Specs at a glance

Measuring range

pH 1-13 (<100µS/cm)
Process temperature

2°C - 75°C
(36°F - 167°F)
Process pressure

max. 3 bar
(43.5 psi)

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Field of application

Purisys CPF201 is the specialist for pure and ultrapure water. Its integrated stainless steel assembly provides stable and flow-independent measurement at lowest conductivities. Purisys ensures optimum water quality and guarantees highest safety of your products or assets.

Boiler feed water
Power plant applications
Pharmaceutical water for injection

Benefits

Stable pH reading and response
Elimination of flow dependency errors
Patented porous PTFE reference junction
Easy installation

Videos

The pH-value of a liquid can be calculated using the potentiometric measurement principle. This video shows what it is about and how this measuring principle works.

Success stories

Advanced bioprocess control

From time consuming sample analysis to real-time monitoring of critical parameters in fermentation processes thanks to complete solutions from hardware to development and analytical services.
Read the full story
Conductivity system optimises production of biosurfactants

Holiferm produces sustainable biosurfactants using a patented gravity separation fermentation process. The company was seeking a way to automate the measurement of the critical phase separation step.
Read the full story
Water/steam circuit at GETEC PARK.SWISS

GETEC SWISS.PARK improves plant efficiency and decreases downtimes thanks to Endress+Hauser SWAS System
Read the full story
Cooling water directly from the Baltic Sea

With the CUS52D, power plant operator KNG benefits from reduced maintenance costs due to reliable, stable measurement even under harsh conditions in salt water.
Read the full story
Lab-based pH calibration presents new possibilities

Beiersdorf uses digital Memosens technology for maximum availability of measuring instruments
Read the full story

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

Measuring principle

Potentiometric
Application

Ultra pure water (<100µS/cm); power plants
Characteristic

Bypass measurement system made of stainless steel with gel electrode and salt storrage for measurements in ultra pure water.
Measuring range

pH 1-13 (<100µS/cm)
Measuring principle

Glass-gel compact electrode with PTFE diaphragm and salt (KCl) storrage
Design

Electrode in stainless steel boundary surface installed in a stainless steel flow assembly for potential free measurements in ultrapure water with lowest conductivity.
Material

Glass, stainless steel
Dimension

Installation on a plate (305 mm x 305 mm).
(11.89 inch x 11.89 inch)
Process temperature

2°C - 75°C
(36°F - 167°F)
Process pressure

max. 3 bar
(43.5 psi)
Temperature sensor

Optional with integrated Pt100 oder Pt1000.
Connection

TOP68 connection head or fixed cable connection.
Ingress protection

IP68

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5 documents

Components sheet

Components Sheet for CPF201 Kit: seal Kit

Components sheet

English version - 01/2026

New version available in English

Components Sheet for CPF201 Kit: seal Kit

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Language:	English
Version:	26/01/2026
File size:	141.4 KB
File name:	Component_Sheet_Kit_51512789_seal_kit_compl.pdf

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Components sheet

Components Sheet for CPF201 Kit: Fitting VA AD6mm

Components sheet

English version - 01/2026

New version available in English

Components Sheet for CPF201 Kit: Fitting VA AD6mm

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Language:	English
Version:	26/01/2026
File size:	135.6 KB
File name:	Component_Sheet_Kit_51512792_fitting_VA_AD_6mm_2pcs.pdf

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Components sheet

Components Sheet for CPF201 Kit: Mounting plate

Components sheet

English version - 01/2026

New version available in English

Components Sheet for CPF201 Kit: Mounting plate

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Language:	English
Version:	26/01/2026
File size:	165.8 KB
File name:	Component_Sheet_Kit_51512788_mounting_plate_with_accessories.pdf

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Components sheet

Components Sheet for CPF201 Kit: Fitting Cover w. Accessoires

Components sheet

English version - 01/2026

New version available in English

Components Sheet for CPF201 Kit: Fitting Cover w. Accessoires

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Language:	English
Version:	26/01/2026
File size:	158.1 KB
File name:	Component_Sheet_Kit_51512795_fitting_cover_with_accessories.pdf

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Components sheet

Components Sheet for CPF201 Kit: Fitting VA 1.4

Components sheet

English version - 01/2026

New version available in English

Components Sheet for CPF201 Kit: Fitting VA 1.4

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Language:	English
Version:	26/01/2026
File size:	139.4 KB
File name:	Component_Sheet_Kit_51512793_fitting_VA_1_4_2pcs.pdf

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Search spare parts by number in drawing

- Show drawing (PDF)

60 spare parts & accessories

Kit CPF201 backplane with accessories

further parts

Order code

51512788
Kit CPF201 complete set of gaskets

further parts

Order code

51512789
Kit CPF201 Fitting VA, OD 6 mm, 2 pcs.

further parts

Order code

51512792
Kit CPF201 Fitting VA, 1/4", 2 pcs.

further parts

Order code

51512793
Kit CPF201 flowcell lid with accessories

further parts

Order code

51512795
Kit CPF 201 spare sensor

further parts

Order code

51512787
Memoclip label memosens cable

Order code

71038229
KCL-Electrolyte solution CPY4

Order code

CPY4-
Technical buffer solution CPY20

Order code

CPY20-

4 products & bundles

4 products

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Optional add-ons

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Individual configuration

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Often bought together

Accessories

Memoclip label memosens cable

KCL-Electrolyte solution CPY4

See more accessories

Analog pH sensorPurisys CPF201

Compact electrode for power and life sciences industries

Specs at a glance

Measuring range

Process temperature

Process pressure

Field of application

Benefits

Videos

Success stories

Advanced bioprocess control

Conductivity system optimises production of biosurfactants

Water/steam circuit at GETEC PARK.SWISS

Cooling water directly from the Baltic Sea

Lab-based pH calibration presents new possibilities

Measuring principle

Application

Characteristic

Measuring range

Measuring principle

Design

Material

Dimension

Process temperature

Process pressure

Temperature sensor

Connection

Ingress protection

Back

Components Sheet for CPF201 Kit: seal Kit

Components Sheet for CPF201 Kit: Fitting VA AD6mm

Components Sheet for CPF201 Kit: Mounting plate

Components Sheet for CPF201 Kit: Fitting Cover w. Accessoires

Components Sheet for CPF201 Kit: Fitting VA 1.4

Back

Kit CPF201 backplane with accessories

Kit CPF201 complete set of gaskets

Kit CPF201 Fitting VA, OD 6 mm, 2 pcs.

Kit CPF201 Fitting VA, 1/4", 2 pcs.

Kit CPF201 flowcell lid with accessories

Kit CPF 201 spare sensor

Memoclip label memosens cable

KCL-Electrolyte solution CPY4

Technical buffer solution CPY20

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Output / communication

Ingress protection

Input

Output / communication

Ingress protection

Input

Output / communication

Ingress protection

Measuring range

Input

Output / communication

Ingress protection

Input

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Ingress protection

Input

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Ingress protection

Measuring range

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Analog pH sensor
Purisys CPF201