Shallow Water pH Logger


  • Item nr.: APHOX-L-PH
  • Broad range of optical pH sensors
  • Operation up to 100 m depth
  • Stand-alone logging up to >1 year
  • Integrated fast temperature sensor

pH Logger for Shallow Water

The AquapHOx-L-pH is a pH long-term logger for standalone underwater operation. The POM housing enables measurements down to 100m depth. The logger was designed as platform to be combined with a wide range of different optical pH or temperature sensor formats, offering maximum flexibility regarding application.

Our entire pH sensor portfolio utilizing the SUB-connector can be used with the AquapHOx-L-pH. Maintenance time is minimized by simply exchanging these disposable sensor heads. Choose between a pH sensor cap (PHCAP-PKx-SUB) for long time monitoring or fiber-optic sensors (PHROBSC-PKX-SUB) for pH sensing with spatial resolution in e.g. coral reefs. The pH sensors are available with different pH ranges suitable for your application.

Simultaneous oxygen monitoring can be realized by parallel deployment of the AquapHOx-L-O2 logger. For deployments >200m depth, please refer to our deep-sea logger AquapHOx-LX with titanium housing. 

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

Supported analytes. This meter features ONE optical channel compatible to a broad range of optical pH and temperature sensors with SUB-connectors. The optical sensor of your choice must be purchased separately. Each optical sensor is automatically temperature compensated via an integrated fast NTC thermistor.

Stand-alone logging. Log your data (up to >1 year) without a connection to a PC with this stand-alone long-term logger. After the experiment, download the data with our included versatile Windows software for data processing. The integrated maintenance-free lithium battery is then recharged within <2 hours for the next deployment.

Huge data memory. This device comes with a built-in data memory of 4GB of industrial grade for ca. 40 million data points, offering virtually unlimited data memory even during long expeditions. 

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

Compatible Sensors with SUB-connector

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

Exemplary Setup


This combination enables:

  • Measurement of pH down to 200m
  • Autonomously logging the data

For pH total scale


This combination enables:

  • pH measurements on pH total scale
  • Deployments down to 200m
  • Autonomous logging

Exemplary Setup


This combination enables:

  • Measurement of pH down to 100m
  • Autonomously logging the data

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 11)


For recommended basic calibration of optical pH sensors. Each capsule results in 100mL calibration buffer 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

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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