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Analog pH sensor Ceraliquid CPS41

Glass electrode for applications with fast-changing medium compositions or low conductivity

Ceraliquid CPS41 - Analog pH sensor with refillable liquid KCl electrolyte
Ceraliquid CPS41 - Analog pH sensor with refillable liquid KCl electrolyte
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Analog pH sensor Ceraliquid CPS41

Glass electrode for applications with fast-changing medium compositions or low conductivity

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Benefits

  • Resistant to poisoning due to constant refilling of KCl bridge electrolyte and separate reference lead
  • Applicable at very low conductivities (= 0.1 µS/cm) thanks to liquid KCl electrolyte
  • Suitable for cleaning in place (CIP) and sterilization in place (SIP)
  • Perfectly suited for quickly changing media: Combination of liquid KCl electrolyte and ceramic diaphragm enables fast response time
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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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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.

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Product information

Ceraliquid CPS41 - Analog pH sensor with refillable liquid KCl electrolyte
Analog pH glass sensor
Specifications
Measuring / Application task pH

Measuring range

pH 0-14

Process temperature

max. 135°C (274°F)

Process pressure

max. 10bar (145psi)

Measuring principle

Potentiometric

Application

- special applications with high requirements with regard to accuracy and speed - rapid changing composition of media, highly clogging media, low conductivities.

Characteristic

- for lowest conductivity - diaphragm with defined electrolyte flow - can be subject to pressure to prevent clogging - gel-free refillable electrolyte - fast response time

Measuring principle

liquid-KCl with ceramic diaphragm

Design

- all shaft lengths with temperature sensor.

Material

glass / ceramic

Dimension

Diameter: 12mm (0.46 inch) shaft length: 120, 225, 360 and 425 mm
(4.68, 8.77, 14.04 and 16,57 inch)

Temperature sensor

Optional with integrated Pt100

Ex certification

Simple operational equipment, no certification necessary.

Connection

TOP68 connection head

Ingress protection

IP 68

Certificates, declarations and approvals

3A
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Description

Ceraliquid CPS41 is the analog high performer for pH measurement in harsh chemical applications and media with low conductivity or a considerable content of organic solvents. The sensor is designed for fast response guaranteeing you high process safety even in applications with quickly changing medium compositions.

Field of application

Media with very low conductivities or a considerable amount of organic solvents or alcohols and fast changing media:

  • Chemical industry
  • Power plants, e.g. boiler feed water
  • Life sciences, e.g. water for injection

With ATEX, FM and CSA approval for use in hazardous areas.

Benefits
  • Resistant to poisoning due to constant refilling of KCl bridge electrolyte and separate reference lead
  • Applicable at very low conductivities (= 0.1 µS/cm) thanks to liquid KCl electrolyte
  • Suitable for cleaning in place (CIP) and sterilization in place (SIP)
  • Perfectly suited for quickly changing media: Combination of liquid KCl electrolyte and ceramic diaphragm enables fast response time
Downloads
Most downloaded
Technical Information (TI)
Technical Information CPS41, CPS41D pH electrodes, analogue and digital with Memosens technology, with
ceramic diaphragm
and liquid KCl electrolyte, also with integrated temperature sensor
English version - 01/2015
Download
Operating Instruction (BA)
BA CPSx1, CPFx1 pH sensors CPSx2, CPFx2 ORP sensors pH and ORP measurement
English version - 03/2026
Download
Ex Safety Instruction (XA)
Analog pH/ORP sensors pH/ORP measurement
Supplement to BA01572C, BA02056C
Safety instructions for electrical apparatus in explosion-hazardous
areas
ATEX II 1G Ex ia IIC T3/T4/T6 Ga
English version - 10/2021
Download
The CAD Drawings will be available after the configuration.
More options
Download page as PDF Search downloads by serial number
More options
Download page as PDF Search downloads by serial number
All downloads
24 Downloads
Technical Information (TI)
Most downloaded
Technical Information CPS41, CPS41D pH electrodes, analogue and digital with Memosens technology, with
ceramic diaphragm
and liquid KCl electrolyte, also with integrated temperature sensor
English version - 01/2015
Download
Operating Instruction (BA)
BA CPSx1, CPFx1 pH sensors CPSx2, CPFx2 ORP sensors pH and ORP measurement
English version - 03/2026
Download
Ex Safety Instruction (XA)
Analog pH/ORP sensors pH/ORP measurement
Supplement to BA01572C, BA02056C
Safety instructions for electrical apparatus in explosion-hazardous
areas
ATEX II 1G Ex ia IIC T3/T4/T6 Ga
English version - 10/2021
Download
Ex Safety Instruction (XA)
Analog ph/ORP sensors Temperature probe CTS1 pH/ORP measurement
Supplement to BA01572C, BA02056C
Safety instructions for electrical apparatus in explosion-hazardous
areas
UKEx II 1 G Ex ia IIC T3/T4/T6 Ga
English version - 12/2021
Download
Ex Safety Instruction (XA)
XA Analog pH/ORP sensors pH and ORP measurement
EAC Ex 0Ex ia IIC T3/T4/T6 Ga X
EAC Ex 0Ex ia IIC T4/T6 Ga X
English version - 06/2025
Download
Ex Safety Instruction (XA)
Analog pH/ORP sensors pH and ORP measurement
Supplement to BA01572C
Safety instructions for electrical equipment in explosion-hazardous
areas
EAC Ex 0Ex ia IIC T3/T4/T6 Ga X
EAC Ex 0Ex ia IIC T4/T6 Ga X
EAC Ex 1Ex ib IIC T3/T4/T6 Gb X
English version - 03/2022
Download
Ex Safety Instruction (XA)
XA Analog pH/ORP sensors Temperature probe CTS1 pH and ORP measurement
CSA C/US IS Cl. I Div. 1 GP A-D T3/T4/T6
CSA C/US IS Cl. I Zone 0 AEx ia IIC T3/T4/T6
English version - 01/2026
Download
Special Documentation (SD)
Kurzanleitung pH-/Redox-Sensoren - Short Instructions pH/ORP sensors pH-/Redox-Sensoren - pH/ORP sensors
English version - 04/2007
Download
Special Documentation (SD)
CPS41/41D/42/441 Adapting existing KCl supplies to new CPS4x/CPS441
Umstellen bestehender KCl-Zufuhr auf neue CPS4x/CPS441
English version - 05/2015
Download
Competence Brochure (CP)
pH-Messung in Industrieprozessen Auswahl- und Engineering-Hilfe für verschiedene Industriebranchen und
Applikationen
German version - 12/2021
Download
Competence Brochure (CP)
pH 測定セレクションガイド 産業プロセスにおけるpH測定
Japanese version - 06/2026
Download
Competence Brochure (CP)
pH measurement in industrial processes Selection and engineering guide for different industries and
applications
English version - 12/2021
Download
Manufacturer Declaration
Product family: CeraLiquid Product root: CPS41-
Declaration number: HE_02222_01.25
Manufacturer specification: RoHS
Additional information: China-RoHS
English version - 09/2025
Download
EU Declaration
Product family: CeraGel, CeraLiquid, CeraTex, OrbiPore, OrbiSint, OrbiTex, Sensor Product root: CPS11-, CPS12-, CPS13-, CPS21-, CPS31-, CPS41-, CPS42-, CPS43-, CPS64-, CPS71-, CPS72-, CPS91-, CPS92-, CTS1-
Declaration number: EC_00624_05.26
English version - 06/2026
Download
EU Declaration
Product family: CeraGel, CeraLiquid, CeraTex, NoryLab, OrbiPore, OrbiSint, OrbiTex, Sensor, TopHit Product root: CPS11-, CPS12-, CPS13-, CPS21-, CPS31-, CPS41-, CPS42-, CPS43-, CPS441-, CPS471-, CPS491-, CPS51-, CPS52-, CPS64-, CPS
65-, CPS71-, CPS72-, CPS91-, CPS92-
Declaration number: EU_00921_02.23
English version - 01/2023
Download
UK Conformity Assessed
Product family: CeraGel, CeraLiquid, CeraTex, OrbiPore, OrbiSint, OrbiTex, Sensor Product root: CPS11-, CPS12-, CPS31-, CPS41-, CPS71-, CPS72-, CPS91-, CTS1-
Declaration number: UK_00442_01.21
English version - 10/2021
Download
Miscellaneous
Product family: Absorbance, CeraGel, CeraLiquid, Ceramax, CeraTex, Memosens, OrbiPore, OrbiSint, PuriSys, Turbidity and total suspen ded solids Product root: CPF81E-, CPS11-, CPS11E-, CPS13-, CPS31E-, CPS341D-, CPS41-, CPS41E-, CPS47E-, CPS61E-, CPS71-, CPS71E-, CPS77E-, CPS9
1-, CPS91E-, CPS97E-, OUSAF11-, OUSTF10-
Region: Eurasian Economic Union
Approval agency: T-Standard
Approval number: ЕАЭС KZ 7500525.13.12.00643
Russian version - 02/2025
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, ConduMax H, ConduMax W, InduMax H, InduMax P, Liquiline M, Memocheck, OrbiPac, OrbiPore, OrbiSi nt, Sensor, TopHit Product root: CLS12-, CLS13-, CLS15-, CLS16-, CLS21-, CLS50-, CLS54-, CM42-, CPF81-, CPF82-, CPS11-, CPS12-, CPS13-, CPS41-, CPS42-,
CPS441-, CPS471-, CPS491-, CPS71-, CPS72-, CPS91-, CPS92-, CTS1-, CYP03D-
Region: Canada
Approval agency: CSA
Protection: Ex i Cl. I Div. 1
English version - 06/2023
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, OrbiPore, OrbiSint, Sensor Product root: CPS11-, CPS12-, CPS13-, CPS41-, CPS42-, CPS64-,
CPS71-, CPS72-, CPS91-, CTS1-
Region: Brazil
Portuguese version - 06/2019
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, ConduMax H, ConduMax W, InduMax P, Liquiline M, Memocheck, Memosens, Messkabel, OrbiPac, OrbiPo re, OrbiSint, OxyMax H, OxyMax W, Sensor, TopHit Product root: CLS12-, CLS13-, CLS15-, CLS15D-, CLS16-, CLS16D-, CLS21-, CLS21D-, CLS50-, CLS50D-, CLS82D-, CM42-, COS21D-, COS22D-,
COS51D-, CPF81-, CPF81D-, CPF82-, CPF82D-, CPS11-, CPS11D-, CPS12-, CPS12D-, CPS13-, CPS16D-, CPS171D-, CPS41-, CPS41D-, CPS42-, CPS
42D-, CPS441-, CPS441D-, CPS471-, CPS471D-, CPS491-, CPS491D-, CPS64-, CPS71-, CPS71D-, CPS72-, CPS72D-, CPS76D-, CPS91-, CPS91D-, C
PS92-, CPS92D-, CPS96D-, CTS1-, CYK10-, CYP01D-, CYP02D-, OPS171D-
Region: USA
Approval agency: FM
Protection: Ex i Cl. I Div. 1
English version - 10/2021
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, ConduMax H, ConduMax W, InduMax H, InduMax P, OrbiPac, OrbiPore, OrbiSint, Sensor Product root: CLS12-, CLS13-, CLS15-, CLS16B-, CLS21-, CLS50-, CLS54-, CPF81-, CPF82-, CPS11-, CPS12-, CPS13-, CPS41-, CPS42-, CPS71
-, CPS72-, CPS91-, CPS92-, CTS1-
Region: USA
Approval agency: CSA
Protection: IS Cl. I Div. 1
English version - 03/2026
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, CeraTex, OrbiPore, OrbiSint, OrbiTex, Sensor Product root: CPS11-, CPS12-, CPS13-, CPS21-, CPS31-, CPS41-, CPS42-, CPS43-, CPS71-, CPS72-, CPS91-, CPS92-, CTS1-
Region: Europe
Approval agency: TÜV
Protection: Ex i Zone 0
English version - 08/2021
Download
Explosion Protection
Product family: CeraGel, CeraLiquid, ConduMax H, ConduMax W, InduMax H, InduMax P, Memosens, OrbiPore, OrbiSint Product root: CLS12-, CLS13-, CLS15-, CLS15E-, CLS16B-, CLS16E-, CLS21-, CLS21E-, CLS50-, CLS50D-, CLS54-, CLS82E-, COS22E-, COS51E-
, COS81E-, CPS11-, CPS11E-, CPS12-, CPS12E-, CPS16E-, CPS31E-, CPS41-, CPS41E-, CPS42E-, CPS47E-, CPS61E-, CPS62E-, CPS71-, CPS71E-,
CPS72-, CPS72E-, CPS76E-, CPS77E-, CPS91-, CPS91E-, CPS92E-, CPS96E-, CPS97E-
Region: Kazakhstan
Approval agency: T-Standard
Protection: Ex i Zone 0
Russian version - 04/2025
Download
Components sheet
SF Kit CPSxx protective caps SF Kit CPSxx protective caps
English version - 08/2026
Download

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Ceraliquid CPS41 - Analog pH sensor with refillable liquid KCl electrolyte
Analog pH glass sensor

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Analog pH glass sensor
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Spare parts and accessories

further parts
further parts

Kit CPSxx protective caps

further parts
further parts
Order code 71538217

Memoclip label memosens cable

Order code 71038229

KCL-Electrolyte solution CPY4

Order code CPY4-

Technical buffer solution CPY20

Order code CPY20-
Spare parts & accessories
20 results
further parts
further parts

Kit CPSxx protective caps

Kit CPSxx protective caps

further parts
further parts
Order code 71538217

Memoclip label memosens cable

Memoclip label memosens cable

Order code 71038229

KCL-Electrolyte solution CPY4

KCL-Electrolyte solution CPY4

Order code CPY4-

Technical buffer solution CPY20

Technical buffer solution CPY20

Order code CPY20-

Elektrolyte reservoir CPY7B

Elektrolyte reservoir CPY7B

Order code CPY7B-
No results found Try adjusting your search terms to see more results.

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activating price
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Liquiline M CM42 offers safe measurement in all process applications – even in hazardous areas.
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The certified reference pH buffer solutions are available for pH 4, pH 7 and pH 10.
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Highly precise pH buffer solutions in 2 quality levels for all industries

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