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. 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
Get a quote Place an order


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.


*at 20 °C, 960 - 980 hPa; humidified gas mixture
**determined changing from 20.9 % oxygen gas to nitrogen 5.0
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.
CompatibilityGas phase only!
Cross-sensitivity toOrganic solvents, such as pure acetone, toluene, chloroform or methylene chloride
Chlorine gas
Storage stability of sensor cap5 years provided the sensor material 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 + 40 °C
Max.: - 20 °C to + 60 °C
Temperature range storageOptimal: room temprature (+ 20 °C ± 5  °C)
Max.: 0 °C to + 70 °C
Pressure resistance10 mbar up to 12 bar
DimensionsMax. immersion depth: 120 mm / 225 mm / 325 mm / 425 mm
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) or
RS485 Modbus RTU
Analog output4 - 20 mA (current sink)

Related products

VP8-BT ST Cable with Bluetooth Module for OXYPro®

This accessory for OXYPro® allows controlling oxygen…

PreSens Wireless Studio running on a smartphone

PreSens Wireless Studio

PreSens Wireless Studio is a mobile app that allows…

Oxygen Exchange Cap OEC-PSt9-NAU for OIM & OXYPro®

Oxygen Exchange Cap OEC-PSt9-NAU

A PSt9 sensor is integrated in a stainless steel cap, which…

OXYPro® NPT Process Connection Adapter


This adapter has a NPT 1/2 thread and is made of PVDF. With…

OXYPro® FTM Metal Flow-thrrough Connector


The OXYPro® FTM is a metal flow-through connector that can…

OXYPro® Triclamp Adapter

OXYPro® Triclamp Adapter

The Triclamp Adapter is an accessory that allows to safely…

OXYPro® Varivent Adapter

OXYPro® Varivent Adapter

This process connection adapter enables integration of the…

Adapter for 25 mm ports OAD-25

Adapter for 25 mm Ports OAD-D25

All PreSens OXYPro® series probes and Oxygen Probes for…

Handheld USB-QR Barcode Scanner for fast sensor calibration

Handheld USB-QR Barcode Scanner

This handheld scanner can simply be connected to your PC via…


Presens TV

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

All videos