pH Sensor Cap for Underwater Devices


  • Robust optical pH sensor caps (4 pcs.) 
  • For all devices with -SUB connector
  • Minimize maintenance by simply exchanging the cap
  • Measurement range pH 6.0-8.0
  • Minimal cross-sensitivity to high ionic strength

The PHCAP represents a new generation of optical pH sensors from PyroScience and a viable alternative to traditional electrochemical sensors.

The PHCAP is attached via the PyroScience SUB-connector directly to a compatible read-out device. An additional protective cap makes the PHCAP highly robust against mechanical impact and ideal for long-term monitoring applications. 

The PHCAP integrates a pH sensor spot and allows measurements between pH 6.0 and 7.0. It is based on an optical detection principle and therefore does not require a reference electrode, leading to a minimized effect of high ionic strength thus making it to a suitable sensor solution for long-term measurements especially in seawater. 

pH range 6.0-8.0 This sensor is specified for the pH range 6.0-8.0. For detailed specifications, see the respective pdf file in the Downloads tab.

Optical isolation.This sensor type is equipped with an additional optical isolation protection layer. This layer reduces enhanced sensor aging and interference with the measurements in applications at high ambient light (e.g. direct sunlight, illuminated samples) and in fluorescing / light-sensitive samples.

Easy calibration. Calibration of the pH sensors is performed at pH 2 and pH 11 using our easy-to-use calibration capsules (PHCAL2 and PHCAL11). For detailed calibration recommendations, please 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.

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

Price List

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 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 pH 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: 

  • pH measurements in deep sea
  • Autonomous logging with APHOX-LX

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