MTL24571 Signal Isolator Module Industrial Control High Precision Noise-Free DIN Rail

1. Intrinsic Safety Barrier Solution​

The Honeywell MTL24571 is a galvanically isolated intrinsic safety (IS) barrier engineered for hazardous area signal conditioning in Zone 0/20 explosive atmospheres. Featuring ​Ex ia IIC T4 certification, this device provides ​250V AC/DC isolation​ between safe and hazardous areas while supporting ​4-20mA analog signals​ with ​​≤0.01% linearity error. Its ​robust epoxy-potted enclosure​ offers ​IP20 protection​ and withstands ​​-40°C to +80°C​ operating temperatures. The barrier incorporates ​fault-tolerant Zener diode technology​ with ​current limiting ≤93mA​ and ​voltage clamping ≤30V DC​ to prevent ignition-capable energy transmission. Certified for ​ATEX/IECEx/FM/CSA, it enables SIL 2 safety loop compliance (IEC 61508) with ​galvanic separation​ up to ​1500V AC. Designed for transmitters, solenoid valves, and sensors in oil/gas, chemical, and pharmaceutical industries, this barrier ensures safe signal transmission in explosive gas/dust environments without requiring external isolators.

​2. Critical Technical Specifications​

Key parameters include ​2-wire loop support​ with ​24V DC supply​ (18-30V range), ​100Ω maximum loop resistance, and ​1.5W power dissipation. The barrier achieves ​​±0.05% accuracy​ at 20mA with ​​<10ppm/°C thermal drift. Electrical isolation ratings include ​1500V AC test voltage​ (input-output) and ​500V AC​ (input-ground). Connection utilizes ​screw terminals​ (0.5-2.5mm²) with ​color-coded channels​ (blue=safe, yellow=hazardous). Certifications cover ​ATEX Ex ia IIC T4 Ga, ​IECEx Ex ia IIC T4 Gb, ​FM/CSA Cl I Div 1, and ​SIL 2​ (PFHD 1×10⁻⁸/h). Dimensions are ​22.5×110×115mm​ (W×H×D) with ​DIN-rail mounting​ (EN 60715). Environmental compliance includes ​EN 60068-2 vibration resistance​ (15g) and ​IEC 60079-0 impact protection​ (7J).

​3. Hazardous Area Applications​

This barrier excels in explosive environment scenarios:

• ​Oil & Gas Wellheads: Pressure transmitter isolation in Zone 0
• ​Chemical Reactors: Temperature sensor protection (Zone 1/21)
• ​Pharmaceutical: Solenoid valve control in solvent zones (Zone 1)
• ​Grain Silos: Level sensor safety in combustible dust (Zone 20)
• ​Paint Spray Booths: VOC concentration monitoring
• ​Methane Detection: Gas sensor circuits in coal mines
• ​Tank Farms: Overfill prevention system isolation
• ​Hydrogen Fueling: Leak detection in refueling stations
  Its Ex ia IIC T4 certification allows installation in hydrogen environments (Group IIC), while the SIL 2 rating supports safety instrumented functions (SIF) for applications like emergency depressurization systems. The epoxy encapsulation resists corrosive chemicals in offshore installations and maintains performance during thermal cycling from -40°C to +80°C.

​4. Functional Safety Advantages​

• ​Explosion Protection:
  Triple-redundant Zener barriers with current/voltage clamping
  <30V/93mA output limits prevent ignition energy
• ​Signal Integrity:
  ±0.05% accuracy with EMI immunity >150dB
  Galvanic isolation eliminates ground loops
• ​Diagnostic Capability:
  Visual LED status (green=power, red=fault)
  Loop resistance monitoring via test points
• ​Installation Efficiency:
  Tool-less DIN-rail clip (EN 60715)
  Terminal markings per IEC 60947-7
• ​Compliance Coverage:
  Global certifications (ATEX/IECEx/FM/CSA)
  SIL 2 hardware fault tolerance
• ​Lifecycle Durability:
  20-year service life
  Hermetic epoxy seal prevents moisture ingress

​5. Safety Operation & Integration​

​Protection Mechanism:

1. ​Voltage Clamping:
   Zener diodes limit hazardous-side voltage ≤30V DC
2. ​Current Limiting:
   Resistor-fuse network caps current ≤93mA
3. ​Isolation Barrier:
   Transformer separation withstands 1500V AC

​Diagnostic & Maintenance:

• Annual loop resistance verification (≤100Ω)
• 5-year dielectric strength test (1500V AC)
• SIL verification via Honeywell Safety Manager Suite

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.

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