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testo 327-1 - Flue Gas Analyser (standard kit)

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The testo 327 Standard Kit is a professional flue gas analyser for heating engineers carrying out combustion testing on domestic and light commercial boilers. It provides reliable measurement of key flue gas values to support safe, efficient boiler operation and routine maintenance. It is suited to boiler servicing and commissioning, combustion efficiency checks, CO safety testing and fault diagnosis.
  • Standard Kit - including analyser, probe, case, and power supply.
  • Measures O₂, CO, temperature, draught and pressure.
  • Calculates CO₂, efficiency and excess air directly on the analyser.
  • Clear display and intuitive menus for fast on-site use.

testo 327 Standard Kit

The testo 327 Standard Kit is a professional flue gas analyser kit for boiler commissioning, servicing, and combustion performance checks.

How to Achieve Reliable Boiler Commissioning and Maintenance

When heating engineers need clear combustion readings on site, the testo 327 Standard Kit helps make boiler testing faster and more consistent. It is designed for professionals who need to service, commission, and maintain gas and oil-fired heating systems with confidence.
Accurate flue gas measurement helps engineers confirm that an appliance is operating safely from the start. By checking key values during installation or routine service, the testo 327 supports better burner setup, safer combustion, and more efficient heating performance.
The practical kit format helps engineers arrive prepared for everyday heating work. This makes it suitable for domestic properties, plant rooms, and light commercial heating applications.

Why Accurate Combustion Analysis Prevents Costly Boiler Issues

Poor efficiency, high emissions, nuisance faults, and unsafe CO levels often begin with poor combustion. The testo 327 helps engineers identify these issues before they lead to repeat callouts or more serious appliance problems.

The analyser supports:
  • Precise O₂ and CO measurement: Vital for checking air-to-fuel ratio and combustion safety.
  • Flue gas temperature measurement: Helps assess appliance performance and heat transfer.
  • Automatic efficiency calculations: Supports clear service decisions and customer explanations.
  • Real-world application: After servicing a boiler, engineers can check combustion results immediately and adjust burner settings before leaving site.

Solving Safety Risks with CO and Flue Performance Checks

Unstable combustion and poor flue performance can create safety risks in homes and workplaces. The testo 327 supports professional safety checks by helping engineers assess carbon monoxide levels and combustion behaviour during service work.
CO measurement is essential when checking for incomplete combustion. O₂ and calculated values such as CO₂, excess air, and efficiency help engineers understand whether the appliance is burning fuel correctly.
These checks support professional workflows linked to combustion safety guidance and standards such as BS 7967 for carbon monoxide and combustion performance testing.

Streamlining Service Work with Compatible Accessories

Efficient servicing depends on having the right supporting equipment available. The testo 327 Standard Kit can be used alongside compatible Testo flue gas probes, replacement filters, printer options, calibration services, and consumables.

Built for Everyday Heating Engineers

Daily boiler servicing requires equipment that is portable, clear, and reliable. The testo 327 Standard Kit is designed to support practical site use across regular service and maintenance work.
  • Clear combustion readings: Supports fast decision-making.
  • Handheld design: Suitable for tight boiler spaces and plant rooms.
  • Professional kit format: Keeps essential analyser equipment together.
  • Testo accessory compatibility: Supports long-term servicing and maintenance.

General technical data

Weight
(with probe) Approx. 700 g
Dimensions
201 x 83 x 44 mm
Operating temperature
-5 to +45 °C
Display type
LCD (Liquid Crystal Display)
Display function
Backlit 2-line display
Power supply
Battery: 1500 mAh, mains unit 5V/1A
Storage temperature
-20 to +50 °C

Temperature - TC Type K (NiCr-Ni)

Measuring range
-40.00 to +600.00 °C
Accuracy
±0.50 % of mv (100 to 600 °C)
±0.50 °C (0 to 99.90 °C)
Resolution
0.1 °C
Reaction time
< 50 s
Temperature (ambient temperature)

Flue gas O₂

Measuring range
0 to 21 Vol.%
Accuracy
±0.2 Vol.%
Resolution
0.1 Vol.%
Reaction time t₉₀
30 s
testo 327 Flue Gas Analyser, rechargeable battery and calibration protocol, Flue Gas Probe (180mm x 6mm diameter), soft carry case with shoulder strap, AC power supply.
Contact Us
Testo Ltd
Newman Lane
GU34 2URAlton
HampshireUnited Kingdom
01420 544433

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