Testo 340 Industrial Flue Gas Analyser

Testo 340 Overview

The Testo 340 flue gas analyser is a high-end tool designed for professionals to measure, analyse and optimise combustion processes across industrial, commercial and residential applications. Equipped with advanced sensors and features, it provides accurate and reliable data on flue gas emissions from boilers, furnaces and other combustion systems.

The testo 340 comes pre-equipped with an O₂ sensor and can be fitted with up to three additional sensors, chosen from CO, CO low, NO, NO low, NO₂ or SO₂, so you can tailor the analyser to your specific needs. Automatic fresh-air dilution allows unrestricted measurement even at high gas concentrations, and integrated pressure-difference and air-flow measurement supports mass-flow calculations. Its small shape and dependable technology make it ideal for worldwide service operations and for installing or checking fire plants and energy-production systems.

Who the Testo 340 is for

The Testo 340 suits commissioning and service engineers who check emissions on industrial burners, process heaters, stationary engines and gas turbines, and plant teams who need spot readings between formal stack tests. It is a portable, battery-powered analyser, so it can be carried up to a sampling port. Each sensor is chosen at order time, so the instrument matches the gases you have to report.

Gas ranges and accuracy from the testo 340 data sheet:

• O₂ 0 to 25 vol.%, ±0.2 vol.%, t90 under 20 s (fitted as standard)
• CO, H₂-compensated, 0 to 10,000 ppm: ±10 ppm or ±10% up to 200 ppm, ±20 ppm or ±5% up to 2,000 ppm, ±10% of reading from 2,001 to 10,000 ppm
• COlow 0 to 500 ppm and NOlow 0 to 300 ppm, both with 0.1 ppm resolution for low-emission burners
• NO 0 to 4,000 ppm, NO₂ 0 to 500 ppm, SO₂ 0 to 5,000 ppm
• Draught -40 to +40 hPa (±0.03 hPa near zero), differential pressure ±200 hPa and absolute pressure 600 to 1,150 hPa

How the measuring range extension works:

• Single-slot dilution (factor 5) extends one sensor, for example CO up to 50,000 ppm or SO₂ up to 25,000 ppm
• Dilution of all sensors (factor 2) extends every channel at once, for example NO up to 8,000 ppm
• Testo states an extra error of ±10% of reading on the diluted gas channels (O₂: ±1 vol.% below 5 vol.%, ±0.5 vol.% from 5 to 25 vol.%)

For heating systems the Testo 330i is the lighter choice, and for multi-gas emission work with a separate analysis box there is the Testo 350 control unit. Flow can be measured with the Testo 0635 2145 Pitot tube, and readings can be printed on the testo fast printer IrDA. Compare other gas analysers or the Testo brand page.

Testo 340 Key Features

Why emission engineers pick the Testo 340:

• Portable industrial analyser with O₂ plus up to three selectable gas sensors
• Choice of CO, CO low, NO, NO low, NO₂ or SO₂ sensors
• Automatic fresh-air dilution for measurement at high concentrations
• Flue gas temperature from -40 to +1,200 °C with a Type K probe
• Integrated differential/absolute pressure and air-flow measurement
• Compact, rugged design for worldwide service work
• Fast, reliable results for combustion tuning and emissions checks

Testo 340 Applications

Plants and tasks the Testo 340 is built for:

• Industrial and commercial combustion and emissions measurement
• Boiler, furnace and burner tuning and optimisation
• Installation and checking of fire plants and energy-production systems
• Mass-flow calculations via pressure and air-flow measurement

What comes with the Testo 340 (0632 3340)

Supplied with the Testo 340 base unit:

• testo 340 flue gas analyser (with O₂ sensor)
• Rechargeable battery and carrying strap (testo lists the 100–240 V mains unit 0554 1096 as an accessory)
• The extra gas sensors you order; at least one is needed besides O₂
• Calibration protocol

Testo 340 FAQ

Common Testo 340 questions:

• Can the Testo 340 work with only the O₂ sensor? No. Testo states the analyser must have a second gas sensor to function, and up to three can be added to the O₂ cell.
• Can I use its Bluetooth in the UAE? Bluetooth is an option. The testo data sheet lists the countries where the radio module is permitted, and the UAE is not on that list, so plan on the USB cable with easyEmission software or the IrDA printer.
• Which probe do I need for a hot stack? Testo lists industrial probe sets for flue gas up to +1,200 °C (0600 7610) and +1,800 °C (0600 7620), plus a heated probe set (0600 7630) for humid gas.
• How long can it measure NO₂ or SO₂ continuously? Testo advises not to exceed about 2 hours for NO₂ and SO₂ readings, to avoid absorption in the gas path.

Why buy the Testo 340 from MME

Tell MME the fuel, the plant (boiler, burner, engine or turbine) and which gases you need to report. We will suggest a sensor set and probe for the testo 340 and then quote. Download the testo 340 datasheet (PDF)PDF