- Lab Grade Dissolved Oxygen Probe - Neptune Systems
Lab Grade Dissolved Oxygen Probe for Neptune PM3 Module.
The price of the probe isn't all that cheap compared to the traditional probes we use in this hobby, but this probe can easily last you a lifetime because the actual sensing membrane is replaceable. About every 3 months you will need to replace the membrane within the probe, which can be done in a matter of minutes and is very economical. After replacing the membrane the probe will function as if it were new.
Includes 10ft cable.
Sensor Membrane within the probe should be replaced every 3 months
Dissolved oxygen can easily be manipulated with either air pumps and air stones, aiming return nozzles at the surface of the water, or a water pump that vertically pushes the water to the surface to allow for gas exchange. In a typical reef tank, most O2 is lost and transferred with CO2 at the surface of the water. Another large sink for dissolved oxygen to be consumed is settled detritus, food, and other dissolved organic compounds. As the process breaks down organic compounds dissolved oxygen will be consumed. For overstocked tanks that can cause a huge issue as your animals will consume the oxygen as well as their waste which could lead to dangerously low levels of dissolved oxygen.
Dissolved Oxygen Saturation Table
As an example, a tank with a salinity of 35ppt and a temperature of 78.8 degrees Fahrenheit can have a maximum dissolved oxygen amount of 6.64ppm. A freshwater tank with a salinity of 5ppt at 75.2 degrees can dissolve 8.16ppm of oxygen at 100% saturation. On average dissolved oxygen (DO) rates will be around 70%. We suggest maintaining a DO level of 4.5-7ppm, as stress signs can be seen anywhere below 4ppm and fatalities can start to happen below 3ppm.
High Quality, Stable, Interesting data By Justin on 4/1/2019Justin would recommend this product to a friendMy display tank peaks at about 92-93% around noon when photosynthesis and wavemakers are at their max, and drops to 89 during the night. I definitely saw a significant drop in O2 when I did a feed timer (return pump & skimmer off) from the Apex, but want to experiment some more as I had a couple of variables changing at once as I was trying to tune in my feed timer settings.
The probe itself is bigger than I expected, very solidly built/robust. The cord is really long (haven't measured yet) which let me measure my quarantine tank for a few days (it baselined at 84% saturation and I'll be adjusting the circulation to push this up).
I have yet to find any good documentation on ideal saturation for reefs... there's some good research about hypoxia (low o2) and how well corals and tropical reef species handle it, but I've yet to find 'ideal' recommendations or 'too high' saturation levels.
Overall, for home aquariums, this is definitely a 'luxury' item, good for people who love data and the science behind our little puddles of ocean, but from what data I've seen we're so far above 'hypoxic' levels in a typical aquarium this is far from required.
Footnote: I received the probe and it wouldn't calibrate. Sent it back to Neptune and they cleaned it up and put a new membrane on it and it's good as new. I guess at this price point these aren't flying off the shelves, so if this happens to you just contact Neptune and you should be g2g after a ~6 day round trip.
Not bad By David on 4/9/2016David would recommend this product to a friendIf you have the cash this is a pretty nifty probe to run with the apex (definitely if you are looking for all the bells and whistles). For the most part my O2sat is 90+% so this dose not seem to be necessary but it is sensitive and when my Alk went up, this was the first sing was the drop in my o2 sat.
I dont see the DO probe replacement membrane being available for purchase. Does it come in multi-pack or individual only?
We do not currently have the replacement DO membranes however do expect to receive the membranes as an option in the very near future, They membranes may currently be available from Neptune Systems directly. Feel free to let us know if you have any further questions!