The Bühler GAS 222.21 Ex1 Explosion-Proof Heated Gas Sampling Probe with Shut-Off Valve is a premier industrial sample extraction system developed by Bühler Technologies GmbH (Germany). Engineered in full compliance with stringent international explosion protection standards (ATEX / IECEx Zone 1, Zone 21), this probe is ideal for Continuous Emission Monitoring Systems (CEMS) and process gas analysis across oil refineries, natural gas processing facilities, chemical plants, and hazardous industrial sites.

A key highlight of the GAS 222.21 Ex1 model is its integrated shut-off valve located directly at the probe head. This enables operators to safely isolate the sampling system from the hot process gas stream during routine filter element replacements, maintenance, or pneumatic blowback operations. This shut-off capability guarantees maximum safety for personnel and prevents hazardous or toxic gases from escaping into the environment.

Furthermore, the unit features an Ex-certified self-regulating electric heating element, maintaining a stable probe head temperature of up to 200°C (T4 temperature class). Continuous heating prevents moisture condensation and acid dew point precipitation within the sample line, ensuring sample gas integrity prior to analyzer delivery. Paired with an automated pneumatic blowback system for internal Ceramic/SS316L filter cleaning, the Bühler GAS 222.21 Ex1 ensures uninterrupted 24/7 continuous monitoring and long-term durability in extreme environments.

• Manufacturer: Bühler Technologies GmbH
• Country of Origin: Germany
• Product Series: Explosion-Proof Heated Gas Sampling Probe Series with Shut-Off Valve
• Model: GAS 222.21 Ex1
• Explosion Protection Rating: ATEX / IECEx Zone 1 (Ex II 2G Ex db eb mb IIC T4 Gb / Zone 21)
• Heating Temperature: Self-regulating up to 200°C max (Temperature Class T4)
• Maximum Sample Gas Temperature: Up to 600°C (Depending on optional sampling tube selection)
• Isolation Valve: Integrated shut-off valve for safe process gas line isolation during maintenance
• Maximum Operating Pressure: 6 bar (87 psi)
• Ambient Temperature Range: -20°C to +60°C
• Wetted Materials: Stainless Steel 1.4571 (SS316Ti), Ceramic, FKM
• Internal Filter Element: Ceramic or SS316L Stainless Steel, standard pore sizes 2 µm / 5 µm
• Blowback Mechanism: Integrated Ex-certified pneumatic backpurge valve for automated filter purging
• Test Gas Connection: Integrated calibration port for system integrity validation
• Mounting Flange: DN65 PN6 or ANSI 3" 150 lbs
• Power Supply: 115V AC or 230V AC, 50/60 Hz
• Ingress Protection Rating: IP65 (Outdoor weather-proof construction)