Flexible-Analyte Deep Sea Transmitter


  • Measurements with 40 Hz possible
  • For profiling and eddy covariance set-ups
  • Broad range of pH, O2 & temp. sensors
  • Analog outputs / USB / RS485 / Modbus
  • Operation up to 4000 m depth

Deep-Sea Transmitter for pH, O2 or optical Temp. Sensors

The AquapHOx-TX is a transmitter for underwater operation down to 4000m depth. It can be used with a wide range of optical O2-, pH- or temperature sensors, offering maximum flexibility regarding application. Combined with our high-speed sensors, the AquapHOx-Transmitter is a suitable tool for fast profiling or eddy covariance measurements.

For applications which do not require a titanium housing for deep-sea measurements, please refer to our shallow-water transmitters for pH and O2

Supported analytes. This meter features ONE optical channel compatible to a broad range of optical O2, pH, and temperature sensors with SUB-connectors. The optical sensor of your choice must be purchased separately. Each optical sensor is automatically temperature compensated by the integrated fast Pt100 sensor head.

Titanium Housing. This device can be deployed to a depth of 4000m.

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. This software can be used for setting up the meters and calibrating the sensors. The sensor readings are displayed numerically and graphically and can be logged in respective data files for further data processing.

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


Choose between our pH, O2 and optical Temperature Sensors

There are several optical sensors compatible to this read-out device. Select additional requirements to find the optimal sensor for your application!


  • Fast oxygen profiling with the high-speed OXCAPG-HS-SUB sensor cap
  • Deployment down to 4000m

AquapHOx-TX + OXR430-UHS-SUB

Choose the deep-sea transmitter with the retractable fiber oxygen minisensor with ultra-high speed OXR430-UHS-SUB


This combination enables:

  • Measurement of pH total scale down to 4000m
  • Simple exchangeable sensor cap PHCAP-PK8T-SUB

Calibration Capsules (pH 2)


For obligatory acid calibration of optical pH sensors. Each capsule results in 100mL calibration solution (PU=10).

Calibration Buffer Capsules (pH 10.0)


For recommended basic calibration of optical pH sensors. Each capsule results in 100mL calibration buffer solution (PU=10).

0% O2 Calibration Capsules 


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