Tire sealant chemistry and tire pressure monitors
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- Опубликовано: 12 сен 2024
- Demonstration of how tire sealant works and how it can damage tire pressure sensors.
SP100 pressure sensor: www.sensonor.co...
Toyota uses SP311 TPMS sensors too: www.eetimes.com...
I don't often see thank you comments on your videos, while you of all people deserve a tremendous thank you. Please never stop Applied Science. Your hard work, though fun I'm sure, is much appreciated. Of course, great job on this video!
The tire pressure monitoring system on my car is pretty neat. There aren't any sensors in the tire at all. The car just monitors the rotation rate of the wheels and sees if they're all the same. If you change out the wheels, the sensor may give a low pressure indicator, but you can re-calibrate it to the new wheels. I like this because I don't need to worry about any of those sensors or special wheels.
LazerLord10 Audi that is?
Ben, the latex is in a water-based emulsion and the ammonia serves a dual function as a stabilizer and as a vapor phase corrosion inhibitor for the aerosol can. There are numerous other chemicals used in the product that are not listed on the msds because of their low toxicity - water, for example.
The HFC-134a (1,1,1,2-Tetrafluoroethane) is used for safety purposes as it is the only non-flammable propellant in commercial production. Mechanics working on a tire that had been inflated with the aerosol repair product, could accidentally strike a spark against the rim and cause the contents to ignite if a flammable propellant were used.
Use of 134a is no longer allowed in air duster products, and is being phased out of general use except for medical products and a few critical manufacturing applications. Use in tire inflators is prohibited as of 1/1/2016. The phase-out for auto air conditioners will be a few years later.
Thank you for this video! I work at an auto shop and we replace TPMS sensors. I work with them every day. Fix-a-flat is miserable to work with. I've always wondered how they can put "TPMS-safe" on a can when it will obviously cause problems to a sensor. To make matters worse, many manufacturers are skipping a spare tire and instead providing a "kit" in the trunk which consists of fix-a-flat and/or a 12V inflation pump. Sensors are actually very very reliable under normal conditions and many times end up being tolerant of some sealant exposure. Most sensors, including the TRW sensor you have there, will make that 550mAh battery last for 8 years of use and beyond.
I really hate it that chemicals are never stated by name on products. Especially for cleaning products and glues, but also paints, lubricants and in a wider range plastic products it's always just "organic acid", "surfactants", "organic solvent", "plastic".
There are so many things you can damage or destroy by using the wrong chemicals on it. And so many things to easily fix, if you know what they are made of.
That's why it's so handy that manufacturers publish the MSDS (material safety data sheet) for products like that. I think that's required by law but I'm not sure on that. You can use the MSDS to see what chemicals are in the product and what the overall product health and safety hazards there are, and then do the same for specific individual chemicals.
*****
Yes, they have to make it available to you, if you ask. But try getting ahold of it while you're in your favorite DIY store. If you're lucky they publish it online and you got a mobile that can access it. Still quite a hassle if you're standing in front of a shelf full of glues.
Plastic parts don't have a MSDS at all, so it's mostly experience to be able to tell what something is made of. I often buy stuff, like pipes, conduits, hoses, aso. not for their intended purpose but to use it in a project where I need to glue, seal, mold to it. If you got something out of PE or PP for that, you're out of luck. One of the best ways to determine the type of plastic, is to burn it. But my guess is, my DIY store won't like that for some reason. ;)
Where I live they have to and yes its Latex in these, we have similar ones and its stated latex.
superdau If you happened to make such a product, I guess you would tell your competitors what it is made of only reluctantly :P
Fix a Flat almost killed a friend of mine. As the tire was filling the Fix a Flat sprayed out of the hole in the tire covering there upper body. Next thing my friend remembered is waking up in the hospital on a ventilator. Latex was not listed on the can and my fried is HIGHLY allergic to latex and had a severe anaphylactic reaction to it. A police officer found my friend unconscious and got them medical help.
Michael Carroll Your friend needs to be more careful when repairing a rubber product, as there is a damned good chance that the repair method includes latex.
thats not the anecdotal confirmation of latex i was hoping for nor expecting
Really digging all the variety you have in your videos, from Fix a Flat to x ray generation, keep it up!
Your videos are an inspiration when it comes to analyzing a problem and approaching it through a scientific way.
Going on a hunch here....... I imagine when there is pressure in the tire above a certain level (just say above 15psi for argument sake,) the sensor circuit would be completely switched off, or be disconnected from the attached battery, for any sort of battery life to be possible. When the tire drops below a stated pressure (say 15psi,) the circuit attached to the battery would switch on, transmit a small signal that either the ECU/PCM or body computer would pick up, then produce an "idiot light" or warning lamp. Refilling the tire would then put pressure on the switch, disconnecting the battery from the small transmitter again..... And off you go.
Cars that I have seen that have pressure sensors, can give an exact pressure measurement at anytime on all tires
LittleMe I Imagine the more you check your tire pressure using that system, the faster the batteries go dead. Unless they are using some other system??? My little car has a button you push to check for a warning, but no pressure stats available, just a warning lamp if there is an issue. I wonder if it just alerts the ECU/PCM or body computer to look for a transmitted signal?
+Mr Carlson's Lab wouldn't you want to know if you're tires are over pressurized too?
What serendipitous timing, I just dumped a can of this stuff into a tire myself and was incredibly curious what it is all about. It's like you read my mind and made exactly the video I wanted! Keep up the good work!
I absolutely love this channel. This is one of my favorite science/engineering channels by far. You do such unique experiments and explain them so clearly. Thanks for going through the trouble to make these. I look forward to seeing more in the future.
You're knowledge and ingenuity are as impressive as your range of tools and gizmo's!
That was actually the most interesting flat tire story I have ever heard.
The level of detail you go into on these videos is fking above and beyond...subscribed
"hold upright"
*holds sideways*
Since rubber is modified latex from latex trees your guess makes total sense. The naptha solvent would help the latex bond with the rubber then evaporate to add to the air pressure. Nice work!
I worked in an auto repair shop during college. I hated working on tires that had been filled with fix a flat. It was difficult to clean it out from the inside of the tire. Thankfully it was rarely used and often times when it was, the tire wasn't repairable.
How do you clean it out? Not looking for a detailed answer, just very curious.
RimstarOrg There would be a puddle of liquid fix a flat in the tire. We would take it out to the parking lot and bounce the tire around to knock what we could out. Then we would spray the tire out with a hose. Next we would bounce the tire around to remove most of the water. You would then have to use rags to soak up any remaining liquid. The patching process involved abrading the rubber and using a chemical cleaner which would remove any fix-a-flat film in the area of the puncture.
ricksite
I see. Thanks for the answer!
Been there - done that. That shit would stink also!
Slime is a whole lot better and easier to clean out of the tire.
Weren't you measuring the current on the circuit while its at room atmosphere, quite likely that the sleep state is at 35 (or so) psi and since room pressure is a lot lower its always triggered on.
@R Mack My sensors will dynamically update while the vehicle is stationary. I regularly use them to top off my tires since they are consistent between sources. I have tested them against a calibrated dial gauge and they are quite close. I plan on taking mine apart when I replace them since I am getting occasional TPMS failures but before now I was expecting some thrust based recharge function. That way they could use a supercap instead of a battery. The cap would eventually wear out too, but the recharge would help prolong the power state. They transmit on very low power on 315MHz. I bet the chip contains a serial EPROM. The transmit data would be the serial and the pressure. the programming is so the BCM can ignore any other sensors that it may pickup. It probably works similar to toll transponders which transmit at 0,0005w.
One of the more underrated videos you've produced. I experienced this recently with my tire.. and wal-mart won't touch your TPS so I made them give me the sensor and it's been sitting in my console ever since. I think I'm going to repair it instead lul.. The battery looks to be comparable to a 2032 and the PCB can easily be cleaned/repaired.. I did not know 'aromatic was a description of the molecular shape; that blew my mind!
*R-134 use in this case is ingenious! So now the question is: Did I break federal regulatory law by depressurizing my tire without collecting the gas! I wonder who got paid for them to bypass that one..
I would push back against your premise that the TPS internal port would not affect pressure sensing because if the modulus of elasticity of the sensing port has changed then the resulting pressure would also change. That's to say, if the sensing IC was not permeated by the solvent. Just as if you corrode the spring on a lawnmower carburetor flow regulator or any such calibrated device. Fun video. Thanks!!
Great work, as usual. I wondered when you discussed the higher duty cycle time (when testing the failed sensor) if the absence of normal tire pressure causes it to send on a more continuous basis to raise the alarm about the low pressure. But when in the tire, I agree that even blockage of the port wouldn't cause a low pressure alert as long as the plug is soft or springy, as it would be. Aromatic solvent and ammonia mixture sounds pretty bad for electronics. Not going to buy another new one to do destructive testing and comparison? The manufacturer should have made that caviat clear at the same spot that they said it was safe for tires with sensors.
pressure sensor charges the battery wirelessly. Behind every wheel arch cover lies the antenna than with induction charges the battery while the car is running. Just like the induction ring around ignition key that charges the key battery (like in bmw, audi, MB)
Once again Ben - A superb video get me through my morning coffee. Thanks!!
I used a lot of Fix-A-Flat in high school because I had bad luck with tires. Cool video.
Ben, you might be interested to know that the law doesn't require tire pressure sensors per se. The law only requires that the tire pressure be monitored. The way many manufacturers do this is with the ABS sensors. The computer monitors the pulses from the ABS sensors and detects differences that would indicate a tire changing in diameter.
Fantastic research and experimentation. Thanks for the great content.
Wow. I always kinda knew how this stuff worked but what I never considered was how the tire regained pressure. Thats pretty neat using the R134a. I always assumed the foam was like the gap filling spray "great stuff" is its name. I always thought it was that and just co2. Thanks for showing us this!
Excellent walk-through analysis of the fix-a-flat. We had similar occasion to use it and next day at the garage our mechanic, "fuzzy", chewed us out. Apparently the stuff is very difficult to clean from the tyre. He is not a proponent of the product, but said that it has also saved many customers from more expensive towing or simply accident by lingering in the roadway trying to change out the flat.
Inquiring minds would like to know if in fact the pressure sensor element failed, and/or if the fix a flat chemical soup managed to break through the conformal coat. Would replacing the sensor (or clearing its port) fix the current draw issue? I say clearing its port as the question remains as to whether or not the material hardens over time, hence rendering the sensor useless after a few weeks.
Would be great if you might continue the analysis, letting the stuff sit for a while, etc.
Excellent video. Last year I had a flat and temp fixed it with a can of Fix a Flat. Brought it right over to the mechanic to get plugged and he said he hated the stuff as it is such a pain to clean out the inside of the tire. As for the temp sensors, I've got a 2009 Chrysler and within the same couple of month time span all four tire sensors failed (I'm guessing the battery). So they lasted for almost five years and cost $100 to replace, each!
Very interesting as usual Ben.
I had an Audi A3 with a tyre pressure warning system that was much simpler and wouldn't have that problem. I think it just used the wheel speed sensors of the ABS system to detect a wheel being under inflated as presumably it speeds up relative to the others due to the reduced diameter. If you changed a tyre you had to press a reset button to recalibrate it for the new diameter.
I am not sure if it could detect them all slowly going down at the same rate but that probably never happens. It seems like a much better scheme than battery operated devices in the tyres.
FT-IR(Fourier Transform Infrared Spectroscopy) would show weather it was latex in it.
If I wasn't leaving my company next week, who have a FT-IR, i would have tested some. Its called Tire Weld in the UK.
Cool, I would also love to see a video going into more detail of how the sensors work and how that device communicates with the car, e.g., can it be spoofed?
Also, what happens if you dip the sensor only in some 99% alcohol for a while, then clean it out with a blast of air?
Yes, I was thinking of talking more about the RFID aspect of the system, but this video was already 10 minutes, and I wasn't having much luck with getting usable signals from the chip. If I detect some interesting signals, I may make another video. On some cars like my Honda, the sensors each have a unique ID number. After replacing a bad sensor, the car's main computer must be updated by a specific Honda interface tool to include the new sensor's ID. Only a Honda dealer can do this. Clearly the engineers of this system didn't spend much time thinking about how the car could "learn" new sensor IDs automatically or even semi-automatically.
I would've enjoyed the electronics side a bit more :) I was trying to think about how the sensor would communicate with the on-board system, thinking it wasn't using batteries because of it having to be serviced, but after looking online I was a bit let down to learn they do in fact use batteries. They could at least use a special port to charge them on the value head :D
Nitrxgen
I wonder, with all of the movement a car wheel goes through, couldn't they add something to both the wheel and body of the car to make some kind of electric generator, even if it is horribly inefficient, if it could generate enough power to charge a small battery or super cap, instead of using an annoying non user replaceable battery?
Razor2048 But then the stealerships couldn't charge you $$$ to replace them. These days, many new auto technologies are designed to make it too expensive for small shops and amateurs to afford to repair them.
Razor2048 they have tyre pressure sensors that come with many modern cars that rely on ABS, and other telemetry to extrapolate the tyre pressure. just check out Indirect tyre pressure monitoring. en.wikipedia.org/wiki/Tire-pressure_monitoring_system#Indirect_TPMS
Ben's Wife: "Honey what are you doing?"
Ben: "Just building a tire simulator babe. I'll be in for dinner."
Ben's Wife: "Alright, See you in 10"
I have a feeling these types of conversations are common in his household (o:
I wrote the firmware for the system used by auto manufacturers to test and pair TPMS devices when they are installed at the factory, which is more complex since it needs to read units made by all of the major TPMS vendors. I can't comment on the specifics of the firmware, but I can answer questions about how the various TPMS systems work.
this is the best channel on youtube
*COUGH* 4 months haha :D
Can you get a new sensor chip and replace it to determine if the sensor itself will fix the problem? That would be interesting to know.
WOW. What an excellent video with details on every aspect I ever wanted to know. Thanks for this excellent video.
waaait a minute, didnt you use some of those pieces for the Hybrid rocket engine?
If this is an ad. it is the best ad ever seen:)
Does that tyre sensor law apply to all of the U.S or just certain states?
That was good information. It's exactly what I need to know. Thanks a lot.
Great informative video! Thank you. My car unknowingly did not come with a spare. It came with a mini compressor and a can of fix a flat. Just had a sidewall flat and had to have the car towed since this is useless on sidewalk flats. Never used that crap and never will. Going out and getting a spare.
Used this stuff once long ago on a car that had aluminum rims. Don't know if the products have improved or not, but I waited to get that tire fixed. Latter serious corrosion was seen on that rim. So bad that the new tire would not seal against the rim. It did get me back on the road and into work that day however.
As a refrigeration technician in Australia, we aren't allowed to release R-134a into the atmosphere due to its global warming potential. We face huge fines and maybe loss of our refrigerant handling licence if we're found to be releasing to the atmosphere in a negligent manner. How can a product like this, and others that I've seen (including a coil cleaner designed for the HVAC industry), be allowed to have such a substance which is tightly controlled in licensed industries? I want to say it's a kick in the guts to us who have to be careful with refrigerants, but more importantly it's a kick to the environment when we know that it's harmful to the climate and continue to put it in products that are freely released to atmosphere.
+Aaron Stein Yeah. It's good though. Keeps (most) backyarders from abusing refrigerant handling guidelines and also keeps the work within the industry.
+dan110024 Regs like that are often a question of mitigating what you can without worrying about the small-fries offenders. If a few thousand or tens of thousand DIY types vent a can or two of R134a every few years, that's one environmental load. If tens of millions of vehicles get their A/Cs recharged in a year and those commercial vendors vent all of it, that's a completely different ballgame. One is absolutely not worse or better than the other, but one application DOES have a much lower cost-per-impact ratio to regulate and enforce.
Of course, you're asking about fix-a-flat, which you COULD simply ban. My guess is nobody has because it's not something most people do to their tires on a weekly basis - the volume sold isn't great enough to have roused popular support for a ban.
+Aaron Stein Even in the U.S. you're supposed to have license to handle refrigerant commercially, but consumer use is largely unregulated.
+dan110024 ... You'd flip if you walked into WalMart then. You can buy a can of Air Conditioning refrigerant right off the shelf.
www.walmart.com/ip/AC-Pro-Professional-Formula-Refrigerant/20461354
because laws only apply to regular people that can be put in jail, companies make a lot of money so they can do whatever they what as long as they generate taxes, welcome to the civilized world.
In addition to latex some such compounds seem to have chopped up fibers as well. They help by forming a kind of mesh at the puncture point. Liquids leak through fibre "plug" until enough rubber has been formed. It can make a huge difference with bigger holes.
Wait, I didn't quite get that, Ben. How long did you say? You just happened to cough around when you said it.
edit: nvm, I understand now
3 pico seconds
Thanks Ben, well done again! Thought the gel stuff around the pwa & battery must be for G and centrifugal forces. It's a tough environment to think about the survival of an asic, mems & temp sensor and considerable challenge. Based on the consumer price it must be repaying the asic developers quite well. Also really enjoyed your chemical analysis and how it probably works!! The things we take for granted...Eh? Thanks much for what you bring forward. PJ
impressive guess work
The sensor may have an heavy current draw when it's reporting a failure. It's sitting at atmospheric pressure after all.
Alexandre Jasmin Yes, my thoughts exactly... the sensor *should* be screaming RF since there's no pressure differential. This is obviously not the failure mode... if I left my tire flat for three weeks I'd expect the TPMS battery to go bad anyway.
@@scowell I disagree, I think it would be awful design to have the thing report constantly when it's at low pressure. Once it's delivered the data to the car, it's completely unnecessary to continue to transmit when there's no change. The car is perfectly capable of storing the value and screaming on it's own.
@@Karreth I was thinking of first-gen TPMS... the newer ones are much smarter, and can give the pressure in each tire when queried. Thanks for your correction.
If it is latex i am surprised that they got away with not listing it on the MSDS.
Great video as always. Thank you.
You're probably right about the ammonia and latex. I have a container of liquid latex mold maker I bought some years ago at a hobby/crafts store, and it stinks very strongly of ammonia and looks just like what's in that beaker.
Next project: make a digital barometer from the pressure sensor!
Sensors aren't actually required by law, a TPMS (Tire Pressure Monitoring System) is required by law. It can be accomplished by sensors in each wheel which calculate individual tire pressures (as you mentioned) which is considered an "active" system, or it can also be accomplished through wheel speed sensors, known as a "passive" system.
over here in Europe it is required by law to have pressure monitoring an all cars sold after 2014 i think it was, active or passive where the passive just see if there is a difference in rotation speed of one wheel as if it is much lower pressure
Glad to hear we're alike in treating Fix-A-Flat like a permanent fix!
Awesome video! Extremely informative and valuable to know! Really enjoyed this video!
I wonder if it woudl be possible to soak-clean that sensor and repurpose it for monitoring pressure in another system.
4 months... all in the name of science, of course...
you are also supposed to fill it, drive for a minimum speed and time to cure it then pull over and deflate and re inflate the tire to get out most of the solvents.
But yes this is supposed just as a quick fix to give you some time before you must buy new tire.
I have changed a tire where something similar was used and it is a pain in the butt to remove all of it from the rim
Good stuff man!
Looking like a Mad Scientist there at the beginning!
knowledge is Power, thanks for the video .
I love your videos but to be honest I feel dumber after finishing one of them since I get about %50 of what you did/say but in this one I actually feel smarter since I learned something new with the chemical components and the DIY piston.
Interesting video and GREAT lab coat! Are you selling them?
I haven't had any problem with my TPM's after using. But if I did, I wouldn't take it to a dealer. The sensors can be bought on amazon for ~$10 or so and any tire shop can install them.
Always fascinating!
Did some work for CAS over the years, great group of folks!
Very interesting video, I had always wondered specifically how this works. Do you think the R-134 is responsible for the foaming effect?
For anyone wondering what the charred tube at the top left is from - Hybrid rocket engine with acrylic and gaseous oxygen :)
Good eye on the re-purposed rocket motor! Yes, I'll bet the boiling R-134 produces lots of gas bubbles and foam in the latex.
Applied Science I thought those milled aluminum blocks looked familiar.
The battery thing made me think. I'm not really into the subject but couldn't you replace the chip with a passiv RFID one?
I don't know how much power would be needed for the pressure sensor to work, though.
Nice analysis...I think you may live at 221B Baker Street? Some intelligent guess-timates that are convincing and educational Keep up the good work!
While you're correct in the damage to the TPMS the one thing you failed to mention is that once you use this stuff in your tire you can no longer patch said tire. The chemicals that penetrate into the rubber of the tire won't allow the glue, used in patching, to bond to the rubber. Thus, using one of these in your tire means your tire will have to be replaced if the temporary repair (check that can again, all of these cans state the repair is "temporary") doesn't last the life of the tire.
Very good. I keep a can of that in my trunk. I like this "science of everyday objects" theme.
Great video. Thank you.
Good video. I've would've never guessed that those contain refridgerant from legal/enviromental stand point. I've always thought inflation is based on some chemical reaction, like expanding foams used in constructions (don't know the english word for the substance).
R134a is probably used because it has a high liquid density at room temperature so I guess you'll achieve more pressure per volume than CO2.
Side note: If you condensed CO2 then it would be a solid so you might have trouble spraying it out of the can.
Rather then the battery, I would think the issue would be a piezoelectric element in the sensor. Piezo-electric elements can be chemically reactive. Many pressure sensors use piezo electric elements in pressure sensors.
Depending on the design, the battery might not actually be needed. If the circuit runs on Radio frequency, the circuit can demodulate a the radiowave to communicate with the circuitry and power the device. The battery would be a backup in that instance.
Damn, you know your stuff! Great video!
Where would you get a R-134a recharge kit in Canada? All I can find is RedTek 12a, which is engineered to be compatible with R-12 and R-134a systems, but I don't want to contaminate the system that I already have with something that isn't straight R-134a.i
I also don't want to spend the money getting it fixed (if I can avoid it), because they will be required to drain the system, perform a vacuum check, etc, that will drive up the cost.
golly! great job and i mean that! good good good information. thank you! kudos
What are the directions on the can? I don't see any way this could work if the puncture is at the top of the wheel, or the opposite side of the valve stem. Do you need to rotate the wheel after applying this product?
if you ever have the option of NOT using Fix-a-flat, do so, that stuff will rust/corode your wheels and destroy your valve stems as well as the affor mentioned pressure sensors
Really intersesting; good detection.
Thanks for this very interesting video !
All these chemicals work together not only to fix the puncture but also to destroy the tire. Tires are easily damaged chemically by solvents and uncured rubber. So, if you use one of these cans to fix a puncture, no decent technician is going to repair the tire afterwards. It's far better to have a small compressor in your trunk.
There are several reasons not to use this stuff it can etch your wheels i have seen it make its way between the aluminium and chrome and cause real problems. It can make a small out of balance problem a big out of balance problem. I have also had patches not hold in tires with fix a flat.
Never had a time using Fix-a-flat that didn't turn out as a bad idea.
Not too often term solutions don't become a greater problem downstream. Panic is the true mother of necessity.
Great video, very informative and fun
Wouldn't they have to put latex on the MSDS because latex is an allergen?
Another reason to clean it out promptly is if you leave it in a steel rim wheel for a long period, the ammonia will first dissolve the paint inside the wheel and then rust the hell out of the inside of the rim completely. When you then dismount the tire, the part of the rim where the tire seats its bead will be so rusted out that the rim will have to be scrapped and another one bought. Not sure what would happen with an aluminum rim but I certainly wouldn't take a chance either way and get that stuff totally washed out from inside my wheel ASAP!
Could the ammonia have shorted the battery directly?
If I had to guess, the aromatic hydrocarbons could have seeped into the sensor and even in an evaporated state, or liquid for that matter, leached into that rubbery potting material and damaged the components and running the battery dead in short order.Those kinds of solvent liquids like naptha really soak into soft materials pretty well. Loved the, "left the sealant in for.....(cough)......4 months", lol I had a good laugh at that!
For what its worth, I prefer to carry a Slime kit for emergency flat tires. It works very well and less nasty to the tire/components. The little compressor takes forever but it works and can get full inflation. The stuff in a can is hazardous to the tire tech too, risk of fire/explosion.
Have heard that this stuff might throw your wheel off balance, so using it should be strictly temporal. Never used it myself because of the following clean up.
Latex based sealants will do that as the latex dries it forms balls in the tyre and - so not evenly distributed when liquid. Vibration follows...... Its OK if you use it as a temporary fix. But even then its gonna piss off the tyre shop. Better for them to sell you a new tyre......
How would you clean that stuff out of the tire anyway?
My guess is that the tps starts seeing less than nominal pressure and starts wirelessly transmitting - it doesn't go to sleep because the tire is 'flat' in normal atmosphere.
The sensor diaphragm is getting gunked while the tire is flat, then pressurized so the gunk prevents the sensor ever seeing real pressure again; battery dead.
Could the sensor be drawing so much current since there's obviously a fault?
It might not be sleeping properly because it's not under "tire" pressure, for that sensor 1 atmosphere is a critical condition, so it might make sense for it to panic...
This is trivial to test, just do the same test under pressure and if it sleeps correctly then the problem is not that.
I had exactly the same thought - if I were designing a remote pressure sensor then I'd have it increase its wakeup rate during exceptional conditions to ensure that any communications losses were overcome and that it could promptly detect a return to normality.
does food coloring mix with it? 🤔🤗
Great vid. Cool rig🖒
Great video! Thanks for sharing.
weird, never knew they had these types of tire guages. then again i dont know many people with a car younger than 10 years.
Aren't there any fix a flat tire sensor safe?
Thanks great video
Disregarding flammability, couldn't you just use Butane/Propane instead of the refrigerant gas?