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
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 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/l Operating Temperature: 0-40C Dimensions: 40 x 104mm Cable Legnth: 7m Response Time: 90% in less than 45s (for the low range type) Medium: Water Installation: For use with Pacific or Marlin
G20 OxyGuard Ozone Sensor Data Sheet
