Explore the OxyGuard range of professional water quality probes for continuous monitoring in aquaculture. Designed for accurate and reliable measurement in demanding aquatic environments, OxyGuard sensors monitor essential parameters including dissolved oxygen, optical oxygen, CO₂, pH, Redox, temperature, salinity, ozone and total gas pressure (TGP). Compatible with OxyGuard monitoring and control systems, these probes provide dependable water quality data for fish farms, hatcheries, RAS facilities and other aquaculture applications.
The Model 420 is a membrane covered galvanic oxygen probe with built-in two-wire 4-20 mA transmitter. The probe is connected to a DC supply and draws a current of between 4 and 20 mA corresponding to the oxygen concentration.
There are only two wires to connect, and there is no limit to cable length. The output signal is galvanically isolated from the built-in electronics and the process fluid. Interference between the Model 420 and other equipment can never occur!
The OxyGuard Model 420 can therefore be connected directly to a wide range of equipment that can accept a 4-20 mA input, such as alarms, indicators, controllers, recorders, PLC’s, PC systems with A/D input etc.
The Model 420 can also be used to measure gaseous oxygen concentration.
D033 OxyGuard Model 420 DO Probe for 4-20mA
OxyGuard temperature probes are robust, accurate and easy to use. They are filled with a special compound that protects against moisture. As standard the probes are fitted with 7 m cable, but they can be supplied with other lengths on request. The sensor in both types of probe consists of a stainless steel cylinder containing the thermistor or Pt100 element. This sensor tip is fitted to a black plastic housing. Standard types of housing are shown overleaf, but others can be supplied on request, e.g. to fit other pipe threads or fittings.
The OxyGuard Salinity Probe is specially designed for aquaculture use. Factory calibration and automatic temperature compensation make it very easy to use. It is found in two versions. One is a 3-wire 4-20 mA sensor – connect it to 24 VDC and the output varies between 4 and 20 mA according to the salinity. The other has data bus connection for use with OxyGuard Pacific.
The probe is designed to be as trouble-free as possible, with features specially suited for aquacultural use. Inductive technology is used so that you don’t have to worry about deposits on the surface of the probe – all you have to do is ensure that the hole in the probe is open and relatively clean.
The probe measures salinity according to the internationally agreed PSS-78 scale (Practical Salinity Scale 78).
Commander probes, 4 wire cable, for Commander, Pacific and Atlantic: D0243C: For mg/l and % saturation measurements. Also measures temperature
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
These OxyGuard probes consist of an electrode and an impedance converter inside a twopart housing held together by a threaded collar. There is extra sealing so that the connections at the top of the electrode remain dry even when the probe is completely submersed. The impedance converter immediately over the electrode eliminates electrical noise problems and permits the use of ordinary cable to connect the probe. Either lightduty or heavy duty OxyGuard pH or redox electrodes with flange fittings can be used.
As standard probes are manufactured from PVC (for temperatures up to 60°C), but on request they can be supplied in other materials, e.g. PP for up to 10 bar at 25 °C, 4 bar at 90 °C, or PVDF for up to 6 bar up to 100°C, 2 bar at 120°C.
There are three basic designs, one for free mounting, one with a 3/4″ tee for flow-through use, the third designed to be screwed into a pipe, flange or other suitable fixture. The probes can be ordered with a 1″ thread at the top of the top part for mounting purposes. OxyGuard also manufacture probes to customer specification, so please ask if you cannot use a standard design. As standard the probes have 7m cables.
For Heavy Duty use in very dirty environments probes can be supplied with a probe cleaning system. This has, for example, proved effective when measuring agricultural slurry – add “C” to ordering number. Several types of mounting device are also available. These are described in separate brochures.
K01 OxyGuard Static pH / Redox Probe
The OxyGuard TGP probe measures Total dissolved Gas Pressure and is designedspecifically for use with OxyGuard Commander or Pacific systems. It can be addedto existing systems. It contains sensors for dissolved gas pressure and temperature.The gases dissolved in water consist of oxygen and “other gases”. “Other gases” aremainly nitrogen. It is important to measure if the water is supersaturated in order toprevent the fish from getting gas bubble disease.
The Commander or Pacific system to which the probe is connected uses a dissolvedoxygen measurement made by a DO probe placed near the TGP probe forcalculations and presents the degrees of saturation for the total gas, dissolvedoxygen and for “other gas”.
F01 OxyGuard Total Gas Pressure probe
The OxyGuard CO2 probe is a reliable and easy to use probe that measures the free dissolved CO2 directly and is not affected by carbonates or other dissolved substances.
OxyGuard CO2 Probe Brochure
Accurate CO2 Measurement
OxyGuard's CO2 Probe for Pacific and Marlin offers precise and reliable measurement of carbon dioxide levels in your aquarium. With advanced sensors and technology, this probe ensures accurate readings to help maintain optimal water quality for your marine life.
Easy Installation and Monitoring
Designed specifically for use with the Pacific and Marlin systems, this CO2 probe is easy to install and integrate into your setup. Simply connect the probe to your OxyGuard monitor and start monitoring CO2 levels in real-time. The user-friendly interface allows for seamless monitoring and adjustments as needed.
Enhance Marine Life Health
By using the OxyGuard CO2 Probe for Pacific and Marlin, you can ensure that your marine life is living in a healthy environment with optimal CO2 levels. By maintaining proper CO2 levels, you can enhance the health and vitality of your aquarium inhabitants, promoting growth and longevity. Trust OxyGuard for reliable CO2 monitoring solutions tailored to your specific needs.
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.
The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today.Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
The measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”.
OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today.
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
The OxyGuard Salinity Probe is specially designed for aquaculture use. Factory calibration and automatic temperature compensation make it very easy to use. It is found in two versions. One is a 3-wire 4-20 mA sensor – connect it to 24 VDC and the output varies between 4 and 20 mA according to the salinity. The other has data bus connection for use with OxyGuard Pacific.
The probe is designed to be as trouble-free as possible, with features specially suited for aquacultural use. Inductive technology is used so that you don’t have to worry about deposits on the surface of the probe – all you have to do is ensure that the hole in the probe is open and relatively clean.
The probe measures salinity according to the internationally agreed PSS-78 scale (Practical Salinity Scale 78).
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.
The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today.Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
The measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”.
OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today.
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.
The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today.Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
The measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”.
OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today.
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.
The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today.Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
The measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”.
OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today.
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
OxyGuards new optical oxygen probe is developed in cooperation with world leading experts. Based on luminescence quenching of a sensor dye immobilized on a support foil it can be used for gas measurements as well as for dissolved oxygen (DO).
The presence of molecular oxygen quenches the luminescence, changing its intensity and lifetime fully reversibly. The measurement principle is very robust. It shows virtually no interference to other gases and has very low drift. Bleaching is not an issue because low energy red light excites the sensor spot and emission is NIR.
Special features
High-accuracy measurements of oxygen in gas or water (DO)
Low drift
Long lifetime
Fast response
Digital output of all major oxygen units
Technical Data Sheet
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.
The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today.Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
The measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”.
OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today.
*Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
The OxyGuard Standard Probe – the probe that revolutionised oxygen monitoring.The probe that you can purchase today is even better than the probe introduced in 1987 that helped revolutionize fish farming and make modern aquaculture the industry it is today. Today’s OxyGuard Standard Probe is hermetically sealed. If needed you can open it to replace the membrane and renovate it completely, but this should not be needed for many years.
DescriptionThe measurement stability of the OxyGuard Standard Probe is also very high indeed. A probe measuring in air will maintain accuracy even when subjected to a sudden 20 degree celcius temperature change. The sensitivity of a probe measuring in clean air at room temperature will remain the same for at least 3 years. This proves that the OxyGuard probe is not, like some other probes, affected by “ageing”. OxyGuard believe that the OxyGuard Standard probe is more accurate, needs less attention and maintenance and has a lower total cost of ownership than any other oxygen or dissolved oxygen probe offered to the aquaculture industry today. *Accessories are shipped with every OxyGuard probe. You will thus be able to change the membrane if you manage to damage it during installation. Otherwise the accessories can be enough for up to 5 years’ use.
OxyGuard's developed ozone sensor is designed specifically for use in aquaculture. The sensor uses an entirely new innovative technology, and the partial pressure of ozone is measured directly without the use of electrolyte, reagents, light, or other traditional methods. As a result, there is almost no maintenance, the probe is exceptionally stable, and the response time is extremely fast.With the possibility to measure ozone content in the water down to only a few μg/L, it is possible to ensure safe conditions for the stock.
Unit of Measurement: ppm (mg/l)Measuriing Range (Low): 0-0.8mg/l (best between 0 and 0.5)Mesauring Range (High): 0.5-8mg/lOperating Temperature: 0-40CDimensions: 40 x 104mmCable Legnth: 7mResponse Time: 90% in less than 45s (for the low range type)Medium: WaterInstallation: For use with Pacific or Marlin
G20 OxyGuard Ozone Sensor Data Sheet
Accurate water quality monitoring starts with reliable sensors. OxyGuard water quality probes are designed for continuous measurement in demanding aquaculture environments, providing dependable data to help fish farmers maintain optimal water conditions and manage production systems effectively.
With decades of experience in water quality measurement technology, OxyGuard offers a comprehensive range of specialist probes for dissolved oxygen, pH, CO₂, temperature, salinity, total gas pressure and other critical water quality parameters.
Suitable for fish farms, hatcheries, recirculating aquaculture systems (RAS), marine aquaculture and industrial water applications, OxyGuard probes combine measurement accuracy, robust construction and reliable long-term performance.
Comprehensive Water Quality Measurement
The OxyGuard probe range covers the essential parameters required for professional aquaculture monitoring:
Dissolved Oxygen (DO) Probes
Monitor dissolved oxygen concentrations in water to help maintain the oxygen levels required for fish health, welfare and growth. OxyGuard offers electrochemical oxygen probes for continuous measurement in different aquaculture applications.
Optical Dissolved Oxygen (LDO) Probes
Use optical luminescence technology for dissolved oxygen measurement. Optical probes offer an alternative to conventional electrochemical sensors and are suitable for continuous water quality monitoring.
Carbon Dioxide (CO₂) Probes
Measure dissolved carbon dioxide directly in water. Monitoring CO₂ is particularly important in intensive fish farming and recirculating aquaculture systems, where carbon dioxide accumulation can affect fish health and system performance.
pH and Redox (ORP) Probes
Monitor water acidity, alkalinity and oxidation-reduction potential. These measurements provide valuable information for water quality management, treatment processes and aquaculture operations.
Total Gas Pressure (TGP) Probes
Measure total dissolved gas pressure and help identify gas supersaturation. Monitoring TGP is important in aquaculture because excessive dissolved gas pressure can contribute to gas bubble disease in fish.
Temperature Probes
Provide continuous water temperature measurement, an essential parameter influencing fish metabolism, oxygen demand and overall production conditions.
Salinity Probes
Measure salinity and conductivity to support water quality management in marine and brackish water aquaculture.
Ozone Sensors
Monitor ozone levels in water treatment applications, supporting controlled ozone use in aquaculture water treatment systems.
Designed for Continuous Aquaculture Monitoring
OxyGuard static probes are developed for permanent or semi-permanent installation in water monitoring applications. Depending on the model, probes are available in different configurations for submersible, flow-through or fixed installation.
Their robust construction makes them suitable for demanding operating environments, including fish farms, hatcheries, RAS facilities and industrial water treatment installations.
Selected models also offer specialised materials, mounting arrangements, cable lengths and cleaning options to suit individual installation requirements.
Compatible with OxyGuard Monitoring and Control Systems
OxyGuard probes are designed to work with compatible OxyGuard monitoring and control equipment, including Marlin+, Pacific, Commander and other dedicated instruments, depending on the probe model.
When connected to a suitable monitoring system, the probes provide continuous measurement data that can support automated oxygen control, water quality management, alarms and data logging.
Why Choose OxyGuard Water Quality Probes?
Accurate and reliable water quality measurement.
Specialist sensors for a wide range of water quality parameters.
Robust construction for demanding aquaculture environments.
Solutions for continuous and permanent monitoring.
Different mounting and installation configurations.
Compatible options for OxyGuard monitoring and control systems.
Replacement and specialist probe configurations available.
Find the Right OxyGuard Probe at GroAqua
Choosing the correct probe is essential for reliable water quality monitoring. Consider the parameter you need to measure, the installation environment, mounting arrangement, cable length and compatibility with your existing monitoring equipment.
At GroAqua, we supply OxyGuard water quality probes and accessories for professional aquaculture applications. Whether you need a dissolved oxygen sensor, CO₂ probe, pH electrode or specialist TGP sensor, explore our range to find the right solution for your monitoring requirements.
