Dräger Polytron SE Ex

Reliable Stationary Sensing for Flammable Gases and Vapors

The Dräger Polytron SE Ex is a heavy-duty, explosion-proof gas detection sensing head designed for the continuous measurement of combustible gases and vapors in ambient air. Functioning as a high-performance catalytic bead sensor (pellistor), this sensor head detects flammable gas concentrations well before they reach the Lower Explosive Limit (LEL). It is designed to be paired with an external control unit or transmitter, providing an essential frontline defense for facility infrastructure and industrial personnel safety.

Poison-Resistant Sensor Technology and Long-Term Stability

The core of the Polytron SE Ex relies on proven pellistor technology optimized for long-term stability and resistance against typical sensor poisons such as silicones, sulfur compounds, and halogenated hydrocarbons. The sensor configuration utilizes a pellistor pair (a measuring element and a compensating element) to automatically cancel out variations caused by ambient temperature, humidity, and atmospheric pressure. This pellet arrangement ensures highly precise, drift-free analog resistance changes that accurately represent explosive gas levels.

Rugged Industrial Construction for Hazardous Environments

Built to endure the harshest operational environments, the Polytron SE Ex housing is constructed from robust, corrosion-resistant materials and features an explosion-proof design. The sensor enclosure provides comprehensive protection against dust and water ingress, ensuring reliable performance in open-air industrial plants, coastal zones, and high-vibration machinery rooms. Standardized metric entry threads allow the sensing head to be mounted directly to flameproof junction boxes or integrated smoothly into custom plant monitoring layouts.

Industrial Applications and Use Cases

• Oil & Gas Facilities: Monitoring upstream wellheads, offshore rigs, and downstream petroleum storage tank farms.

• Chemical and Petrochemical Plants: Tracking volatile chemical vapors near process pumps, valves, and storage tanks.

• Automotive Paint Booths: Ensuring solvent vapor concentrations remain safe during high-volume spraying operations.

• Gas Storage Warehouses: Continuous perimeter safety surveillance around liquefied petroleum gas (LPG) or compressed natural gas (CNG) cylinders.