Endress+Hauser CLS82D Specifications

TI01188C/07/EN/04.17 71358714

Products

Solutions Services

Technical Information

Memosens CLS82D

Hygienic conductivity sensors, digital with Memosens technology, cell constant k = 0.57 cm

-1

Application

For measurements where very diverse conductivities must be measured by one measuring system.

Typical applications include:

• Phase separations

• Chromatography

• Fermentations

• CIP monitoring in small pipes

• Ultrafiltration

Your benefits

• High measuring accuracy as cell constant is individually measured

• Quality certificate stating the individual cell constant

• Hygienic process connections for installation in pipes or flow vessel

• IP68 protection

• Easy to clean thanks to electropolished surfaces

• Can be sterilized up to 140 °C (284 °F)

• Stainless steel 1.4435 (AISI 316L) meets the highest demands of the pharmaceutical industry

• The entire sensor is EHEDG- and 3A-certified

• FDA conformity

Other advantages of Memosens technology

• Maximum process safety thanks to non-contact, inductive signal transmission

• Data security thanks to digital data transmission

• Very easy to use as sensor data saved in the sensor

• Recording of sensor load data in the sensor enables predictive maintenance

Function and system design

Memosens CLS82D

Measuring principle

Measuring system

The measuring cell has four electrodes. An alternating current is applied via the outer electrode pair. At the same time, the voltage applied is measured at the two inner electrodes. The electrolytic conductivity between the electrodes can be reliably established based on the measured voltage and the current flow caused by the liquid's resistance. The advantage of this technology compared to traditional two-electrode sensors is that electrochemical effects at the live electrodes are suppressed by the two additional voltage measuring electrodes.

A0024312

 1 Conductivity measurement

I Current intensity measurement U Voltage measurement G Generator

A complete measuring system consists of the following components at least:

• Conductive conductivity sensor CLS82D

• A transmitter, e.g. Liquiline CM44x

• A Memosens data cable CYK10

A0024179

 2 Example of a measuring system

1 Memosens CLS82D

General properties

2 Liquiline CM44x transmitter 3 Measuring cable

Temperature measurement

In addition, a temperature probe is fitted in the sensor element to measure the temperature.

2 Endress+Hauser

Memosens CLS82D

Communication and data processing

Communication with the transmitter

Always connect digital sensors with Memosens technology to a transmitter with Memosens technology. Data transmission to a transmitter for analog sensors is not possible.

Digital sensors can store measuring system data in the sensor. These include the following:

• Manufacturer data – Serial number – Order code – Date of manufacture

• Calibration data – Calibration date – Cell constant – Delta cell constant – Number of calibrations – Serial number of the transmitter used to perform the last calibration

• Operating data – Temperature application range – Conductivity application range – Date of initial commissioning – Maximum temperature value – Hours of operation at high temperatures

Dependability

Serviceability

Interference immunity

Reliability

Memosens technology digitizes the measured values in the sensor and transmits the data to the transmitter using a non-contact connection that is free from potential interference. The result:

• Automatic error message if sensor fails or connection between sensor and transmitter is interrupted

• Immediate error detection increases measuring point availability

Easy handling

Sensors with Memosens technology have integrated electronics that store calibration data and other information (such as total hours of operation and operating hours under extreme measuring conditions). Once the sensor has been connected, the sensor data are transferred automatically to the transmitter and used to calculate the current measured value. As the calibration data are stored in the sensor, the sensor can be calibrated and adjusted independently of the measuring point. The result:

• Easy calibration in the measuring lab under optimum external conditions increases the quality of the calibration.

• Pre-calibrated sensors can be replaced quickly and easily, resulting in a dramatic increase in the availability of the measuring point .

• Maintenance intervals can be defined based on all stored sensor load and calibration data and predictive maintenance is possible.

• The sensor history can be documented on external data carriers and in evaluation programs. Thus, the current application of the sensors can be made to depend on their previous history.

With inductive transmission of the measured value using a non-contact connection, Memosens guarantees maximum process safety and offers the following benefits:

• All problems caused by moisture are eliminated. – Plug-in connection remains free from corrosion – Measured value distortion from moisture is not possible. – The plug-in system can even be connected under water.

• The transmitter is galvanically decoupled from the medium.

• EMC safety is guaranteed by screening measures for the digital transmission of measured values.

Endress+Hauser 3

Input

GN/YE

GND

–

Com A

Com B

Memosens CLS82D

Measured variable

Measuring range

Cell constant

Temperature compensation

Electrical connection

• Conductivity

• Temperature

Conductivity

1 µS/cm to 500 mS/cm

Temperature

-5 to 120 °C (23 to 248 °F)

CLS82D

k = 0.57 cm

-1

Pt1000 (Class A according to IEC 60751)

Power supply

The sensor is connected to the transmitter via measuring cable CYK10.

Uncertainty of measurement

Conductivity response time

Temperature response time

Maximum measured error

Repeatability

A0024019

 3 Measuring cable CYK10

Performance characteristics

Each individual sensor is factory-measured in a solution of approx. 50 μS/cm using a reference measuring system traceable to NIST or PTB. The exact cell constant is entered into the quality certificate supplied. The uncertainty of measurement in determining the cell constant is 1.0 %.

t90 ≤ 3 s

t90 ≤ 25 s

≤ 4 % of reading

0.2% of reading

4 Endress+Hauser

Memosens CLS82D

a 15≥

Installation

Symmetrical installation is recommended in order to guarantee linearity. The distance to the side walls and opposite walls must be at least 15 mm.

A0024621

 4 Minimum distance between pipe and end of the measuring cell

1 Sensor CLS82D 2 Pipe 3 Direction of flow

The ionic current in the liquid is affected by the walls in confined installation conditions. This effect is compensated by what is referred to as the installation factor. The installation factor can be entered in the transmitter for the measurement or the cell constant is corrected by multiplying by the installation factor.

The value of the installation factor depends on the diameter and the conductivity of the pipe nozzle as well as the sensor's distance to the wall. The installation factor can be disregarded (f = 1.00) if the distance to the wall is sufficient (a > 15 mm). If the distance to the wall is smaller, the installation factor increases for electrically insulating pipes (f > 1) and decreases for electrically conductive pipes (f < 1). The installation factor can be determined using calibration solutions.

A0024626

 5 Schematic drawing of the CLS82D in confined installation conditions

a Wall distance b Gap width

Endress+Hauser 5

+ 11 hidden pages