only sensor can provide. Its PIR and microwave technologies work together to confirm movement, while three sensitivity settings and automatic temperature compensation allow the detector to be adapted to different indoor environments. Pet immunity is particularly useful in homes with small animals, provided the detector is mounted correctly and furniture does not allow pets to enter the more sensitive parts of the coverage pattern. Available through Security Wholesalers, this model also supports tamper reporting, low-battery alerts, temperature monitoring, encrypted two-way communication and cloud updates. It should be selected only for a compatible Dahua wireless alarm hub using the correct regional frequency variant.
Buyer Decision Tips
Buyer Tip: Confirm the wireless frequency variant and alarm-hub compatibility before ordering. Wireless alarm devices must use the same supported regional frequency as the connected Dahua hub.
Buyer Tip: Pet immunity depends on installation geometry. Mount the detector at approximately 2.2 metres and avoid aiming it towards stairs, furniture or shelves that allow animals to move closer to the sensor.
Key Features & Technical Specifications
| Product Type |
Wireless indoor dual-technology motion detector. |
| Model |
DHI-ARD2231-W2. |
| Detection Technology |
Dual-element low-noise PIR sensor and microwave sensor. |
| Detection Mode |
PIR plus microwave. |
| Microwave Frequency |
24 GHz. |
| Detection Range |
Up to 12 metres. |
| Detection Angle |
90°. |
| Recommended Installation Height |
Approximately 2.2 metres. |
| Detection Speed |
0.3 m/s to 3 m/s. |
| Sensitivity |
Three adjustable levels. |
| Pet Immunity |
Up to approximately 18 kg and below 50 cm in height. |
| White-Light Resistance |
Up to 2,000 lux. |
| Temperature Compensation |
Two-way digital automatic temperature compensation. |
| Temperature Measurement |
-15°C to 65°C for indoor environmental monitoring. |
| Tamper Protection |
Supported. |
| Low-Battery Detection |
Supported. |
| Communication Type |
Two-way wireless communication. |
| Wireless Security |
AES-128 encryption, frequency hopping and RF interference detection. |
| Communication Distance |
Up to 1,600 metres in open space for the 868 MHz variant. |
| Remote Update |
Cloud firmware update with automatic recovery support. |
| Power Supply |
1 × CR123A battery. |
| Battery Life |
Up to 3 years under stated typical operating conditions. |
| Operating Current |
Approximately 11 µA. |
| Alarm Current |
Approximately 71 mA. |
| Maximum Power Consumption |
615 mW. |
| Operating Temperature |
-10°C to 55°C indoors. |
| Operating Humidity |
10% to 90% relative humidity. |
| Installation |
Indoor wall mounting. |
| Casing Material |
PC and ABS. |
| Dimensions |
104 mm × 60 mm × 50 mm. |
| Net Weight |
Approximately 106 g. |
| Certification |
CE. |
Ideal Use Cases
Living Rooms
Provides broad indoor motion coverage while helping reduce alarms caused by appropriately sized pets.
Hallways
Monitors common movement paths between entrances, bedrooms and other protected areas.
Retail Floors
Dual-technology detection suits shops requiring more dependable after-hours movement verification.
Office Areas
Suitable for meeting rooms, reception areas, corridors and shared internal workspaces.
Stockrooms
Helps detect movement inside secured storage and back-of-house areas when the alarm is armed.
Wireless Alarm Extensions
Adds motion protection to compatible Dahua alarm systems without requiring detector cabling.
Choosing the Right Model
- Choose this model if: The system needs wireless indoor PIR and microwave detection, 12 metre coverage and pet immunity up to approximately 18 kg.
- Choose a PIR-only detector if: The installation does not require dual-technology alarm verification and lower power consumption is the main priority.
- Choose a camera detector if: The alarm system requires captured images or video verification when motion is detected.
- Choose an outdoor detector if: The sensor will be exposed to rain, direct sunlight, large temperature changes or external movement conditions.
FAQs
- What detection technology does the Dahua DHI-ARD2231-W2 use?
The DHI-ARD2231-W2 combines a dual-element passive infrared sensor with a 24 GHz microwave sensor. Using both technologies helps the detector verify movement more reliably than a basic PIR-only device and can reduce false alarms caused by temperature changes, moving air or other environmental interference.
- What is the detection range of the DHI-ARD2231-W2?
The detector provides coverage up to 12 metres across a 90-degree angle when installed at the recommended height of approximately 2.2 metres. Actual coverage depends on room layout, furniture, mounting angle and sensitivity settings, so the detection area should be walk-tested after installation.
- Is the DHI-ARD2231-W2 suitable for homes with pets?
Yes. The DHI-ARD2231-W2 supports pet immunity for animals weighing up to approximately 18 kg and below about 50 cm in height. Reliable pet immunity depends on correct mounting height, detector angle and keeping furniture or climbing points away from the protected area.
- How long does the battery last in the DHI-ARD2231-W2?
The detector uses one CR123A battery and has a stated battery life of up to three years under typical operating conditions. Actual battery life depends on alarm frequency, wireless signal quality, temperature, communication activity and configuration. The system supports low-battery reporting for maintenance planning.
- Does the DHI-ARD2231-W2 support tamper and interference detection?
Yes. The detector supports tamper protection, RF interference detection, two-way wireless communication, frequency hopping and AES-128 encryption. These functions help protect the device and improve communication reliability when it is enrolled with a compatible Dahua wireless alarm hub.
- What should be checked before buying the DHI-ARD2231-W2?
Confirm the wireless frequency variant, compatible Dahua alarm hub, intended indoor mounting position, 2.2-metre installation height and required 12-metre coverage before ordering. The DHI-ARD2231-W2 is available through Security Wholesalers for compatible Dahua wireless alarm systems, but it should not be treated as a standalone alarm device.
Additional Information
Dahua DHI-ARD2231-W2_Datasheet
