The S01749/A/VQ21 refers to a Crowcon Flamgard-Plus 96HD/FL Flammable Gas Detector (Spare) fitted with a 300P Pellistor sensor, which is a replacement for the older VQ21 sensor.

Product Overview

• Model: Crowcon Flamgard-Plus 96HD/FL
• Part Number: S01749/A
• Sensor Type: 300P Pellistor (replaces VQ21)
• Function: Detects flammable gases using catalytic bead technology
• Application: Fixed gas detection systems in industrial environments
• Compatibility: Designed for use with Crowcon Flamgard Plus systems

Technical Highlights

• Detection Principle: Catalytic combustion (pellistor)
• Target Gases: Hydrocarbons, hydrogen, aviation fuel vapors, leaded petrol vapors
• Output Signal: 4–20 mA current loop
• Housing: Marine-grade aluminum with stainless steel sensor head
• Ingress Protection: IP65