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Digital pH sensor Orbipac CPF81D

Memosens compact electrode for wastewater, primaries and metal industries

Orbipac CPF81D is the digital, simple solution for harsh environments. It measures reliably and accurately even in fibrous media and at high flow rates. With its integrated assembly, the electrode saves space and time during flow or immersion installation. Thanks to Memosens digital technology, CPF81D combines maximum process and data integrity with simple operation. It resists corrosion and moisture, enables lab calibration and facilitates predictive maintenance.



  • Suitable for flow and immersion installation
  • Long time stable: Second electrolyte bridge for better protection against electrode poisoning ions such as S2- or CN-
  • Robust polymer housing protects against mechanical damage
  • Optional flat membrane suitable for high flow rates and fibrous media
  • Maximum process safety through non-contact inductive signal transmission
  • Enables predictive maintenance due to storage of sensor and process-specific data
  • Reduced operating costs due to minimized process downtime and extended sensor lifetime

Field of application

Orbipac CPF81D is the robust pH sensor for processes in mining industries and treatment of industrial water and wastewater. It monitors:

  • Flotation
  • Leaching
  • Neutralization
  • Inlet and outlet

Features and specifications

Measuring principle

Glass electrode


Flotation, leaching, neutralization, outlet monitoring


Resistent against electrolyte poisoning and dirt repellent gel-electrode including process connection NPT 3/4"

Measurement range

pH 0 to 14

Measuring principle

Gel-compact electrode with double chamber reference system, kalium nitrate bridge electrolyte and PTFE-diaphragm


Compact electrode in PPS housing with NPT 3/4" process connection


Housing: PPS

pH electrode: lead-free membrane glass

Double chamber reference system: KNO3 and KCl/AgCl


Diameter: 22 mm (0.87 inch)
Length (protcetion guard, long shaft): 150 mm (5.91 inch)
Length (flat membrane): 140 mm (5.51 inch)

Process temperature

Version LH: 0 to 110 °C (32 to 230 °F)

Version NN: 0 to 80 °C (32 to 170 °F)

Process pressure

1 to 10 bar abs at 80 °C
(15 to 145 psi at 176 °F)

Temperature sensor


Ex certification

(optional) FM IS NI Cl. I Div.1&2, Groups A-D


Memosens plug

Ingres protection





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