testo 330i – flue gas analyzer with NO sensor

  • On-site digital creation of reports with the testo 330i App
  • Operation independent of measuring location – readings are always available when you need
  • testoFix probe holder (optional) – holds the probe in the centre of flow at all times
  • Particularly robust, completely enclosed plastic housing


Proven technology meets revolutionary operation. The testo 330i flue gas analyzer was specifically developed to help you to overcome all the obstacles you meet when servicing and commissioning heating systems.



Product Description
The testo 330i flue gas analyzer is an advancement of the testo 330 LL flue gas analyzer. Its proven measuring technology is once again at the heart of the testo 330i. This means that you can rely on highly accurate results when measuring flue gas, draught and O2 supply air. The testo 330i also has the following impressive features:

  • User-replaceable long-life sensors with a service life of up to 6 years
  • Successful TÜV inspection according to the 1st German Federal Immission Control Ordinance (BImSchV) and EN 50379, Parts 1-3
  • ntegrated draught and gas zeroing. This means that the probe does not have to be removed from the flue gas duct for the zeroing
  • Fresh air dilution up to 30,000 ppm upon exceeding a CO threshold value
  • NO sensor for combined heat and power plants

The new testoFix probe holder is available as an accessory, so the flue gas probe is guaranteed not to lose the centre of flow once it has been found. This can be attached to the pipe quickly and easily. It holds the probe in the centre of flow and also serves as a fall-proof suspension system for the testo 330i flue gas analyzer. Incidentally, the hose between probe and measuring instrument is lighter and more flexible than before.

The future of flue gas measuring technology

The testo 330i no longer has a display. How do you make the correct adjustments to the flue gas analyzer? Where can you view the readings? What about the creation of measurement protocols? Via the testo 330i App on your smartphone. The readings are transferred from the testo 330i flue gas analyzer to the App via Bluetooth. So you always have the relevant values to hand whenever you need them. This is particularly useful when faced with larger systems or awkward measuring points as there is no need to look around corners, which can be annoying. The measurement parameters can also be set intuitively, via the App. Once you have completed the measurement, you can add comments or photos of the system to the results on site, and send them to your customer or the office via e-mail.

Requirement: iOS 7.1 / Android 4.3 or newer. Mobile end device with Bluetooth 4.0.

Delivery Scope

testo 330i flue gas analyzer with long-life gas sensors, 3 slots and integrated draught and gas zeroing, including O2/CO measuring cell, NO sensor, rechargeable battery and calibration protocol.  

Technical Data

General technical data
Weight 720 g (excluding battery)
Dimensions 270 x 160 x 57 mm
Operating temperature -5 to +45 °C
Power supply Rech. batt. block 3.7 V / 2.6 Ah; Mains unit 6 V / 1.2 A (optional)
System requirements requires iOS 7.1 or newer; requires Android 4.3 or newer; requires mobile end device with Bluetooth 4.0
Maximum memory 500000 readings
Storage temperature -20 to +50 °C
Differential Pressure – Piezoresistive
Measuring range 0 to 300 hPa
Accuracy ±0.5 hPa (0.0 to +50.0 hPa)

±1 % of mv (+50.1 to +100.0 hPa)

±1.5 % of mv (Remaining Range)

Resolution 0.1 hPa
Flue gas O₂
Measuring range 0 to 21 Vol.%
Accuracy ±0.2 Vol.%
Resolution 0.1 Vol.%
CO determination (without H₂-compensation), automatic dilution
Measuring range 0 to 15000 ppm
Accuracy ±200 ppm or ±20 % of mv (0 to 15000 ppm)
Resolution 1 ppm
Flue gas NO
Measuring range 0 to 3000 ppm
Accuracy ±5 ppm (0 to 100 ppm)

±5 % of mv (101 to 2000 ppm)

±10 % of mv (2001 to 3000 ppm)

Resolution 1 ppm
Differential Pressure flue gas Draught – Piezoresistive
Measuring range -9.99 to +40 hPa
Accuracy ±0.02 hPa or ±5 % of mv (-0.50 to +0.60 hPa)

±0.03 hPa (+0.61 to +3.00 hPa)

±1.5 % of mv (+3.01 to +40.00 hPa)

Resolution 0.01 hPa
Measuring range -40 to +1200 °C
Accuracy ±0.5 °C (0.0 to +100.0 °C)

±0.5 % of mv (Remaining Range)

Resolution 0.1 °C (-40 to +999.9 °C)

1 °C (Remaining Range)

dependent on the thermocouple

Flue gas degree of effectivity, Eta (calculated)
Measuring range 0 to 120 %
Resolution 0.1 %
Flue gas loss (calculated)
Measuring range 0 to 99.9 %
Resolution 0.1 %
Flue gas CO₂ calculation (calculated from O₂)
Measuring range Display range 0 to CO₂ max
Accuracy ±0.2 Vol.%
Resolution 0.1 Vol.%
Flue gas CO (without H₂-compensation)
Measuring range 0 to 4000 ppm
Accuracy ±20 or ±10 % of mv (0 to 400 )

±5 % of mv (401 to 2000 ppm)

±10 % of mv (2001 to 4000 ppm)

Resolution 1 ppm


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