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Wide Range Oxygen Probe for Direct Connection to Control Unit
OXYBase® WR-RS232
The OXYBase® WR-RS232 combines an optical sensor type PSt3 and electro-optical module in one probe. The optical sensor has a maximum measurement range of 0 - 100 % O2, and a detection limit of 0.03 % O2. This probe is waterproof and can be submerged completely so it is ideally suited for e. g. environmental research applications, aquaculture, and measurements in sewage. It is connected directly to the control unit and uses RS232 as digital interface (PreSens proprietary). A serial communication protocol is offered for data exchange between the probe and a PC or other host unit. For initial operation the PreSens EOM-STS software can be used. The probe's sensor is integrated in a removable sensor cap (OEC). These exchange caps are available in different versions for certain demands (fast response time, safe for food applications, for measurements in aggressive environments, USP Class VI compatible). The sensor is not autoclavable.
- Maximum measurement range of 0 - 100 % O2, detection limit 0.03 % O2
- Ideal for e. g. environmental research, aquaculture, sewage
- Waterproof
- Communication via RS232 (PreSens proprietary)
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 mixture **after customized calibration ***determined changing from 20.9 % oxygen gas 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 ± 0.2 % 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 | Chlorine gas Organic solvents such as pure acetone, toluene, chloroform or methylene chloride | |
| 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 waster) | |
| 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 | 5 ± 0.5 V | |
| Power consumption in active mode | max. 1 W | |
| Power consumption in stand-by mode | < 0.15 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.: 0 °C to + 70 °C | |
| Pressure resistance* | 3 bar | |
| Dimensions | Probe length: 81.4 mm, diameter: 12 mm | |
| Probe housing material | Stainless steel SUS 316 L | |
| Weight | 132 g (with 5 m calbe length); depends on cable length | |
| Digital interface | RS232 (PreSens proprietary) | |