Oxygen Probe with Two Analog Outputs for O2 and Temperature

OXYBase® WR-RS485M-2CS

The OXYBase® WR-RS485M-2CS combines a wide range optical sensor (type PSt3) and the electro-optical module in one probe. The sensor 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. Therefore, this waterproof probe is ideally suited for measurements in aquaculture or environmental research. The probe can be connected directly to a control unit. It 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, environmental research
  • Communication via RS485 (Modbus)
  • Available with various cable lengths
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 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.****
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: 106 mm, probe diameter: 12 mm; various cable lengths available
Weight Approx. 200 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)

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