Mr Cartool L202/302 Serious Shortcoming
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- Опубліковано 24 лис 2024
- There is no denying Charles’s Law but it renders the leak check function (why I bought it) useless.
The setup was allowed approximately 20 minutes of “stabilization” time prior to commencing with the leak (tightness) test.
The initial tool assessment video had been removed.
bad information is worse than no information
Exactly David. NFG ! Cheers Pal 👍
Are you aware that the compressor oil will always retain some refrigerant which will be released as temperature increases ? So it is perfectly understandable that is part of your issue.
Also, you were expecting way too much from a low cost manifold. You will never get top dollar performance for what you paid.
And besides, that is why UV dyes and electronic leak detectors were invented. I leak checked tons of cars while attending an HVAC course several years ago, so I've been there and pulled my hair out too.
If it takes a month to crap out, don't expect to gauge it in a couple of hours, bubbles or not.
A 12 to 24 hr leak check would be more realistic, so don't shift all the blame onto the manifold. Temp comped or not, no gauge is totally fool proof.
Nice video, thou. Thanks and keep up the good work.
True. Guess you can only expect so much from low cost tooling. I repeated the test with a Testo 550. But to your point the 550 was 3 1/2 times the price. Thx for watching 🍻
So did the testo give the same readings as this gauge? I mean is this gauge faulty or there was a leak somewhere?
If you search for a nitrogen / pressure calculator you can use it in a similar way to the Fieldpiece algorithm. Just put a temp probe on a refrigerant line and try and control the testing conditions the best you can. eg engine cold and out of direct sunlight. 😁👍. I tried to put a link up but it kept getting deleted ☹️
Thanks Iain. I will certainly look into that. I figured a formula for correction must exist. But with small losses (1/10 of 1 psi) I am not sure how practical it will be. I certainly will look into it. Thx for all your help, it’s greatly appreciated. 👍
It makes me feel better on the £600 that Fieldpiece took from me , it a shame but thanks for the heads up mate 👍
You bought a professional grade tool Igor. You can bank on it. Cheers Pal 👍
That's too bad, annoying when you get a tool to do a job only to find out that it didn't do what you wanted it to do, thanks for the update mate.
There is a formula for correction in temperature shift Matt. Not sure how practical it will be with such tiny numbers…We’ll see. Cheers Matt 👍
I was thinking if the hoses inflated with the pressure a little then in time closed in again to show a slight increase in pressure, and then so temp change on top of that. I'm no air con expect though. Cheers Matt
@@mechanicmatt871 Yes there is a few variables at play Matt. I waited 20 minutes to allow all elements to “stabilize” before starting the leak check. Line stretch is a definite consideration. Charles’s Law tells us pressure will change in direct relation to temperature. Working within a shop at an absolute fixed temperature is not gonna happen…So considerations for that must be made…Not sure if you saw the Post I put up earlier, Thx to Iain. This helps to some degree. Thx for taking the time to give the issue some thought. 👍 PS: In all honesty with leaks this tiny, I am not sure leak down testing is practical.
Amigo ..No es que no sirva el manometro digital...es que la temperatura que tenías en el circuito era superior a la pérdida de vacío ..es por eso que en un momento subía la presión... cómo vas hacer una medición de vacío con temperatura...
LA MANGUERA ESTA MAL PUESTA , VA EN EL OTRO CONECTOR
I don’t speak Spanish however. The ports are in reality reversed from the detail in the manual. I addressed this in a previous video.
El sensor está colocado en el lado contrario que indica el manual
you're right, the sensor is located on the opposite side of the manual
@thegibby3340 thanks for this info
Thx for watching 🍻
Okay te explico. Yo tengo la misma ramienta y trabajo con manómetro digital. Por lo tanto cuando trabajo Manuel manómetros digitales son muy sensibles. 🔥 Acuérdate que el nitrógeno se meten un carro de entre 5 a 10 minutos nomás de allí porque está hecho de aluminio y la manguera la manguera se expande haciendo así que tu nivel de presión realmente allá para variantes en la lectura y la lectura del manómetro ya que son muy precisos que son muy sensibles. Yo yo como tú harina prueba Agar una bombona de gas que esté vacía verificó que no tenga ningún tipo fuga y métele presión con nitrógeno y ahí te das cuenta después de 45 minutos una hora la variación que va a tener pon número numerología digital. Esto manómetros digitales para los técnicos nosotros dueños de talleres en un doble sí lo debido a que sigue variando la aguja suponemos que hay una fuga de digas ya que son muy sensibles y los relojes analógicos simply a la mente o de aguja simple a la mente para que pueda bajar una una libra es casi imperceptible a la vista. Y digitalmente la bruja si va a ser va a ser mucho más notable cualquier tipo de anomalía que el sistema tenga. yo lo máximo que dijo en un carro la presión son de 5 a 10 minutos más de allí no. Portando normativa de planta normalmente se hace de esa manera. Más cuando el sistema ya tiene tiempo en el carro cuando yo cambió todo el sistema y los colocó nuevo sistema nuevo máximo lo dejó 15 minutos depresión con nitrógeno y no le meto 100 libras le meto 250 a 300 libras de presión. En carro pequeño y si son camionetas o suv urban le colocó 350 400 libras. .
I hate it when I purchase an item and then do the reviews!!
Duly noted. Thanks brother.
Hi Mark. I know you were interested in this tool from my initial assessment. I hope I haven’t caused any grief.
@@TheGibby3340 not at all my friend. As it happens I've been up to ears in getting power to my new shop so other interests have been on hold. This winter I'm hoping to take an online class on AC so maybe I'll come across something I can help you with for a change. I still think there is some value to that unit but it may not be enough to justify buying. We shall see my friend. I'm confident that brain of yours will come up with another interesting approach. Thanks for asking though. 👍
@@mfsperring Cheer Mark 👍
I hate it when I purchase an item and then do a product review....
Dammmmm wasn't expecting that....
One of the factors making this an $85 tool. The Fieldpiece mentioned is around $500 Canadian. Same old Johnny…You get what you pay for (If yer lucky 🍀) Cheers Pal
@@TheGibby3340 yeah mate I hear ya....
Question
1: The car was drove it in and it had a hot engine or at least pretty warm.
Of course you vacuumed out so there’s no trace of refrigerant to expand first.
Your tank of nitrogen is that your ambient temperature of your shop if it’s early morning may be a few degrees cooler because of its mass of metal.
So let’s say you inject 18°C nitrogen into an automobile 48°C and you start your test.
When it’ll take a little while as the nitrogen in all the lines including the evaporator and the compressor start to heat up and do a little bit of expansion because nitrogen does not expand a lot but it still expands. .
2: I seen the bubbles but were those created by the squirting action because in the video I did not see formation of new bubbles were they would slowly be gathering and building up.
What is the new bubble development so slow during the short period of time it was on video it did not develop a new bubble to expand to be seen ?
3: test your equipment in your house if you have a good furnace that keeps your house at a steady temperature like to use 21°C overnight on a 13.6 kg charging cylinder that was vacuumed out clean and then filled with nitrogen for your test.
Now re-perform your test for a few hours as long as the room temperature doesn’t change your cylinder doesn’t change temperature your pressure should stay exactly the same give a margin of error of maybe couple of kilopascals.
Equivalent to two or 3/10 of a psi for that weird country that it’s citizen still Use that neanderthal psi and pounds and measurements in 3/16 of an inch and 12 inches is a foot.
Ok thx Tom. Much appreciated. I will add this to my never ending list of things to consider 🤣 Cheers 👍
BTW the car had been in the garage for days. I allowed 20 minutes line relax line prior to leak test commencement.
And the bubbles had newly formed where the leak (better bubble) detection fluid was applied. Sorry about the partitioned answers.