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Gunsons gastester professional manual full#with the full instructions Operates from 12V Measures CO level (typically. Gunsons gastester professional manual professional#I did think it was almost impossible to get it even close to 2.4% but there was a sweet spot around 4.5 ish where it was happy. You are looking at a Fantastic GUNSONS Gastester Professional Analyser G4121. Sweet, that's really handy to know, I set it today at 2.4 and it runs much better but if what you are saying above is right then i'm still 2% out. The thing I did notice is you really do have to following the intstructions about letting the machine settle down for a good 10 mins before using it. Exhaust gas is pumped through the Gastester by an externally mounted pulse pump. There's a chart that explains it in the instructions. Gastester is an exhaust gas analyser that works on the hot wire or thermal conductivity principle: the thermal conductivity of exhaust gas varies in proportion to the amount of carbon monoxide present. ![]() 3.9% CO gives 400ppm HC, but 2.4% CO gave 700ppm HC. Also I think that if you set it any lower than this the HC starts to go up - mine did. As stated above this was right on the edge of how low you could go before the exhaust idle note started to "puff" every now and then. Next time I will calibrate to 0% in air.Īnyway allowing for my adjustment above it went thru the test at 2.4% - spot on what I was aiming for. No - they said - the instructions are still good.Īnyway all I did was take 2% off the readings. The tester is calibrated in air to read 2.0% so I figured the instructons in the box were out of date. I know this because the only thing the mini failed on was emissions and I had to get it fixed - and I wasn't paying somebody else to do it.Ĭross calibrating against the mot emissions machine I found that the tester reads 2.0% high. The advertised spec is 0.5%, but I don't know exactly what they mean by that spec (it could be a percentage of the full scale reading, or an absolute %CO variance, or something else.I bought one of these gas testers a few weeks ago and found that it is brilliant - except for one small point - it reads exactly 2.0% high ! Product group, Automotive Parts and Accessories. Over the range of interest, the %CO does relate quite accurately to the A/F ratio, but I don't know how absolutely accurate the Gunson %CO reading really is. Gunson G4125 Gastester Digital, B002XF1VW6, 505315513410, G4125 at camelcamelcamel: Amazon price tracker. But slight changes would show on the Gunson. The difference between a smog test pass and fail on the '78 was not enough to notice via lifting the piston, listening, monitoring a tach, or driving. And the '67 doesn't need to be nearly as accurate as the '78 needed to be. The SU HS4 carbs drift with temperature way more than the ZS did, and this showed with changes on the Gunson as the under bonnet temperature changed while trying to set the mixture. Small changes to the ZS carb did show up as %CO changes, and once warm it was reasonably stable on that car. ![]() Gunsons gastester professional manual manual#It allowed me to set the %CO on the '78 as specified in the manual for a smog pass. It does drift a *lot* as it warms up, and it drifts some after warmed up, but much more slowly. I would hook it up to a stand alone battery and let it warm up for a while before trying to use it. I have a Gunson Gastester that I used to use on my '78. This music production program also includes mixing utilities for those eager to create their own remixes and sports such professional studio recording effect options as reverb, flanging, echo, audio.
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