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Dahua

Wireless Smoke Alarm

Name: Wireless Smoke Alarm
Brand: Dahua
SKU: HY-SA21A-W2

Stock Code: HY-SA21A-W2

Detects smoke early and wakes the home with a loud alert.

A ceiling mounted wireless photoelectric smoke alarm. The split-spectrum sensor samples the smoke chamber at a steady interval and gives both an audible and a visual alert once the threshold is passed.

PhotoelectricSensor type

85–90 dB(A)Alarm volume

3 yearsBattery life

3V CR123APower options

-10°C to +55°COperating Temperature

Ceiling mountInstallation Type

Key features

85dB(A)

Loud alert

The alarm sounds above 85 dB(A) at 3 meters and wakes people from sleep.

3years

Long battery life

The CR123A lithium battery lasts three years, and the user replaces it.

40m²

Wide coverage

In spaces under 8 meters high, one device protects an area of 20 m² to 40 m².

1000m

Wireless range

In open space the alarm sets up a two-way wireless link up to 1000 meters.

10s

Short sampling period

The device samples the smoke chamber every ten seconds and alarms when density passes the threshold.

IN DAILY USE

One buttonThe same button starts the test and silences the alarm, and the silence lasts about 12 minutes.

Color indicatorThe green light marks standby, and the red light marks alarm and fault states.

Encrypted wireless linkAES128 encryption and frequency hopping protect the wireless communication.

Complies with EN 14604:2005+AC:2008.

Working Principle
Collection Type	Smoke
Sampling Period	10 s
Sensor Type	Photoelectric
Alarm
Alarm Type	Smoke alarm, fault warning, low battery warning
Alarm Volume	85dB–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
Basic Parameters
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 m²–40 m²
Power Supply
Battery Life	3 years
Operating Voltage	3V CR123A lithium battery (replaceable)
Operating Current	Monitoring current: ≤ 35uA Alarm current: ≤ 35mA
Operating Ambient
Operating Environment	Indoor
Operating Temperature	-10°C to +55°C (+14°F to +131°F)
Operating Humidity	≤ 95% RH (non-condensing)
Appearance
Color	White
Casing	ABS
Dimensions	φ98 mm × H43.1 mm (φ3.85" × H1.70")
Weight	140 g (0.30 lb)
Installation	Ceiling Mount
Certifications
Certifications	TÜV and CE listed
Compliance Standard	EN 14604:2005+AC:2008
Wireless
Carrier Frequency	433.1 MHz–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

Datasheet

HY-SA21A-W2

pdf10/28/2022

HY-SA21A-W2

pdf10/28/2022

Firmware

HY-SA21A-W2

zip10/28/2022

Kullanım Kılavuzu

HY-SA21A-W2

pdf10/28/2022

Teknik Çizim

HY-SA21A-W2

pdf10/28/2022

HY-SA21A-W2

pdf10/28/2022

Fotoğraf

HY-SA21A-W2

png3/20/2025

HY-SA21A-W2

png3/20/2025

Wireless Smoke Alarm

Stock Code: HY-SA21A-W2

Detects smoke early and wakes the home with a loud alert.

PhotoelectricSensor type

85–90 dB(A)Alarm volume

3 yearsBattery life

3V CR123APower options

-10°C to +55°COperating Temperature

Ceiling mountInstallation Type

Key features

85dB(A)

Loud alert

The alarm sounds above 85 dB(A) at 3 meters and wakes people from sleep.

3years

Long battery life

The CR123A lithium battery lasts three years, and the user replaces it.

40m²

Wide coverage

In spaces under 8 meters high, one device protects an area of 20 m² to 40 m².

1000m

Wireless range

In open space the alarm sets up a two-way wireless link up to 1000 meters.

10s

Short sampling period

The device samples the smoke chamber every ten seconds and alarms when density passes the threshold.

IN DAILY USE

One buttonThe same button starts the test and silences the alarm, and the silence lasts about 12 minutes.

Color indicatorThe green light marks standby, and the red light marks alarm and fault states.

Encrypted wireless linkAES128 encryption and frequency hopping protect the wireless communication.

Complies with EN 14604:2005+AC:2008.

Working Principle
Collection Type	Smoke
Sampling Period	10 s
Sensor Type	Photoelectric
Alarm
Alarm Type	Smoke alarm, fault warning, low battery warning
Alarm Volume	85dB–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
Basic Parameters
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 m²–40 m²
Power Supply
Battery Life	3 years
Operating Voltage	3V CR123A lithium battery (replaceable)
Operating Current	Monitoring current: ≤ 35uA Alarm current: ≤ 35mA
Operating Ambient
Operating Environment	Indoor
Operating Temperature	-10°C to +55°C (+14°F to +131°F)
Operating Humidity	≤ 95% RH (non-condensing)
Appearance
Color	White
Casing	ABS
Dimensions	φ98 mm × H43.1 mm (φ3.85" × H1.70")
Weight	140 g (0.30 lb)
Installation	Ceiling Mount
Certifications
Certifications	TÜV and CE listed
Compliance Standard	EN 14604:2005+AC:2008
Wireless
Carrier Frequency	433.1 MHz–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