Measure Ultra-Low Oxygen Amounts in Gases

Ultra-Trace Oxygen Probe OXYPro® UT & UTM
(0 - 200 ppmv O2)

The OXYPro® UT & UTM combine an optical sensor type PSt9 and electro-optical module in one probe. The sensor has a maximum measurement range of 0 - 200 ppmv O2, and a detection limit of 0.5 ppmv O2. It is for gaseous oxygen measurement only and ideally suited for monitoring oxygen sensitive processes, inertization, or other industrial applications with non-inflammable media. The sensor is integrated in a removable sensor cap (OEC), which can easily be exchanged. 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® UT = PreSens proprietary, OXYPro® UTM = 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 - 200 ppmv O2, detection limit 0.5 ppmv O2
  • Ideal for monitoring O2 sensitive industrial applications
  • Simple integration due to standard PG 13.5 thread
  • Communication via RS485 (PreSesn proprietary, Modbus RTU)
  • 4 - 20 mA analog output
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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.


*at 20 °C, 960 - 980 hPa; humidified gas mixture
**determined changing from 200 ppmv oxygen gas to nitrogen 6.0
Measurement range* 0 - 200 ppmv O2
Limit of detection* 0.5 ppmv O2
Resolution* 1 ± 0.15 ppmv O2, 100 ± 0.8 ppmv O2, 200 ± 1.5 ppmv O2
Response time (t90)** < 10 sec.
Compatibility Gas phase only!
Cross-sensitivity to Organic solvents, such as pure acetone, toluene, chloroform or methylene chloride
Chlorine gas
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 + 40 °C
Max.: - 10 °C to + 60 °C
Storage conditions Optimal: room temprature (+ 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
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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