The Bühler GAS 222.35 Ex1 Explosion-Proof Heated Gas Sampling Probe with Integrated Blowback Valve is a premier industrial sample extraction unit engineered by Bühler Technologies GmbH (Germany). Certified to stringent international explosion protection standards (ATEX / IECEx Zone 1, Zone 21), this probe is designed for extreme operating conditions with heavy particulate loads and high process temperatures in hazardous locations such as petroleum refineries, petrochemical plants, natural gas processing facilities, industrial incinerators, and explosion-proof Continuous Emission Monitoring Systems (CEMS).

A key technical highlight of the GAS 222.35 Ex1 model is its Ex-certified pneumatic blowback valve integrated directly onto the probe head assembly. This enables automated, high-pressure backflushing of compressed air to clear accumulated dust from the internal filter element (Ceramic or SS316L stainless steel) without requiring complex external valve manifolds. Automated periodic blowback prevents filter blinding, maintains steady sample gas flow, and substantially lowers routine maintenance requirements in hazardous Ex zones.

Furthermore, the unit features an Ex-certified self-regulating electric heating element, maintaining a stable probe head temperature of up to 200°C (T4 rating). Continuous heating prevents moisture condensation, acid dew point drop, and line corrosion, preserving sample gas integrity prior to analyzer delivery. Paired with a tool-free, quick-release filter cover mechanism (Easy-Lock System), the Bühler GAS 222.35 Ex1 delivers continuous 24/7 reliability and minimal operational cost 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 Integrated Blowback Valve
• Model: GAS 222.35 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)
• Blowback Valve: Factory-integrated Ex-certified pneumatic blowback valve on probe head
• 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 automated backpurge system for online filter cleaning
• 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)