O2 Sensor Transmitter for Shallow Water


  • Item nr.: APHOX-T-O2
  • Broad range of optical O2 sensors
  • Operation up to 100 m depth
  • Analog outputs / USB / RS485 / Modbus
  • Up to 40 Hz sample rate

Shallow Water Transmitter for optical O2 Sensors

The AquapHOx-T-O2 is a real-time transmitter for underwater operation down to 100m depth. It offers a great flexibility regarding application, as it can be used with the entire underwater oxygen sensor portfolio with SUB-connector.

Simply exchange the sensor head, choose between different O2 sensor formats. These include oxygen sensor cap for long-time monitoring, fiber-optic micro- & minisensors for oxygen sensing with high spatial resolution in e.g. coral reefs, and ultra-trace oxygen sensor caps for measurements in oxygen minimum zones or de-oxygenation events.

Combined with our (ultra-)high speed sensors, the AquapHOx-Transmitters are ideal tools for fastest O2 water column profiling or eddy covariance measurements.

Simultaneous pH monitoring can be realized by parallel deployment of the AquapHOx-T-pH transmitter. For deployments >100m depth, please refer to our deep-sea multi-analyte transmitter AquapHOx-TX with titanium housing.


POM Housing. This device can be deployed to a depth of 100m.

Digital Interface. A standard RS485 interface provides robust communication even at cable lengths up to several 100m. A USB 2.0 adapter cable is included for "plug and play" configuration / operation with Windows PCs.

Digital Protocol. Modbus RTU or PyroScience protocol (switchable)

Analog output. This device has integrated analog outputs (2x 0-5V, 2x 4-20mA (16 bit each)).

Broadcast Mode. A broadcast mode can be configured, where the device triggers itself periodic measurements with up to 40 Hz sample rate. The measurement results are given in real time at the analog outputs. No digital communication is needed in this mode.

Next generation PC software. The Pyro Workbench is our newest software solution and available as free download in the Downloads tab. Up to 10 PyroScience meters can be operated by the Pyro Workbench at once. It is used for configuring the device, calibrating the sensors, starting the logging, and finally for retrieving the logged data. The sensor readings are displayed numerically and graphically and can be logged in respective data files for further data processing. Additionally, the integrated Pyro Data Inspector features multiple data processing options like drift compensation or calculation of oxygen rates.

Innovative REDFLASH technology. The REDFLASH technology from PyroScience is based on the unique analyte-sensitive REDFLASH sensor materials. The REDFLASH sensor materials are excitable with red light and show an analyte-dependent luminescence in the near infrared (NIR). The REDFLASH technology impresses by its high precision, high reliability, low power consumption, low cross-sensitivity, and fast response times. The red light excitation significantly reduces interferences caused by autofluorescent samples. Further, the NIR detection technology significantly reduces interference with ambient light, known from the old blue-light techniques.

This project has received funding from the European Union's Horizon 2020 research and innovation programme SME-2 under grant agreement No 82964


Exemplary Setup

AquapHOx-T-O2 + OXR430-UHS-SUB

This combination enables:

  • Measurement of oxygen down to 200m
  • Ultra high-speed measurements using the retractable fiber oxygen minisensor OXR430-UHS-SUB.

Exemplary Setup


This set-up includes:

  • AquapHOx®-T-O2 with USB cable
  • Accessories

0% O2 Calibration Capsules 


For recommended 0% O2 calibration of optical oxygen sensors. Each capsule results in 50mL calibration solution (PU=10).

Underwater Flow-through-cell


  • For APHOX®-T and APHOX®-L devices
  • Fully submersible
  • Usable in the Field and In-Lab
  • Compatible with all sensor caps with SUB-connector

Transmitter Inline Cable


Transmitter inline cable (pigtail) for custom cable assemblies, ca. 60cm length (Subconn MCIL8F + Locking Sleeve MCDLS-F)

Eddy Covariance Adapter Cable


The APHOX-T-VECTOR cable allows connecting PyroScience AquapHOx Transmitter devices directly with Nortek® Vector acoustic doppler velocimeters. For details refer to the data sheet in the download section.

Underwater Sensor Protection Cage


  • For all APHOX®-L and APHOX®-T shallow water devices
  • Anti-biofouling protection in shallow-water environments
  • Easily replaceable

Underwater Sensor Protection Cap


  • Compatible with all sensor caps with SUB-connector
  • For APHOX®-L and APHOX®-T shallow water devices
  • Protection of sensor caps against biofouling
  • Easily replaceable

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