Single Channel DO/temperature meter with advanced features
Single Channel DO/temperature meter with advanced features
Atlantic for Aquaculture is an accurate, reliable and easy to use oxygen meter with features ideal for use in aquaculture facilities such as shrimp farms, carp farms and other installations with individual, large ponds. It measures both dissolved oxygen and temperature, and has 4 relay outputs. The dissolved oxygen measurement is compensated for atmospheric pressure, which permits accurate control of aerators.
The user can link set points to parameters as desired. Set points can then be linked to output relays. It is also possible to link set points together. This permits, for example, an aerator to be started both from a DO set point and a temperature set point.
Atlantic has a barometric pressure sensor, and the probe incorporates a temperature sensor. This gives you correct values of dissolved oxygen in both mg/l and % saturation. And you don’t need a separate sensor to measure water temperature.
Atlantic has four relay outputs and 8 set points. There will always be at least one relay output that can be used to give alarm if the oxygen level goes too low or the temperature too high. And since Atlantic measures both parameters and has logical linking you only need to use one relay.
Atlantic has 8 timers that can be used for a number of purposes. For example, alarm can be delayed so that only a sustained fault results in alarm being given.
Often a fixed setting for salinity is sufficient. If measurements are made where the salinity changes then an OxyGuard salinity probe can be connected to give automatic compensation for the actual salinity.
OxyGuard‘s Anti-Fouling Cap reduces membrane fouling significantly. This is specially useful when measuring in warm salt or brakish water, where fouling forms on most surfaces very quickly.
Automatic probe cleaning is achieved using a timer
function and relay output to activate a magnetic valve that
sends compressed air to an OxyGuard probe cleaner.
This is very effective. A second timer is used to “freeze” the
output signal during cleaning.
Just take the probe up, wipe the membrane, hang it in the air, select “Calibrate” and press “OK. Atlantic does the rest. Atlantic will tell you if conditions are unsteady, i.e. if the temperature or oxygen partial pressure is changing.
The OxyGuard probe has the longest possible calibration intervals – up to 3 years in clean air.
Let Atlantic control your aerators automatically. They will then only run when more oxygen is needed. If you also use aerators to create circulation to cool the water you can link set points so that the aerator will run if the DO is too low or if the temperature is too high.
This saves energy by ensuring that the water is only circulated when needed. You can add an extra temperature measurement and let Atlantic check that there is cooler water at depth to mix with the warmer water near the DO/temperature probe.
If surface DO levels are very high – above 100% sat, then propellers are the best choice to send some of this oxygen rich water to lower levels. Using aerators will blow the excess oxygen away.
On the other hand, if DO levels are under 100% then aeration is sensible. You only need one Atlantic to turn aerators on when the water is cool and the DO less than 100% sat, and control propeller circulation when the water warms and the oxygen level is pushed over 100%.
Measurement principle: Oxygen: Galvanic oxygen partial pressure cell, self polarizing, self
temperature compensating. Temperature: Precision NTC
Dimensions: Diameter = 58 mm, length = 59 mm.
Weight: Probe alone 0.2 kg. Probe with 7m cable 0.5 kg.
Connections: Cable, 4 lead, standard cable length = 7 m.
Measurement range: DO 0-200% sat, 0-20 mg/l, O2 vol. 0-25%, other on request. Temp. from – 5°C.
Accuracy: Depends on calibration and conditions. Typically better than +/-1% of value.
Output stability: In air at constant temperature stable to within +/- 1% over 1 year.
Accuracy temperature: +/- 0.3°C.
Operating conditions: 0 to 40°C, pressure to 2 bar. Higher on request. Storage temp.: -5 to +60°C.
Construction: ABS enclosure with display, indicators, pushbuttons and alarm buzzer.
Dimensions & weight: b x h x d: 213 x 185 x 95 mm, 1.2 kg.
Supply & consumption: 230 VAC, 115 VAC +/-10% or 9 to 36VDC. 10 W. Specify when ordering.
Operating conditions: -10 to +50°C. Max. 90% humidity non-condensing. Enclosure IP65.
Storage conditions: -10 to +60°. Max. 90% humidity non-condensing.
Probe inputs: mV for oxygen, NTC for temperature. Scaleable. Choice of units.
Probe input units: Oxygen: mg/l, PPM, %Sat, %Vol,mbar O2.Temperature:°C or °F.
Compensation input: 4-20 mA. Scaleable. Max voltage drop 5V at 20 mA. Can compensate for salinity, pressure, temperature or NTC temperature. Can be used for separate 0-20 or 4-20 mA measurement signal input with units mg/l, PPM, % Sat, % Vol,
°C, °F, mmHg, inHg, mbar O2, PPT, pH.
Analogue input: 4-20 mA. Max. load 820 ohm (total). User selectable range & parameter.
Fully galvanically isolated from all inputs.
Display: Graphical LCD with backlight. Max 4 figures, 2 decimals, 13 mm height.
Conversion accuracy: To display and analogue output < +/- 0.1%.
Non-linearity and repeatability typically < +/- 0.1% of actual value.
Relay outputs: 4, with potential free changeover (SPDT) contacts. Selectable mode (direct or inverted), and linking to parameter or logical argument. Max load 200VA or 1A AC, recommended max 24 VAC (abs. max 250 VAC). 2A at 24 VDC.
Logical functions: Direct, inverted, multiply. With “and” and “not and” linking.
Alarms: 8, variable hysteresis about set point. Selectable parameter, values & linking.
Timers: 8, from 1 second to 9999999 seconds (approx. 115 days). Selectable period, duty cycle and offset. Can activate or be activated by alarm. Can freeze the output. Can activate relays. Can be reset from front panel.