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Digital pH sensor Memosens CPL51E

Robust Memosens 2.0 pH sensor for laboratory measurement and random sampling in the field

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Digital pH sensor Memosens CPL51E

Robust Memosens 2.0 pH sensor for laboratory measurement and random sampling in the field

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Benefits

  • The inductive Memosens sensor connection is insensitive to moisture and corrosion.
  • Suitable for use in the laboratory or in the field to check your running process. A physical protection keeps the glass membrane safe in both environments.
  • Automatic temperature compensation thanks to integrated temperature sensor.
  • Fast response time even in cold ionweak water.
  • Reference system with open aperture minimizes the risk of clogging.
  • Supports the requirements of quality management with tamper-proof stored information such as serial number or calibration history

Integrated technologies

Memosens technology
Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

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Warranty terms apply

The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

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Technology
Memosens technology

Memosens 2.0: Cutting-edge sensor technology reloaded

Make life easier, increase process safety and stay connected with Memosens 2.0 digital technology.

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Product information

Digital pH sensor Memosens CPL51E
Digital pH sensor
Specifications
Measuring / Application task pH
No results found Try adjusting your search terms to see more results.
Description

With its robust plastic shaft and contactless inductive Memosens cable connection, Memosens CPL51E is made for random sampling directly in the field or in the laboratory. The sensor comes pre-calibrated and is directly ready for use. Ideally to be used in combination with the mobile handheld Liquiline Mobile CML18 without any additional settings.

Field of application

Memosens CPL51E is suited for the following applications in drinking water, wastewater and process water:

  • Check of on-line measuring loops
  • Analysis of grab samples (on-site as well as in the laboratory)
  • pH measurement at process points where no online measurement is installed
Benefits
  • The inductive Memosens sensor connection is insensitive to moisture and corrosion.
  • Suitable for use in the laboratory or in the field to check your running process. A physical protection keeps the glass membrane safe in both environments.
  • Automatic temperature compensation thanks to integrated temperature sensor.
  • Fast response time even in cold ionweak water.
  • Reference system with open aperture minimizes the risk of clogging.
  • Supports the requirements of quality management with tamper-proof stored information such as serial number or calibration history
Downloads
Most downloaded
Technical Information (TI)
Memosens CPL51E pH sensor for laboratory measurements and random sampling in the field
English version - 01/2022
Download
Operating Instruction (BA)
Memosens CPLxxE pH laboratory sensors with Memosens 2.0 technology
English version - 01/2022
Download
PU (Publication)
Un suivi fiable des valeurs mesurées — à tout moment et en tout lieu Le package Liquiline Mobile CML18
French version - 08/2020
Download
The CAD Drawings will be available after the configuration.
All downloads
17 Downloads
Technical Information (TI)
Most downloaded
Memosens CPL51E pH sensor for laboratory measurements and random sampling in the field
English version - 01/2022
Download
Operating Instruction (BA)
Most downloaded
Memosens CPLxxE pH laboratory sensors with Memosens 2.0 technology
English version - 01/2022
Download
PU (Publication)
Un suivi fiable des valeurs mesurées — à tout moment et en tout lieu Le package Liquiline Mobile CML18
French version - 08/2020
Download
PU (Publication)
Reliable monitoring of measured values - anytime and anywhere The Liquiline Mobile CML18 value package
English version - 06/2023
Download
PU (Publication)
Zuverlässige Messwertkontrolle - Wo und wann Sie wollen Das Liquiline Mobile CML18 Vorteilspaket
German version - 06/2023
Download
Competence Brochure (CP)
Memosens Laboratory Portfolio Make it easy and give me values I can trust
English version - 01/2026
Download
Competence Brochure (CP)
Gamme Memosens pour laboratoire Donnez-moi des valeurs fiables en toute simplicité
French version - 10/2023
Download
Competence Brochure (CP)
Memosens Laborportfolio Einfache Messung und verlässliche Werte
German version - 02/2023
Download
Innovation (IN)
Liquiline Mobile CML18および高性能ラボ用センサ 取扱いが容易で信頼性の高い値を提供
Japanese version - 03/2023
Download
AI (Application note)
Two is better than one Random sample measurements
leave nothing to chance
English version - 04/2025
Download
AI (Application note)
Doppelt hält besser Durch Stichprobenmessungen
nichts mehr dem Zufall überlassen
German version - 04/2025
Download
Manufacturer Declaration
Product family: Memosens Product root: CPL51E-, CPL53E-, CPL57E-, CPL59E-
Declaration number: HE_01610_02.25
Manufacturer specification: RoHS
Additional information: China-RoHS
English version - 09/2025
Download
EU Declaration
Product family: CeraGel, CeraLiquid, Ceramax, ConduMax H, ConduMax W, InduMax H, InduMax P, Liquiline, Memosens, Messkabel, Orbi Pac, OrbiPore, OrbiSint, OxyMax H, OxyMax W, TopHit Product root: CLS15D-, CLS16D-, CLS21D-, CLS50D-, CLS54D-, CLS82D-,
CML18-, COS21D-, COS22D-, COS51D-, COS81D-, CPF82D-, CPL51E-
,
CPS11D-, CPS12D-, CPS16D-, CPS171D-, CPS31D-, CPS341D-, CPS41D-,
CPS42D-, CPS441D-, CPS471D-, CPS47D-, CPS491D-, CPS71D-,
CPS72D-,
CPS77D-, CPS91D-, CPS92D-, CPS96D-, CPS97D-, CYK10-, CYK20-
Declaration number: EC_00828_02.20
English version - 02/2022
Download
EU Declaration
Product family: Memosens Product root: CPL51E-, CPL53E-, CPL57E-, CPL59E-
Declaration number: EU_01000_01.22
English version - 02/2022
Download
UK Conformity Assessed
Product family: Memosens Product root: CPL51E-, CPL53E-, CPL57E-, CPL59E-
Declaration number: UK_00482_01.22
English version - 02/2022
Download
UK Conformity Assessed
Product family: Memosens Product root: CPL51E-
Declaration number: UK_00395_01.21
English version - 08/2021
Download
Components sheet
SF Kit CPSxx protective caps SF Kit CPSxx protective caps
English version - 08/2026
Download

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Spare parts and accessories

further parts
further parts

Kit CPSxx protective caps

further parts
further parts
Order code 71538217

KCL-Electrolyte solution CPY4

Order code CPY4-

Technical buffer solution CPY20

Order code CPY20-
Spare parts & accessories

Selection of compatible products

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