At a glance
- Battery Life
- 3 year
- Operating Temperature
- -10 °C to +55°C
- Installation
- Ceiling Mount
- Dimensions
- φ98 mm × H43.1 mm
- Carrier Frequency
- 433.1 MHz to 434.6 MHz
- Communication Distance
- Up to 1000 m (3280.84 ft) in an open space
Model HY-SA21A-W2Dahua HY-SA21A-W2 Wireless Smoke Detector with Sounder
₹4,141 Incl. GST
₹3,509 + 18% GST
At a glance
- Battery Life
- 3 year
- Operating Temperature
- -10 °C to +55°C
- Installation
- Ceiling Mount
- Dimensions
- φ98 mm × H43.1 mm
- Carrier Frequency
- 433.1 MHz to 434.6 MHz
- Communication Distance
- Up to 1000 m (3280.84 ft) in an open space
Ceiling smoke alarm that sounds its own 85 dB siren and also alerts your phone through a Dahua wireless alarm hub, for bedrooms, corridors, shops and offices. Photoelectric sensor checking every 10 s, EN 14604, battery powered.
- WarrantyManufacturer warranty under Dahua's terms. Warranty claims
- DeliveryPrice, availability and delivery charges are confirmed in your quotation. Shipping and delivery
- InstallationCeiling Mount
Overview
The Dahua HY-SA21A-W2 is a wireless smoke alarm. A photoelectric sensor samples the air every 10 seconds and, when it detects smoke, the unit sounds its own built-in siren and reports to a Dahua wireless alarm hub so you are alerted on your phone. Fit it on the ceiling in a bedroom, corridor, living area, server cupboard, shop or small office to add fire warning to a Dahua wireless intrusion alarm without running fire cable.
Is it right for you?
- It suits a home or small office that already has, or is adding, a Dahua 433 MHz wireless alarm hub.
- One unit protects about 20 to 40 m² in a space under 8 m high, so plan one per room or corridor section.
- It is a residential-style standalone smoke alarm, not a replacement for a code-compliant addressable fire alarm system in a commercial building.
- For a wired intrusion panel, the FAD201A 4-wire smoke detector is the matching detector.
- Indoor use only, -10 to 55 °C.
Key features
- Photoelectric smoke sensor with 10 second sampling.
- Built-in sounder of 85 to 90 dB(A) at 3 m, with red and green status LEDs.
- Single test and silence button; silence lasts about 12 minutes.
- Coverage of about 20 to 40 m² in spaces under 8 m high.
- Complies with EN 14604, the standard for smoke alarm devices.
- Two-way 433 MHz radio with frequency hopping and AES128 (Advanced Encryption Standard) encryption, up to 1,000 m in open space.
- Replaceable 3 V CR123A lithium battery rated for about 3 years, with a low battery warning and fault warning.
- Compact 98 mm diameter, 43.1 mm high, 140 g, in white ABS.
What else you need
A Dahua 433 MHz wireless alarm hub, such as the ARC3000H, to receive app notifications, and one CR123A battery.
Installation
An alarm installer can fit it, and a confident owner can manage a home. Fix it to the ceiling away from corners and vents, fit the battery, pair it with the hub in the Dahua app and press the test button to confirm the sounder and the hub link.
Software and licences
Pairing and notifications use the Dahua app through the hub.
Before you buy
- Not a substitute for a code-compliant fire alarm system in a commercial building; check local fire rules.
- Each unit covers about 20 to 40 m², so larger areas need more units.
- Indoor use only.
Technical specifications
Key facts
- What is it?
- Fire & Environmental DetectorsBrand Dahua, model HY-SA21A-W2
- How is it powered?
- 3 V CR123A lithium battery (replaceable)
- Can it be used outdoors?
- Indoor
- Which documents are available?
- Datasheet, user manual, installation / drawing (2), online specifications Open documents
- Can SecurityGearHub help with installation?
- Setup guidanceManuals, wiring guides and answers to setup questions. On-site work is arranged separately where available. Ask about installation
- Not stated by the manufacturer
- box contents
RelatedDocumentsAll Dahua documents
General
- Model
- HY-SA21A-W2
- Collection Type
- Smoke
- Sampling Period
- 10 s
- Sensor Type
- Photoelectric
- Alarm Type
- Smoke alarm, fault warning, low battery warning
- Alarm Volume
- 85 dB to 90dB(A) at 3 m (9.84 ft)
- Alarm Mode
- Visual and audible alarm
- Silence Function
- Yes
- Silence Duration
- About 12 min
- Alarm Response Threshold
- 0.2 dB/m - 0.3 dB/m
- Indicator Light
- Red and green LED indicator
- Led Instructions
- Standby: Green indicator flashes once per minute Alarm: Red indicator flashes once per second Fault: Red indicator flashes once per minute Low battery warning: Red indicator flashes once per minute
- Coverage Area
- When the height of the space is less than 8 m (26.25 ft), the protection area of a device is 20 m2 to 40 m2
- Operating Current
- Monitoring current: ≤ 35uA Alarm current: ≤ 35 mA
- Casing
- ABS
- Installation
- Ceiling Mount
- Carrier Frequency
- 433.1 MHz to 434.6 MHz
- Communication Distance
- Up to 1000 m (3280.84 ft) in an open space
- Communication Mechanism
- Two-way
- Frequency Hopping
- Yes
- Encryption Mode
- AES128
Input
- Battery Life
- 3 year
- Operating Voltage
- 3 V CR123A lithium battery (replaceable)
Environment
- Operating Environment
- Indoor
- Operating Temperature
- -10 °C to +55°C (+14°F to +131°F)
- Operating Humidity
- ≤ 95% RH (non condensing)
Physical
- Colour
- White
- Dimensions
- φ98 mm × H43.1 mm (φ3.85" × H1.70")
- Weight
- 140 g (0.30 lb)
Approvals
- Certifications
- TÜV and CE
- Compliance Standard
- EN 14604:2005+AC:2008
- Warranty
- Manufacturer warranty under Dahua's terms. How claims work
Product attributes and shipping details
| Brand | Dahua |
|---|---|
| Environment | Indoor |
| Radio Frequency | 433.1 MHz–434.6 MHz |
Downloads
Documentation
- Dahua HY-SA21A-W2 datasheetDatasheet · This model · 358.4 KBDownload
- Dahua HY-SA21A-W2 product pageOnline specifications · This model · dahuasecurity.comView official page
User manual
- Users Manual DHI-HY-SA21A-W2(868)User manual · This model · materialfile.dahuasecurity.comDownload
Installation guide
- Installation drawing: Dahua HY-SA21A-W2 Wireless Smoke Detector with Sounder (dimensions)Installation / drawing · This model · materialfile.dahuasecurity.comDownload
- Installation drawing: Dahua HY-SA21A-W2 Wireless Smoke Detector with SounderInstallation / drawing · This model · materialfile.dahuasecurity.comDownload
Series documents can differ from your exact model. Report a wrong or missing file
Questions about this product
Does it sound an alarm on its own?
Yes. The built-in sounder gives 85 to 90 dB(A) at 3 m, and the hub also sends an alert to your phone.
How long does the battery last?
About 3 years on one replaceable 3 V CR123A lithium battery, with a low battery warning.
How much area does one cover?
About 20 to 40 m² in a space under 8 m high.
Can I silence a nuisance alarm?
Yes. The test and silence button mutes it for about 12 minutes.
Does it need an internet connection?
The hub needs its connection for phone alerts. The alarm itself talks to the hub by 433 MHz radio and sounds locally regardless.
Does it meet a smoke alarm standard?
Yes. It complies with EN 14604.
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