RASI300 – Flue Gas Analyser for domestic installations

Compact and rugged flue gas analyser, with touch screen color display, suitable for use on domestic gas and oil boilers

  • 5 Years Warranty including O2 & CO sensors
  • CO sensor 0-10000 ppm
  • New Improve O2 LL sensor
  • H2 Blend Ready
  • Standard Bluetooth® communication for use with MRU4U mobile app ( IOS/ANDROID)
  • Menu for Flue Gas, Timed Tightness/let-By Test, CO room Build-up, T-Flow/T-Return
  • Display O2, CO, CO2, Ratio, Flue & Ambient Temperatures, efficiencies( N/G/C), excess air, flue gas dewpoint
  • Display gas pressure and combustion measurements at the same time
  • Multifuel (16) including Nat Gas, LPG, Light/Heavy Oil, Wood Pellet, Wood dry and 4 x user define
  • Li-Ion Rechargeable batteries for long lasting charge – Mini USB charging
  • New 6 Lines touch screen color display
  • Data Logging with site ID, IRDA, SD card
  • Optional NO/NOx upgrade


The new RASI 300 is an high quality Flue Gas Analyses suitable for gas and oil domestic installations

Designed for the UK market
Designed especially for the UK market, the RASI 300 features a unique touch screen colour display and task oriented menu which provide the user with an easy access to all the functions of the gas analysers: flue Gas Analysis, direct draught measurement, pressure and differential pressure measurement, timed letby and tightness test, flow and return temperatures and CO ambient measurement

Meets BS 7967 requirements
This flue gas analyser have been tested to BS EN 50379 and meets the requirements of the BS 7967 and Gas Safe Technical bulletin TB143

The RASI 300 also have a built-in large memory which can store up to 1000 data set,
Li-ION rechargeable batteries which charge trough USB port, IRDA printer and support up to 18 pre-programmed fuels.

Large Memory
The Rasi 300 features an advanced memory function to store up to 1000 data sets. Store value can be review on the large colour display of the analyser or exported to the standard micro SD card ( card not supplied) to a CSV file. Saved data can also be printed using the remote IRDA printer.

Timed Tightness and let-by test
A fully programmable function facilitate the tightness and let by test procedures. Heating engineers can select the time and duration to suits the application. Data are presented on the flue gas analyser display both in text and graphical form.

Quick and easy to use
Thanks to the fast auto-zero , the analyser is ready to be used in 30 seconds. The smart task menu make it easy to select the desired function.

Additional information


CPA1 KIT, Printer Kit, Professional Kit, Standard Kit


O2 measurement 
Range 0 to 25 %
Accuracy ± 0.2 % Vol
Resolution ± 0.1 % Vol
CO measurement with H2 Compensation
Range 0 to 10000 ppm
Accuracy ± 10 ppm or ± 5 % of reading up to 4000 ppm
± 10% of reading from 1000 to 20000 ppm
Resolution 1 ppm
CO2 % ( calculated from O2) 
Range 0 to CO2% Max
Accuracy ± 0.3 % Vol
Resolution 0.1 %
NO measurement (option) 
Range 0 to 5000 ppm
Accuracy ± 5 ppm or ± 5 % of reading up to 1000 ppm
± 10% of reading from 1000 to 5000 ppm
Resolution 1 ppm
Flue gas temperature measurement 
Range – 50 to 1200 °C
Accuracy ± 2 °C
Resolution 0.1 °C
Air Temperature measurement 
Range – 50 to 100 °C
Accuracy ± 1 °C
Resolution 0.1 °C
Flue Gas Draught measurement 
Range ± 50 mbar
Accuracy ± 0.02 mbar
Resolution ± 0.001 mbar
Pressure measurement 
Range – 300 to 300 mbar
Accuracy ± 0.02 mbar
Resolution ± 0.001 mbar
CO/CO2 Ratio Calculation 
Range 0 to 99999
Resolution 0.0001
Efficiency (Net, gross, Condensing) calculations 
Range 0 to 120% ETA
Resolution 0.1 %
Air Ratio Calculation 
Range 1 to 9.99
Resolution 0.01
Excess Air Calculation 
Range 0 to 99.9 %
Resolution 0.1%
Heat losses Calculation 
Range 0 to 9.99 %
Resolution 0.1%
Conversions calculation 
emissions calculation ppm/o2% refer, mg/m3, mg/m3 with O2 reference
Pres-set fuels Nat Gas, Heavy Oil Light Oil, LPG, Propane, Butane, Kerosene,Coal, Diesel,Petrol,Coke, Anthracite, Wood@0%, Wood@10%, Wood@20%, Wood@30%, Wood@40%, Wood@50%, Pellets
Digital & Software
Communications micro USB, IRDA and Bluetooth as standard
Data logging 4000 Data log on internal memory  & SD card
Mobile APP ( Free) MRU4U working on IOS & Android
Software (Optional) WIN4U emissions software
Gas Sampling probe 250×8 mm  gas sampling probe with integrated temperature and draught measurement
Display 6 lines touchscreen graphic colour display
Weight 390 g
Dimensions 82x169x44 mm
IP protection IP 40
Power/main Li-ION rechargeable batteries, 2250 mA/h , USB charging AC 100-240 VAC, 46-63Hz, USB lead and wall charger supplied
Operating/Storage temperature 5 to 45 °C/ -20 to 50 °C
Warranty 5  years warranty when serviced annually by EIUK
Approvals Conform to BS 7967 , TUV SUD tested to BS EN 50279-1&3

Service Price

Year 1 Year 2 Year 3 Year 4 Year 5
£ 99 £ 99 £ 99 £ 99 £ 195

Price Ex Vat
£ 13 carriage apply
2 Days Turnaround


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RASI300 – Flue Gas Analyser for domestic installations