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GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 others

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GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 others

Postby Macca_75 » Thu 21 Mar, 2019 2:22 pm

OK - I'll see if any users still actively look at anything here or if it's all F/B driven.

Recently I picked up a second hand Profilux 3 and a bag full of GHL goodies to go with it. Then I went an bought another P3 ex (so the original is now a test unit I am using to test building an Arduino to control my DIY LED lights using Profilux)

Amongst the bag of goodies there are 7 GHL dosing pumps (haven't checked if they are all working) - 1 x 4 head master and 1 x 3 head slave. Currently I run the 4 head Doser 2 SA unit, hence I haven't test if these older units work or not.

Having 7 extra heads means I can start looking at some other GHL products, such as KH director and this

https://www.reef2reef.com/threads/ion-d ... st-5853687

According to the posts it will measure at least CA and MG (with an interesting use of the words "at least"). No reagents required, however it does require (automatic) calibration.

There might be a use for the extra dosing heads after all.

Does anyone know of any other manufacturers currently working on monitoring these 2 elements?
Last edited by Macca_75 on Mon 25 Mar, 2019 10:01 am, edited 2 times in total.
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Re: GHL/Profilux users

Postby saltydog » Thu 21 Mar, 2019 4:48 pm

Apex and Reefbot are the only ones I know.
Actually I think KH Guardian do one for Ca and Mg.
And I'm sure Jonas (alkaltronic) mentioned about Ca in the works. Need to check that one
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Re: GHL/Profilux users

Postby Macca_75 » Fri 22 Mar, 2019 9:13 am

Thanks - will look into each. Testing is currently my #2 chore (next to keeping the glass clean).

Is only "at least" meant NO3 and PO4.... Then GHL would be on a winner.
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Re: GHL/Profilux users

Postby saltydog » Fri 22 Mar, 2019 11:43 am

GHL would be the only one using ion selective probes. (if that is what they are actually using?????). The others as far as I'm aware are using colorimeters to test.
I would be surprised if "at least" meant NO3 and PO4.
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Re: GHL/Profilux users

Postby Macca_75 » Mon 25 Mar, 2019 10:01 am

https://www.reef2reef.com/threads/ion-d ... st-5866822

NO3 + PO4 + 2 others are what's on the cards
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Re: GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 oth

Postby saltydog » Tue 26 Mar, 2019 5:34 pm

:thumbsup: Look forward to seeing how they go.

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Re: GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 oth

Postby saltydog » Wed 27 Mar, 2019 9:14 pm

So now it make more sense why GHL starting that thread prior to any real details:
https://www.reef2reef.com/threads/measure-calcium-and-magnesium-level-by-a-selective-ion-electrode-does-not-require-reagents.549297/

I hope they can get usable precision on NO3 and PO4 but I'll wait for the proof :wink:
On the Ca and Mg, it's not something that I would pay to much for. Both are easily adjusted according to alk usage, monitered with an alk controller.

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Re: GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 oth

Postby saltydog » Thu 28 Mar, 2019 10:16 am

From the Xepta web page:

The equipment has an accuracy of ± 10ppm in the values ​​of calcium, magnesium, potassium and nitrate and a repeatability of ± 2%.


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Re: GHL/Profilux users - Monitoring Ca, Mg, NO3, PO4 + 2 oth

Postby Macca_75 » Thu 28 Mar, 2019 1:00 pm

I guess GHL will be using the same theory/parts. I was (pleasantly) surprised to see GHL as all but confirming NO3 and PO4 are also going to be part of the solution.


For Mg and Ca I think +/- 10ppm is fine (I am colourblind so struggle to get results to that accuracy anyway on the Mg test)


Would need to be more accurate for NO3/PO4 though (obviously).

Assuming GHL are using the same probes - they tend to use very high quality components. Maybe they will have a more accurate probe.
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