ph probe suspected

dadonoflaw

dadonoflaw

New member
ph probe suspected

i have been fighting low ph issues but now i am not so sure its the water. i put some fresh ro water in a container and put the probe in and it read 9.38. that doesnt sound right. then i added salt and it kept going down and is currently at 7.87. the water is at 1.028 sg. when i added my ca and alk for the day earlier the ph went from 7.8 to 7.49 which i heard someone say cant be right. probe error? sps are showing polyps and seem unaffected. alk is 9.5 ca is 440ppm
 
i calibrated it about a month ago. i wiped the tip off when i did this. should i be cleaning it in some special way?
 
Again I must ask how old is your probe, because they should be replaced after 6 to 8 months, or refilled every 4 months. I have a refillable probe and I find it very economical to use. It costs me only about $3 to replace the chemicals in it (Potassium Chloride).
 
<a href=showthread.php?s=&postid=11446000#post11446000 target=_blank>Originally posted</a> by Tech Diver
Again I must ask how old is your probe, because they should be replaced after 6 to 8 months, or refilled every 4 months. I have a refillable probe and I find it very economical to use. It costs me only about $3 to replace the chemicals in it (Potassium Chloride).
Click to expand...

Can you tell me a little more about the refillable probe? Where do you get it and the replacement chemicals?
 
There are a number of companies that sell these. Aquamedic for one, but they just re-lable another supplier with their own name. However, I prefer a much higher grade probe directly from the source where you can also get the refill kits. Here is what I wrote in an earlier post about these probes:

I particularly like the probes manufactured by Oakton (true laboratory quality and accuracy). I purchased a completely submersible double-junction refillable probe from Nova-Tech:

http://www.novatech-usa.com/Products/pH-ORP-Electrodes-Probes/WD-35805-24

This $114 probe is permanent and I only need to refill it every 4 or 5 months with about $3 worth of solution. I really pays to refill, especially when you can get such a high quality piece of equipment.
 
Not meaning to hijack this thread, but I've had the same problems with my my pH probe.

Tech Diver,
I'm thinking about ordering the probe you're suggesting, it would be really nice to have a permanent probe and save a few bucks in the long run. What refill solution should be used, is it compatible with the BNC connection on an aquacontroller Jr., and is it calibrated the same way as the disposible probes?

Thanks,
Carlos
 
I have also been having issues with my probe readings, I even went out and bought a new probe and calibrated it according to the instructions, all my liquid ph tests were reading perfect (8.2-8.4) while my probe hooked to my acjr was reading in the 7 range. Turns out because I hooked my acjr to my computer I now have to buy an isolater to run between the unit and computer... thanks neptune...
 
<a href=showthread.php?s=&postid=11451318#post11451318 target=_blank>Originally posted</a> by michaeljames
I have also been having issues with my probe readings, I even went out and bought a new probe and calibrated it according to the instructions, all my liquid ph tests were reading perfect (8.2-8.4) while my probe hooked to my acjr was reading in the 7 range. Turns out because I hooked my acjr to my computer I now have to buy an isolater to run between the unit and computer... thanks neptune...
Click to expand...

Can you tell me a little about the isolator? Maybe that is my problem.........your situation sounds very familiar!!!
 
<a href=showthread.php?s=&postid=11452147#post11452147 target=_blank>Originally posted</a> by KyleO
Can you tell me a little about the isolator? Maybe that is my problem.........your situation sounds very familiar!!!
Click to expand...


I contacted neptune, the part is available for $45 and the part # is SERIPC9. it is supposed to break the ground loop between the neptune and the computer, Good luck!
 
<a href=showthread.php?s=&postid=11450306#post11450306 target=_blank>Originally posted</a> by Tech Diver
The refill solution is KCl (Potassium Chloride), which is a harmless salt. Some other probes contain silver compounds but this is safe. The link to the refill solution is here:

http://www.novatech-usa.com/Products/pH-ORP-Solutions-Parts-Accessories/WD-35803-74

With some refillable probes, you can only immerse them about halfway up to the refill hole. But this probe is completely submersible. In fact, I have it lying at the bottom of my sump.
Click to expand...

it is very safe, if you have high blood presure, put it on your food in place of table salt.

has anyone else used this probe? my robe has been running since April, but there is still liquid in it. not sure how to tell when it is time to replace, but I think I am going replaceable
 
I am running all possible solutions to my "probe" problem:

I have pestered Curt at Neptune into a PH probe replacement, I have ordered my refillable probe from Novatech, ordered the SERIPC9 and also ordered single use calibration packets from Marine Depot since Curt has stated that the bottled calibration fluids are notoriously off.

Sorry for the high-jack, I am just dealing with the exact same issue(s) and wanted to offer a little "extra" info for anybody that needs it.
 
Thanks, I'm placing my order now. Hopefully this cures the problem I'm having with my current probe. Any idea on how long these can be refilled without losing their accuracy?

Carlos
 
<a href=showthread.php?s=&postid=11450306#post11450306 target=_blank>Originally posted</a> by Tech Diver
The refill solution is KCl (Potassium Chloride), which is a harmless salt. Some other probes contain silver compounds but this is safe. The link to the refill solution is here:

http://www.novatech-usa.com/Products/pH-ORP-Solutions-Parts-Accessories/WD-35803-74

With some refillable probes, you can only immerse them about halfway up to the refill hole. But this probe is completely submersible. In fact, I have it lying at the bottom of my sump.
Click to expand...

Tech Diver,

is this probe round, or oval? I'm looking to put one in my CA RX ...

Thanks,
--marco
 
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