Diffusion Type Gas Detector DA-500

DA-500: Advanced Gas Detector

In the realm of industrial safety, the DA-500 stands as a vigilant protector. It tirelessly detects a spectrum of combustible and toxic gases, ensuring the safety of gas producers, users, reservoirs, and by-producers. This advanced system converts digital signals into a 4-20mA standard current output, enabling seamless integration with PLCs, DDCs, and recorders, establishing a comprehensive gas monitoring network.

Key Features:

  • Proactive Safety: Prevent accidents by detecting gas leaks in advance.
  • Advanced Signal Conversion: Digital signals are effortlessly transformed into 4-20mA standard current output.
  • Comprehensive Monitoring: Build an all-encompassing gas monitoring system.
  • Extended Signal Reach: DC 4-20mA output spans a remarkable 2500 meters, and RS-485 communication signals transmit up to 1000 meters.
  • Real-time Alerts: Stay informed with RS-485 communication signals and alarm relay contacts.

Choose the DA-500 for safety that doesn't compromise. Your peace of mind is our priority.


  • Digital Precision: Our gas detector operates on a digital processor, featuring built-in artificial intelligence functions for precise and convenient gas monitoring.
  • Self-Diagnosis: The digital processor automatically checks sensor signals and promptly issues a 2mA error signal in case of sensor malfunction.
  • Calibration Simplified: Achieve hassle-free calibration without opening the front cover. A touch with a magnetic bar through the cover window is all it takes, ideal for corrective work even in explosive environments.
  • Illuminated Display: A user-friendly LCD display with backlight provides real-time gas density readings, ensuring clarity even in low-light areas.
  • Customized Programming: Tailor your calibration density and detection range with user programming, allowing personalized operating functions.
  • High-Resolution Accuracy: A built-in High Dissolution (HD) A/D converter guarantees precise output signals.
  • Versatile Output: Enjoy various output options including DC 4-20mA, two-step relay contacts, and optional RS-485 for seamless integration with a variety of devices and equipment.
  • Stable Transmission: The 4-20mA transmitter enables stable and long-distance signal transmission, reaching up to 2.5 kilometers.
  • Effortless Communication: RS-485 facilitates stable and long-distance signal communication, extending up to 1.2 kilometers.
  • Alarm Ready: Two-step relay contacts (AL1/AL2) provide reliable alarm outputs for heightened safety.
  • Elevate your gas monitoring with the DA-500's advanced features, ensuring safety without compromise. Your safety is our priority.

Technical Properties:

  • Detection Principle: NDIR (Nondispersive Infrared)
  • Gas Sampling: Diffusion Type
  • Target Gas: Combustible Gas, Toxic Gas
  • Measurement Range: %LEL, PPM, %vol
  • Response Time: Within 30 seconds, 90% of full scale
  • Accuracy: ≤±2% of Full Scale
  • Sensor Displacement: Zero - ≤±1%LEL every 6 months, Span - ≤±1%LEL every 6 months
  • User Programmable: Calibration Density, Detection Range
  • Input Power: DC 20~30V
  • Output Power: 4~20mA/Full Scale - 2.5km Transmission
  • Operating Temperature & Humidity: -30℃60℃, 595% RH (Non-Condensing)
  • Signal Cable: CVVS & CVVSB 1.5sq x 3 Wire - Shield Type
  • Wire Conduit: 1/2” or 3/4” PF, NPT
  • Installation Type: Wall or Pipe Station
  • Exterior Material: Cast Aluminum Alloy
  • Explosion-Proof: Ex d IIC T5 - Korea Gas Safety Corporation
  • Output: 2-Step Relay Contact (High/Low)
  • Communication Output: RS-485 Communication Output (optional)