Automatic, regular, unattended alkalinity monitoring

JimWelsh

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For those of you attending MACNA this coming weekend, keep an eye out for me demonstrating a prototype of my Alkalinity Monitor device. It is capable of interfacing with any controller that can accept a pH probe's input. It has both an accuracy and also a precision of +/- 0.05 dKH. I'm thinking this could be a game changer.

Here is an Apex graph of two day's worth of monitoring of my tank, showing a small daily alk swing in response to the photoperiod:

Diurnal%20Alkalinity%20Swing%20-%20Two%20Full%20Days_zpsbunbn6zk.png
 

Sabellafella

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When should we expect the thread on this to popup ;)
For those of you attending MACNA this coming weekend, keep an eye out for me demonstrating a prototype of my Alkalinity Monitor device. It is capable of interfacing with any controller that can accept a pH probe's input. It has both an accuracy and also a precision of +/- 0.05 dKH. I'm thinking this could be a game changer.

Here is an Apex graph of two day's worth of monitoring of my tank, showing a small daily alk swing in response to the photoperiod:

Diurnal%20Alkalinity%20Swing%20-%20Two%20Full%20Days_zpsbunbn6zk.png
 
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JimWelsh

JimWelsh

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Here is a graph where I programmed my Apex to control alk dosing in response to the monitor's output so as to keep it right at a target value, 8.0 dKH in this instance.

Here is the Apex program for the Outlet that controls the alkalinity dosing pump:

Fallback OFF
OSC 000:00/000:44/006:10 Then ON
If Alk > 08.00 Then OFF
If Alk < 07.10 Then OFF

The reason for the "If Alk < 07.10 Then OFF" line is that if my device were to ever lose power for whatever reason, the output would drop to 7.0 (same voltage as a pH probe at pH 7.0 = 0.0 volts). In that case, I don't know what the alkalinity really is, so stop dosing, and configure an alarm to go off elsewhere in the Apex programming.


Snoozefest_zpsu2q1ijc3.png
 

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