ph probe suspected

[Tech Diver]

This probe is a cylinder that is 6 inches long and 1 inch in diameter. The diameter is large because it is actually a glass probe housed in an abs plastic sleeve. Since you are planning to use the probe in your Ca reactor (only partially immersed), you can get just the inner part which is the same high-quality double junction refillable unit but with a "standard" 12mm diameter. That part number is:
http://www.novatech-usa.com/Products/pH-ORP-Electrodes-Probes/WD-35805-04

I you prefer a more durable (but expensive) epoxy unit:
http://www.novatech-usa.com/Products/pH-ORP-Electrodes-Probes/WD-35805-09

Either of these will fit into a 1/2 inch port on your Ca reactor.

 

[wizsmaster]

Thank You - I ordered 1 of the "WD-35805-09" for the CA RX & 1 "WD-35805-24" for the sump.
How many refills do you get out of a single refill kit? I ordered 2 kits just to be sure. is there an expiration date on them?

 

[Tech Diver]

You get about 5 or 6 fills from a refill kit and there is a limitted shelf life of 12 months. So your second bottle of solution might expire before you use it all up. But it's fairly inexpensive, so it's not that big a deal. You might want to refill every three or four months since you have plenty of solution to spare. You might be able to stretch out it's shelf life by storing it in the fridge. Now I'm curious and will call the manufacturer to see if that would work since I'm in the same situation as you.

 

[Tech Diver]

I posted this in a separate thread, but here it is again just to be sure that all affected parties read this-

Important information for all of you who have just placed an order with NovaTech for the FULLY SUBMERSIBLE REFILLABLE pH probe that I recommended:

Although I have used and refilled several different models of Oakton pH probes (with which I have been very satisfied), I just went to refill the WD-35805-24, the submersible unit that I have been recommending (this is the big 1" diameter probe). I could not find the opening for the refill hole and called Oakton tech support only to find out that there was an error on the NovaTech web site and the unit is NOT REFILLABLE.

NovaTech has just corrected the information on there web site and is contacting all those who have ordered this unit to inform them of their mistake. If you have one of these probes I would recommend calling NovaTech at 866-433-6682 to ask for either a refund or a different unit.

I am requesting a WD-35805-04 instead ($113). This is a laboratory grade double junction refillable glass unit. Unfortunately, it is not fully submersible so I'll just have to mount it at the top of my sump. But that's OK since it is what I have always done my the other refillable probes.

 

[pgordemer]

<a href=showthread.php?s=&postid=11498519#post11498519 target=_blank>Originally posted</a> by Tech Diver
You get about 5 or 6 fills from a refill kit and there is a limitted shelf life of 12 months. So your second bottle of solution might expire before you use it all up. But it's fairly inexpensive, so it's not that big a deal. You might want to refill every three or four months since you have plenty of solution to spare. You might be able to stretch out it's shelf life by storing it in the fridge. Now I'm curious and will call the manufacturer to see if that would work since I'm in the same situation as you.

Never using a refillable proble before. When you do refill them, or when do you know you have to refill them? What happens when you don't, etc...

 

[Tech Diver]

It's just like what happens with a sealed probe; the accuracy and response time decreases as it gets older. The decision to refill the probe is based on time. I bet there are lots of aquarists who are using "expired" probes and are not aware that they are getting false readings. The nice thing about a refillable probe is that you can refill often to maintain high accuracy and not worry about the cost.

I have four major equipment maintainance periods for my aquarium each year that correspond with the first day of Spring, Summer, Fall and Winter (so I don't forget). I always replace the probe chemicals at each of those periods.