Wide Body Sensor for Water and Wastewater PH21

At Yokogawa, we are committed to our responsibility of protecting the environment, and this sensor is the first step to achieving a zero emission future. The PH21 is the first pH sensor made from recycled PPS-GF40 materials without compromising the sensor body integrity. The PH21 was designed with the drinking water market in mind, where simplicity results in accuracy and reliable pH measurement, making this sensor an excellent choice in 80% of water-based applications.

Features and Benefits

  • Available as analog and digital SMART sensors (SENCOM)
  • Integral Pt1000 element for accurate temperature measurements and enhanced pH accuracy
  • Quick disconnect Variopin connector 
  • Simple maintenance by comprehensive design
  • Versatile Direct in-line, immersion, off-line installation (flow fitting) and retractable Hot-tap 
  • Quick-Release adapter available
  • Calibration certificate delivered with each sensor


Conventional SMART sensors come with integrated electronics on top of an analog sensor. Once the sensor reaches the end of its lifetime, the still functioning electronics must also be thrown away, adding to global waste. The SENCOM 4.0 platform consists of a reusable SMART adapter, requiring only the analog sensor to be disposed of when it reaches the end of its lifetime. With the SENCOM 4.0 platform, Yokogawa delivers reduced costs and waste while contributing to its long-term business goals of a sustainable future for all.

SA11Digital SMART SENCOM™ Adapter, SA11

The re-useable smart adapter, SA11, offers full measuring parameter functionality of analog sensors equipped with a Variopin connector and Yokogawa ID chip. The SA11 automatically recognizes the installed sensor and prepares the right configuration. 

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Descripción General:

The lifetime of a pH sensor has a significant impact on the overall annual costs of a pH measuring loop. Optimizing four key factors will decrease these costs and optimize process control and overall plant efficiency.


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