pH probe trending down??

[Nexenn]

I have a brand new pH probe from BRS that I calibrated and put in my Ca reactor. Worked great for about 2-3 days then the pH started trending down to about 2. The probe doesn't appear damaged and I have a second probe on my apex that is calibrated to compare readings. When I put the new BRS probe in the tank the pH shoots up to about 7 but doesnt actually move towards a set value and fluctuates a lot. Then it trends back down with an exponential type line on my pH graph.

When I look at the ph2 settings I found the scale line to read "0.fe4" and the ph1 probe reads "1.045"

Anyone know if the pH probe is busted or the apex settings are wrong?

 

[Deleted member 143833]

The probe that read 2 sound like it might not be healthy; have you tried to re-calibrate it?

You can't just connect a new probe; it needs to be calibrated.

 

[Nexenn]

I did calibrate both probes. The new one just isn't working and I noticed in the apex settings the pH2 or the new/malfunctioning probe has some weird looking settings. I'm asking if its the probe or the apex settings?

I guess ill try and calibrate it again and see if it helps

Anyone else have any thoughts?

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[cdarte]

This is wierd. I am having same exact problem with same probe. When I try to calibrate ph2 it fails.

 

[Nexenn]

Dang, at least I'm not the only one. Maybe someone could shed some light on ways going on.

I'm certain that it worked well for at least 2-3 days.

On a side note and I'm really just ranting.... I just have to say how frustrating it is when I say at least twice in my original post that I did calibrate the probes and the first response is someone telling me that I need to make sure and calibrate my probes.

Try to actually read the situation and question before responding please. The issue is that I have two new calibrated probes. Probe one is working well and is accurate. Probe two however worked well for 2-3 days and is now showing an exponential looking decline in pH on data graphing when the pH is known to be relatively constant.

The question is whether its the apex settings that are the problem, the probe needs to be recalibrated and something done to prevent the probes outlet from spontaneously failing again. Or the probe itself is defective and needs replaced(even though its brand new).

 

[Nexenn]

Specifically , does anyone see anything wrong with the disparity in the "scale" settings of pH1 vs pH2. If this value should be a number then when is the scale for probe 2 some weird non numerical entry? And why did it work for a bit and change?

 

[Nexenn]

Bump

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[RussM]

Did you calibrate the probes? j/k

Try swapping the probes, then recalibrate both probes. See if the problem moves... if it does move, the issue is with a probe; if not, the issue is with the controller.

 

[Nexenn]

dang, going to have to buy some more calibration packets