Classic cars forum & vehicle restoration.
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Tue Jul 14, 2009 10:35 pm Post subject: Exhaust Gas Analyser |
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I picked up one of these at Glamis. Needless to say it doesn't work. Does anyone happen to have operating instructions or principles of operation for it?
Peter
_________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon
Last edited by peter scott on Fri Jul 07, 2017 7:02 pm; edited 1 time in total |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4104 Location: South Cheshire
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Posted: Wed Jul 15, 2009 10:13 pm Post subject: |
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Hi Peter
If its anything like an older one that I have its based on a wheatstone bridge , the co2 sensor generates heat (from a catalitic reaction with C02) and a thermistor fixed on the sensor changes resistance, this resistor is part of the bridge and the meter is the galvonometer across the bridge.
Hope this make sence!!
Cheers Dave |
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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Posted: Thu Jul 16, 2009 12:34 am Post subject: |
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Thanks for replying Dave. I'll give your description some thought. Actually since reporting it faulty I discovered that I was missing one of the water collectors on the rear but fortunately my wife came up with a suitable shampoo bottle and the analyser appears to be working. It has two scales,
0-2% and 0-10% and it has a more prominent graduation at 4.5%.
I'm not sure what reading I should calibrate it to in fresh air but have been using a value of 2% as this figure is used in the Gunsen analysers.
Do you happen to know what calibration reading is correct and what the significance of the 4.5% is?
Thanks,
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4104 Location: South Cheshire
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Posted: Thu Jul 16, 2009 10:39 am Post subject: |
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Hi Peter
I have a couple of these things, a Gunson one where as you say is calibrated to 2% in fresh air and one on a Crypton tuner where you set it to 0%. By way of a check you could see what reading it gave on something that has just had an MOT where an emmisions test has been done, adjust to match the MOT reading and then see what the fresh air reading is?
The significance of the 4.5% is that this relates to what C02 the optimum 14.7:1 mixture ratio will produce.
Dave |
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peter scott
Joined: 18 Dec 2007 Posts: 7118 Location: Edinburgh
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