Simple Conductivity Measurement for Pure Water
The Condumax CLS19 is designed for straightforward conductivity measurement in pure and ultrapure water applications. It focuses on reliable measurement in low conductivity ranges while keeping the sensor construction simple and practical for standard industrial installations.
Unlike more specialized Endress+Hauser conductivity sensors designed for hygienic production, high-temperature power plant applications or demanding process conditions, the CLS19 is positioned as a simple standard sensor for applications where advanced construction features are not required.
Two-Electrode Conductive Measuring Principle
The CLS19 uses a conductive two-electrode measuring cell with coaxially arranged electrodes. This configuration is designed for low-conductivity water measurement and provides the basic measuring arrangement required for pure-water applications.
Two cell constants are available:
k=0.01: 0–20 μS/cm
k=0.1: 0–200 μS/cm
The selected cell constant should correspond to the expected conductivity range of the application.
Designed for Pure and Ultrapure Water
The CLS19 is intended for applications involving pure and ultrapure water, where conductivity is commonly used as an indicator of water quality.
Endress+Hauser specifically lists ion exchangers, reverse osmosis, cooling water, distillation and chip cleaning as application areas.
Reliable Measurement at Low Conductivity
The sensor is designed to provide reliable and accurate conductivity measurement in low measuring ranges. This makes it suitable for water-treatment applications where conductivity values are significantly lower than those found in ordinary process liquids.
The available cell constants allow the same sensor family to cover two different low-conductivity ranges.
Robust and Low-Maintenance Construction
The CLS19 uses a PES sensor shaft with stainless steel 1.4571 electrodes. The construction is intended for durability and low maintenance in standard water-quality applications.
This relatively simple construction also contributes to the sensor's practical installation and maintenance characteristics.
Easy Installation with Threaded Connection
The CLS19 is designed for straightforward installation using an NPT 1/2" process connection. The electrical connection uses a 4-pole DIN connector with Pg9.
This makes the sensor suitable for conventional installation arrangements without requiring a specialized hygienic process connection.
Optional Integrated Temperature Measurement
Depending on the configuration, the CLS19 can be supplied with an integrated Pt100 temperature sensor.
This allows conductivity measurement to be combined with temperature measurement at the same measuring point, which can be useful because conductivity changes with temperature.
Suitable for Standard Water Treatment Applications
The CLS19 can be applied to several common water-treatment and water-quality monitoring tasks.
Typical applications include monitoring the output of ion exchange systems and reverse osmosis systems, checking conductivity after distillation, monitoring cooling water and measuring water used in semiconductor or chip-cleaning processes.
Compact Sensor Design
With an electrode diameter of 16 mm, the CLS19 provides a relatively compact sensing arrangement for standard conductivity measurement. The sensor has IP65 ingress protection according to the current Endress+Hauser specifications.
A Practical Choice for Standard Applications
Endress+Hauser describes the CLS19 as offering a good price-performance ratio, while emphasizing reliable low-conductivity measurement, easy installation, robust construction and low maintenance.
This makes the CLS19 particularly suitable when the application requires a dependable conductivity sensor without the additional hygienic or high-temperature features found on more specialized models.
Key Features
Product type: Analog conductivity sensor
Measuring principle: Conductive
Sensor design: 2-electrode conductivity cell
Coaxially arranged electrodes
Designed for pure and ultrapure water
k=0.01: 0–20 μS/cm
k=0.1: 0–200 μS/cm
Process temperature: Maximum 60°C
Process pressure: Maximum 6 bar at 20°C
PES sensor shaft
Stainless steel 1.4571 electrodes
Optional integrated Pt100
NPT 1/2" process connection
4-pole DIN connector with Pg9
IP65 protection
Electrode diameter 16 mm
Designed for low maintenance
Robust construction for standard applications
Suitable for ion exchangers, reverse osmosis, cooling water, distillation and chip cleaning
Typical Applications
Ion Exchange Systems
The CLS19 can monitor conductivity downstream of ion exchange systems, providing an indication of changes in treated-water quality.
Reverse Osmosis Systems
Conductivity is commonly monitored in reverse osmosis systems to assess the quality of the treated water. The CLS19 is designed for this type of low-conductivity measurement.
Distillation
The sensor can be used for conductivity monitoring in distilled-water systems where low conductivity is expected.
Cooling Water
The CLS19 is also listed for cooling-water applications, providing conductivity measurement for water-quality monitoring.
Chip Cleaning
The sensor can be used in chip-cleaning applications, where monitoring the conductivity of process or cleaning water can help maintain water-quality requirements.
Pure and Ultrapure Water Monitoring
For general pure and ultrapure water systems that do not require specialized hygienic or high-temperature sensor construction, the CLS19 provides a straightforward conductivity measurement solution.
FAQ
What is the Endress+Hauser CLS19?
The Condumax CLS19 is an analog two-electrode conductivity sensor designed for low-conductivity measurement in pure and ultrapure water applications.
What does the CLS19 measure?
The CLS19 measures the electrical conductivity of water and other suitable liquids in low conductivity ranges. The available ranges are 0–20 μS/cm and 0–200 μS/cm, depending on the selected cell constant.
What is the difference between k=0.01 and k=0.1?
The two versions cover different conductivity ranges. k=0.01 is designed for 0–20 μS/cm, while k=0.1 covers 0–200 μS/cm.
Is the CLS19 suitable for ultrapure water?
Yes. The CLS19 is specifically designed for pure and ultrapure water applications and is suitable for applications such as reverse osmosis, ion exchange and distillation.
What is the maximum process temperature?
The maximum specified process temperature is 60°C.
What is the maximum process pressure?
The maximum specified process pressure is 6 bar at 20°C.
Does the CLS19 have a temperature sensor?
An integrated Pt100 temperature sensor is available as an option, depending on the selected configuration.
What is the process connection?
The CLS19 uses an NPT 1/2" process connection.
Is the CLS19 a Memosens sensor?
No. The CLS19 is an analog conductivity sensor with a two-electrode conductive measuring cell. It is not a digital Memosens sensor.
What materials are used in the CLS19?
The sensor shaft is made from PES, while the electrodes are stainless steel 1.4571.
What applications is the CLS19 designed for?
Endress+Hauser lists ion exchangers, reverse osmosis, cooling water, distillation and chip cleaning among the intended applications.
What is the difference between CLS19 and CLS16B?
Both are analog conductivity sensors for pure and ultrapure water, but their application positioning is different. The CLS19 is designed for simple standard applications, with a maximum process temperature of 60°C and NPT 1/2" connection. The CLS16B is designed for more demanding hygienic applications, including CIP/SIP and life sciences applications.
