KH Guardian: Automatic Alkalinity Controller- My Experiences

Discussion in 'Reef Aquarium Discussion' started by Rick.45cal, Feb 3, 2017.

  1. ihavecrabs

    ihavecrabs Valuable Member R2R Supporter R2R Excellence Award Reef Squad Partner Member 2019 Article Contributor Build Thread Contributor

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    I have ordered some potassium chloride and some calibration fluid as well as a secondary probe. I'll clean the existing one, store it, and see if the new one solves the issue and then begin cycling them.
     

  2. lnevo

    lnevo Active Member

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    Past few days have been up and down regarding volatility. However, I do have a lot going on in my tank and I've really just started using the Guardian. My pH calibration fluid finally came in on Friday so I redid that. After that my readings were much higher (I expected them to be lower, but oh well, no biggie). I realized later that the ph probe was not in the right position. Fixed that, readings went down. Everything was reading well today, except for one way off reading at 2:30 in the AM. Then this afternoon I get a PW<_ERR. I tried to purge again and it didn't help (but didn't try holding button 4 to reset). Anyway, I rebooted a few times, tried the purge again. Same thing. I then tried to do a SW De-Gas which ended up in a SW>_ERR. Took the chamber apart, float switch is ok. I did the FWON and re-calibrated the level sensor. After finally doing RESET button, I have a good reading again.

    Code:
     12/29 01:34:01 W.146 %0 KH :8.97
      12/29 03:53:10 W.143 %0 KH :8.97
      12/29 06:05:03 W.143 %0 KH :9.39
      12/29 08:17:02 W.148 %0 KH :9.00
      12/29 10:37:24 W.144 %0 KH :9.14
      12/29 12:56:57 W.145 %0 KH :9.01
      12/29 15:08:57 W.146 %0 KH :9.39
    --- calibrated ph probe here ---
      12/29 16:33:06 W.139 %0 AK. 0.00 KH :8.42
      12/29 18:46:26 W.140 %0 KH :8.70
      12/29 21:05:21 W.141 %0 KH :8.56
      12/29 22:13:23 W.140 %0 KH :8.60
      12/30 00:24:56 W.140 %0 KH :8.55
      12/30 02:35:57 W.136 %0 KH :8.18 - one way off reading
      12/30 04:47:27 W.136 %0 KH :8.55
      12/30 07:06:13 W.137 %0 KH :8.42
      12/30 09:25:15 W.142 %0 KH :8.50
      12/30 11:44:18 W.136 %0 KH :8.45
      12/30 14:03:16 W.137 %0 KH :8.45
      12/30 16:05:04 PW
      12/30 16:05:04 W.0 KS=0D L%0 S%0 PW<_ERR KH :0.00
      12/30 17:08:57 W.176 KS=0D L%0 S%0 SW>_ERR KH :0.00
      12/30 17:15:35 RESET !
    --- calibrated level sensor here ---
      12/30 17:34:01 W.142 %0 KH :8.81
      12/30 18:43:18 W.139 %0 KH :9.13
    
    For the record, my alk is not yet stable at all. I've been working on increasing it (iDip and Hanna both read much lower than KHG) and have been working on adjusting my daily dosing. I think I'm close but need more data to figure out. For anyone who is just doing normal dosing at the moment, what type of daily fluctuation do you see?
     
  3. lnevo

    lnevo Active Member

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    Here's mine. I ran hourly today to try and get a better idea.

    So I'm either somewhere around 158ppm or up at 163ppm. That's +/- .3dKH. A little dizzying to be sure. I'm hopeful that it will improve over time.

    12/31 19:35:47 W.142 %0 KH - 8.68 dKH / 155 ppm
    12/31 18:24:55 W.144 %0 KH - 9.13 dKH / 163 ppm
    12/31 17:13:55 W.139 %0 KH - 9.12 dKH / 163 ppm

    12/31 15:54:55 W.139 %0 KH - 8.71 dKH / 156 ppm
    12/31 14:36:28 W.141 %0 KH - 9.14 dKH / 163 ppm
    12/31 13:25:35 W.143 %1 KH - 8.82 dKH / 158 ppm
    12/31 12:14:16 W.144 %0 KH - 8.82 dKH / 158 ppm
    12/31 11:02:57 W.140 %0 KH - 8.82 dKH / 158 ppm
    12/31 09:52:00 W.140 %0 KH - 8.86 dKH / 158 ppm
    12/31 08:33:20 W.141 %0 KH - 8.84 dKH / 158 ppm
    12/31 07:14:39 W.142 %0 KH - 9.27 dKH / 166 ppm
    1
    2/31 06:03:34 W.138 %0 KH - 8.85 dKH / 158 ppm
     
  4. lnevo

    lnevo Active Member

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    I also have this in my System Setup, which has come in and out of availability. :(

    Force reverse calibration :

    Unable to execute : Excessive deviation. 1
     
  5. lnevo

    lnevo Active Member

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    So, right now I'm waiting for the new reaction chamber/level sensor/v2 accelerator motor. However, yesterday I installed the lab grade ph probe and today the results are pretty impressive:

    Last 12 results:
    01/05 20:46:41 W.151 %1 KH - 7.60 dKH / 136 ppm
    01/05 18:46:47 W.151 %1 KH - 7.60 dKH / 136 ppm
    01/05 16:46:45 W.147 %0 KH - 7.58 dKH / 135 ppm
    01/05 14:39:49 W.150 %1 KH - 7.59 dKH / 136 ppm
    01/05 12:39:56 W.151 %0 KH - 7.57 dKH / 135 ppm
    01/05 08:46:40 W.152 %0 KH - 7.32 dKH / 131 ppm
    01/05 06:47:15 W.150 %1 KH - 7.48 dKH / 134 ppm
    01/05 04:39:15 W.153 %0 KH - 7.19 dKH / 128 ppm
    01/05 02:40:06 W.150 %0 KH - 7.59 dKH / 136 ppm
    01/05 01:08:02 W.150 %0 KH - 7.58 dKH / 135 ppm
    01/05 00:46:52 W.150 %0 KH - 7.59 dKH / 136 ppm
    01/05 00:02:37 W.149 %0 KH - 7.62 dKH / 136 ppm

    If the newer parts make it any more consistent than that, I'd be really amazed.
     
  6. ReefTeacher

    ReefTeacher Active Member

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    Where did you get your new reaction chamber from? My is about a year old and It has suddenly started throwing a lot of errors. I wonder if replacing the chamber would help.
     
  7. lnevo

    lnevo Active Member

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    DVC advised me to request from Coralvue but they were out of stock so he sent me directly.

    Between the lab grade probe and the new chamber (bigger mangetic stirrer, 9V accelerator motor, better float and level sensor) and results are really tight.

    Last 12 results:
    01/11 16:38:42 W.125 %0 KH - 6.47 dKH / 116 ppm
    01/11 14:38:42 W.131 %0 KH - 6.48 dKH / 116 ppm
    01/11 12:38:42 W.128 %1 KH - 6.48 dKH / 116 ppm
    01/11 10:38:41 W.128 %0 KH - 6.44 dKH / 115 ppm
    01/11 08:45:19 W.132 %0 KH - 6.40 dKH / 114 ppm
    01/11 06:45:01 W.131 %1 KH - 6.37 dKH / 114 ppm
    01/11 04:38:41 W.127 %0 KH - 6.34 dKH / 113 ppm
    01/11 02:38:57 W.128 %0 KH - 6.75 dKH / 121 ppm
    01/11 00:45:00 W.128 %0 KH - 6.35 dKH / 113 ppm
    01/10 22:44:32 W.128 %1 KH - 6.51 dKH / 116 ppm
    01/10 20:45:00 W.128 %0 KH - 6.36 dKH / 114 ppm
    01/10 18:43:20 W.132 %0 KH - 6.34 dKH / 113 ppm

    Now I'm just waiting for a replacement KS motor because I keep getting KS errors and I have to knock the motor to get it moving again...
     
  8. LobsterOfJustice

    LobsterOfJustice Well-Known Member

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    Would you mind posting a picture of your lab grade probe? Where did it come from?
     
  9. lnevo

    lnevo Active Member

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    I ordered the one from CoralVue. The lab grade one. It's the black one in the manual.
     
  10. Dan Snyder

    Dan Snyder Active Member

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    How much do you think a used monitor goes for with AIM?
     
  11. ReefTeacher

    ReefTeacher Active Member

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    On the CoralVue Site they are going for $499
     
  12. Dan Snyder

    Dan Snyder Active Member

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    Used? 250/300$?
     
  13. lnevo

    lnevo Active Member

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    If you can find one...
     
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  14. justingraham

    justingraham Valuable Member R2R Supporter R2R Excellence Award Partner Member 2019 Build Thread Contributor NJRC Member

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    Does anyone know how to test the khg like a 8 dkh standard so we know how far we are actually off?
     
  15. Dan Snyder

    Dan Snyder Active Member

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    Who’s looking? Lol might be selling mine ha
     
  16. LobsterOfJustice

    LobsterOfJustice Well-Known Member

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    My KHG is executing two tests every time it performs a test. I think it has been doing this since I bought the unit last spring. I didn’t think two much of it until I saw someone else mention it in another thread. Has anyone else noticed this or worked with support to fix the issue? Reagent is not cheap and I’d like to not burn through it twice as fast.
     
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  17. justingraham

    justingraham Valuable Member R2R Supporter R2R Excellence Award Partner Member 2019 Build Thread Contributor NJRC Member

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    It does two to get a better reading of alk sometimes three u can turn it off but if u do u can’t turn it back on how to do it is in this thread
     
  18. BZOFIQ

    BZOFIQ Well-Known Member

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    @LobsterOfJustice How is this interfaced with the apex?
     
  19. ihavecrabs

    ihavecrabs Valuable Member R2R Supporter R2R Excellence Award Reef Squad Partner Member 2019 Article Contributor Build Thread Contributor

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    Open ph port and the signals are calibrated. Works pretty well but because it goes from digital to analog back to digital again, the numbers are slightly different.
     
  20. BZOFIQ

    BZOFIQ Well-Known Member

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    So a dKH number is displayed and graphed by apex, correct?
     
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