Neptune Systems

Lab Grade Dissolved Oxygen Probe

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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

C (F) 0ppt 5ppt 10ppt 15ppt 20ppt 25ppt 30ppt 35ppt
18 (64.4) 9.45 9.17 8.90 8.64 8.38 8.14 7.90 7.66
20 (68.0) 9.08 8.81 8.56 8.31 8.06 7.83 7.60 7.38
22 (71.6) 8.73 8.48 8.23 8.00 7.77 7.54 7.33 7.12
24 (75.2) 8.40 8.16 7.93 7.71 7.49 7.28 7.07 6.87
26 (78.8) 8.09 7.87 7.65 7.44 7.23 7.03 6.83 6.64
28 (82.4) 7.81 7.59 7.38 7.18 6.98 6.79 6.61 6.42
30 (86.0) 7.54 7.33 7.14 6.94 6.75 6.57 6.39 6.22

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.


pdf icon DO Probe Replacement Membrane Manual.pdf

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UPC 696859111273
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Product Questions

I dont see the DO probe replacement membrane being available for purchase. Does it come in multi-pack or individual only?
Question by: Leisure_man on Feb 4, 2016, 12:41 AM
Great question!
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!
Answer by: Connor on Feb 4, 2016, 2:59 PM