Sat 1 Sep 2007 19:29 Gunsons Gastester Professional - odd readings? Cabotage Law Philippines Pdf. - pmh I think I can remember seeing the same sort of readings on a similar tester even when calibrated correctly. However just check that the calibration has not drifted by checking the free air 2% reading at the end of your test. Mine was never very stable and I think that the sensor can be battery voltage dependent if you rev the car the car under test and if the alternator regulation is poor. If you find that is the cause, use a battery supply from a different vehicle or static well charged battery. My tester was always accurate when checked against MoT for levels around the 2% figure for non cat vehicles I cannot remember the exact physics of the sensor but I believe it is to do with the thermal conductivity of the 'air(mix)' which will vary with the relative proportion of gases. Hopefully NC will be along with a more quantitative description of the physics.

If the manual recommends a CO level at a particular engine speed. 1.Place the Gastester Professional on a convenient flat surface close to the vehicle’s exhaust. Gunson's Gastester review. In the owners manual for your car there is a spec for%CO in the exhaust gas. I had a Gunson gastester professional for years.

Cartea Despre Nimic Pdf there. -- pmh (was peter). Sat 1 Sep 2007 19:39 Gunsons Gastester Professional - odd readings? - Number_Cruncher >>Hopefully NC will be along with a more quantitative description of the physics. Way beyond me I'm afraid. Dissociation, chemical rate kinetics, all foreign and slightly scary subjects for me! My guess is that the sensor is being comletely fooled by reading the gases downstream of the cat.

On a pre-cat car, a certain level of CO would be accompanied by an amount of HC and NOx - i.e., the composition of the mixture as a whole would vary in a known way. This known relationship is changed by the reactions in the cat. Having said that, if the CO is anywhere near 1% as suggested by Haynes, there's something sadly amiss, I would expect 0.0% or certainly less than 0.3% Number_Cruncher.

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