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Thread: Vacuum gauge on 3/16 natural vacuum

  1. #1
    Join Date
    Apr 2017
    Location
    Westford, VT
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    Default Vacuum gauge on 3/16 natural vacuum

    I just set up my line to ncluding the vacuum gauge at the highest point. Is it ok to leave the gauge permanently installled, or is it typical to only install it to check the vacuum, and then remove it?
    2014-2017 - 3 taps - open fire boil
    2018 - 33 taps on 3/16 20" Hg, 3 buckets, barrel evaporator, RO Bucket
    2019 - 41 taps on 3/16" 20" Hg, 4 buckets, barrel evaporator, RO-Bucket Kit (3x400 gpd)

  2. #2
    Join Date
    May 2009
    Location
    UVM Proctor Maple Research Center, Underhill Ctr, VT
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    6,391

    Default

    Quote Originally Posted by MDR Maple View Post
    Is it ok to leave the gauge permanently installled, or is it typical to only install it to check the vacuum, and then remove it?
    On a 3/16" system you should leave it permanently installed. If you open the tubing system to put the gauge on the line, it'll suck air in and you'll get an incorrect reading (less vacuum) until it stabilizes again, which could take a while. Alternatively, you could have a gauge and a tee/valve setup so very little air wouldn't be pulled in, but that would end up costing a good bit more and still not give the best reading.

    Keep in mind though that these gauges aren't typically meant to be used outside, so putting the gauge in tightly sealed plastic baggie after it is installed will preserve its lifespan a good bit.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

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