1. Senior Scientist, SenseAir AB
Possibilities using non dispersive IR-technology for in vehicle measurement of methane gas quality
Ph.D. Henrik Rödjegård
Senior Scientist, SenseAir AB
Ph.D. Ola Stenlåås
Ph.D. Henrik Rödjegård

2. My message
Methane gas from different sources, such as bio gas reactors, differ a lot in composition.
IR-sensors can be used to determine combustion properties of methane gas fuel by measuring the amount of methane and heavier hydrocarbons.
A low-cost system can be implemented in the vehicles fuel system.
Before starting the engine the sensor will give a hint of the gas properties.

3. SenseAir AB
World leading company in Research & Development and manufacturing of cost-effective IR gas sensing
Develops and produces affordable precision carbon dioxide sensors for high volume applications
Competence centre for infrared gas measurements
One of our major markets is building automation where our sensors control the ventilation to create a better indoor environment. 3

5. SenseAir AB

6. NDIR basics (Non Dispersive Infra Red)

7. NDIR basics (Non Dispersive Infra Red)

8. NDIR basics (Non Dispersive Infra Red)

9. NDIR basics (Non Dispersive Infra Red)

10. IR-spectrum

11. Optical filter choice

12. Optical filter choice

13. Predicted performance
Methane 70% to 100% ±2%
“Butane equivalents”* 0% to 15% ±1%
Inert gas content ±3%
Response time ~10 s
Pressure up to 10 bar
Calibration free due to automatic baseline compensation
* Ethane= 0.6 Butane equivalents Propane = 0.8 Butane equivalents

14. A few words about high resolution sensing…
…a GC replacer?