RH1512-027 - Magnetoelectric Speed Sensor - 12V DC IP67 Stainless Industrial Probe

1. Intrinsically Safe Speed Monitoring Solution​

The AI-Tek RH1512-027 is an explosion-proof speed sensor engineered for critical rotational monitoring in hazardous industrial environments. Featuring a ​magnetic sensing principle​ with ​2mm sensing distance, this device generates digital pulses proportional to gear teeth or notch passage with ​​±0.1% accuracy. Its ​stainless steel housing (316L)​​ achieves ​ATEX/IECEx Zone 0/1 certification​ and ​IP68 protection​ against dust, moisture, and temporary submersion (1m depth). The "027" suffix denotes ​NAMUR-compliant output​ (IEC 60947-5-6) for direct integration with safety systems. Operating across ​​-40°C to +100°C, it incorporates ​hermetic sealing​ to prevent gas ingress in explosive atmospheres. Designed for turbines, compressors, and conveyors in oil/gas, mining, and chemical processing, this sensor provides reliable speed feedback where combustible gases/dusts demand rigorous safety standards with SIL 2 compliance per IEC 61508.

​2. Critical Technical Specifications​

• ​Sensing Performance:
  Target: Ferrous gear teeth (≥2mm module)
  Sensing Distance: 2mm ±0.2mm
  Frequency Range: 0–10kHz
  Accuracy: ±0.1% of reading
• ​Electrical:
  Voltage: 8-30V DC (loop-powered)
  Output: NAMUR (2-4mA current loop)
  Compliance: IEC 60947-5-6
• ​Environmental:
  IP68 (IEC 60529)
  Temperature: -40°C to +100°C
  Shock Resistance: 100g (IEC 60068-2-27)
• ​Hazardous Area:
  ATEX Ex ia IIC T4 Ga
  IECEx Ex ia IIC T4 Ga
• ​Mechanical:
  Housing: SS316L (EN 1.4404)
  Cable: PUR 2m (oil-resistant)
  Mounting: M18×1.5 threaded

​3. Hazardous Environment Applications​

This sensor serves critical speed monitoring roles:

• ​Offshore Gas Compressors: Shaft speed monitoring in methane-rich Zone 1 areas
• ​Coal Processing Plants: Conveyor speed verification in combustible dust (Zone 21)
• ​Refinery Turbines: Overspeed protection per API 670 standards
• ​Chemical Reactors: Agitator speed control in H₂S environments (Zone 0)
• ​Grain Handling Facilities: Elevator speed interlocks in ATEX Zone 22
• ​Marine Propulsion Systems: Propeller shaft RPM monitoring
• ​Petroleum Transfer Pumps: Safety cutoffs in flammable vapor zones
• ​Explosives Manufacturing: Mixer speed verification
  Its 2mm sensing distance enables precise detection of small gear teeth common in turbine gearboxes, while IP68 rating ensures reliability in washdown areas and temporary submersion scenarios common in offshore platforms.

​4. Functional Advantages​

• ​Hazardous Area Safety:
  Intrinsic safety barriers limit energy to <0.03W
  Hermetic seals prevent explosive gas permeation
• ​Signal Reliability:
  NAMUR output enables broken wire detection (<1.2mA/>6.5mA)
  ±1μs pulse timing accuracy
• ​Environmental Durability:
  Resists oils, solvents, and UV degradation (UL 94 V-0)
  500hr salt spray resistance (ISO 9227)
• ​Diagnostic Intelligence:
  Dual-color LED indicates power/signal status
  Short-circuit/overload protection
• ​Installation Flexibility:
  360° adjustable sensing head
  ±1mm lateral tolerance alignment
• ​Compliance Efficiency:
  SIL 2 capable per IEC 61508
  Pre-certified IECEx/ATEX documentation

​5. Speed Sensing Operation​

​Magnetic Sensing Sequence:

1. ​Target Detection:
   • Gear tooth approaches within 2mm → magnetic flux change
2. ​Signal Generation:
   • Hall-effect sensor triggers Schmitt-trigger circuit
   • Pulse width: 50% duty cycle ±5%
3. ​NAMUR Output:
   • Current swing: 2mA (no target) → 4mA (target detected)
   • Open-circuit detection: <1.2mA or >6.5mA
4. ​Fault Diagnostics:

   ​LED State​	​Condition​
   Solid Green	Power applied
   Flashing Green	Signal detected
   Solid Red	Fault condition
   Flashing Red	Configuration error

​Safety Architecture:

• Galvanic isolation >1.5kV AC
• Output current limited to <8mA
• Automatic shutdown on short circuit

Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.

With many years of experience in the industrial sector, we consistently deliver the highest quality of spare parts.which make sure that all this jobs are

perfectly.

we are major in PLC,Sensors,HIM,Transmitters.

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