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  1. #1
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,121

    Sman micron gauge

    While I am fully aware of the advantages of evac through an isolated system (not through your manifold), I was wondering what you guys think of the micron gauge built into the manifold. Does it seem accurate? Reliable? Do you think the sman4 is worth the extra money if doing evac through your manifold versus the 3?
    ...

  2. #2
    Oh boy ..here comes another debate with JP....

    Firstly, you are right when you say an isolated hook up is best...but if your manifold is tight and leak free and you use vacuum rated hoses ..go ahead and use a manifold. It's your time...it just takes longer. But don't rely on the built-in micron gauge of any digital...none of them are as good as using a dedicated micron gauge.

    Sman4 is a good manifold if you want to evac a system. So is Testo ....alot of guys like DigiDrools...sorry that's Digicool.

    The SMAN 4 is worth the extra money because it is a dedicated evacuation manifold and has a lot of features.

    Now let the fun begin.

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,547
    Manifolds have many places to leak, making it quite difficult to ensure 100% leak free.

    Minimize the number of potential leaks.

    If an SMAN is all ya got, it'll do, but we all know what the proper way to do it is.

    Manifolds or, more precisely, the 1/4" hoses are also much more restrictive.

    This increases evacuation times.


    So, if you've got time to waste (I know I don't), enjoy the somewhat masochistic task of trying to ensure that all of the seals, gaskets and such on a manifold are tight and have the extra cash to buy a second micron gauge as suggested, I say go for it.

  4. #4
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
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    6,650
    kangaroogod You may want to consider the difference in maintenance/cleaning of one that is built in vs a stand alone since you are basically scrubbing down the manifold and connection as well as the sensor. You need to use much more cleaner more frequently with one that is built in and it takes more time. It seems like a consensus of guys with them and post here possibly bought one thinking it was a good idea but now say I wouldn't buy one if you wanted to use the micron gauge effectively in the field. IMO the wireless in the 4 makes the 3 obsolete. The choices from Fieldpiece IMO would be a 2 or 4
    To answer your question to me they do not seem accurate or reliable.
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  5. #5
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,121
    Thanks for the replies.. I didn't think about the 2 option. I am setting up 8 techs with tools and wanted to spend their money wisely. I'm thinking sman2 and bluevac,, thanks
    ...

  6. #6
    Quote Originally Posted by jpsmith1cm View Post
    Manifolds have many places to leak, making it quite difficult to ensure 100% leak free.

    Minimize the number of potential leaks.

    If an SMAN is all ya got, it'll do, but we all know what the proper way to do it is.

    Manifolds or, more precisely, the 1/4" hoses are also much more restrictive.

    This increases evacuation times.


    So, if you've got time to waste (I know I don't), enjoy the somewhat masochistic task of trying to ensure that all of the seals, gaskets and such on a manifold are tight and have the extra cash to buy a second micron gauge as suggested, I say go for it.
    Thank you Dr, Phil

  7. #7
    Quote Originally Posted by kangaroogod View Post
    Thanks for the replies.. I didn't think about the 2 option. I am setting up 8 techs with tools and wanted to spend their money wisely. I'm thinking sman2 and bluevac,, thanks
    Might be better off with Testo 550. They don't need to calibrated before each use to guarantee accurate SH and SC reading.

    Don't get me wrong, but the guys who own the Sman products will (or at least should ) calibrate their SMAN before each use. This is just the price of ownership of an SMAN product. I own SMAN 3 and 4 and (also TEsTO 570 and 557 kits) find the speed of the SC and SH is worth the extra amount of time it takes to calibrate them.

    How ever, in the hands of a hired tech you may find some reluctance to go thru the calibration process with each use.

    Testo 550 price is about the same as Sman 2.

  8. #8
    Quote Originally Posted by itsiceman View Post
    kangaroogod You may want to consider the difference in maintenance/cleaning of one that is built in vs a stand alone since you are basically scrubbing down the manifold and connection as well as the sensor. You need to use much more cleaner more frequently with one that is built in and it takes more time. It seems like a consensus of guys with them and post here possibly bought one thinking it was a good idea but now say I wouldn't buy one if you wanted to use the micron gauge effectively in the field. IMO the wireless in the 4 makes the 3 obsolete. The choices from Fieldpiece IMO would be a 2 or 4
    To answer your question to me they do not seem accurate or reliable.
    Did you calibrate them?

  9. #9
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    1,753
    I have an SMAN3 but I never use the vacuum gauge on it. The refrigeration hoses are not reliable because of their off-gassing and permeability and the ball valve ends.
    I use a Bluevac with Appion TEZ8 and Appion vacuum hoses (3/8") for evacuation. Also some Nylog for the connections. This has almost completely eliminated any problems and speeds the process.

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,547
    Quote Originally Posted by hvac5646 View Post

    Might be better off with Testo 550. They don't need to calibrated before each use to guarantee accurate SH and SC reading.

    Don't get me wrong, but the guys who own the Sman products will (or at least should ) calibrate their SMAN before each use. This is just the price of ownership of an SMAN product. I own SMAN 3 and 4 and (also TEsTO 570 and 557 kits) find the speed of the SC and SH is worth the extra amount of time it takes to calibrate them.

    How ever, in the hands of a hired tech you may find some reluctance to go thru the calibration process with each use.

    Testo 550 price is about the same as Sman 2.
    This is precisely why I'm clearing k-type thermocouples out of the truck.

    Ain't nobody got time for that...

    Especially when the technology to operate without having to calibrate sensors is so readily available.

  11. #11
    Quote Originally Posted by jpsmith1cm View Post
    This is precisely why I'm clearing k-type thermocouples out of the truck.

    Ain't nobody got time for that...

    Especially when the technology to operate without having to calibrate sensors is so readily available.
    Just a matter of what u like I guess,

    I can calibrate my Sman in no time. Just used to it.

    I use my Testo too..with the amp clamp and the air probe and the printer.

  12. #12
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
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    6,650
    Quote Originally Posted by kangaroogod View Post
    Thanks for the replies.. I didn't think about the 2 option. I am setting up 8 techs with tools and wanted to spend their money wisely. I'm thinking sman2 and bluevac,, thanks
    Digi-Cool AK-900 and BluVac would be the wisest money spent IMO
    “If You Can Dodge A Wrench You Can Dodge A Ball”

  13. #13
    Quote Originally Posted by itsiceman View Post
    Digi-Cool AK-900 and BluVac would be the wisest money spent IMO
    Why is it better? Even excluding the micron gauge The 570 and sman 4 do more than the DC.

    I don't see an elderly gent beating on an empty plastic case as a motivation to buy.

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