The MEIDI BJ-1234 110dB Electronic Alarm Siren is an electronic alarm siren designed for audible warning and alert applications. Available in 12VDC, 24VDC, and 220V AC rated voltage options, it produces a 2500Hz warning tone with Min. 110dB sound pressure output.
The BJ-1234 features a NORYL housing with a Φ54±0.3mm diameter and approximately 52.8mm height. Depending on the voltage option, the unit weighs 50g or 61g. The wire-lead connection and integrated mounting configuration suit panel or surface mounting in industrial, security, and commercial alarm systems.
High SPL output — Min. 110dB sound pressure for attention-critical alarm applications
Multiple voltage options — 12VDC, 24VDC, and 220V AC variants for DC and mains-powered systems
2500Hz warning tone — factory-set warning tone frequency
NORYL housing — high-temperature thermoplastic housing
Panel-mount form factor — Φ54mm body with mounting holes for chassis installation
| Parameter | BJ-1 (12V) | BJ-2 (24V) | BJ-3 (220V AC) | Test Conditions |
| Product Type | Electronic Alarm / Siren | Electronic Alarm / Siren | Electronic Alarm / Siren | — |
| Rated Voltage | 12 VDC | 24 VDC | 220 VAC | — |
| Operating Voltage | 8~15 VDC | 18~28 VDC | 200~250 VAC | Supply range |
| Rated Frequency | 2500 Hz | 2500 Hz | 2500 Hz | At rated voltage |
| Tone Nature | Warning tone | Warning tone | Warning tone | — |
| Mean Current Consumption | Max. 97 mA | Max. 110 mA | Max. 105 mA | At rated voltage |
| Sound Pressure Level | Min. 110 dB | Min. 110 dB | Min. 110 dB | At rated voltage |
| Operating Temperature | -20℃ ~ +70℃ | -20℃ ~ +70℃ | -20℃ ~ +70℃ | Continuous |
| Storage Temperature | — | — | — | Not specified |
| External Dimensions | Φ54 ±0.3 × 52.8 mm | Φ54 ±0.3 × 52.8 mm | Φ54 ±0.3 × 52.8 mm | Per dimension drawing |
| Mounting Hole Spacing | 25 mm / 41 mm | 25 mm / 41 mm | 25 mm / 41 mm | Per dimension drawing |
| Wire Length | 130 ±0.5 / 135 ±0.5 mm | 130 ±0.5 / 135 ±0.5 mm | 130 ±0.5 / 135 ±0.5 mm | Per dimension drawing |
| Mass | 50 g | 50 g | 61 g | — |
| Housing Material | NORYL | NORYL | NORYL | — |
| Environmental Compliance | RoHS | RoHS | RoHS | — |
Industrial alarm systems — machine fault, process hazard, and emergency stop alerts
Security and intrusion systems — perimeter breach and unauthorized access warnings
Fire and evacuation panels — audible notification in commercial and industrial buildings
Automation equipment — status and fault alarms in control panels
Mains-powered warning devices — 220V AC variant for direct mains connection
| Design Requirement | BJ-1234 Advantage |
| High SPL alert | Min. 110dB output for high-ambient-noise environments |
| DC and AC options | 12VDC, 24VDC, and 220V AC variants cover common supply configurations |
| Panel mounting | Φ54mm housing with mounting holes for secure installation |
| Warning tone | 2500Hz factory-set warning tone |
| Robust housing | NORYL housing for industrial applications |
MEIDI manufactures the BJ-1234 110dB Electronic Alarm Siren under controlled production processes. Each production lot undergoes:
Frequency verification — operating frequency test at 2500Hz
SPL verification — sound pressure verification at rated voltage
Current consumption test — Max. 97–110mA check depending on voltage option
Dimensional inspection — Φ54±0.3mm body and mounting-hole layout check
Environmental compliance — RoHS material verification
Products are manufactured with RoHS-compliant materials. Contact MEIDI for detailed quality documentation and test reports.
1. What voltage options are available for the BJ-1234?
The source specification lists three voltage options: 12VDC (BJ-1), 24VDC (BJ-2), and 220V AC (BJ-3). Each option has a corresponding operating voltage range, current consumption, and mass. Select the option that matches your system supply.
2. What is the sound pressure level of the BJ-1234?
The source specification lists Min. 110dB sound pressure level at rated voltage for all three voltage options. Contact MEIDI for detailed acoustic test conditions and distance-versus-SPL data.
3. Why does the source specification mention square-wave test conditions?
The source specification lists test values applying rated voltage at 2500Hz with 1/2 duty square wave. The BJ-1234 is an electronic alarm designed for DC or AC operation. The square-wave test condition is per the source test protocol. Contact MEIDI for DC/AC drive characterization data.
4. What are the mounting dimensions of the BJ-1234?
The dimension drawing shows a Φ54±0.3mm diameter body with approximately 52.8mm height. Mounting holes and wire leads are shown for panel or surface mounting. Contact MEIDI for the official mechanical drawing.
5. What is the operating temperature range of the BJ-1234?
The source specification lists an operating temperature range of -20℃ to +70℃. Storage temperature is not specified; contact MEIDI for storage and handling recommendations.
For technical datasheets, voltage-variant samples, acoustic coverage data, or OEM configuration discussion, contact MEIDI. Product specifications and qualification documentation are available under mutual NDA.
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No.6, Wenlin Road, Chenbao Town, Xinghua City, Jiangsu Province, China
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