RASI300C-4 Flue Gas Analyser for 02, CO, NOx with bluetooth and printer

Compact and rugged flue gas analyser, with touch screen colour display, suitable for commercial Gas, Oil solid fuel installation

  • 5 Years Warranty including O2 & CO sensors
  • O2 long Life sensor up to 5 years
  • CO sensor 0-20000 ppm (H2 compensated)
  • NO(NOx) sensor 0-5000 ppm
  • TUV approved to EN 50379
  • 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 colour display
  • Data Logging with site ID, IRDA, SD card

Price: £1199

Inc VAT: £1,438.80


The RASI300C-3 is a flue gas analyser suitable to carry out installation and maintenance works on commercial Gas, Oil and Biomass fuel heating systems,

The EN50379, Parts 1-2 TUV certified RASI300C is supplied with O2 and CO H2-compensated sensor up to 20,000 ppm, NO(NOx) 0-5000 ppm, 250 x 8 mm triple hose robust flue gas probe, bluetooth communication to our award winning MRU4U mobile app,  fast IRDA printer, tightness test hose and custom made carrying case.


Fixed Service Cost with only 2 days turnaround
The RASI 300 flue gas analyser is subjected to a fixed annual service cost of 99 GBP+ VAT which include the cost of servicing, calibration, the replacement of the O2 and/or CO cell when required and the issue of new calibration certificate with full test data valid for 12 months. This annual fixed service cost offer many advantages: low cost of ownership, keep the analyser with-in its 5 years warranty, you know exactly the running cost of your analyser, ensure that the analyser is fit for purpose and keep the analyser with-in the required legislation.



O2 measurement 
Range 0 to 25 %
Accuracy ± 0.2 % Vol
Resolution ± 0.1 % Vol
CO measurement with H2 Compensation
Range 0 to 20000 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 4 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&2


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RASI300C-4 Flue Gas Analyser for 02, CO, NOx with bluetooth and printer