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What is Petrol
Exhaust Emission Analyser
( Petrol Gas Analyser )
and how does it
help us diagnose an engine
Typical modern Test Station for
Petrol exhaust emissions
Typical modern Portable
Petrol exhaust emissions Gas analyser
Typical modern Test Station for
Petrol and/or Diesel exhaust emissions
An petrol exhaust gas analyser is a mandatory item for MOT/DOT testing stations around the world and should be regarded as essential equipment for any modern self-respecting vehicle repair workshop. With carbon tax and footprint getting ever more expensive, one needs to ensure his vehicle compliance before each MOT test and help save the planet and its own pockets in the process.
A quick health check of the
engine management system can be done by carrying out an analysis of the
exhaust gasses using an petrol exhaust gas analyser.
Exhaust gas analysis provides useful information about the engine’s
operating conditions as well as the efficiency of the catalytic converter. It is
therefore an essential aid to fault diagnosis.
Measuring the petrol exhaust gas components is a very quick, simple and non intrusive test. To use petrol exhaust gas analysis effectively however, it is first necessary to understand the composition and typical quantities of the gasses. The five main and most useful for diagnostics exhaust gasses are:
- Carbon Monoxide - ( CO ). Measured in %.
- Carbon Dioxide - ( CO2 ). Measured in %.
- Hydrocarbons - ( HC ). Measured in ppm (parts per million)
- Oxygen - ( O2 ). Measured in %.
- Oxides of Nitrogen - ( NOx ). Measured in ppm (parts per million) (includes nitric oxide-NO and nitrous dioxide-NO2)
Petrol Exhaust Emission Analysers are coming in different flavors but the
two main groups are portable and stationary units. PC based units usually
have more useful features than the Stand alone ones.
Both
groups have their pros and cons.
This article may help
you choose the correct one for your particular application.
The Petrol Exhaust Emission Analyser is essentially a scientific instrument and good care should be taken when operating one. Regular service and when necessary, calibration of the unit, is essential for keeping it accurate.
Warning: An Petrol Exhaust Emissions Gas Analyser is NOT suitable for measuring Diesel Exhaust Emissions! Attempts to do so will result in seriously damaging the petrol gas analyser!
What to look for when choosing a Petrol Exhaust Gas Analyser?
- First and foremost is
back up service and maintenance. Most Gas Analysers have to be calibrated
(or at least checked) to maintain optimum accuracy at least once a year.
You don’t want to get something that no one can service or repair if needed. User maintenance (on modern units) is usually down to changing the filter/s when necessary. - Is it DOT/MOT tests capable?
- Does it have Automatic vapour/water extraction?
- Are the digits clearly visible when away from the machine (at least 2 metres)?
- Can it Record the gas values for later evaluation?
- Does it have Diagnostic capabilities?
- Does it provide any Help when you get stuck for any reason?
- Does it have a Customer Database to save their results for later printing or evaluation?
- Does it have acceptable printing capabilities? Some print on small sized paper.
- Can it include your Customer names in the Print outs?
- Can it be Upgraded later to 5 Gas if necessary, and what is involved?
- Can it measure also CNG, LPG (i.e. natural gas fuels)
- What More does it have to offer, compare to other makes and models?
- Is it reasonable priced for what it has to offer?
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