Robust, low-maintenance pH sensors you can rely on

From glass to non-glass, hygienic to rugged, our Memosens pH sensors provide stable, accurate measurements across all industries, with fewer calibrations and longer life.

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pH 
Sensors 

Temperature Range:
Temperature Range: - slider
-4°F284°F
Ex Approvals
CIP/SIP Capable
Non-Glass
Conductivity Range
Refillable Electrolyte
SE555 Memosens pH Sensor

SE555

All-Purpose pH Sensor
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Learn More
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
SE554 pH Sensor

SE554

pH Sensor for Liquids with Suspended Solids
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
Learn More
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
SE571 pH Sensor

SE571

pH Sensor for Oily Liquids or Suspended Solids
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
Learn More
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
SE515 pH Sensor for Water

SE515

pH Sensor for Water
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
Learn More
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
SE 547 ISFET pH Sensor

SE547

ISFET pH Sensor for Hygienic & Sterile Applications
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
Learn More
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
SE557 pH Sensor

SE557

pH Sensor for High-Precision Measurements
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Learn More
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
SE558 Memosens pH Sensor

SE558

pH Sensor for Low Conductivity Liquids
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
Learn More
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
PL H-93 Memosens pH Sensor

PL H-93

pH Sensor for High Alkaline Liquids
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
Learn More
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
SE 560 Memosens pH Sensor with Refillable Electrolyte Vessel

SE560

pH Sensor for Low Conductivity & Temperature
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Learn More
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Type 18 pH Sensor

Type 18

pH Sensor for Aggressive Liquids
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14
Learn More
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14
pH 
Sensors 
SE555 Memosens pH Sensor

SE555

All-Purpose pH Sensor
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Learn More
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Temp Range: 32…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
SE554 pH Sensor

SE554

pH Sensor for Liquids with Suspended Solids
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
Learn More
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
Temp Range: 32…266°F
Pressure Range: 0…145 psig
pH Range: 0…14
SE571 pH Sensor

SE571

pH Sensor for Oily Liquids or Suspended Solids
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
Learn More
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
Temp Range: 23…266 °F
Pressure Range: 0…174 psig
pH Range: 0…14
SE515 pH Sensor for Water

SE515

pH Sensor for Water
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
Learn More
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
Temp Range: 23…176 °F
Pressure Range: 0…58 psig
pH Range: 0…14
SE 547 ISFET pH Sensor

SE547

ISFET pH Sensor for Hygienic & Sterile Applications
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
Learn More
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
Temp Range: 5…275°F
Pressure Range: -2.9…145 psig
pH Range: 0…14
SE557 pH Sensor

SE557

pH Sensor for High-Precision Measurements
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Learn More
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
Temp Range: -4…275°F
Pressure Range: -14.5…87 psig
pH Range: 0…14
SE558 Memosens pH Sensor

SE558

pH Sensor for Low Conductivity Liquids
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
Learn More
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
Temp Range: 23…212 °F
Pressure Range: -14.5…43 psig
pH Range: 0…14
PL H-93 Memosens pH Sensor

PL H-93

pH Sensor for High Alkaline Liquids
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
Learn More
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
Temp Range: 32…275°F
Pressure Range: 14.5…174 psig
pH Range: 0…14
SE 560 Memosens pH Sensor with Refillable Electrolyte Vessel

SE560

pH Sensor for Low Conductivity & Temperature
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Learn More
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Temp Range: -4…212 °F
Pressure Range: -14.5…43.5 psig
pH Range: 0…14
Type 18 pH Sensor

Type 18

pH Sensor for Aggressive Liquids
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14
Learn More
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14
Temp Range: 32 … 284°F
Pressure Range: -14.5…214 psig
pH Range: 0 … 14

A pH sensor range that fits your process

Whether you’re monitoring high-purity water or handling aggressive slurries, M4 Knick offers a pH sensor range built to fit your exact process conditions. Our sensors combine durable materials, specialized pH glass formulations, and Memosens digital technology to ensure stable performance in even the most demanding environments.

  • Options for every application: inline, online, and offline
  • Wide chemical compatibility with sensor glass and non-glass options
  • Memosens digital technology for secure signal transmission and simplified calibration

pH Saving Calculator

Calculate your return on investment when using Knick Memosens pH Sensors

ELL: Ready-to-Install pH Loop for Basic Applications

The ELL is a complete, preassembled digital pH measurement system designed for simple water and municipal processes. It includes a reliable Memosens SE515 pH sensor, static holder, and transmitter. The ELL is stocked in the US for quick shipment to keep your operations moving.

  • Simple, plug-and-play setup reduces installation time and labor
  • Transmitter available with or without a display
  • Ideal for general water treatment, utility systems, and basic monitoring tasks

pH Resources

5 Lesser-Known Impacts on Accuracy

Process variables like temperature, chemical reactions, and seemingly innocuous factors like sensor orientation all contribute to the reliability of a process's accuracy.

What Happens When a pH Sensor Dries Out? (And How to Fix It)

For glass electrodes, possibly the most important need for long-term sensor health is the hydration of the sensor bulb.

From Beers to Beakers: A Brief History of pH

In this little history lesson, we'll skim through the origins of pH from its conceptual birth all the way to its impact on the modern industrial world.

products

Measurement
Solutions

products

Measurement
Solutions

Technology
Ex Approvals
CIP/SIP Capable
Non-Glass
Conductivity Range
Refillable Electrolyte