Audible & Visual Alarm for Gas Detection | Chemical Safety Component

Q: What is the typical power supply for this alarm?

The rated voltage is 24 V DC with a tolerance of ±10%. AC versions are also available. Power consumption is ≤5 W at rated voltage. Confirm the exact supply requirements with the manufacturer for your model.

Q: Can the alarm be used in explosive atmospheres?

Yes, explosion-proof versions are available with rating Ex d IIC T6 per IEC 60079-1, suitable for gas group IIC and temperature class T6. The operating temperature range for these versions is -40 to 85 °C. Always verify the specific certification for your installation.

Q: What is the sound output level?

The sound output is 85–105 dB(A) at 1 meter distance, measured according to IEC 61672-1. This ensures a loud audible alert in noisy environments. Check the exact output for your model.

Q: What is the ingress protection rating?

The alarm has an ingress protection rating of IP65 to IP67 per IEC 60529, meaning it is dust-tight and protected against water jets. This makes it suitable for harsh industrial environments. Confirm the exact rating for your unit.

Product Specifications

Technical details and manufacturing context for Audible & Visual Alarm

Definition

The Audible & Visual Alarm is an integrated component of a Gas Detection System used in chemical manufacturing environments. It is designed to alert personnel to hazardous gas concentrations by simultaneously emitting loud audible signals and bright visual indicators, typically flashing lights. This dual-alarm approach ensures immediate awareness even in noisy or visually obstructed areas, enhancing workplace safety.

The alarm operates by receiving electrical signals from gas detectors when preset concentration thresholds are exceeded. Upon activation, it triggers a piezoelectric or electromagnetic sounder for audible alerts and high-intensity LED or strobe lights for visual warnings. The device is housed in a polycarbonate enclosure with an aluminum alloy frame, providing durability and resistance to industrial conditions.

Key parameters include a rated voltage of 24 V DC (±10%), with AC versions available, and power consumption of ≤5 W at rated voltage. The sound output ranges from 85 to 105 dB(A) at 1 meter, conforming to IEC 61672-1. The flash rate is adjustable between 60 and 120 flashes per minute. For LED types, luminous intensity is ≥100 cd, per IEC 60079-0. The operating temperature range is -40 to 85 °C for explosion-proof versions. Ingress protection is rated IP65 to IP67, per IEC 60529, ensuring dust-tight and water-jet protection. The explosion-proof rating is Ex d IIC T6, per IEC 60079-1, suitable for gas group IIC and temperature class T6. The housing material is stainless steel 316L, per ASTM A240. Weight varies from 1.5 to 3.5 kg depending on configuration, and typical dimensions are 150×120×80 mm (H×W×D) for the compact model. Cable entries are M20×1.5, with two entries standard, per IEC 62444.

These specifications serve as reference ranges; actual values must be confirmed with the manufacturer for the specific model and application. Standards listed are for verification purposes and do not imply certification of any particular product. Always verify model-specific data and compliance with the legal manufacturer or supplier.

Working Principle

The alarm receives electrical signals from gas detectors when preset concentration thresholds are exceeded. This triggers a piezoelectric or electromagnetic sounder to produce a loud audible alert, and high-intensity LED or strobe lights to emit a visual warning. The simultaneous activation ensures personnel are alerted even in high-noise or visually obstructed environments. The device operates within specified voltage and temperature ranges, and its explosion-proof design prevents ignition in hazardous atmospheres.

Common Materials

Polycarbonate housing, Aluminum alloy frame, Electronic components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	24 ±10% V DC	AC versions available
Power Consumption	≤5 W	At rated voltage
Sound Output	85–105 dB(A)	At 1 m distanceIEC 61672-1
Flash Rate	60–120 min⁻¹	Adjustable
Luminous Intensity	≥100 cd	For LED typeIEC 60079-0
Operating Temperature	-40–85 °C	For explosion-proof type
Ingress Protection	IP65–IP67	Dust-tight and water-jet protectedIEC 60529
Explosion-proof Rating	Ex d IIC T6	Gas group IIC, temp class T6IEC 60079-1
Housing Material	316L	Stainless steelASTM A240
Weight	1.5–3.5 kg	Depends on configuration
Dimensions (H×W×D)	150×120×80 mm	Typical for compact model
Cable Entry	M20×1.5	Two entries standardIEC 62444

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Piezoelectric Sounder
Generates high-decibel audible alarm tones

Material: Piezoelectric ceramic
LED Array
Produces bright, flashing visual warnings

Material: High-intensity LEDs
Control Circuit Board
Processes input signals and controls alarm activation

Material: FR-4 PCB with electronic components
Protective Housing
Encloses and protects internal components from environmental factors

Material: Impact-resistant polycarbonate

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	0.9 to 1.1 atm
other spec:	Gas concentration detection range: 0-100% LEL/ppm, Response time: <30 seconds, IP rating: IP65
temperature:	-20°C to +60°C

Media Compatibility

✓ Natural gas monitoring ✓ Industrial solvent vapor detection ✓ Confined space entry systems

Unsuitable: High particulate/dust environments without filtration

Sizing Data Required

Target gas type and concentration range
Required alarm sound level (dB) and visual intensity (candela)
Area coverage/volume of monitored space

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Sensor Drift/Calibration Loss

Cause: Environmental factors (temperature, humidity), component aging, or contamination leading to inaccurate signal detection and false alarms or missed events.

Power Supply Failure

Cause: Voltage spikes, poor wiring connections, or battery degradation (if applicable) resulting in complete system shutdown or intermittent operation.

Maintenance Indicators

Intermittent or continuous false alarms without an identifiable trigger, indicating sensor or logic circuit malfunction.
No audible/visual output during a known alarm condition (e.g., test failure), signaling power loss, speaker/LED failure, or control system fault.

Engineering Tips

Implement a routine calibration and functional test schedule using standardized procedures to verify sensor accuracy and alarm response thresholds.
Install surge protection devices and ensure clean, stable power sources with backup systems (e.g., UPS) to prevent electrical damage and maintain reliability.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

ISO 7731:2008 - Ergonomics - Danger signals for public and work areas - Audible danger signals ANSI/UL 464 - Standard for Audible Signal Appliances DIN EN 54-3:2014 - Fire detection and fire alarm systems - Part 3: Fire alarm devices - Sounders

Quoted from the published standard.

Manufacturing Precision

Sound pressure level: +/- 3 dB at specified distance
Visual alarm flash rate: +/- 10% of specified frequency

Quality Inspection

Acoustic performance test (decibel measurement at specified distances)
Environmental durability test (IP rating verification for dust/water resistance)

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Audible & Visual Alarm

5 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hunan HKT Technology Co., Ltd.

Changsha, Hunan, CN

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