Testo 320B - Flue Gas Analyser

Award Winning Testo 320B Flue Gas Analyser. Quickly determine and eliminate malfunctions, monitor legal limit values and perform spot checks.
Manufacturer: Testo


Picture of Testo 320B - Flue Gas Analyser (standard kit)
Testo 320B - Flue Gas Analyser (standard kit)
Includes: Case, USB Charger and Flue gas probe 180mm/300mm P-Type D=6mm.
Part number: 0563 3223 71
£679.00 (ex VAT)
Picture of Testo 320B - Flue Gas Analyser (advanced kit)
Testo 320B - Flue Gas Analyser (advanced kit)
Includes: Case, USB Charger, Flue Gas probe 180mm/300mm P-Type D=6mm, IRDA printer, Hose connection set, temp set and Spare particle filters.
Part number: 0563 3223 72
£799.00 (ex VAT)


Designed specifically for UK heating engineers

Designed specifically for the UK heating engineer, the 320B Flue gas analyser has a colour graphic display providing a unique user interface experience to access measurement menus for: Flue gas Analysis, Draught Measurement, pressure, Ambient CO Measurement, Letby & Tightness testing.

It’s also compatible with all the accessories supplied with Testo 327 analysers, so if you are upgrading you won’t need to replace these.


Testo 320B Flue Gas Analyser - Top Product 2013 Award winner from PHPI Magazine


Features and advantages of the 320B include:

  • Updated colour screen for clearer readings
  • New robust design and sleek look
  • Works with all existing testo 327 accessories including printer, temperature and pressure kits
  • Designed specifically for UK heating engineers
  • Access to 320B ‘How to’ videos which offer a step by step guide and help you get the very best out of your analyser
  • Fixed price servicing available with all new analysers
  • Built in Memory - Up to 20 readings with USB transfer to PC.
  • Independently Tested to EN50379 - Meets requirements of BS7967.
  • For use with all common fuel types
  • 3 Year Warranty*
  • Li-ion USB Rechargeable Battery
  • Automatic CO sensor protection shuts off pump

* 3 year warranty is on Instrument, probes and gas sensors but doesn’t cover rechargeable battery. Battery has a separate 12 month warranty.


The 320B is the perfect analyser for all domestic applications


New & Improved Range

The new range benefits from improved robustness to deal with the rigours of the UK energy market. The high quality sampling probes with non-kinking PTFE coated hose and unique connector are recognisable marques of Testo quality. The range now benefits from further enhancements to the measurement systems leading to increased robustness, even in aggressive flue gas environments and tests have indicated the gas sensors benefit from a longer life, and exhibit higher sensitivity.

The 320B also has a built-in memory, li-ion rechargeable batteries, printer and supports the full range of fuels including natural gas, butane, propane, light oil, kerosene, heavy oil, wood pellets, coal, anthracite and coke, all within a robust and easy to use housing.

Testo 320B Advanced Kits are available for just £720, including analyser, hard case, temperature kit, pressure kit, printer and spare filters.


Technical Data and Specification


Storage temp. -20 to +50 °C
Oper. temp. -5 to +45 °C
Power supply Rech. batt.: 3.7 V / 2400 mAh
Mains unit: 6 V/1.2 A
Memory 20 readings
Display Colour graphic display with 240 x 320 Pixel
Weight 573 g
Dimensions L 240 x W 85 x H 65 mm
Warranty Instrument/probes/gas sensors:
24 months
Rech. batt.: 12 months


  Measuring range Accuracy ±1 Digit Resolution Adjustment time t90
Temperature -40 to +1200 °C Accuracy: ±0,5°C (0 to 100°C)
Accuracy: ±0.5% of m.v. remaining range
0.1 °C -40 to +999,9°C
1 °C; from +1000°C:
Draught measurement -9.99 mBar to
+40.00 mBar
± 0.02 hPa or
± 5% of m.v. (at -0,50 to +0,60 hPa)
± 0.03 hPa (0.61 to 3.00 hPa)
± 1.5% of m.v. (at 3.01 to 40.00 hPa))
0.01 mBar
with fine draught option
0.001 mBar
Pressure measurement 0 to +300 mBar ±0.5 hPa (0.0 to +500 hPa)
± 1 % of m.v. (at 50.1 to 100.0 hPa)
± 1,5 % of m.v. (at 100,1 to 300,0 hPa)
0.1 mBar with fine pressure
option 0.01
O2measurement 0 to 21 vol.% ± 0.2 vol.% 01 vol. % < 20 sec
CO measurement
0 to 4000 ppm ±3 ppm (0 to 30 ppm)
±10 % of M.V. (31 to 200 ppm)
±20 ppm (201 - 400 ppm)
±5 % of M.V. (401 to 2000 ppm)
±10 % of M.V. (2001 to 4000 ppm)
1 ppm < 60 sec
Efficiency testing
(Gross and Net)
0to120 % - 01 % -
CO2 determination
digital calculation from O2
0 to CO2 max ± 0.2 vol.% 01 % -


Service and Calibration

For calibration of this instrument, please call us on 01420 544 433 and quote the below Service and Part Number: