testo 300 Longlife - flue gas analyzer (O2, CO up to 4,000 ppm, NO)

Order-Nr.  0633 3004 74

  • Intuitivni mjerni izbornici i brz odziv pametnog zaslona osjetljivog na dodir osiguravaju jednostavan rad – kao na vašem pametnom telefonu

  • Uključujući O2, CO senzor do 4,000 čestica u minuti i NO senzor

  • Visokokvalitetna tehnologija senzora s radnim vijekom do 6 godina

  • Izrada dokumentacije na licu mjesta i slanje izvješća e-poštom

The testo 300 flue gas analyzer with Longlife sensors is ideal for heating engineers who carry out installation and maintenance work on heating systems several times a day. It combines decades of experience in measuring technology with contemporary Smart-Touch operation, robust construction and e-mailing of reports. The testo 300 enables easy measurement of flue gas, draught, pressure, ambient CO and differential temperature.


Product Description

Truly smart flue gas measurement on heating systems with the testo 300 flue gas analyzer. High-quality sensors, intuitive operation with Smart-Touch technology and smart features, such as efficient documentation and e-mailing of reports, will make your day-to-day work easier.

testo 300 Longlife flue gas analyzer with Smart-Touch operation – Features

Impressive measuring technology and quality

  • O2, CO sensor up to 4,000 ppm and NO sensor
  • Longer sensor service life thanks to automatic sensor protection
  • For intensive daily use: high-quality Longlife sensors for O2 and CO with a service life of up to 6 years. That means at least one sensor replacement is saved in the course of a normal working life
  • TÜV-tested according to first German Federal Immission Control Ordinance (BImSchV) and EN 50379, Parts 1-3
  • Integrated fine pressure
  • Manufacturer's warranty of up to 5 years on O2 and CO sensor with product registration – without a maintenance contract
  • Versatile probes and fast probe changes: take advantage of quick-change probes and the multi-functional handle for attaching a variety of probe shafts (each available to order separately). You can for instance use longer probe shafts for flue gas pipes with larger diameters or flexible probes for difficult-to-access measuring points
  • Optionally available probes and accessories for further measuring tasks, such as gas flow pressure measurement, gas pipe testing, differential temperature measurement and ambient CO measurement

Smart, intuitive, efficient: easy operation in day-to-day work

  • Smart-touch display for intuitive operation of the flue gas analyzer: the display responds without delay – just as easy as on your smartphone
  • Get the measurement result faster: clearly structured measurement menus for all relevant measurements
  • Create documentation (including measuring value, measuring location and customer data) easily on site
  • Save PDF measurement reports directly in the instrument and always have them available
  • Signature function: your customer can sign measurement reports directly on the instrument
  • E-mail measurement reports directly to the office or to customers via WLAN (hotspot)
  • Large 5-inch HD display – enables you to see all the system's parameters immediately
  • Testo interface function for direct data transfer of measuring values to industry/customer-specific software*
  • Ready to use straight away: in standby mode, the testo 300 is ready to measure at the touch of a button. Use it straight away with the next customer – because you no longer need to wait for the end of the zeroing phase
  • Integrated Bluetooth® interface: immediate printout of the measuring values on site with the appropriate printer

*Note: the manufacturer has to integrate an interface into the industry software to use the function


Other advantages

  • 10-hour rechargeable battery life: an average measurement period of 2 hours means the flue gas analyzer is capable of being used for one week
  • Integrated, extra-strong magnets for easy fixing during the measuring process

Delivery Scope

testo 300 Longlife flue gas analyzer with O2 and CO sensor up to 4,000 ppm, NO sensor, USB mains unit, testo Bluetooth Connector.

Technical Data

General technical data

Operating humidity

15 to 90 %RH non-condensing


approximately 800 g


244 (including probe connection) x 98 x 59 mm (LxWxH)

Operating temperature

-5 to +45 °C

Protection class


Product colour


Display type

5.0" touch display, HD 1280*720 pixels, IPS (160 k)

Power supply

Rechargeable battery, USB mains unit

Warranty conditions



TÜV-tested according to 1st German Federal Immission Control Ordinance (BImSchV) EN 50379, Parts 1-3


Gas sensors (O₂, CO) 48 months; NO, NOlow, COlow sensor 24 months; Thermocouple 12 months; rechargeable battery: 12 months


1.000.000 measuring values

Storage battery type

Lithium ion battery

Battery life

10 h

Storage temperature

-20 to +50 °C

Charging temperature

0 to +45 °C

Temperature - TC Type K (NiCr-Ni)

Measuring range

-40 to +1200 °C


±0,5 °C (0,0 to +100,0 °C)

±0,5 % of mv (Remaining Range)


0,1 °C (-40 to +999,9 °C)

1 °C (Remaining Range)

Differential Pressure - Piezoresistive

Measuring range

-100 to +200 hPa


±0,5 hPa (0 to +50,0 hPa)

±1 % of mv (+50,1 to +100,0 hPa)

±1,5 % of mv (+100,1 to +200 hPa)


0,01 hPa

Flue gas O₂

Measuring range

0 to 21 Vol.%


±0,2 Vol.%


0,1 Vol.%

Flue gas COlow (with H₂-compensation)

Measuring range

0 to 500 ppm


±2 ppm (40 t1 +500 ppm)

±5 % of mv Remaining Range


0,1 ppm

Flue gas NO

Measuring range

0 to 3000 ppm


±5 ppm (0 to 100 ppm)

±5 % of mv (101 to 2000 ppm)

±10 % of mv (2001 to 3000 ppm)


1 ppm

Flue gas Nolow

Measuring range

0 to 300 ppm


±2 ppm (0 to +39,9 ppm)

±5 % of mv (40 to 300 ppm)


0,1 ppm

Differential Pressure flue gas Draught - Piezoresistive

Measuring range

-9,99 to +40 hPa


±0,005 hPa (0 to 0,1 hPa)

±0,02 hPa (0,1 to +3,00 hPa)

±1,5 % of mv (+3,01 to +40 hPa)


0,001 hPa (0 to 0,1 hPa)

0,01 hPa (Remaining Range)

Flue gas degree of effectivity, Eta (calculated)

Measuring range

0 to 120 %


0,1 %

Flue gas loss (calculated)

Measuring range

0 to 99,9 %


0,1 %

Flue gas CO₂ calculation (calculated from O₂)

Measuring range

Display range 0 to CO₂ max


±0,2 Vol.%


0,1 Vol.%

Flue gas CO (without H₂-compensation)

Measuring range

0 to 4000 ppm


±20 ppm (0 to 400 ppm)

±5 % of mv (401 to 2000 ppm)

±10 % of mv (2001 to 4000 ppm)


1 ppm

Ambient CO

Measuring range

0 to 2000 ppm


±10 ppm (0 to 100 ppm)

±10 % of mv (101 to 2000 ppm)


1 ppm


Further probes

€ 417,00
sa PDV-om  € 521,25



€ 118,00
sa PDV-om  € 147,50
€ 83,00
sa PDV-om  € 103,75
Instrument bag with carrying strap

Order Number: 0516 3001

€ 68,00
sa PDV-om  € 85,00
€ 97,00
sa PDV-om  € 121,25
CO replacement filter for sensor

Order Number: 0554 4100

Measurement cells

NO sensor

Order Number: 0393 0151


Mjerenje dimnih plinova na sustavima grijanja

Savršen alat za mjerenja koja uključuju sustave grijanje:

  • visokokvalitetni dugotrajni senzori s radnim vijekom do 6 godina, rukovanje preko zaslona osjetljivog na dodir, jasno strukturirani mjerni izbornici, izrada dokumentacije na licu mjesta, slanje izvješća e-poštom, veliki HD zaslon, robusno kućište

Daljnja područja primjene:

  • mjerenje tlaka protoka plina*, ispitivanje plinovoda*, diferencijalno mjerenje temperature (Temperatura protoka i povratnog toka u sustavima grijanja)*, mjerenje CO u okolini*, mjerenje dimovoda na sustavima grijanja*

* Imajte na umu: Za ta su mjerenja potrebna dodatna sonda ili pribor koji se moraju naručiti zasebno.


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