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 Water analysis >
Monitor and oxygen control
  > Printable version
OxyGuard 1

The OxyGuard 1 system measures dissolved or gaseous oxygen.
Typical uses are:

  • Dissolved oxygen monitoring in sewage treatment plants.
  • Effluent monitoring in industry, land fill sites etc..
  • Monitoring of oxygen levels in clean water, beverages, oil etc..
  • The measurement of the purity of oxygen gas from oxygen generators.
  • Alarm monitor for the contamination of inert or other gas by oxygen.
  • Safety monitor where air could contain too low or too high oxygen levels.

OxyGuard 1 meets all of the usual demands made to such equipment, and has a galvanically isolated analogue output and three relay outputs with individual set points. The system is flexible; the user can change the range setting, choice of alarm function and analogue output type.

Technical Advantages


  • 12 measurement ranges the user can easily change the range.
  • 0-20 or 4-20 mA analogue output, max. load 750 ohm.
  • Power supply either 230/115 VAC or 24 VDC.
  • Three relay outputs can be individually set to normally open or normally closed operation.
  • Wall-mount and panel-mount versions.
  • Full galvanic isolation between input and outputs.


  • Galvanic type - True zero. With built-in temperature compensation.
  • Excellent long-term stability.
  • No practical limit to cable length - extension can be made with any type of cable.
  • Needs only very small water flow for correct measurement.
  • Tough membrane can be wiped clean with cloth or paper.
  • Does not need regular service or renovation.
  • Wide range of armatures and fixtures - e.g. the Pioneer for use in sewage treatment plants, the Air Alarm for worker safety in areas where fluctuating oxygen levels could occur, Flow Cell etc. Ask for details.
  • Wide range of accessories - e.g. the EasyCal calibrator, OxyClean compressed air cleaner etc.



Dimensions: Diameter = 58 mm, length = 59 mm. Standard cable length = 5 m.
Weight: 400 g incl. cable.
Principle of Measurement: Galvanic cell, self polarizing, self temperature compensating.
Operating Conditions: 0 to 40°C, and pressure to 10 atm. or more (liquid measurements only).


Construction: ABS/Acrylic enclosure containing front panel with display, set point and calibration adjustments; main circuit board with power supply, terminals, electronics and relays.
Dimensions: 1W: b x h x d: 175 x 235 x 85 mm. 1P: Cut-out 66 x 137 mm., depth 150 mm.
Weight: Approx. 1 kg
Supply: 230/115 VAC or 24 VAC. Please specify when ordering.
Operating Conditions: -10 to +50°C. Enclosure rated IP65.
Output: 0/4-20 mA. Max. load 750 ohm. Fully galvanically isolated from the input
Range: ppm: 0-5.0, 0-10.0, 0-20.0 and 0-100.0 ppm. (mg/l).
% sat:, 0-50.0, 0-100, 0-200 and 0-1000 % sat,
% volume: 0-25.0, 0-50.0 and 0-100% volume,
Accuracy/Repeatability: Accuracy depends on method of calibration and reference method. Repeatability is typically better than +/- 0.5% of measured value.
Relay Outputs: 2 alarm output relays, marked "HI" and "LO", with potential free changeover contacts. The relays are normally energized for fail safe operation.
One CON output - potential free changeover contact.

The equipment is delivered ready for use

OxyGuard 6

OxyGuard equipment is manufactured to give no-nonsense measurement, according to the following three criteria:

  1. The equipment must be perfect for the job - but people shouldn't have to pay for something they don't really need.
  2. Anyone should be able to install OxyGuard equipment and use it - without having to read through thick books first.
  3. It should be possible for anyone anywhere in the world to service OxyGuard equipment.

The OxyGuard 6 and OxyGuard 8 epitomize the above criteria. They are metering and monitoring units for up to 6 and 8 channels respectively. Housed in the same size enclosure, they differ in that the OxyGuard 8 has an external power supply. They are modular - you only install the number of channels you need. Extension can be performed at any time by adding a probe and plug-in transmitter. Dissolved oxygen is the primary parameter, but the units are often used for pH and temperature.

The OxyGuard 6 and 8 feature full galvanic isolation between inputs and outputs. Each channel has analogue, control and low alarm (relay) outputs, and there are common low and high alarm outputs and a display with selector switch. Designed to be mains powered, the units can be permanently connected to an emergency supply of 24 VDC. Changeover will take place automatically and alarm will be given if the mains should fail.

A Multilog can be connected to record measurements and act as a link to a PC for data processing and storage as well as the observation of here-and-now conditions.

Technical Advantages

MODULAR CONSTRUCTION: It is possible to begin with a single measurement and expand later - this can be performed by the user. You only pay for what you need!

LARGE SYSTEMS: Units can be combined as desired to form systems of any size.

REGULATION AND CONTROL: Each channel (measurement) has a change-over contact to control aerators or other dosing equipment.

ALARMS: There is an extensive alarm system, with individual low alarm, common high alarm and common low alarm contact outputs. The common alarms will also trigger on power failure

SAFETY: The above alarm functions give good security. The units can also, as standard, be connected to 24 VDC, e.g. from a battery. Change-over will automatically take place if the mains supply fails. The units have no computer that can "hang". If a fault in one channel occurs the rest of the unit will carry on working - and the fault can easily be rectified by changing a transmitter.

DATA COLLECTION & RECORDER CONNECTION can easily be performed by making connection to the analogue output signals. The MultiLog is designed for this purpose, and will also give direct on-line connection to a PC.

INSTALLATION: As easy as installing a door bell!

OXYGEN, TEMPERATURE and pH: OxyGuard OxyGuard systems can also be used to measure, monitor and control temperature and pH as well as oxygen - mixed in the same system.

GALVANIC ISOLATION: Each input is galvanically isolated from all other circuits. This ensures good noise immunity and reliable measurement.


Construction: Plastic enclosure with power supply, terminals, display with selector switch and one plug-in transmitter per channel. Power supply for OxyGuard 8 is separate.
Dimensions: bxdxh = 36 x 14.5 x 31 cm. Power supply for OxyGuard 8: 18.5 x 10 x 14 cm
Weight: 5 kg. Power supply 3.5 kg.
Supply: Either 220/240 VAC, 110 VAC, 24 VAC, 12 VDC or 24 VDC. OxyGuard 8 unit itself 24 VDC from power supply.
Operating Conditions: -10 to +40°C. Enclosure rated IP55/Nema 4
Inputs: 6 or 8 inputs for signals from DO or temperature probes and pH local transmitters. Inputs galvanically isolated from each other and from the rest of the circuits
Outputs: 4-20 mA for each channel, galvanically isolated from inputs.
One Control relay output for each channel
Common low alarm relay outputs - two changeover contacts
Common high alarm relay outputs - two changeover contacts
One Low alarm relay output for each channel
All relay outputs are potential free (dry) changeover contacts.

For probe details please see the brochure for the OxyGuard Probe.

Ordering Information

OxyGuard 6: A016n where n is the number of channels desired. Complete with integrated power supply.
OxyGuard 8: A018n where n is the number of channels desired. Power supply for 230 volt mains: A06DC230, Power supply for 110 volt mains: A06DC110

Please contact Aquamerik if you want measure temperature and/or pH as well as oxygen.



A new concept for measurement and control:

  1. Unsurpassed overview and security.
  2. Easy to optimize operation - both of daily production and strategic operation.
  3. Add measurement and control anywhere, any time just plug a new unit into the data link!
  4. Access the system from anywhere! If you're in the field just connect a PC to the data link - If you're in the office just use the nearest PC - If you're further away use the internet!
  5. Only a single data cable for all signals right up to the point of measurement!
  6. Radio link for even more freedom and flexibility and it can run on solar cells!
  7. Range of units for easy system construction just add a unit for more measurement and control.
  8. Easy integration with other systems link measurement and control with other functions - feeding - illumination etc.

An Introduction to the System

The OxyGuard Commander is a water quality metering, monitoring and control system with practically unlimited capabilities. Commander combines newly designed input and output units and software with a tried-and tested bus network to provide both small and large users with a very economic solution that is easily and precisely adapted to their exact needs. The various Commander input and output units and the flexibility of its software enable it to be used for most metering, monitoring and control functions found in a modern aquaculture facility.

Instead of individual cables, the parts of a Commander system are connected together by a single data cable. The cable is just 6 mm thick, and has only four cores plus screen. This fieldbus, as it is called, carries all input and output signals, so to build up a system you just connect the units you need to the same one cable. Commander components include input units, output units, an alarm unit, a radio link unit, a master unit and PC software. The bus network also permits other equipment (e.g. flowmeters, level sensors) to be integrated into the system.

Commander Systems can, just like the traditional OxyGuard multi-channel systems, be extended and adapted, but the Commander provides possibilities far beyond the scope of any traditional system. There is no limit to the number of channels that can be incorporated - just add the units you need - and the system can be divided into sections that will function alone even if connection to the rest of the bus network is broken. Wiring is greatly reduced since input and output units can be placed close to where the actual measurements are made or to where control is effected.

Via a PC running the main Commander program connection is possible both to other fieldbus systems and other computers. The latter can be performed through the office network or through the internet. A Commander System can thus become a part of the overall data system of the fish farm or mother company, enabling operation to be finely tuned to market demand trends to give a strategic advantage.

Making a Commander system is easy. You start with a Master Box containing a Master Unit, field bus communication unit, data log unit or units as well as a power supply and battery back up. DO Meters are added as needed, connected to the Master Box by the field bus cable. An Output Box or boxes containing output units connected to magnetic valves will provide oxygen dosing. All this forms a section large enough for many installations. A field bus connection to a main PC provides the user interface.

You can add units - or whole sections - as you need. Use the radio link to transmit data where a cable connection is inappropriate. Large systems can be divided into independent sections, each with its Master Box. The performance of one section will not be affected by whether or not any other section is switched off or disconnected for any reason.

Commander incorporates a number of improvements representing state-of-the-art in DO measurement and water quality control. These are outlined in the Download Productinformation.


Oxyguard - 1 probe
2,317.00 $
Oxyguard - 1 probe
3,186.00 $
Oxyguard - 2 probes
4,918.00 $
Oxyguard - 4 probes
6,668.00 $
Oxyguard - 6 probes
8,418.00 $
Oxyguard - Transformer - 12 VDC power supply
193.60 $
Stationary OxyGuard probe
600.80 $
Oxyguard - Extra cable for probe ($/ meter)
6.25 $
Last Update: May 9, 2006
Prices are in canadian dollars and can change without notice.

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