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)
Get a quote Place an order


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.


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.****
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 100 g
Digital interface

RS232 (PreSens proprietary)

Related products

Oxygen Exchange Cap OEC-PSt3-NAU for OXYBase® WR

Oxygen Exchange Cap OEC-PSt3-NAU

The Oxygen Exchange Cap is made of stainless steel and has…

Oxygen Exchange Cap OEC30-PSt3-NAU for OXYBase® WR

Oxygen Exchange Cap OEC30-PSt3-NAU

A wide range PSt3 sensor is integrated in a beveled…



Select by industry

Presens TV

Watch tutorials, webinars and informative videos about PreSens optical sensor systems.

All videos