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Thread: PM2 temperature compensation?

  1. #1
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    PM2 temperature compensation?

    I just set up my new PM2 Everything is working firmware up dated both probes calibrated
    now in the temperature compensation is saids select the temperature compensation in %/c, press OK
    ok but what value goes in there?

    thanks

  2. #2
    Master Control Freak RussM's Avatar
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    From the PM2 manual: Seawater typically has a temperature correction factor of 2.1 to
    2.3 %/C

    2.2 is a good staring point. You maybe end to adjust it a bit, but start there.
    Please do not send me PMs with technical questions or requesting assistance - use the forums for Apex help. PM me ONLY if the matter is of a private or personal nature. Thanks.

  3. #3
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    that is what I did
    why will I change it?
    Thanks

  4. #4
    Master Control Freak RussM's Avatar
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    If you find that it's over- or under-compensating.
    Please do not send me PMs with technical questions or requesting assistance - use the forums for Apex help. PM me ONLY if the matter is of a private or personal nature. Thanks.

  5. #5
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    ok but how do I know if it is over or under compensating

  6. #6
    Frequent Contributor jrlamountain's Avatar
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    Test the tanks salinity with a refractometet and see I'd it matches your probes number

    Sent from my SCH-I535 using Tapatalk 4

  7. #7
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    that make sense thanks

  8. #8
    Master Control Freak RussM's Avatar
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    Quote Originally Posted by jrizo1 View Post
    that make sense thanks
    Except that the response given doesn't correctly answer your question. Temp compensation, if set properly, will result in little to no variation in the salinity reading in relation to a temp change. If you see the salinity reading changing along with temperature, then the temp comp value is not right and needs to be adjusted up or down accordingly.

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    Does it need a temp probe connected? I thought it did

  10. #10
    Master Control Freak RussM's Avatar
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    Quote Originally Posted by Rudimenta View Post
    Does it need a temp probe connected? I thought it did
    Yes, in order to use temp comp, a temp probe must be connected to the PM2

  11. #11
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    Quote Originally Posted by RussM View Post
    Yes, in order to use temp comp, a temp probe must be connected to the PM2
    Say I have a PM2 and want to use temp compensation. Can I just use the temp probe on the main unit on the PM2 instead or is there a reason I should leave the temp on the base unit and get another temp probe for the pm2?

  12. #12
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    Only works with temp probe connected

    My next oversea order will include another temp probe, as I rather keep the one I have to the main unit

  13. #13
    Master Control Freak aquamanic's Avatar
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    You can use your temp probe from the controller but you have to move it to the PM2. That's the only way the PM2 will recognize it for temp comp. Remember when you do that the temp probe name will change. Regardless of where the temp probe is connected, you can still use it to control your heater and chiller. So there's really no downside to having it connected to the PM2 instead of controller.
    Al

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    Comprehensive Reference Manual can be found here.

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    Well the downside is that the PH can not be linked to temp anymore if I am not mistaken

  15. #15
    Master Control Freak aquamanic's Avatar
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    Doing temp compensation on pH is totally worthless IMO. The difference in pH between say 79 and 81 takes you out 3 decimal places...well beyond the accuracy of these probes.
    Al

    I do not work for Neptune. Please do not send me PMs with technical questions or requesting assistance - use the forums!
    For Neptune support send an email (don't call) to: [email protected] .
    Manuals for all products including the
    Comprehensive Reference Manual can be found here.

  16. #16
    Frequent Contributor iamchadster's Avatar
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    Quote Originally Posted by RussM View Post
    Except that the response given doesn't correctly answer your question. Temp compensation, if set properly, will result in little to no variation in the salinity reading in relation to a temp change. If you see the salinity reading changing along with temperature, then the temp comp value is not right and needs to be adjusted up or down accordingly.
    So I see my ppt changing slightly with temp. 32.8 to 32.2 so how is the compensation done. In other words do you increase the compensation in a particular direction based on how the ppt changes etc. I understand the chemistry of why ppt changes but how does it relate to the compensation value set in the probe menu?
    e
    Last edited by iamchadster; 02-28-2014 at 22:09.
    Chad

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    Quote Originally Posted by iamchadster View Post
    So I see my ppt changing slightly with temp. 32.8 to 32.2 so how is the compensation done. In other words do you increase the compensation in a particular direction based on how the ppt changes etc. I understand the chemistry of why ppt changes but how does it relate to the compensation value set in the probe menu?
    e

    I know this is an old thread, but Id love to know the answer to this!

  18. #18
    Frequent Contributor iamchadster's Avatar
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    Quote Originally Posted by willtheld View Post
    I know this is an old thread, but Id love to know the answer to this!
    That was more than a year ago. LOL. If the PPT change too much with temp swing, then the compensation isn't adequate. I've played with it a bit and increased the compensation to decrease the variation and have found that 2.2 really works pretty well.
    Chad

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    Quote Originally Posted by iamchadster View Post
    That was more than a year ago. LOL. If the PPT change too much with temp swing, then the compensation isn't adequate. I've played with it a bit and increased the compensation to decrease the variation and have found that 2.2 really works pretty well.
    I am in Australia and just wondering if the 2.2 temp compensation is still appropriate for Celsius over Fahrenheit, or would I need to make an adjustment to say 1.1?

  20. #20
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    Quote Originally Posted by dspiteri View Post
    I am in Australia and just wondering if the 2.2 temp compensation is still appropriate for Celsius over Fahrenheit, or would I need to make an adjustment to say 1.1?
    I to am from Australia and want to know if the 2.2 applies to Celcius or just F

  21. #21
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    Quote Originally Posted by claverjg View Post
    I to am from Australia and want to know if the 2.2 applies to Celcius or just F
    The value is independent of C or F setting. It's full description is 2.2 ppt/C and those using F will have it automatically adjusted for them.

    You might be an engineer if...You have no life and can prove it mathematically.

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