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  1. #1
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    F61 Penn flow switch range adjustment at site



    Need a help:
    Penn make F61-TB-9100 model flow switch has a range adjustment screw at the top near the electrical terminals. The adjustment screw is very small size, kept inside a bronze nut or socket.
    How do I adjust the setting? Use a wrench on the bronze nut or a mini-screw driver to turn the small screw inside?
    I tried both. The spring below seems to move. But want to do it the right way. Has anyone adjusted the setting for this model flow switch at site? What is the right way to do it?
    Thanks for your help!



  2. #2
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    Re: F61 Penn flow switch range adjustment at site

    Should be easy to turn, big screwdriver slot I think.
    Restrict flow to minimum required, then adjust to open circuit flow switch.
    Then double check again to be sure.

    https://be-ebusiness.eu.johnsoncontr...140E55BE794B0A
    Last edited by RANGER1; 16-11-2017 at 07:07 AM.

  3. #3
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    Re: F61 Penn flow switch range adjustment at site

    I would also determine if the flow rate was correct for the machine before carrying out any adjustments
    I'm back on the Pale

  4. #4
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    Re: F61 Penn flow switch range adjustment at site

    Penn F61.png
    Spot on Frank!
    These switches operate at such low flow rates, that the adjustment left is tiny!
    The factory minimum flow settings are very low.

    If adjustment is due to poor flow then there is very little left to adjust.
    Good Luck all the same K.R.Iyer.
    Grizzly
    Despite the High Cost of Living it still remains Popular!

  5. #5
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    Re: F61 Penn flow switch range adjustment at site

    Sensitivity is also adjusted by number of paddles, how big pipe is, length of paddle, restriction in pipe from paddle.
    Attention to paddle getting hung up on something internal.
    To me old technology, electronic more adjustable & reliable, little bit more expensive.
    If critical & know minimum flow rate, hire a flow meter to calibrate it.

  6. #6
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    Re: F61 Penn flow switch range adjustment at site

    Some good and valid points Ranger.
    The flow of the medium through the Chiller is so important.
    But also in some instances the most ignored.
    Most new installs I go to don't even have Binder points to be able to measure the flow
    Grizzly
    Despite the High Cost of Living it still remains Popular!

  7. #7
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    Re: F61 Penn flow switch range adjustment at site

    Quote Originally Posted by K.R.Iyer View Post
    Need a help:
    Penn make F61-TB-9100 model flow switch has a range adjustment screw at the top near the electrical terminals. The adjustment screw is very small size, kept inside a bronze nut or socket.
    How do I adjust the setting? Use a wrench on the bronze nut or a mini-screw driver to turn the small screw inside?
    I tried both. The spring below seems to move. But want to do it the right way. Has anyone adjusted the setting for this model flow switch at site? What is the right way to do it?
    Thanks for your help!
    The Penn flow switch is delivered with minimum flow adjusted, this is said in the user manual that comes with the flow switch, as well as in the manual that RANGER1 posted.


    HOWEVER, the nut with the tiny screw inside is almost impossible to adjust, and it feels like you are going to break it when you try.

    adjusting the spring tension can be done by using an adjustable spanner on the nut, or a tiny screwdriver on the screw inside the nut.

    But you have to use a adjustable spanner or a wrench that fits, on the hexagon nut first to really wriggle it loose first, when you have applied enough force to think "Nah... I'm gonna break something" you are using half the force needed.

    The Penn F61 is a *piece of something" and it has a reputation as a flow switch, because once you have flow it switches to not working....

    I have used all range of stainless steel paddled that come with them , or even replaced the stainless steel paddles with home made paddles made from the soft sides from a plastic oil canister... the only difference is that fitted with the home made paddle, it worked about a month before it started leaking internally and short circuited the entire control panel...
    -Cheers-

    Tycho

  8. #8
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    Re: F61 Penn flow switch range adjustment at site

    Same as the johnson control ones, had a few sites where quarterly maintenance the small screw had to be tweaked to get it to go off, i prefer dual pressure ones.
    Mostly found in the southern part of this green and pleasant land.

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    Re: F61 Penn flow switch range adjustment at site

    Thanks for all the useful insights from all of you! A big benefit of this forum.

    In this site I was called upon, the switch was mounted on a manifold and I could not ascertain the flow shape inside (circular or square). It was not responding to higher flow than rating (reference: its rating catalog).
    The original switch had only a single paddle, that too slightly bent in flow direction. I replaced it with a new one, increasing its length (compared to old one) and keeping 5 mm gap at bottom. Also added another two small paddles behind the new long paddle, for reinforcement.
    it worked now - on increase of flow. Made minor flow setting adjustment as needed by customer, Checked 3 times for cut-off and cut-in. It worked well.
    Thanks once again!

  10. #10
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    Re: F61 Penn flow switch range adjustment at site

    We've stopped using the Penn flow switch and have started using this one, with no moving parts.

    https://www.pctflow.com/our-products...ow-controller/
    -Cheers-

    Tycho

  11. #11
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    Re: F61 Penn flow switch range adjustment at site

    Quote Originally Posted by Tycho View Post
    We've stopped using the Penn flow switch and have started using this one, with no moving parts.

    https://www.pctflow.com/our-products...ow-controller/

    Had a look at this product. Thanks!

  12. #12
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    Re: F61 Penn flow switch range adjustment at site

    They are a little expensive, but worth it.
    You can adjust scaling on some & also see if/when flow drops off.

  13. #13
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    Re: F61 Penn flow switch range adjustment at site

    Quote Originally Posted by RANGER1 View Post
    They are a little expensive, but worth it.
    You can adjust scaling on some & also see if/when flow drops off.
    it'll be a one time higher cost, instead of many slightly smaller as the Penn switches die after 3 months

    We've only used the ones with switches inside, but the also come with 4-20 mA output for flow reading.
    -Cheers-

    Tycho

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