Image
  1. Home
  2. testo 340
0632 3340

testo 340 - Flue gas analyser for use in industry

testo 340
testo 340 application
testo 340 application
testo 340 application
testo 340
testo 340
testo 340
testo 340
testo 340
testo 340
Image
testo 340
The testo 340 flue gas analyser is a high-performance emissions monitoring tool designed for industrial applications. Equipped with an O₂ sensor, an integrated flow and pressure difference measurement feature, and a calibration protocol, it delivers precise and adaptable flue gas analysis. The ability to add up to four gas sensors makes it suitable for a variety of industrial environments, ensuring reliable performance in high gas concentration conditions.
  • Customisable Gas Sensors – Supports up to four configurable gas sensors for flexible and on-site replacements.
  • Comprehensive Measurement Capabilities – Measures O₂, CO, COlow, NO, NOlow, NO₂, and SO₂ for a wide range of applications.
  • Versatile Kit Configurations – Available in three different kit options to suit specific industrial needs.
  • Designed for Industrial Use – Built for robust and demanding industrial applications.
  • Seamless Data Management – Transfer and analyse measurement data easily on a PC or notebook.
The testo 340 flue gas analyser is a powerful and adaptable solution for industrial emissions monitoring. With a standard O₂ sensor and the flexibility to add up to four additional gas sensors (CO, NO, NOlow, NO₂, or SO₂), it offers a customisable approach to emissions measurement. This makes it an essential tool for professionals involved in installing, servicing, and inspecting combustion systems, energy production facilities, and industrial firing plants.

Designed for use in challenging field conditions, the testo 340 is compact, robust, and easy to use, making it ideal for both domestic and international service operations. Its extended measuring range activates automatically in high gas concentration environments, ensuring precise and uninterrupted measurements while minimising sensor stress for prolonged operational life.

To suit different industrial requirements, the testo 340 is available in three distinct kit configurations, allowing you to choose the ideal setup for your specific application. Measurement data can be easily transferred and analysed on a PC or notebook, simplifying reporting and compliance tracking.

For leasing options and additional accessories, contact us today.

Differential Pressure - Piezoresistive

Measuring range
-200 to 200 hPa
Accuracy
±1.5 % of mv (Remaining Range)
±0.5 hPa (-49.9 to 49.9 hPa)
Resolution
0.1 hPa

Absolute Pressure

Measuring range
+600 to +1150 hPa
Accuracy
±10 hPa
Resolution
1 hPa

Flue gas O₂

Measuring range
0 to 25 Vol.%
Accuracy
±0.2 Vol.%
Resolution
0.01 Vol.%
Reaction time t₉₀
< 20 s

testo 340 flue gas analyzer, calibration protocol, shoulder strap, O2 sensor and integrated flow and pressure difference measurements.

PLEASE NOTE: Your testo 340 must be fitted with a second gas sensor for it to work. Up to three additional sensors can be fitted.

Flue gas probes

Pitot tubes

Temperature probes

Analysis of the gas atmosphere (thermal processes)

Flue gas analysis is used for thermal manufacturing processes, from ongoing emission control, via setting and optimisation of combustion systems, through to process monitoring. Flue gas analysis instruments serve to optimise operations and save fuel. At the same time, flue gas measurement enables checking and monitoring of flue gas emission limit values laid down by the authorities, along with functional testing of permanently installed emission instruments. Flue gas analysis instruments are increasingly used for monitoring process and product quality.

Advantages of the testo 340

Ideal for measurements at high concentrations

  • When recording extremely high concentrations, the measuring range extension is automatically activated. This enables continuation of the measurement. The gas sensor is not subjected to any higher stress than it is at low gas concentrations. This ensures the sensor has the longest possible service life.

Service measurement on industrial engines

Flue gas analysis instruments are one of the items of equipment that are used on a daily basis by service engineers to achieve optimum tuning of engines. Flue gas measurement is used on industrial engines when they are commissioned, at regular maintenance intervals or for troubleshooting when they are running in an unstable way. The background to flue gas measurement is tuning the engine to the optimum operating parameters while complying with the limit value regulations in force. Maintenance work that is carried out regularly makes an important contribution to avoiding downtimes over the long term, to ensuring the quality of the system and thus a high level of efficiency and to having a significant influence on emission levels.

Advantages of the testo 340
Separate NO and NO2 measurement

  • The real NOx value is measured with the NO and NO2 sensor combination. In gas engines, the NO2 component of the NOx value can fluctuate greatly, so the separate measurement of each of the gases is necessary for correct NOx values.

Measurements even at high CO concentrations

  • At unexpectedly high concentrations (up to 50,000 ppm), the automatic dilution of the sensor with fresh air allows measurements even when the engine conditions are not defined, without negatively affecting the service life of the sensor.

Special flue gas probes for industrial engines as an accessory

  • These probes are highly heat-resistant and specially designed to compensate for different pressure conditions, e. g. for measurements before and after the catalytic converter.

Engine-specific parameters

  • The most important parameters for industrial engines such as O2, CO, NO, NO2, NOx and Lambda can be displayed simultaneously.

Service measurement on industrial burners

The testo 340 flue gas analysis instrument offers service engineers a vast range of technical functions. In addition to compliance with environmental regulations, it can also be used to check correct functioning and to optimise burner efficiency. Flue gas measurement is used on industrial burners for safe and efficient commissioning, at regular maintenance intervals or for troubleshooting when they are running in an unstable way.

Advantages of the testo 340
Time saving through helpful instrument pre-settings

  • Typical fuels, a sensible sequence of flue gas parameters in the display and useful instrument settings are preset for each application. Tips on the display take the user through the measurement (no prior knowledge specific to the instrument needed). The testo 340 is ready for operation within just a few minutes.

Unrestricted measuring at high concentrations

  • When commissioning burners or carrying out measurements on unfamiliar systems, very high concentrations can occur unexpectedly. The measuring range extension is automatically activated in such cases.

Always ready for use – even in tough day-to-day work

  • The robust housing protects the measuring instrument from knocks.

Contact Us
Testo Ltd
Newman Lane
GU34 2URAlton
HampshireUnited Kingdom
01420 544433

Opening hours

Monday-Thursday: 8:30am - 17:00pmFriday: 8:30am - 16:00pm
Image
Blog

Visit our blog

© 2026