The WERMA Model 444.110.75 Combined LED-EVS Multi-Tone Sounder (Series 444), engineered and manufactured by WERMA Signaltechnik GmbH + Co. KG in Rietheim-Weilheim, Germany, is a heavy-duty industrial visual-audible signalling solution designed to deliver immediate, fail-safe alarm notification in demanding industrial automation environments.

In loud manufacturing halls with continuous machine clatter and bright ambient lighting, conventional constant or blinking warning lights often fail because human perception quickly becomes accustomed to rhythmic patterns (the sensory habituation effect). The WERMA 444.110.75 solves this safety challenge by combining WERMA's patented EVS (Enhanced Vitality System) optical technology with a high-penetration 32-tone acoustic sounder, ensuring critical warning signals cannot be overlooked.

Model Number Configuration Breakdown (444.110.75):
- 444: Series 444 heavy-duty combined optical-acoustic signalling devices.
- 1: LED EVS optical light effect (stochastic random flickering pattern).
- 10: Integrated base and wall mounting configuration (BWM - Base/Wall Mount).
- 75: Red translucent optical dome with 24V AC/DC operating voltage.

Key Engineering Features & Operational Advantages:
- Patented Stochastic LED EVS Flickering Effect: Emits a randomized, irregular light pulse sequence specifically designed to emulate natural vital movements. Because the brain cannot predict or tune out the flickering frequency, the optical signal creates persistent subconscious awareness and triggers rapid operator response during hazardous events.
- Powerful 114 dB(A) Sounder with 32 Programmable Tones: Incorporates a high-output electronic sound transducer offering 32 distinct tone profiles conforming to international standards (including DIN fire alarm tones, sweeps, alternating frequencies, and continuous beeps). With sound pressure levels up to 114 dB(A) at 1 meter, the alarm easily cuts through heavy plant noise generated by presses, stamping machines, and compressors.
- 3 Remote Escalation Stages: Equipped with multi-channel digital control inputs allowing users to configure three distinct acoustic escalation levels via external PLC outputs (e.g., Stage 1: Intermittent warning; Stage 2: Continuous alarm; Stage 3: Maximum 114 dB siren paired with LED EVS strobe for immediate safety evacuation).
- 50,000-Hour Maintenance-Free LED Array: Solid-state LED construction delivers an expected operating lifespan exceeding 50,000 continuous hours without mechanical wear, filament burnouts, or Xenon tube replacements, significantly reducing maintenance overhead.
- IP65 Weatherproof Industrial Housing: The base is molded from robust, UV-stabilized black PC/ABS engineering thermoplastic, sealed with an impact-resistant polycarbonate red lens. With IP65 ingress protection against water jets and heavy particulate contamination, the unit operates reliably from -30°C to +50°C in indoor workshops and outdoor installations.

Typical Industrial Applications:
- Emergency machine fault and safety trip notification on automated packaging lines, stamping presses, and CNC manufacturing cells.
- Perimeter intrusion and cycle-start alerting for industrial robotic workcells and automated weld stations.
- Movement warnings for overhead gantry cranes, rail-guided transport carts, automated guided vehicles (AGV/AMR), and logistics sortation diverters.
- Chemical release, high-pressure, and over-temperature alarming in petrochemical plants, paint shops, and metallurgical facilities.

• Manufacturer: WERMA (WERMA Signaltechnik GmbH + Co. KG)
• Country of Origin: 100% Germany (Made in Germany)
• Product Series: Series 444 Combined Optical-Acoustic Signalling Devices
• Part Number / Article No.: 444.110.75 (44411075 / 444-110-75)
• Visual Light Effect: LED EVS (Enhanced Vitality System - Stochastic Random Flickering Light)
• Optical Lens Color: Red (RD)
• Housing Base Color: Black
• Lens Material: Clear/Red Polycarbonate (PC), high mechanical impact resistance
• Housing Enclosure Material: Polycarbonate / Acrylonitrile Butadiene Styrene (PC-ABS)
• LED Service Life: Minimum 50,000 continuous operational hours
• Acoustic Output & Tones:
  - Tone Variety: 32 internationally standardized signal tones
  - Signal Escalation: 3 externally controllable escalation tones via digital inputs
  - Maximum Sound Output: Up to 114 dB(A) @ 1 meter
• Operating Voltage: 24V AC/DC (50/60 Hz)
• Current Consumption: Approximately 260 mA nominal (Up to 450 mA peak during 114 dB + EVS activation)
• Electrical Connection: Screw-clamp terminal connections (accepts wire cross-sections up to 2.5 mm²)
• Cable Entry: Integrated self-sealing cable grommet / membrane gland (cable diameter 8 to 12 mm)
• Mounting Configuration: Base mounting or wall mounting (BWM configuration)
• Ingress Protection Rating: IP65 compliant with EN 60529 (dust-tight and protected against water jets)
• Environmental Pollution Degree: Degree 3
• Operating Ambient Temperature Range: -30°C to +50°C (-22°F to +122°F)
• Physical Dimensions: Dome diameter ø112 mm, overall height approx. 150 mm, base width 120 mm
• Net Instrument Weight: Approximately 390 g (0.86 lbs)
• Regulatory Conformity: CE marked, RoHS compliant, WEEE compliant, EMC directive compliant.