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Oxygen Probe for Measurements in Salt Water
OXYBase® WR-RS485M-2CS-SW
The OXYBase® WR-RS485M-2CS-SW has a maximum measurement range of 0 - 100 % O2, and a detection limit of 0.03 % O2. With two current source analog outputs the probe can transmit oxygen as well as temperature values measured with the integrated temperature sensor. The probe is waterproof and has additional plastic cover that makes it more resistant to environmental effects. Therefore, it is ideally suited for measurements in aquaculture or environmental research. It can be connected directly to a control unit and uses RS485 as digital interface (Modbus). Using a special adapter the probe can be connected to a PC for initial operation and adjustment of the 4 - 20 mA (current source) outputs with the free PreSens EOM-STS software. The probe is available with various cable lengths, and the optical sensor is integrated in a removable cap (OEC), which can easily be exchanged.
- Maximum measurement range of 0 - 100 % O2, detection limit 0.03 % O2 / 20 ppb
- 2 current source 4 - 20 mA outputs for O2 & temperature
- Waterproof (current source)
- Ideal for e.g. aquaculture, ecological research
- Communication via RS485 (Modbus)
- Available with various cable lengths
Applications
Oxygen Monitoring in Aquaculture
OXYBase® are the solution to control dissolved oxygen in aquaculture. The robust probes can be connected to control units so ideal water conditions can be assured, thus also helping to increase yield. OXYBase® are real low-maintenance probes, as a used sensor can simply be replaced by changing the OEC at the probe tip.
OXYBase® in Biological & Environmental Research
OXYBase® are long-term stable probes that can be implanted in soil or other samples for prolonged time periods. They are ideally suited for long-term monitoring of e. g. soil aeration processes, which are very critical for plant productivity, or dissolved oxygen measurements in water samples.
Technical
| Specifications | Gaseous & Dissolved O2 | Dissolved O2 |
|---|---|---|
| *at 20 °C, 960 - 980 hPa; humidified gas mixtures **after customized calibration ***determined changing from 20.9 % oxygen to nitrogen 5.0 ****determined changing from air saturated water to a freshly prepared 1 % sodium sulfite solution | ||
| Measurement range* | Optimal: 0 - 50 % O2, 0 - 500 hPa Max.**: 0 - 100 % O2, 0 - 1000 hPa | Optimal: 0 - 22.5 mg/L Max.**: 0 - 45.0 mg/L |
| Limit of detection* | 0.03 % O2, 0.3 hPa | 0.020 mg/L |
| Resolution* | 1 % O2 ± 0.02 % O2 20.9 % O2 ± 0.1 % O2 | 0.4 mg/L ± 0.009 mg/L 9 mg/L ± 0.04 mg/L |
| Response time (t90) | < 10 sec.*** | < 30 sec.**** |
| Properties | ||
| Compatibility | Aqueous solutions, ethanol, methanol, cleaning agents containing ClO2 at room temperature | |
| No cross-sensitivity to | pH 1 - 14, CO2, H2S, SO2, ionic species | |
| Cross-sensitivity to | Organic solvents such as pure acetone, toluene, chloroform or methylene chloride Chlorine gas | |
| Cleaning procedure | 3 % H2O2, acidic agents (HCl, H2SO4) max. 4 - 5 % Cleaning agents containing ClO2 at room temperature | |
| Calibration | Two-point calibration in oxygen-free (e.g. nitrogen 5.0, 1 % sodium sulfite solution) and air-saturated environment (20.9 % oxygen, air-saturated water) | |
| Storage stability of sensor cap | 5 years provided the sensor material is stored at room temperature in dry conditions and in the dark | |
| Sampling rate | 1 sec. up to 9 min. 59 sec. | |
| Temperature sensor | NTC | |
| Temperature performance | Accuracy < ± 1 °C | |
| Power supply | Min. 6 - 30 VDC (min. VDC depends on cable length) | |
| Power consumption in active mode | Max. 3 W | |
| Power consumption in stand-by mode | 0.6 W | |
| Temperature range operation | Optimal: 0 °C to + 40 °C Max.: - 10 °C to + 70 °C | |
| Temperature range storage | Optimal: room temperature (+ 20 °C ± 5 °C) Max.: - 10 °C bis + 70 °C | |
| Pressure resistance | 3 bar | |
| Dimensions | Probe length: 166 mm, probe diameter: 21.1 mm at cable gland | |
| Housing Material | Housing: Stainless steel SUS 316 L Housing cover: POM | |
| Weight | 312 g (with 5 m cable length); depends on cable length | |
| Digital interface | RS485 (Modbus) | |
| Analog output | Two individually configurable 4 - 20 mA current outputs: Output range 4 - 20 mA, max. load 800 Ohm, galvanically isolated, common ground source (GNDA) | |