Wöhler A 550 Flue Gas Analyzer | O₂ CO H₂ Combustion Analysis | Multi-Fuel HVAC Tester

Used. Excellent working condition.

The Wöhler A 550 is a high-end combustion and flue gas analyzer designed for professional HVAC technicians, chimney inspectors, and service engineers. Based on the provided images, this unit is configured for multi-fuel combustion analysis and supports testing of natural gas, LPG, oil, biodiesel, pellets, wood, and solid fuels.

The analyzer features a large color touchscreen with intuitive menus, allowing direct selection of fuel type and automatic calculation of combustion parameters according to relevant standards (e.g. UNI 10389-1, BImSchV). It is suitable for commissioning, periodic inspection, efficiency testing, and emissions control of heating systems.

The device is supplied with a stainless-steel flue gas probe and transport case, making it ideal for mobile field use.

Measured Gases – Confirmed from Display Analysis

Directly Measured Gases (Sensors):

• O₂ – Oxygen (%)

• CO – Carbon Monoxide (ppm)

• H₂ – Hydrogen (ppm)

⚠️ Important:
CO₂ is calculated, not measured directly (derived from O₂ and fuel type).

Calculated & Combustion Parameters:

• CO₂ – Carbon Dioxide (% calculated)

• η – Combustion efficiency

• λ – Excess air ratio

• qA / qS – Heat losses

• CO air-free / undiluted

• Flue gas temperature (Tg / Trg)

• Ambient temperature (Ta)

• Draft / differential pressure (Pa)

Fuel Types Visible on Device (from images):

• Gas naturale (Natural Gas)

• GPL (LPG)

• Gasolio (Diesel / Heating Oil)

• Olio comb. (Fuel Oil)

• Biodiesel

• Pellets

• Legna (Wood)

• Carbone / Coke / Solid fuels

• User-defined fuel profiles

Key Features:

• Professional combustion & flue gas analysis

• Multi-fuel support with automatic calculations

• High-resolution color touchscreen

• Integrated pump with probe connection

• Data logging, graphics, and report functions

• Designed for regulatory and service inspections

• Rugged housing for field operation

Typical Applications:

• Boiler commissioning & maintenance

• Gas, oil, pellet, and solid-fuel systems

• Chimney and flue inspections

• Emissions and efficiency verification

• HVAC service and regulatory checks