Technical Data
CompareConductivity
| Measuring Principle | |
| Application | Water, waste water, process, media separation, industrial water |
| Characteristic | 2-electrode system for application in the middle application range |
| Measuring range | k=1: 10 µS/cm to 20 mS/cm |
| Measuring principle | Conductive conductivity cell with graphite electrodes for applications in the middle range |
| Design | 2-electrode system with parallel arranged electrodes |
| Material | Sensor shaft: PES Electrodes: graphite |
| Dimension | Diameter: 24 mm (0.94 inch) Length: 61 mm (2.40 inch) |
| Process temperature | -20 to 135 °C at 3.5 bar abs (-4 to 275 °F at 50 psi) |
| Process pressure | 17 bar abs at 20 °C (246 psi at 68 °F) |
| Temperature sensor | NTC 30K |
| Ex certification | ATEX, NEPSI, EAC |
| Connection | Process connection: DN25, DN40, G1, NPT 1" Cable: Memosens connector CYK10 |
| Ingress protection | IP68 (connector) |
For the same analog range, use CLS21; for low-range analog measurement of pure water, use CLS19; for digital, use CLS15D.
Condumax CLS21D is a robust conductivity sensor suitable for all process and environmental industries. It provides accurate and reliable measured values to optimize process and product quality monitoring. Even better, the sensor has extremely high chemical, thermal and mechanical stability and is robust. Based on Memosens digital technology, CLS21D achieves maximum process and data integrity through simple operation, is corrosion-resistant, moisture-proof and enables predictive maintenance.
Benefits
Reliable and accurate measurement in medium/high conductivity applications
Robust with low maintenance requirements
High chemical, thermal and mechanical stability
Quality certificate with independent cell constant specification
Sensor-specific parameters are recorded for traceability and predictive maintenance
Maximum process safety through non-contact inductive signal transmission
Application
Condumax CLS21D is used for conductivity measurement in the process and environmental industries, such as:
Drinking water treatment
Desalination plants
Industrial water treatment
River/lake water monitoring
Phase separation in medium conductivity applications (e.g. milk/water)
With various international explosion protection approvals, such as ATEX, FM, CSA and NEPSI, this digital sensor is suitable for hazardous areas
Spare Parts & Accessories 5
5 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 50081902 | Calibration solution 74.0 µS/cm500 ml, reference temperature 25oC. Precision solution referred to SRM of NIST. With temp. table for qualified calibration of conductivity measuring systems acc. to ISO | Details |
| 50081903 | calibration solution500 ml, reference temperature 25oC. Precision solution referred to SRM of NIST. With temp. table for qualified calibration of conductivity measuring systems acc. to ISO. | Details |
| 50081904 | Calibration solution 1.406 mS/cm500 ml, reference temperature 25oC. Precision solution referred to SRM of NIST. With temp. table for qualified calibration of conductivity measuring systems acc. to ISO | Details |
| 50081905 | calibration solution500 ml, reference temperature 25oC. Precision solution referred to SRM to NIST. With temp. table for qualified calibration of conductivity measuring systems acc. to ISO | Details |
| 50081906 | calibration solution500 ml, reference temperature 25oC. Precision solution referred to SRM of NIST. With temp. table for qualified calibration of conductivity measuring systems acc. to ISO | Details |
Configurator / Comparison
A
Measuring Principle Video
Click to playSource:Endress+Hauserwebsite public information
Manuals & Documents 7
All documents for this model7 documents · click to expand
Condumax CLS15D, CLS16D, CLS21D Chinese
Condumax CLS15D/16D/21D English
技术资料 Condumax CLS21, CLS21D Chinese
技术资料 Condumax CLS21, CLS21D Chinese
技术资料 Condumax CLS21/CLS21D Chinese
Condumax CLS21D/CLS21 Technical Information English
Technical Information CLS21 and CLS21D English
Case Studies
Municipal Wastewater Treatment · conductivity — Application Case
Customer Profile
The typical setting in Municipal Wastewater Treatment is the inlet, biological and outlet stages of a municipal plant. The measuring point is conductivity; the focus is measuring conductivity to judge water purity or chemical concentration.
Key Difficulties
Conditions are high solids and corrosive fractions, with large diurnal flow swings and, on top of that, effluent parameters drift and probes foul with sludge and biofilm, which a standard configuration cannot handle for long. The design therefore starts with choosing two- or four-electrode cells by range and corrosivity.
Implementation
The scope ran through the analyser range: selecting as part of a complete water-analysis system. Technically it hinges on choosing two- or four-electrode cells by range and corrosivity, and on these requirements: stable compliance with Grade 1A discharge limits and online data reporting.
Customer Benefit
In practice this means stable concentration control and less reagent and discharge waste, which cut the workload on the site maintenance team.
Food & Beverage · conductivity — Application Case
Project Background
The project covers dosing, pasteurising, filling and CIP stages. The work centres on conductivity and the core task is measuring conductivity to judge water purity or chemical concentration.
Operating Challenges
The medium and duty are characterised by syrups, dairy and beverages that scale easily, under strict hygienic requirements, and frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. So conductivity cannot be specified generically — it calls for choosing two- or four-electrode cells by range and corrosivity.
Solution
The Ainstru engineering team worked through the analyser range: selecting as part of a complete water-analysis system. The configuration involves choosing two- or four-electrode cells by range and corrosivity, with these requirements in view: food-safety and hygienic design per 3-A / EHEDG.
Results
Since start-up the system has run steadily; the practical result is stable concentration control and less reagent and discharge waste.
Chemical & Pharmaceutical · conductivity — Application Case
Project Overview
The site is reactors, metering vessels and finished-product tanks. The customer wanted conductivity properly configured on the existing plant, with the aim of measuring conductivity to judge water purity or chemical concentration.
Technical Challenges
What actually causes trouble is highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. All of this means the conductivity configuration has to involve choosing two- or four-electrode cells by range and corrosivity.
Configuration
Supply and installation were organised through the analyser range: selecting as part of a complete water-analysis system. On site this meant choosing two- or four-electrode cells by range and corrosivity, checked line by line against: Ex certification and GMP traceability of records.
Performance
After commissioning the outcome is stable concentration control and less reagent and discharge waste, and the readings are now used for process tuning.
Power & Energy · conductivity — Application Case
Site Conditions
This is a Power & Energy customer whose plant is at boiler feedwater, turbine condensate and FGD/DeNOx systems. The main task was measuring conductivity to judge water purity or chemical concentration.
The Problem
The difficulty lies in high temperature and pressure with both steam and saline water; at the same time drift under high temperature and pressure, with very costly unplanned outages. Specification therefore means choosing two- or four-electrode cells by range and corrosivity.
What We Did
We took a analyser range approach — selecting as part of a complete water-analysis system. Delivery was built around choosing two- or four-electrode cells by range and corrosivity, with point-by-point checks on: compliance with power-industry codes and unit availability targets.
Operating Outcome
In service the system performs as intended — stable concentration control and less reagent and discharge waste, with routine maintenance falling noticeably.
