TNP #42 - Combustion Gas & Emissions Analyzer E1500 (O2, CO, CO2) Repair, Teardown & Experiments
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- Опубліковано 17 лис 2023
- In this episode Shahriar explores the technology behind combustion gas analyzers. These instruments are capable of measuring the concentration of various gasses such as O2, CO, CO2, NO2, SO2, etc. The particular unit shown in this video (E-Instruments E1500) is capable of holding two sensors.
The end-of-life Oxygen sensor is replaced to bring the unit back to life. The teardown of the instrument as well as the faulty Oxygen sensor are presented along with Raman chemical analysis of the sensor electrolyte. The biproduct of a burning candle as well as a HotHands hand warmer are analyzed using the instrument.
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I do field measurements on boilers and yours results are Ok. Flue pump draws more than candle produces and that is why you have high oxygen content in flue gas. I also developed some hardware for my needs and if i remember well one electrode usually is Pb and second one is platinum. Pb is consumed even when sensor is in pure air. That is why life is max 4-5years. Those instrumens ussualy are destroyed when sensor leaks and pcb is corroded. But you have got nice unit.
It makes sense to have a high oxygen content since carbon monoxide is really bad. Perfect combustion would be ideal from an efficiency perspective, but given that there are many factors involved that makes the combustion influenced one way or another - even weather variations - tuning for a somewhat lean mix with remaining oxygen in the gases makes sense.
I am very jealous of your fancy raman spectroscope
That is the same exact model I retired last year when the sensors and calibration cost more than a new one.
We use analyzers similar to this tool welding in live gas plants in the oil and gas industry. Ours are to determine levels of poisonous or flammable gas for safety reasons of course. Even sounds similar when the pump is running. We like to know exactly what atmospheric environment we are about to arc and spark in lol.
The LEL sensor has to be changed regularly as it uses an interesting method for detection. It's a wheatstone bridge where one side is a reference and the other heats up and, when a flammable gas is present it heats up faster changing the resistance. A catalytic bead from what I can find out
Now Pooch has to sign the print out to make it official 😺
That Raman machine is pretty sweet. I have absolutely no need for it but I want one.
Very interesting video indeed. Thanks for sharing with us.
That Agilent Resolve Raman @ 11:29 is quite the machine @ $65,000 USD
Talk about extreme overprice.
I loved this episode, thanks! Using the r. Spectroscopy device to see what's in the sensor material and the candle was the cherry on the top of the video:)
I'd love to receive an order for such project someday.
It would be pretty interesting to see if you can find a way to make the other 2 sensors work, although it looks like you would also need the other 2 boards and ribbon cables. CO and CO2 are the only ones needed for adjusting boilers, although NOx is definitely helpful when adjusting blue burners (oil burners with an EGR valve), and SO2 could maybe be helpful when working with heavy oil, although the SO2 and NOx sensors are mostly intended for- and required when fixing block heat plants (generators that use their engine's waste heat to heat your house, and you can either use or sell the power as a bonus). I personally use Testo analyzers, so it's interesting to see the insides of another company's tester. On the Testo, all its guts are held in place by the clear rear cover (no wobbly BT module), and would likely fall out if I were to take that off, which is also why I will try and avoid that as long as possible. You are also specifically told to ABSOLUTELY NEVER whack it, drop it, toss it into the plumber van, on the floor, etc..., likely because things like that module might come loose or break inside. Also, in Germany, we stick the printout onto the boiler with a piece of tape, so everyone can see that it meets emissions and what values it had after the last adjustment, and see how much they changed now.
That first shot gave me scale-shock! My brain had decided that this was the size of an old-skool phone handset, and your hands looked TINY! lol
And if you think this one is huge, you haven't seen how big the first ones were in the 80s.
I have probably around 100 or more of those O2A2 sensors laying all around. Obviously all of them aren't working anymore. Electrolyte leaks are very common, I have seen many Ventix MX4s destroyed by those leaks (or rather by the people trying to clean it up). 2 years is rated lifetime of O2A2, they usually last for about 2.5 year in fact. The way it works is by having around 100-150 ohm resistor connected between the leads (to give it a little load), then you can measure the voltage by the help of ADC. The voltage under load is very small. The voltage in open circuit seems to be around 0.5V or so.
How come you have so many sensors?
I am working as gas detection system technician. Back in the days I used to work from home so I have some of those sensors still around.@@Thesignalpath
Cool!
This was great and good 👍 thank you-
Very Interesting! 🙂
To make the two other sensors working, you will need the electronics boards (signal conditioning and calibrations coefs) and a parameter tweak in the software configuration. Might be able to tell you more about it but definitely not here.
Thank you, very interesting. Please feel free to email me if you get a chance.
I use an inline amperometric oxygen sensor (Mettler InPro 6800) for my fish pond. Unlike this sensor, you can replace the electrolyte when it's consumed.
Those oxygen sensors have a fairly short life - typically a few years. They are, however, a very standard shape and pinout. Might be worth looking at something like an ME2-O2 sensor as a replacement, which should be easy to fit. Last I checked they were about $60 @ qty1, but the price may have come down since.
13:28 Pooch was the operator.
Check the CO2. Outside it should read around 400-450 ppm, in a room typically 600-2000 ppm depending on the ventilation and the number of occupants. 0.2% = 2000 ppm in your lab is probably not healthy.
May be the thing with precission of the instrument. Instrument have resolution of 0.1% so don't expect it to be that accurate when measuring low gas concentration values, because usually the accuracy is much worse than resolution. CO2 and CO sensors also do require regular calibration with span calibration gas, while O2 sensors can often be calibrated by ambient air. Replacing sensors without calibration is usually giving you very inaccurate (often highly exagerrated) results. In Poland (where I live) multigas sensors (that use the same sensors) have to be calibrated every 180 days, and also after each replacement of the sensors.
Was just wondering about that when it said 0ppm
This device can't be used as any kind of air quality analyzer. It is HVAC tool to check furnace etc. It calculates CO2 using data from O2 sensor and atmosphere model. Works good enough for exhaust gases after burner but O2 sensor doesn't have enough accuracy to reliable calculate CO2 level in room air.
The 0.2% was him breathing on the sensor.
Nice sharing Vidio.. God Bless You.. greeting from Indonesian traditional gold Prospecting 🇮🇩🌺🌺👍
I'm assuming the current levels of the ec sensors are pretty, do they use any special techniques to read the current or is just a shunt resistor?
Do you want some calibrated gas standards? I picked up a flammable liquids cabinet at an auction last year, and inside it were about a dozen cylinders of various calibrated gas mixtures for testing detectors like this. They are each about the size of a 1lb propane cylinder. All well past their expiration dates (unfortunately, as new they cost several hundred dollars each), but still might make for interesting experiments. I only have them still because I haven't figured out how to legally throw them away. Not quite sure what the best way would be to send them from the DC area to New Jersey, but they are yours if you want them.
Thanks for the offer! Interesting for sure. I also don’t know how to ship them. I might have to drive to DC at some point, maybe I can pick them up.
And now your challenge….. add 2000! Make it work!
👍
Why not measure the combustion gas from a resistor as it burns up?
Picked up a different model from a garage sale with a dead sensor that I havent looked at yet. Hopefully not going to cost the 230 each you paid for those sensors lol
Why are the subtitles so dark, ie, not easy to read.
That's an odd looking TV remote
the potassium hydroxide should react with CO2 in the air to form potassium carbonate, why does it still read as carbonate free in the raman?