Dahua ARD2251E-W2 Outdoor Triple-Tech Motion Detector

Overview

The Dahua ARD2251E-W2 is an outdoor wireless motion detector for Dahua 433 MHz alarm systems. It combines passive infrared (PIR) and 24 GHz microwave sensing, and it reports when someone tries to cover or move it, so the alarm sounds while an intruder is still in the garden, driveway or yard rather than after they reach the building. It suits homes, villas, shops and small warehouses.

Is it right for you?

• Choose it to guard gardens, driveways, warehouse yards, rooftops and the outside walls of a shop or villa.
• Pets up to about 40 kg and under 80 cm are ignored, so it suits homes with a large dog.
• It can also be used indoors in harsh areas such as a loading bay.
• If you want a snapshot of what triggered it, choose the camera version ARD2251E-W2(V).
• Open ground near a road, swaying plants or moving water can cause false triggers, so plan where it points.

Key features

• PIR plus 24 GHz microwave detection across 90 degrees to 15 m when mounted at 1 m.
• Anti-masking and movement detection: covering or removing the detector is reported as well as intrusion.
• Pet immunity up to about 40 kg and 80 cm height.
• White light resistance up to 10,000 lux, so sunlight and headlights are less likely to trigger it.
• IP66 housing in glass-filled polycarbonate, rated from -25 to 60 °C.
• Two-way 433 MHz radio with up to 1,200 m range in open space, frequency hopping and AES128 encryption.
• Dual firmware backup with automatic recovery if a cloud update fails.
• Four CR123A batteries, rated for about 5 years at 10 alarms a day.

What else you need

A Dahua 433 MHz wireless alarm hub, such as the ARC3000H, and the Dahua app for configuration.

A repeater if the detector is far from the hub, for example across a large compound.

Four CR123A batteries.

Installation

An alarm installer should survey the area and fit it. It mounts on a wall or pole at 0.8 to 1.3 m, which is lower than an indoor detector.

A detection range adjustment switch and three PIR sensitivity levels let the installer tune coverage for the space.

Point it away from roads, swaying plants and moving water to limit false triggers.

Before you buy

The 15 m range is specified at a 1 m mounting height; mounting outside the 0.8 to 1.3 m band changes coverage.

Battery life depends on how often it triggers; a busy driveway will shorten the 5-year rating.