Technical Data
ComparepH
| Measuring Principle | |
| Application | Drinking water and swimming pool water, pH compensation for measuring free chlorine |
| Characteristic | Standard applications in water, long lifetime |
| Measuring range | pH 1 to 12 |
| Measuring principle | Gel filled reference with one or three diaphragms, optional saltring |
| Design | Shaft with temperature sensor |
| Material | Glass and Ceramic |
| Dimension | Diameter: 12 mm (0.47 inch) Shaft length: 120 mm (4.70 inch) |
| Process temperature | 0 to 80 °C (32 to 176 °F) |
| Process pressure | 1 to 4 bar (15 to 60 psi) |
| Temperature sensor | NTC 30k |
| Ex certification | None |
| Connection | Memosens plug-in head for digital, non-contact data transmission |
| Ingress protection | IP68 |
Memosens CPS31D is a digital electrode designed specifically for pH compensation in disinfection processes. With three ceramic diaphragms, it is suitable for measuring media with the lowest conductivity, features low drift and ensures stable measurement, thereby guaranteeing compliant swimming pool water and drinking water that meets potable-water standards. Thanks to Memosens digital technology, CPS31D offers maximum process and data integrity combined with simple operation. The electrode is corrosion-resistant and moisture-proof and can be calibrated in the laboratory and pre-maintained.
Benefits
Three-diaphragm design ensures reliable measurement in media with the lowest conductivity
Low drift and very low electrolyte ion consumption
Optional salt ring for a longer service life
Non-contact inductive signal transmission ensures maximum process safety
Sensor characteristic data are stored, enabling predictive maintenance
Reduced process downtime, longer sensor service life and lower operating costs
Common models: CPS31D-7AC21
Spare Parts & Accessories 4
4 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71038228 | *** sensorfor assignment of sensors to measuring loop. 100 sensor clips with printable labels | Details |
| 71538217 | CPSxx electrode protection cap20 pc protective caps for pH sensors CPSxx | Details |
| CPY4- | KCl electrolyte CPY4For liquid filled electrodes | Enquire |
| CPY20- | pH buffer solution CPY20pH quality buffer solution, referenced to primary reference material of PTB and standard reference material of NIST. With calibration certificate buffer solution | Enquire |
Configurator / Comparison
Measuring Principle Video
Click to playSource:Endress+Hauserwebsite public information
Manuals & Documents 7
All documents for this model7 documents · click to expand
BA CPSx1, CPFx1 pH电极 CPSx2, CPFx2 ORP电极 Chinese
BA CPSx1, CPFx1 pH sensors CPSx2, CPFx2 ORP sensors English
pH-/Redoxsensoren und Referenzhalbzellen pH/ORP sensors and reference half cells Operating Instructions English
Memosens CPS31D和Ceratex CPS31 Chinese
技术资料 Memosens CPS31D和Ceratex CPS31 Chinese
Memosens CPS31D and Ceratex CPS31 English
Technical Information CPS 31 English
Case Studies
Municipal Wastewater Treatment · PH — Application Case
Application Context
the inlet, biological and outlet stages of a municipal plant is a typical Municipal Wastewater Treatment duty. The project started from PH, focusing on continuous pH monitoring for neutralisation and compliance control.
Process Constraints
effluent parameters drift and probes foul with sludge and biofilm, and high solids and corrosive fractions, with large diurnal flow swings only amplify it. The PH specification must therefore cover choosing glass or ISFET sensors by temperature, fluoride content and pressure.
Delivery Approach
Delivery was handled as the analyser range — selecting as part of a complete water-analysis system. Execution centred on choosing glass or ISFET sensors by temperature, fluoride content and pressure, together with stable compliance with Grade 1A discharge limits and online data reporting.
Field Results
Operation shows the benefit clearly — tighter dosing control and lower reagent consumption, with confidence in this measuring point improving markedly.
Food & Beverage · PH — Application Case
Customer Profile
The typical setting in Food & Beverage is dosing, pasteurising, filling and CIP stages. The measuring point is PH; the focus is continuous pH monitoring for neutralisation and compliance control.
Key Difficulties
Conditions are syrups, dairy and beverages that scale easily, under strict hygienic requirements and, on top of that, frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, which a standard configuration cannot handle for long. The design therefore starts with choosing glass or ISFET sensors by temperature, fluoride content and pressure.
Implementation
The scope ran through the analyser range: selecting as part of a complete water-analysis system. Technically it hinges on choosing glass or ISFET sensors by temperature, fluoride content and pressure, and on these requirements: food-safety and hygienic design per 3-A / EHEDG.
Customer Benefit
In practice this means tighter dosing control and lower reagent consumption, which cut the workload on the site maintenance team.
Chemical & Pharmaceutical · PH — Application Case
Project Background
The project covers reactors, metering vessels and finished-product tanks. The work centres on PH and the core task is continuous pH monitoring for neutralisation and compliance control.
Operating Challenges
The medium and duty are characterised by highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. So PH cannot be specified generically — it calls for choosing glass or ISFET sensors by temperature, fluoride content and pressure.
Solution
The Ainstru engineering team worked through the analyser range: selecting as part of a complete water-analysis system. The configuration involves choosing glass or ISFET sensors by temperature, fluoride content and pressure, with these requirements in view: Ex certification and GMP traceability of records.
Results
Since start-up the system has run steadily; the practical result is tighter dosing control and lower reagent consumption.
Power & Energy · PH — Application Case
Project Overview
The site is boiler feedwater, turbine condensate and FGD/DeNOx systems. The customer wanted PH properly configured on the existing plant, with the aim of continuous pH monitoring for neutralisation and compliance control.
Technical Challenges
What actually causes trouble is high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. All of this means the PH configuration has to involve choosing glass or ISFET sensors by temperature, fluoride content and pressure.
Configuration
Supply and installation were organised through the analyser range: selecting as part of a complete water-analysis system. On site this meant choosing glass or ISFET sensors by temperature, fluoride content and pressure, checked line by line against: compliance with power-industry codes and unit availability targets.
Performance
After commissioning the outcome is tighter dosing control and lower reagent consumption, and the readings are now used for process tuning.
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