- Stock: approx. 3~5 work days
- Model: SD150DCNNARDN
SD150DCNNARDN Explosion Proof Sounder – 12–48V DC, M20, Red (GRP)
SD150DCNNARDN is a high-output explosion proof sounder (horn) for hazardous-area audible alarms. This specific variant is listed with a 12–48V DC supply, 113 dB sound output, an M20 cable entry, and a high-visibility red GRP enclosure.
It is a strong choice for industrial sites where alarms must be heard clearly in tough conditions, including oil & gas, petrochemical, offshore and marine environments. For best results, select the sounder to match your site’s zone classification and project standards.
Safety & compliance: Hazardous-area equipment selection and installation must be carried out by competent personnel and must match site zoning, gas/dust group and temperature class requirements.
Key benefits for hazardous-area audible signalling
High-output audible warning
Delivers a loud alarm signal to cut through challenging plant noise, supporting faster response in critical situations. Rated at 113 dB for this listed variant.
Wide 12–48V DC compatibility
A broad DC operating range helps standardise spares and simplify system design across mixed-voltage industrial skids and panels.
M20 cable entry for practical site wiring
The M20 entry supports typical hazardous-area cable gland practices and tidy mechanical integration.
Red GRP enclosure for visibility
The red GRP body keeps signalling hardware clearly identifiable on site and supports durable use in industrial environments.
Flexible alarm signalling strategy
The SD150 platform supports multi-stage alarm signalling with selectable tones (ideal when you need distinct “alert / alarm / evacuate” patterns).
Engineered for harsh hazardous locations
Designed for potentially explosive atmospheres and harsh environmental conditions commonly found in oil & gas, chemical, petrochemical, refineries and marine locations.
Where SD150DCNNARDN is typically specified
Explosion-proof sounders are commonly specified where visual beacons are not enough and where operators need an unmissable audible signal. Typical sectors include upstream and downstream energy, chemical processing, refineries, offshore platforms and marine operations.
Common use cases
- General alarm / plant alarm / muster and evacuation signalling
- Process alarms in hazardous production zones
- Skid-mounted systems requiring a robust, high-output audible device
- Marine or offshore areas with high background noise
Selection reminder: Always verify the sounder marking on the unit and confirm it matches your site’s hazardous area classification and engineering standards before installation.
Configuration and commissioning notes
The SD150 electronic sounder platform is designed to support clear, structured audible signalling in challenging environments. Tones can be selected and pre-set during installation, supporting consistent site-wide alarm patterns.
Practical configuration highlights (platform capability)
- 3-stage alarm operation with multiple selectable tones (choose distinct tones for different alarm levels)
- Tone selection can be pre-set during installation
- Optional telephone initiation function for very noisy environments (where used as a secondary ring/indicator)
- Design allows for termination inside the enclosure
- Sounder supplied with a mounting bracket as standard
- Volume control support for site tuning
Good practice: Document your chosen tone(s) and stage mapping in the site cause-and-effect / alarm philosophy, then replicate consistently across units to reduce confusion during real incidents.
Professional tips for faster, cleaner installations
Confirm the hazardous-area framework before you mount anything
In the EU, equipment intended for potentially explosive atmospheres is governed by the ATEX Equipment Directive (2014/34/EU), and organisations should ensure correct selection, conformity and documentation. In Great Britain, the corresponding regulations implement the same equipment-focused requirements.
Plan cable entry, glands and routing
This variant is specified with an M20 cable entry. Use suitable Ex-rated glands/blanking plugs appropriate for your cable type and area classification, and maintain correct sealing and mechanical strain relief from the first fix.
Mounting and audibility
- Position the horn for the best line-of-sight sound path to the working area (avoid placing behind steelwork or deep recesses).
- Keep clear of surfaces that can reflect or “shadow” the sound field at operator level.
- Where background noise is high, confirm audibility during commissioning and document the test result.
Commissioning checklist (quick): verify polarity and DC supply stability → confirm selected tone/stage logic → confirm audibility at typical operator positions → record test results in maintenance documentation.
FAQ
What exactly is SD150DCNNARDN?
It is an explosion-proof electronic sounder (horn) variant listed as 12–48V DC, 113 dB output, with an M20 cable entry and red GRP enclosure.
Is it suitable for hazardous areas (ATEX)?
It is positioned as an ATEX explosion-proof sounder for hazardous industrial environments. Suitability must always be verified against your specific zone classification and the equipment marking on the unit.
Can I select different alarm tones?
Yes. The SD150 platform supports selectable tones and multi-stage alarm signalling. Tones can be pre-set during installation, supporting consistent site-wide alarm patterns.
Does the SD150 platform support multi-stage alarm signalling?
Yes. It is designed around a multi-stage alarm concept to help you separate alert levels (for example: warning vs. evacuation), depending on your alarm philosophy.
Is termination/connection possible inside the enclosure?
The design allows for termination inside the enclosure, supporting practical and protected wiring in industrial installations.
Is a mounting bracket included?
The sounder platform is supplied with a mounting bracket as standard, simplifying mechanical installation.
What does “M20” mean here?
It refers to the cable entry thread size specified for this variant. Ensure the gland/plug you choose is suitable for M20 and certified for your hazardous-area requirements.
Can it be used with a telephone initiation function?
The SD150 platform can be fitted with a telephone initiation function and can be used as a second-ring indicator in very noisy environments, where specified by your design.
Specify with confidence: high-output hazard-area audible alarms
SD150DCNNARDN is designed for engineers and maintenance teams who need a robust explosion-proof sounder with clear ordering identity: 12–48V DC, 113 dB, M20 entry, red GRP. Use it to build consistent, audible alarm coverage across hazardous sites.
