Efficient combination pH & ORP sensors without added complexity

M4 Knick combo pH and ORP sensors provide two critical measurements in one rugged design. Engineered for reliability and powered by Memosens technology, they simplify installation, reduce calibration time, and support consistent performance across a wide range of industrial applications.

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pH & ORP 
Sensors 
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CIP/SIP Capable
SE 554 AMSN Memosens ph/ORP Sensor

SE554 AMSN

pH & ORP Combination Sensor for Dirty Applications
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
SE 555 AMSN

SE555 AMSN

All-Purpose Memosens pH & ORP Combination Sensor
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
PL-PETR Analog pH & ORP Sensor

PL PETR

Analog pH & ORP Combination Sensor for Dirty Applications
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
pH & ORP 
Sensors 
SE 554 AMSN Memosens ph/ORP Sensor

SE554 AMSN

pH & ORP Combination Sensor for Dirty Applications
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…266°F
Pressure: 0…145 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
SE 555 AMSN

SE555 AMSN

All-Purpose Memosens pH & ORP Combination Sensor
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…275°F
Pressure: -14.5…87 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
PL-PETR Analog pH & ORP Sensor

PL PETR

Analog pH & ORP Combination Sensor for Dirty Applications
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Learn More
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV
Temp: 32…266°F
Pressure: 14.5…180 psig
pH Range: 0…14
ORP Range: -1,500…1,500 mV

Combined pH and ORP measurement without compromise

M4 Knick combo pH and ORP sensors deliver two critical measurements in one compact solution, ideal for processes where space, installation time, or maintenance access is limited. You get reliable data without sacrificing accuracy or durability.

  • Engineered for efficiency in harsh environments
  • Smart digital technology simplifies maintenance
  • A practical choice for streamlined process control


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 sensor, a static holder, and an optional transmitter. The ELL is stocked in the US for quick shipment to keep your operations moving.

pH & ORP Sensor Resources

Glass v. ISFET: Where It Matters

Choosing between a glass and an ISFET pH sensor depends largely on the mechanical demands and hygienic requirements of the process.

How Long Should a pH Sensor Last?

Though no sensor lasts forever, operations should not have to replace sensors faster than they can afford.

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.