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Thread: controller or PM2 connector for temp probe

  1. #1
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    controller or PM2 connector for temp probe

    Recently upgraded from a classic to an EL - and re-used my PM2 with the EL.

    Is there any advantage of running two temp probes (one connected to the PM2 and one connected to the EL)? If I only use one - which should I connect to - the PM2 or the EL. I also have the salinity probe (connected to the PM2).

    Thanks!

  2. #2
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    There is benefit to using multiple probes particularly if you have a combination of in tank (or in overflow) and in sump heaters to provide redundancy in the event of a return pump failure. It can be very useful to have knowledge of both tank and sump temperature.

    If you choose to only use 1 temp probe, it needs to go in the PM2. Regardless of whether you use 1 or 2 temp probes, the temp probe plugged into the PM2 should be located as close as possible to the cond probe, preferably within a few inches of it so that temp compensation can be as accurate as possible.

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  3. #3
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    Thanks - I use the Neptune 4-probe rack in my sump - currently with salinity, temp and pH. I pulled my ORP from my base classic setup when I installed the EL.

    Now that I have 2 temp probes (original and the one that came wiht the EL) - I might set up the 2nd one in one of the overflows in the DT.

    If I do that - thoughts on whether or not the PM2 or head unit should be in the fuge (where the salinity probe is at)?

    Thanks!

  4. #4
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    Quote Originally Posted by Detour View Post
    Thanks - I use the Neptune 4-probe rack in my sump - currently with salinity, temp and pH. I pulled my ORP from my base classic setup when I installed the EL.

    Now that I have 2 temp probes (original and the one that came wiht the EL) - I might set up the 2nd one in one of the overflows in the DT.

    If I do that - thoughts on whether or not the PM2 or head unit should be in the fuge (where the salinity probe is at)?

    Thanks!
    The PM2 temp probe should be in the sump next to the cond probe. And for the heaters I like to do this.

    Sump heaters run based on the overflow temp probe when the return is on and the sump temp probe when the return is off or if the overflow probe is obviously wrong (like readings less than 70 or over 90).

    Tank/overflow heaters run off the sump temp probe when the return is on and the overflow temp probe when the return is off or if the sump temp probe is obviously wrong.

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  5. #5
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    Thanks Zombie -

    Do you have an example of the code you use for the sump heaters that behave one way using the overflow temp when return pump is on, and another way using the sump temp when the return pump is off?

  6. #6
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    Quote Originally Posted by Detour View Post
    Thanks Zombie -

    Do you have an example of the code you use for the sump heaters that behave one way using the overflow temp when return pump is on, and another way using the sump temp when the return pump is off?
    Like this

    TankHeatNor (VO)
    If SmpTmp < 77.8 Then ON
    If Output Return = OFF Then OFF
    If SmpTmp > 78.0 Then OFF

    TankHeatPrb (VO)
    If TnkTmp < 77.8 Then ON
    If Output Return = ON Then OFF
    If TnkTmp > 78.0 Then OFF

    SumpHeatNor (VO)
    If TnkTmp < 78.0 Then ON
    If Output Return = OFF Then OFF
    If TnkTmp > 78.2 Then OFF

    SumpHeatPrb (VO)
    If SmpTmp < 78.0 Then ON
    If Output Return = ON Then OFF
    If SmpTmp > 78.2 Then OFF

    TankHeater
    Fallback ON
    Set OFF
    If Output TankHeatNor = ON Then ON
    If Output TankHeatPrb = ON Then ON

    SumpHeater
    Fallback OFF
    Set OFF
    If Output SumpHeatNor = ON Then ON
    If Output SumpHeatPrb = ON Then ON
    If SmpTmp < 70.0 Then OFF


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  7. #7
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    When connecting the temperature probe to the PM2 unit can it still be used to control the chiller?

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