Oxygen Sensor Cap for Unterwater Meters


  • Sensor screw cap with integrated optical oxygen sensor
  • Fast sensor with low drift
  • For all devices with -SUB connector
  • Minimize maintenance by simply exchanging the cap
  • Negligible drift, >3 years shelf time

The OXCAP-SUB integrates an oxygen sensor spot especially developed for underwater and deep-sea applications. The OXCAP is attached via the PyroScience SUB-connector directly to a compatible read-out device. An additional protective cap makes the OXCAP highly robust against mechanical impact and ideal for long-term monitoring applications. The sensing principle is based on an optical detection method and shows virtually no drift and fast response. 

For profiling applications, we recommend our high-speed sensor cap.

Standard range. This sensor is specified for an optimum measuring range of 0 to 500 hPa oxygen (0 -250% air saturation). However, without specifications, it is possible to measure in up to 1 bar pure oxygen/100% oxygen saturation/100% oxygen. For detailed specifications, see the respective pdf file in the Downloads tab.

Optical isolation. For applications at high ambient light (e.g. direct sunlight, illuminated samples) and in fluorescing / light-sensitive samples, an additional optical isolation (-OI) protection layer is added to the sensor surface to reduce enhanced sensor aging and to avoid interference with the oxygen measurements

Easy calibration. A simple ambient air calibration can be performed with a few clicks (<1 minute for equilibrated setup). For precise oxygen measurements close to 0% we also offer easy-to-use calibration capsules (OXCAL). Simply dissolve the content of one calibration capsule in 50 ml distilled water, wait 10-15 minutes, perform the 0% calibration and start measurements with a calibrated sensor. For detailed calibration recommendations refer to the manual in the downloads tab.

SUB-connector (-SUB). Underwater sensor connector (instead of standard ST-connector) needed for applications with underwater devices.

Good value. This product is a basic sensor for applications with no special requirements (like ultra fast response times, resistance to solvents, low detection limit)

Applications. To get an overview of potential applications and to see our sensors in action, please visit our Applications site!

Price List

0% O2 Calibration Capsules 


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

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

Every PyroScience oxygen meter with a SUB-connector (underwater devices) is compatible to this sensor. Use this link to get a list of all compatible meters. Select additional requirements to find the optimal meter for you and your application!


Exemplary Setup


This combination enables: 

  • Robust oxygen measurements in deep sea
  • Autonomous logging with the AquapHOx-LX Logger

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