Probe for Dissolved & Gaseous Oxygen Measurements

Wide Range Oxygen Probe OXYPro® WR, WR-ECS & WRM
(max. 0 - 100 % O2)

The OXYPro® WR & WRM combine an optical sensor type PSt7 and 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 / 20 ppb. It is integrated in a removable sensor cap (OEC), which can easily be exchanged. These exchange caps are available in different versions for certain demands (USP Class VI compatible, fast response time, safe for food applications, for measurements in aggressive environments, reduced air bubble formation). The wide range OXYPro® are ideally suited for application in the biotech sector. They are directly connected to the control unit and have a standard PG 13.5 stainless steel thread for easy integration at the measurement site. As a digital interface these probes use RS485 (OXYPro® WR = PreSens proprietary, OXYPro® WRM = Modbus RTU) and have 4 - 20 mA analog output. Optional ECS output is available also. A serial communication protocol is offered for data exchange between the OXYPro® and a PC or other host unit. For initial operation and adjustment of the 4 - 20 mA output the PreSens EOM-STS software can be used.

  • Maximum measurement range of 0 - 100 % O2, detection limit 0.03 % O2
  • Ideal for O2 monitoring in the biotech sector
  • Different versions: USP Class VI compatible, food applications, reduced bubble formation, aggressive environments
  • Stands SIP (max. 140 °C, 1.5 atm) & CIP (2 % NaOH, + 80 °C)
  • Simple integration due to standard PG 13.5 thread
  • Communication via RS485 (PreSens proprietary or Modbus RTU)
  • 4 - 20 mA analog output
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OXYPro® for Your Bioreactor

This optical oxygen probe can easily be connected to your control system. Precise oxygen measurements enable control and contribute to safe and stable culture conditions. The OXYPro® can be mounted to standard ports, and stand cleaning in place and steam sterilization. No membrane cleaning or replenishment of electrolyte solutions is necessary. A used sensor cap can easily be exchanged, as the sensor can be calibrated with a fast barcode scan. This low maintenance probes reduce the work load considerably.

Monitoring Industrial Processes

The OXYPro® series probes are designed for harsh conditions like high pressure or oil/water mixtures. Additionally they are almost maintenance-free as they do not contain any membranes and electrolytes, so they are ideally suited for monitoring chemical industrial processes or oxygen sensitive applications. They can be used for gaseous or dissolved oxygen monitoring in most different environments, like e. g. gas pipelines or tanks.


SpecificationsGaseous & Dissolved O2Dissolved O2
*at 20 °C, 960 - 980 hPa; humidified test 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
*****not for OEC-PSt7-NAU-OIW, this sensor cap cannot be sterilized or autoclaved
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 mg/L

Limit of detection*

0.03 % O2, 0.3 hPa

0.015 mg/L, 20 ppb
Resolution*1 ± 0.02 % O2
20.9 ± 0.1 % O2
0.4 mg/L ± 0.009 mg/L
9 mg/L ± 0.04 mg/L
Response time (t90)< 10 sec.***< 40 sec.****
CompatibilityAqueous solutions, ethanol, methanol, cleaning agents containing ClO2 at room temperature
No cross-sensitivity topH 1 - 14, CO2, H2S, SO2, ionic species
Cross-sensitivityOrganic solvents, such as pure acetone, toluene, chloroform or methylene chloride
Chlorine gas
Sterilization procedure*****Steam sterilization (max. + 140 °C, 1.5 atm)
Cleaning procedure*****Cleaning in place (CIP, 2 % NaOH, + 80 °C, + 176 °F)
3 % H2O2, acidic agents (HCl, H2SO4) max. 4 - 5 %
Cleaning agents containing ClO2 at room temperature
Storage stability of sensor cap5 years, provided the sensor is stored at room temperature in dry conditions and in the dark
Sampling rate1 sec. up to 9 min. 59 sec.
Temperature sensorNTC
Temperature performanceAccuracy < ± 1 °C
Power supply7 - 30 V
Power consumption in active modeMax. 1 W
Power consumption in stand-by mode0.15 W
Temperature range operationOptimal: 0 °C to + 50 °C
Max.: - 40 °C to + 90 °C
Temperature range storageOptimal: room temperature (+ 20 °C ± 5 °C)
Max.: 0 °C to + 70 °C
Pressure resistance10 mbar up to 12 bar

Max. immersion depth: 120 mm / 225 mm / 325 mm / 425 mm + 7 mm with OEC30
PG 13.5 thread and VP8 connector: 55 mm
Diameter: 12 mm

Probe housing materialStainless steel 1.4435
Surface quality of steelRa < 0.4 µm (N5)
Wetted partStainless steel 1.4435, silicone, EPDM
Weight100 g
Digital interfaceRS485, half-duplex (variable Baud rate, default: 19200, data bits: 8, parity: none, stop bits: 1, handshake: none)
Optional: RS485 Modbus RTU
Analog output4 - 20 mA (current sink)
ECS (optional in product variant OXYPro® WR-ECS-120)

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