Probes for Gaseous & Dissolved Oxygen Monitoring

Mid-Range Oxygen Probe OXYPro® MR & MRM
(max. 0 - 20.9 % O2)

The OXYPro® MR & MRM combine an optical sensor type PSt8 and electro-optical module in one probe. The sensor has a maximum measurement range of 0 - 20.9 % O2, and a detection limit of 0.007 % O2 / 3 ppb. It is integrated in a removable sensor cap (OEC), which can easily be exchanged. The mid-range OXYPro® are ideally suited for applications in the food & beverage sector, e. g. soft drink production or wineries. The exchange caps are not only available in a version safe for food applications, but also with fast response time, for measurements in aggressive environments, or for reduced air bubble formation on the sensor. The OXYPro® 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® MR = PreSens proprietary, OXYPro® MRM = Modbus RTU) and have 4 - 20 mA analog output. 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 - 20.9 % O2, detection limit 0.007 % O2 / 3 ppb
  • Ideal for O2 monitoring in the food & beverage industries
  • Different versions: Food applications, reduced bubble formation, aggressive environments
  • Stands SIP (max. + 140 °C, 1.5 atm) & CIP (+ 80 °C, 2 % NaOH)
  • Simple integration due to standard PG 13.5 thread
  • Communication via RS485 (PreSens proprietary, 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.

Process Control in the Beverage Industries

Even low oxygen concentrations influence shelf-life and the taste of certain beverages. Due to the extraordinary low detection limits and outstanding accuracy of the OXYPro® MR and OXYPro® TR, the quality of oxygen-sensitive products such as beer, wine and soft drinks can be secured. With OXYPro® certain processes can be monitored and controlled. As the probes are autoclavable, stand SIP and CIP they are ideally suited for application in the beverage industries.

Monitoring Industrial Processes

The OXYPro® series probes are designed for harsh measurement conditions. 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. tubes or vessels.


Specifications Gaseous & Dissolved O2 Dissolved O2
*at 20 °C, 960 - 980 hPa; humidified gas mixture
**after customized calibration
***determined changing from 10 % oxygen gas to nitrogen 5.0
****determined changing from air-saturated water to a freshly prepared 1 % sodium sulfite solution
*****not for OEC-PSt8-NAU-OIW; this sensor cap cannot be sterilized or autoclaved
Measurement range* Optimal: 0 - 10 % O2, 0 - 100 hPa
Max.**: 0 - 20.9 % O2, 0 - 200 hPa
Optimal: 0 - 4.5 mg/L
Max.**: 0 - 9 mg/L
Limit of detection* 0.007 % O2,   0.07 hPa 3 ppb
Resolution* 0.007 % O2 ± 0.002 % O2
2.314 % O2 ± 0.007 % O2
3 ppb ± 1 ppb
1000 ppb ± 3 ppb
Response time (t90) < 10 sec.*** < 30 sec.****
Compatibility Aqueous solutions
No cross-sensitivity to pH 1 - 14, CO2, SO2, ionic species
Cross-sensitivity to Organic solvents, such as 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 %
Ethanol, methanol, cleaning agents at room temperature
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
Accuracy of temperature measurement ± 1 °C in operation temperature range (0 °C to + 50 °C)
Power supply 7 - 24 V DC
Power consumption in active mode Max. 1 W
Power consumption in stand-by mode

0.15 W

Temperature range operation Optimal: 0 °C to + 50 °C
Max.: - 10 °C to + 90 °C
Storage conditions Optimal: room temperature (+ 20 °C ± 5 °C)
Max.: 0 °C to + 70 °C, 80 % rel. humidity
Pressure resistance at 20 °C - 1 bar to + 12 bar
Dimensions 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 material Stainless steel 1.4435
Surface quality of steel Ra < 0.4 μm (N5)
Wetted part Stainless steel 1.4435, silicone, EPDM
Weight 100 g
Digital interface RS485 half-duplex (variable Baud rate, default: 19200, data bits: 8, parity: none, stop bits: 1, handshake: none) or
RS485 Modbus RTU
Analog output 4 - 20 mA (current sink)

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