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TI00085C/07/EN/15.18
71392467
Products
Solutions Services
Technical Information
Condumax CLS21D/CLS21
Conductivity sensors, analog or digital with
Memosens technology
Cell constant k = 1.0 cm
Application
Measurement in media with average or high conductivity:
• Separation of media with average conductivity (milk/water)
• Separation of media with high conductivity (alkali/water)
• Drinking water treatment
• Wastewater treatment
Sensors with temperature probes are used in conjunction with conductivity
measuring devices that support automatic temperature compensation:
• Liquiline CM442/CM444/CM448 (only CLS21D)
• Liquiline CM42
• Liquiline CM14 (only CLS21D)
• Liquisys CLM223/253 (only CLS21)
The resistivity in MΩ · cm can also be measured using these transmitters.
Your benefits
• Different designs for optimum adaptation to the process or mounting location
• Installation in pipe or flow assembly
• Compact design
• With plug-in head (IP68 (CLS21D), IP65 (CLS21)) or fixed cable (IP67)
• High chemical, thermal and mechanical resistance
• Manufacturer inspection certificate stating the individual cell constant
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
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Function and system design
AC
I
U
1
2
3
Condumax CLS21D/CLS21
Measuring principle
Measuring system
Conductivity of liquids is determined with a measuring
arrangement where two electrodes are located in the
medium. An alternating voltage that causes a current
to flow through the medium is applied at these
electrodes. The electrical resistance, or its reciprocal
value - conductance G - is calculated based on Ohm's
law. The specific conductance κ is determined from the
conductance value using the cell constant k, which
depends on the sensor geometry.
A0024260
1 Conductive measurement of conductivity
AC Alternating voltage source
I Current intensity measurement
U Voltage measurement
A complete measuring system comprises the following components at least:
• The conductively measuring conductivity sensor CLS21D or CLS21
• A transmitter, e.g. Liquiline M CM42
• A measuring cable, e.g. Memosens data cable CYK10 or CYK71 for analog sensors
2 Example of a measuring system (with Memosens sensor)
1 Liquiline M CM42 transmitter
2 Memosens data cable
3 Condumax CLS21D
2 Endress+Hauser
A0024376
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Condumax CLS21D/CLS21
Communication and data processing (only CLS21D)
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
Reliability
Maintainability
Integrity
Dependability (only CLS21D)
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.
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Input
GN/YE
YE
GN
BN
WH
GND
+
–
Com A
Com B
GY
GN/YE
Outer shield
(see wiring diagram
of transmitter)
YE
GN
WH
Pt 100
Coax BK
Coax inner
shield (outer electrode)
BN n.c.
conductivity (inner electrode)
}
Cable
GY
Sensor
Plug
2
3
1
)
}
Condumax CLS21D/CLS21
Measured values
• Conductivity
• Temperature
Measuring ranges
Conductivity (in relation to water at 25 °C (77 °F))
CLS21D / CLS21 10 μS/cm to 20 mS/cm
Temperature
CLS21D
CLS21
Cell constant
Temperature compensation
CLS21D / CLS21
NTC 30K (CLS21D)
Pt100 (Class B as per IEC 60751) (CLS21)
Power supply
Electrical connection CLS21D
The electrical connection simulator to the transmitter is established using measuring cable CYK10.
-20 to 100 °C (-4 to 212 °F)
-20 to 135 °C (-4 to 275 °F)
k = 1.0 cm–1, nominal
A0024019
3 Measuring cable CYK10
CLS21
The sensor is connected via the fixed cable or the CYK71 measuring cable with shield. The wiring
diagram is provided in the Operating Instructions of the transmitter used.
A0024205-EN
4 Measuring cable CYK71
A compatible cable connector is included in the delivery for the plug-in head versions. You must
terminate the CYK71 cable (not included in the delivery) with the cable connector at the sensor end
according to the connection diagram above.
A VMB junction box and another CYK71 cable are required for the cable extension.
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Condumax CLS21D/CLS21
Performance characteristics, general
Uncertainty of measurement
Response time
Maximum measured error
Repeatability
Installation instructions
Each individual sensor is factory-measured in a solution of approx. 5 mS/cm (CLS21D) or approx.
500 µS/cm (CLS21) using a reference measuring system traceable to NIST or PTB. The exact cell
constant is entered into the manufacturer inspection certificate supplied. The uncertainty of
measurement in determining the cell constant is 1.0 %.
Performance characteristics (only CLS21D)
Conductivity
Temperature t90 ≤ 296 s
5% of reading
0.2% of reading
t95 ≤ 3 s
Installation
The sensors are installed directly via the process connection. As an option, the sensor can also be
installed via a flow assembly (see "Accessories").
5 Installation in flow assembly CLA751
A0019019
6 Installation in flow assembly CLA752
A0035650
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Condumax CLS21D/CLS21
A B
D
A0024201
7 Installation in flow assembly CLA751
8 Installation in flow assembly CLA752
The Dipfit CLA111 immersion assembly is available to install sensors with a G1 thread in vessels
(see Accessories).
A0024202
A0024145
9 Installation in Dipfit CLA111 immersion assembly, fastening versions A, B and D
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Condumax CLS21D/CLS21
5
9
13
17
300 60 90 120
[°C]
-4
1
10060 140 180 220
72
130
188
-20
14
[°F]
20
68 275
246
[psi]
[bar]
3.5
51
135
p (abs.)
T
20
Environment
Ambient temperature
Storage temperature
Humidity
Degree of protection
Process temperature
Process pressure (absolute)
-20 to +60 °C (-4 to 140 °F)
-25 to +80 °C (-10 to +180 °F)
5 to 95 %
CLS21D IP 68 / NEMA type 6P (1 m water column, 25 °C, 24 h)
CLS21
Fixed cable version IP 67 / NEMA 6
Plug-in head version IP 65 / NEMA 4X
Process
CLS21D
CLS21
Threaded version with fixed cable
Version with plug-in head, Clamp version-20 to 135 °C (-4 to 275 °F) at 3.5 bar (50 psi) absolute
The maximum temperature for communication with the transmitter is 130 °C (266°F) for the
Memosens versions.
CLS21D / CLS21
-20 to 135 °C (-4 to 275 °F) at 3.5 bar (50 psi) absolute
-20 to 100 °C (-4 to 212 °F)
17 bar (246 psi) absolute, at 20 °C (68 °F)
Temperature-pressure ratings
A0031435-EN
10 Mechanical pressure-temperature resistance
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Design CLS21D
1
2
4
1
4
2
3
1
2
3
Condumax CLS21D/CLS21
Mechanical construction
Design CLS21
11 CLS21D
1 Memosens plug-in head
2 Process connection (here G1)
3 Coaxial measuring electrodes made of graphite
4 Wrench flats for mounting
12 Design with plug-in head
1 Four-pin connector
2 Cable gland Pg9
3 Process connection (DN 40 dairy pipe)
4 Sensor shaft with measuring electrodes
A0024380
A0024381
A0024379
13 Design with fixed cable
1 fixed cable
2 Process connection (here NPT 1" thread)
3 Sensor shaft with measuring electrodes
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Condumax CLS21D/CLS21
186 (7.32)
79 (3.11)
18 (0.71)
G1
Ø 24 (0.94)
16 (0.63)
Ø 44 (1.73)
Ø 34 (1.34)
AF 36
Ø 24 (0.94)
16 (0.63)
186 (7.32)
58 28(2. )
21 83(0. )
Ø 64
(2.52)
Ø 44 (1.73)
Ø 34 (1.34)
49 1 93( . )
Ø 2 ( )9 1.14
Ø 24 (0.94)
16 (0.63)
186 (7.32)
61 (2.40)
10 (0.39)
DN 25
Ø 34 (1.34)
AF 35
16 (0.63)
61 (2.40)
186 (7.32)
14 (0.55)
NPT 1"
87 (3.43)
Ø 24 (0.94)
Ø 34 (1.34)
Dimensions CLS21D in mm (in)
14 Version with thread G1
16 Version with sanitary connection
A0024382
15 Version with Clamp 2"
A0024393
17 Version with thread NPT 1"
A0024390
A0024394
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Dimensions CLS21 in mm
AF 35
1 ( )40 5.51
1 7 (6. )6 57
NPT 1"
NPT 1"
16 (0.63)
61 (2.40)
Ø 24 (0.94)
14 (0.55)
127 5.00( )
Ø 64
(2.52)
Ø 34 (1.34)
21 83(0. )
11 (4. )1 37
1 (5. )51 94
16 (0.63)
58 28(2. )
Ø 24 (0.94)
Ø 4 (1. )4 73
Ø 2 ( )9 1.14
(in)
Condumax CLS21D/CLS21
18 Fixed cable version with NPT 1" thread
A0024397
19 Fixed cable version with Clamp 2"
A0024398
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Condumax CLS21D/CLS21
151 (5.94)
79 (3.11)
36 (1.42)
18 (0.71)
21 (0.83)
36 (1.42)
Ø 44 (1.73)
G 1
16 (0.63)
61 (2.40)
Ø 24 (0.94)
151 (5.94)
57 24(2. )
36 (1.42)
21 83(0. )
Ø 64
(2.52)
16 (0.63)
58 28(2. )
Ø 24 (0.94)
Ø 34 (1.34)
Ø 2 ( )9 1.14
49 1.93( )
151 (5.94)
54 (2.13)
36 (1.42)
10 (0.39)
DN 25/DN 40
16 (0.63)
61 (2.40)
Ø 24 (0.94)
Ø 34 (1.34)
Weight
A0024401
20 Plug-in head version with G1 thread
A0024403
22 Plug-in head version with sanitary connection
Approx. 0.3 kg (0.66 lbs) depending on version
A0024402
21 Plug-in head version with Clamp 2"
Materials (in contact with medium)
Electrodes
Sensor shaft Polyethersulfone (PES-GF20)
Thermal conductivity socket for
Graphite
Titanium 3.7035
temperature probe
Process connections
Clamp process connection
• Process connection
• Seal
Thread G1
NPT 1" thread
• Stainless steel 1.4435
• EPDM
Clamp 2" as per ISO 2852
Sanitary connection DN 25 and DN 40 as per DIN 11851
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Certificates and approvals
Condumax CLS21D/CLS21
mark
Ex approvals
Manufacturer inspection certificate
Declaration of Conformity
The product meets the requirements of the harmonized European standards. As such, it complies
with the legal specifications of the EU directives. The manufacturer confirms successful testing of the
product by affixing to it the mark.
CLS21D-**G
ATEX / NEPSI II 1G Ex ia IIC T3/T4/T6 Ga, IECEx Ex ia IIC T3/T4/T6 Ga
CLS21D-**O
CLS21D-**V
ATEX/NEPSI II 3G Ex ic IIC T3/T4/T6 Gc for use in Zone 2 with Liquiline M CM42-KV*** transmitter
CLS21
ATEX II 1G Ex ia IIC T3/T4/T6 Ga
• EAC Ex, 0Ex ia IIC T6/T4/T3 Ga X
• Zone 0
• Certificate number: TC RU C-DE.AA87.B.00088
• The product has been certified in accordance with Directive TR CU 012/2011 which applies in the
European Economic Area (EEA). The EAC conformity mark has been affixed to the product.
ATEX and FM/CSA versions of digital sensors with Memosens technology are indicated by an
orange-red ring in the plug-in head (sensors for zone 0) or a white-gray axial ring (sensors for
zone 2).
Stating the individual cell constant
Product page
Product Configurator
Scope of delivery
Ordering information
www.endress.com/cls21d
www.endress.com/cls21
On the product page there is a "Configure" button to the right of the product image Configure.
1. Click this button.
The Configurator opens in a separate window.
2. Select all the options to configure the device in line with your requirements.
In this way, you receive a valid and complete order code for the device.
3. Export the order code as a PDF or Excel file. To do so, click the appropriate button on the right
above the selection window.
For many products you also have the option of downloading CAD or 2D drawings of the
selected product version. Click the tab for this CAD and select the desired file type using
picklists.
The scope of delivery includes:
• Sensor in the version ordered
• Cable connector, for connecting to CYK71 measuring cable (only for plug-in head versions CLS21)
• Operating Instructions
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Condumax CLS21D/CLS21
160 (6.30)
G 1
120 (4.72)
Ø 20 (0.79)
G 1
G 1
Ø 50
(1.97)
Ø 80 (3.15)
G ½
G ½
G 1
160 (6.30)
Accessories
The following are the most important accessories available at the time this documentation was
issued.
For accessories not listed here, please contact your Service or Sales Center.
‣
Assemblies
Dipfit CLA111
• Immersion assembly for open and closed vessels with flange DN 100
• Product Configurator on the product page: www.products.endress.com/cla111
Technical Information TI00135C
Flow assembly CLA751
• For installing conductivity sensors with G1 thread (CLS12, CLS13, CLS21, CLS30)
• Inlet (below) and outlet (lateral) DN 20 with G1 thread adapter nut
• Stainless steel 1.4571 (AISI 316Ti)
• Max. temperature 160 °C (320 °F), max. pressure 12 bar (174 psi)
• Order No. 50004201
A0024377
23 Dimensions in mm (inch)
Flow assembly CLA752
• For installing conductivity sensors with G1 thread (CLS12, CLS13, CLS21, CLS30)
• Inlet (lateral) and outlet (lateral) DN 20 with G½ internal thread
• Polypropylene (PP)
• Max. temperature 90 °C (194 °F), max. pressure 6 bar (87 psi)
• Order No. 50033772
A0024378
24 Dimensions in mm (inch)
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Condumax CLS21D/CLS21
Measuring cable
Junction boxes (only CLS21)
CYK10 Memosens data cable
• For digital sensors with Memosens technology
• Product Configurator on the product page: www.endress.com/cyk10
Technical Information TI00118C
Memosens data cable CYK11
• Extension cable for digital sensors with Memosens protocol
• Product Configurator on the product page: www.endress.com/cyk11
Technical Information TI00118C
Measuring cable CYK71
• Unterminated cable for connecting analog sensors and for extending sensor cables
• Sold by the meter, order numbers:
– Non-Ex version, black: 50085333
– Ex-version, blue: 50085673
VBM
• Junction box for cable extension
• 10 terminal strips
• Cable entries: 2 x Pg 13.5 or 2 x NPT ½"
• Material: aluminum
• Degree of protection: IP 65
• Order numbers
– Cable entries Pg 13.5 : 50003987
– Cable entries NPT ½": 51500177
VBM-Ex
• Junction box for cable extension in hazardous area
• 10 terminal strips (blue)
• Cable entries: 2 x Pg 13.5
• Material: aluminum
•
Degree of protection: IP 65 ( NEMA 4X)
• Order number: 50003991
Calibration solutions
Conductivity calibration solutions CLY11
Precision solutions referenced to SRM (Standard Reference Material) by NIST for qualified
calibration of conductivity measuring systems in accordance with ISO 9000
• CLY11-A, 74 μS/cm (reference temperature 25 °C (77 °F)), 500 ml (16.9 fl.oz)
Order No. 50081902
• CLY11-B, 149.6 μS/cm (reference temperature 25 °C (77 °F)), 500 ml (16.9 fl.oz)
Order No. 50081903
• CLY11-C, 1.406 mS/cm (reference temperature 25 °C (77 °F)), 500 ml (16.9 fl.oz)
Order No. 50081904
• CLY11-D, 12.64 mS/cm (reference temperature 25 °C (77 °F)), 500 ml (16.9 fl.oz)
Order No. 50081905
Technical Information TI00162C
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