ATO with 2.1 Doser

[mlandscape]

I have just set up my ATO using one of the pumps on my slave 2.1 doser with a pump speed of Fast and after calibration set at 36ml per min.

I have followed the video by using the exact same set up with the acrylic rod, an optical sensor for the minimum and the float sensor for the maximum using a splitter cable to connect to the level connections on the Profilux but I am not sure it is working correctly. It is set to Min-Max Control

With the positions, I had set the two sensors at to start with and with a 5-minute maximum on time the water level did not reach the float sensor and alarmed. Even though I have the alarm set to reset error automatically on this occasion whilst I was setting things up I reset it myself so it could run again. I have subsequently tried at 12 and 15 mins and in both cases it has alarmed out without reaching the float sensor. For the last two 12 and 15mins, I had moved the sensors as close as I could together: 1 because of the timeout 2 because I was concerned at the amount of RO water being added at a single dose 433.2 ml and 541.2 ml and 3 whether the doser pump would be able to continuously dose for such a long period.

Since the last dose which was at midnight, I did not turn off the alarm myself but left it because I was under the impression that the alarm would reset itself when the water level dropped below the minimum. Although it now appears as if the water level is below the minimum the alarm as not cleared and no further dosing as happened. This is now over 14.5 hours after the last top-up so I have reset manually and the doser immediately started to top up.

I am not sure what the problem is but it quite clearly doesn't seem to be working as I would expect.

I have attached a photo of the sensors as now positioned(Sorry the photo needs turning through 90 degrees to the left to show the correct orientation and a series of screenshots of the setup and the top-ups that have occurred.

Any help would be appreciated.

Many thanks

UPDATE UPDATE

After clearing the alarm like I said the doser started immediately and alarmed out again after the 15 minutes having dosed 541.2 ml exactly as per the last dose. Although it is difficult to see properly in the sump the water level after that dose seemed to be just touching the bottom of the float sensor but maybe not quite enough to turn the pump off - either that or the float sensor is not working. I have again cleared the alarm manually.


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