The Bühler GAS 222.31 Ex1 Explosion-Proof Heated Gas Sampling Probe with Shut-Off Valve is a top-tier industrial sample extraction unit engineered by Bühler Technologies GmbH (Germany). Certified to stringent explosion protection standards (ATEX / IECEx Zone 1, Zone 21), this probe is designed specifically for extreme operating environments with heavy particulate loads and high process temperatures in hazardous locations such as petroleum refineries, petrochemical plants, gas processing facilities, industrial incinerators, and explosion-proof Continuous Emission Monitoring Systems (CEMS).

A key feature of the GAS 222.31 Ex1 model is the dual integration of an Ex-certified, tool-free quick-release filter cover mechanism (Easy-Lock System) and a built-in shut-off valve located directly at the probe head. The shut-off valve enables operators to safely isolate the sampling system from the hot process gas stream during routine filter element replacements, maintenance, or blowback operations. This shut-off capability guarantees maximum safety for personnel and prevents hazardous or toxic process 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, acid dew point drop, and fine dust adhesion on the filter element, preserving sample gas integrity prior to analyzer delivery. Paired with an automated pneumatic blowback system for internal Ceramic/SS316L filter cleaning, the Bühler GAS 222.31 Ex1 ensures uninterrupted 24/7 continuous extraction performance in demanding environments.

• Manufacturer: Bühler Technologies GmbH
• Country of Origin: Germany
• Product Series: Explosion-Proof Heated Gas Sampling Probe Series for High Dust Loads with Shut-Off Valve
• Model: GAS 222.31 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 Inlet Sample Gas Temperature: Up to 600°C (1112°F) (Depending on optional sampling tube selection)
• Isolation Valve: Integrated shut-off valve for safe process gas line isolation during maintenance
• Filter Replacement Mechanism: Tool-free Ex-certified Easy-Lock quick-release cover
• 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)