Technical Data
ComparepH
| Measuring Principle | Potentiometric |
| Application | • Drinking water • Swimming pool water • pH compensation during the measurement of free chlorine |
| Characteristic | Digital pH electrode for standard applications in drinking water and swimming pool water |
| Measuring range | pH 1 to 12 |
| Measuring principle | Gel filled reference with one or three ceramic junctions with optional salt storage |
| Design | All shaft lengths with temperature sensor |
| Material | Sensor shaft: Glass to suit process pH membrane: glass Type A Metal lead Ag/AgCl Open aperture: Ceramic junction O-ring: FKM Process coupling: PPS fiber-glass reinforced Nameplate: Ceramic metal oxide |
| Dimension | Diameter: 12 mm (0.47 inch) Shaft length: 120 mm (4.70 inch) |
| Process temperature | –15 to 80 °C (5 to 176 °F) |
| Process pressure | 0.8 to 4 bar (11.6 to 58 psi) (absolute) |
| Temperature sensor | NTC 30k |
| Ex certification | With ATEX, IECEx, CSA C/US, NEPSI, Japan Ex and INMETRO approvals for use in hazardous areas Zone 0, Zone 1 and Zone 2. |
| Connection | Inductive, contactless connection head with Memosens 2.0 technology |
| Ingress protection | IP68 |
Field of application
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Memosens CPS31E is the expert for pH compensation in disinfection processes. It delivers stable measurement results, ensuring safe swimming pool and drinking water. Thanks to Memosens 2.0 digital technology, CPS31E provides the perfect data basis for predictive maintenance, offers easy operation and more process uptime since it can be calibrated in the laboratory and quickly exchanged on site. The sensor resists moisture and its 3 optional junctions make it suitable for minimum conductivity.
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Drinking water
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Swimming pool water
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pH compensation for free chlorine and free bromine measurement
Benefits
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Reliable: Ceramic junction ensures reliable measurement at low conductivities. For minimum conductivities, 3 junctions are the best choice.
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Robust: The optional salt storage provides for extended operating time.
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Precise: The sensor shows minimum drift thanks to a very low level of ion depletion in electrolyte.
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Memosens 2.0 offers extended storage of calibration and process data. These data are the ideal basis for predictive maintenance and can also be used to develop and provide enhanced IIoT services.
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Safe: Non-contact, inductive, digital signal transmission eliminates errors due to moisture.
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Cost-efficient: Fast sensor exchange in the field increases process uptime and regeneration extends the sensor lifetime.
pH:
| Measuring Principle | Potentiometric | |
| Application | • Drinking water • Swimming pool water • pH compensation during the measurement of free chlorine |
|
| Characteristic | Digital pH electrode for standard applications in drinking water and swimming pool water | |
| Measuring range | pH 1 to 12 | |
| Measuring principle | Gel filled reference with one or three ceramic junctions with optional salt storage | |
| Design | All shaft lengths with temperature sensor | |
| Material | Sensor shaft: Glass to suit process pH membrane: glass Type A Metal lead Ag/AgCl Open aperture: Ceramic junction O-ring: FKM Process coupling: PPS fiber-glass reinforced Nameplate: Ceramic metal oxide |
|
| Dimension | Diameter: 12 mm (0.47 inch) Shaft length: 120 mm (4.70 inch) |
|
| Process temperature | –15 to 80 °C (5 to 176 °F) | |
| Process pressure | 0.8 to 4 bar (11.6 to 58 psi) (absolute) | |
| Temperature sensor | NTC 30k | |
| Ex certification | With ATEX, IECEx, CSA C/US, NEPSI, Japan Ex and INMETRO approvals for use in hazardous areas Zone 0, Zone 1 and Zone 2. | |
| Connection | Inductive, contactless connection head with Memosens 2.0 technology | |
| Ingress protection | IP68 | |
Spare Parts & Accessories 5
5 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71038228 | *** sensorfor assignment of sensors to measuring loop. 100 sensor clips with printable labels | Details |
| 71038229 | *** cablefor assignment of Sensors to measuring loop. 50 cable labels 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
Manuals & Documents 4
All documents for this modelCase 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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