LabSen 851-S Pre-pressurized pH Electrode


• The low-impedance S membrane ensures a fast response and is yet impact resistant.
• The pre-pressurized structure allows the electrolyte to stably flow out even in highly viscous
samples so as to ensure reliable measurements.
• Blue gel inner solution – does not flow and will not generate air bubbles.

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LabSen 851-S pH electrode is designed for high-accuracy pH measurement of highly viscous samples such as coatings, syrups, resin, glue, and etc.

The pre-pressurized structure allows the electrolyte to stably flow out even in highly viscous samples so as to ensure reliable measurements.

LabSen S-type glass membrane – fast response and is 10 times stronger than traditional glass membranes, saving the electrode from accidental damage.

The electrode uses a BNC connector, compatible with any pH meters that use BNC connectors. No temperature sensor is built-in. Users need to have a separate temperature probe (ex: Apera MP500) to enable ATC or manually input temperature to realize temperature compensation.


We warrant this electrode to be free from defects in material and workmanship and agree to repair or replace free of charge, at the option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS, LLC for a period of SIX MONTHS from the delivery.

This limited warranty does NOT cover any issues due to:

  • Accidental damage
  • Improper use
  • Normal wear and tear
  • Transportation
  • Storage
  • Failure to follow the product instructions
  • Unauthorized maintenance, modifications, combination or use with any products, materials, processes, systems or other matter
  • Unauthorized repair
  • External causes such as accidents, abuse, or other actions or events beyond our reasonable control.


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Technical Specifications

  • Proprietary sensor technology and premium materials from Switzerland
  • The low-impedance S membrane ensures a fast response and is yet impact resistant.
  • Pre-pressurized reference system for smooth electrolyte flow
  • Silver Ion Trap Reference System ensures a stable reference potential and long service life.
  • Lead-free glass body
  • Material: Lead-free glassTemp. Sensor: NoJunction: Pre-pressurized ceramicReference: Silver Ion TrapElectrolyte: Gel KCL

    Length: 120mm

    Diameter: 12mm

    Membrane Shape: Hemispherical

    Membrane Resistance: <150MΩ

    Range: 0-14 pH

    Temp. Range: -5 to 100°C (32 to 212°F)

    Connector: BNC

    Cable: 3 Ft

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LabSen 851-S Pre-pressurized pH Electrode

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