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I need to get analyzer working

I've been looking for exhaust analyzer's so far with no luck.

I have this Delco analyzer, late 60's early 70's, and everything works except the mixture analyzer. It is a red box with a fan inside that pulls sample exhaust through the sensor. I looked into it a long time ago, and as I remember the fan works, so it must be right at the sensor.

The question is, what kind of sensor is it going to be, is it like an o2 sensor?, or was there another way they measured this in the past?

If I have some idea how it works, I've got a shot at making it go. Or it could be a lost cause, what do you think?

Thanks in advance
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Old 01-15-2003, 10:20 AM
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it's part of this unit
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Old 01-15-2003, 10:28 AM
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SDS sells a mixture meter for $78. US, here's the link, about half way down the page:

http://www.sdsefi.com/
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Old 01-15-2003, 12:22 PM
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Hardflex, any idea what kinds of gases it is supposed to test for? CO, O2, HC, NOx?

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Old 01-15-2003, 01:35 PM
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the only indicator reads air/fuel mixture. It has an adjustment to Calibrate (before inserting into tailpipe) at 13.2-13.3 to 1. would that make it an early o2 sensor?
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Old 01-15-2003, 01:48 PM
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It could be. I'm really not at all sure.

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Old 01-15-2003, 03:05 PM
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I'll check first for continuity in all the wires. There are two wires going the to sensing mechanism, maybe a heater wire and sensor wire. It could be the heater wire is broken. Could also have seen leaded gas somewhere and messed it up somehow.

I'll approach it as an o2 sensor and go from there.
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Old 01-15-2003, 04:26 PM
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I don't think it is an O2 sensor.

What is the read out? 3 GAS?

Moss Motors also sells one.
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Old 01-15-2003, 05:00 PM
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I have a small Heathkit unit and it uses a thermocouple sniffer thingy. It works fantastic and I picked it up from ebay for 60.00. It was never used. They made them in the mid to late 80s. I like the no brainer VU units.
Old 01-16-2003, 07:47 AM
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There are many systems and methods for exhaust gas analysis. Unfortunately, they're often misapplied, resulting in measurement problems. Narrow-band O2 sensors are a good example, great for lambda control, not so great as a method for measuring A/F ratio over a range of interest to tuners. The dual thermistor sensor (not thermocouple) used in the Heathkit also has a number of secondary interferences that limit its accuracy (I know, I have one, too).

If you want accurate two-gas sensing for a reasonable price, go onto Ebay and buy an IR dispersive analyzer. I've seen them for $200, they measure HC and CO in a fairly wide range with decent accuracy. If you want more, you're talking about a pro instrument, get ready to pay fairly large $$ for a good tool. If money were no object, I'd love to have one of those PDA-sized 5 gas units.
Old 01-16-2003, 09:25 AM
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Brad, I did an ebay search for IR analyzer, dispersive analyzer, nothing there. What do I need to search for.
I've seen the heathkits, there's one there now.
What are the principles of a dual thermistor sensor. Something tells me that's what I have too, it would fit the time frame for this unit (early 70's). I noticed there are two rheostats in the sensing box where the exhaust flows to, looks like adjustment controls, in addition to the calibration knob on the main body of the unit. If it is a dual thermistor, how could I check each sensor if necessary?
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Old 01-16-2003, 01:10 PM
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I'll see if I can find some info on those analyzers to give you some search terms.

I have no idea of if your analyzer is thermistor based. The way the Heathkit works is that two matched thermistors are legs in a Whetstone bridge, one thermistor is in a reference gas cell, the other is exposed to exhaust gases, in an thermal slug assembly. The thermal transfer rate of exhaust gas varies with the CO content, causing the bridge to be unbalanced and a current to flow in through the meter, registering as the A/F (and corresponding CO) level.
Old 01-16-2003, 01:33 PM
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You need to work on your Ebay search skills !

I found this in about 1 minute, searching on "gas analyzer":

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1876815733&category=6754

or this one:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2400229176&category=6754

Both of these are in extremely nice condition, are shop quality, and command a high price ($800) for "buy it now". I've seen decent quality analyzers like this for as little as $200.

Send email to the guy who is listing these, "dr.smogtest", he's willing to help you and I've spoken with him in the past, he's got a big inventory of testers.
Old 01-16-2003, 01:37 PM
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Another thing occured to me (duh) - contact dr. smogtest to find out info on your tester. I'll bet he's totally familiar with it and can let you know if it's worth fixing.
Old 01-16-2003, 01:43 PM
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I think you're right, I'll email him the pictures. I may be able to ups it to him for repairs and back again if necessary.

My ebay searches were usually "Exhaust analyzer". from the way Dr. Smogtest titles his auctions i missed his stuff every time.

Thanks for the tips, I'll let you know how it works out.

PD
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Old 01-16-2003, 02:22 PM
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