The Bühler Technologies GAS 222.20-DH Heated Gas Sampling Probe is a specialized extraction device engineered for demanding high-dust, high-moisture gas streams by Bühler Technologies (Germany). Built upon the rugged GAS 222.20 high-dust probe architecture, the GAS 222.20-DH integrates a direct/downstream electric heating system to solve sample extraction challenges in environments containing heavy particulate loads combined with corrosive, condensable gases.

A key engineering advantage of the Bühler GAS 222.20-DH is the combination of an expanded filter chamber with integrated thermal heating. Maintaining an elevated probe body temperature up to 200°C prevents sample gas cooling below the acid dew point during filtration. This eliminates moisture condensation on the filter element, preventing dust caking and protecting downstream sample lines and gas analyzers from corrosive damage.

Operationally, the probe features a spacious filter housing with a tool-free quick-release clamp, allowing maintenance technicians to inspect or swap out filter elements swiftly. It also features an integrated backpurge (blowback) port, enabling automated high-pressure compressed air cycles to blow off dust accumulation from the external filter surface periodically.

Manufactured 100% in Germany from heavy-duty corrosion and abrasion-resistant materials such as stainless steel 1.4571 (SS316Ti), Hastelloy, or PTFE coatings, the Bühler Technologies GAS 222.20-DH is the premier sampling probe choice for Continuous Emission Monitoring Systems (CEMS) operating in coal power stations, cement kilns, metallurgical smelters, and industrial waste incineration plants.

• Manufacturer: Bühler Technologies
• Origin: Germany
• Product Series: GAS 222 Series
• Model: GAS 222.20-DH
• Key Feature: Electrically Heated Gas Sampling Probe for High Dust Applications
• Heating System: Integrated direct / downstream electrical heating
• Probe Body Temperature: Maintained up to 200°C max (prevents acid dew point condensation)
• Heating Power Supply: 115V / 230V AC, 50/60 Hz
• Filter Mechanism: Large surface filter element with tool-free quick-release clamp
• Filter Element Options: Ceramic / PTFE / Stainless Steel Mesh (1 µm to 10 µm porosity)
• Wetted Materials: Stainless Steel 1.4571 (SS316Ti) / Hastelloy / PTFE
• Sample Gas Process Temperature: Up to 600°C / 1000°C / 1400°C (depending on sampling tube selection)
• Max Operating Pressure: Up to 6 bar
• Flange Connection: DN65 PN6 / ANSI 3" 150 lbs (or custom flange configurations)
• Sample Gas Outlet Connection: Female thread G 1/4" or NPT 1/4"
• Backpurge Feature: Integrated compressed air blowback connection
• Ingress Protection Rating: IP55 / IP65