Endress+Hauser Condumax CLS15, Condumax CLS16, Condumax CLS21 Operating Instructions Manual

Products Solutions Services

Operating Instructions

Condumax CLS15/16/21

Analog sensors
For conductive measurement of conductivity in
liquids

0

BA01148C/07/EN/03.16
71337736

Table of contents

2 Endress+Hauser

Table of contents

1 Document information ......... 3

1.1 Warnings ........................... 3

1.2 Symbols ............................ 3

2 Basic safety instructions ....... 4

2.1 Requirements for personnel ........... 4

2.2 Designated use ...................... 4

2.3 Occupational safety .................. 4

2.4 Operational safety ................... 5

2.5 Product safety ....................... 5

3 Incoming acceptance and

product identification .......... 7

3.1 Incoming acceptance ................. 7

3.2 Product identification ................. 7

3.3 Scope of delivery ..................... 8

3.4 Certificates and approvals ............. 8

4 Installation .................... 10

4.1 Mounting the sensor ................ 10

4.2 Post-installation check ............... 14

5 Electrical connection .......... 14

5.1 Connection conditions ............... 15

5.2 Connecting the sensor ............... 16

5.3 Ensuring the degree of protection ..... 17

5.4 Post-connection check ............... 17

6 Commissioning ................ 17

7 Maintenance .................. 18

8 Repair .......................... 19

8.1 Sealing ring replacement and

recalibration (CLS16 only) ............ 19

8.2 Return ............................ 19

8.3 Disposal ........................... 20

9 Technical data ................. 21

10 EU Declaration of

conformity ..................... 27

Condumax CLS15/16/21 Document information

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1 Document information

1.1 Warnings

Structure of information Meaning

L

DANGER

Causes (/consequences)

Consequences of non-compliance (if
applicable)

‣

Corrective action

This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious injury.

L

WARNING

Causes (/consequences)

Consequences of non-compliance (if
applicable)

‣

Corrective action

This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious injury.

L

CAUTION

Causes (/consequences)

Consequences of non-compliance (if
applicable)

‣

Corrective action

This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.

NOTICE

Cause/situation

Consequences of non-compliance (if
applicable)

‣

Action/note

This symbol alerts you to situations which may result in damage to property.

1.2 Symbols

Symbol Meaning

Additional information, tips

Permitted or recommended

Not permitted or not recommended

Reference to device documentation

Reference to page

Reference to graphic

 Result of a step

Basic safety instructions Condumax CLS15/16/21

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2 Basic safety instructions

2.1 Requirements for personnel

• Installation, commissioning, operation and maintenance of the measuring system may be
carried out only by specially trained technical personnel.

• The technical personnel must be authorized by the plant operator to carry out the specified
activities.

• The electrical connection may be performed only by an electrical technician.

• The technical personnel must have read and understood these Operating Instructions and
must follow the instructions contained therein.

• Measuring point faults may be repaired only by authorized and specially trained personnel.

Repairs not described in the Operating Instructions provided may only be carried out
directly by the manufacturer or by the service organization.

2.2 Designated use

The conductivity sensors are designed for the conductive measurement of the conductivity of
liquids.

They are used in the following fields:

Sensor Applications Hazardous areas

Condumax CLS15 Measurements in pure and ultrapure water Approved for Ex zone 0

Condumax CLS16 Measurements in pure and ultrapure water with hygienic requirements Approved for Ex zone 0

Condumax CLS21 Measurements in media with medium or high conductivity Approved for Ex zone 0

Use of the device for any purpose other than that described, poses a threat to the safety of
people and of the entire measuring system and is therefore not permitted.

The manufacturer is not liable for damage caused by improper or non-designated use.

2.3 Occupational safety

As the user, you are responsible for complying with the following safety conditions:

• Installation guidelines

• Local standards and regulations

• Regulations for explosion protection

Electromagnetic compatibility

• The product has been tested for electromagnetic compatibility in accordance with the
applicable European standards for industrial applications.

• The electromagnetic compatibility indicated applies only to a product that has been
connected in accordance with these Operating Instructions.

Condumax CLS15/16/21 Basic safety instructions

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2.4 Operational safety

1. Before commissioning the entire measuring point, verify that all connections are
correct. Ensure that electrical cables and hose connections are undamaged.

2. Do not operate damaged products, and safeguard them to ensure that they are not
operated inadvertently. Label the damaged product as defective.

3. If faults cannot be rectified:
Take the products out of operation and safeguard them to ensure that they are not

operated inadvertently.

2.5 Product safety

2.5.1 State of the art

The product is designed to meet state-of-the-art safety requirements, has been tested, and
left the factory in a condition in which it is safe to operate. The relevant regulations and
European standards have been observed.

2.5.2 Electrical equipment in hazardous areas

ATEX/NEPSI II 1G Ex ia IIC T3/T4/T6 Ga

• The sensors CLS15 / CLS16 / CLS21 have been developed and manufactured in compliance
with applicable European standards and guidelines and are suitable for use in hazardous
areas. The EC type examination certificate confirms compliance with the harmonized
European standards for using the sensors in hazardous areas. The corresponding EU
declaration of conformity is part of this document.

• The sensors may only be operated on suitable intrinsically safe circuits. Make sure that the
maximal permissible sensor input characteristic values, the maximum permissible
inductance Li and capacitance values Ci in these circuits and the ambient temperature
ranges indicated are not exceeded.

• The electrical connection must be made according to the wiring diagram of the transmitter.

• Metallic process connection parts must be mounted at the mounting location
electrostatically conductive (< 1 MΩ).

• The CLS15-type sensors with non-metal process connections and the CLS21-type sensors
may only be employed for measurement in liquids with a minimum conductivity of
10 nS/cm.

• The CLS15-type sensors with non-metal process connections may not be operated under
process conditions in which electrostatic charging of the sensor, and particularly of the
electrically insulated outer electrode, is likely to occur.

• The maximum permissible cable length is limited by the maximum permissible
characteristic values of the transmitter: the total of the maximum permissible inductance L

i

and capacitance values Ci for the sensor and measuring cable may not exceed the maximum
permissible inductance Lo and capacitance values Co for the transmitter.

• When connected to the Mycom S CLM153 transmitter, the maximum permissible length of
measuring cables CYK71/CYK71-Ex or CPK9 is 16 m. When connected to the Liquiline M
CM42 transmitter, the maximum length is 50 m.

• Full compliance with regulations for electrical systems in hazardous areas (e.g. EN/IEC
60079-14) is mandatory when using the devices and sensors.

Basic safety instructions Condumax CLS15/16/21

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Temperature classes

Name Type Medium temp. Ta for temperature class (Tn) Cat.

x1 x2 x3 x4

Condumax CLS15 - * ** * A -20 °C ≤ Ta ≤ +140 °C (T3)

-20 °C ≤ Ta ≤ +115 °C (T4)

-20 °C ≤ Ta ≤ +65 °C (T6)

II 1G

Condumax CLS16 - X ** * A/B -5 °C ≤ Ta ≤ +150 °C (T3)

-5 °C ≤ Ta ≤ +115 °C (T4)

-5 °C ≤ Ta ≤ +65 °C (T6)

II 1G

Condumax CLS21 - * ** * D -20 °C ≤ Ta ≤ +135 °C (T3)

-20 °C ≤ Ta ≤ +130 °C (T4)

-20 °C ≤ Ta ≤ +80 °C (T6)

II 1G

CLS21 - * ** * A -20 °C ≤ Ta ≤ +135 °C (T3)

-20 °C ≤ Ta ≤ +115 °C (T4)

-20 °C ≤ Ta ≤ +65 °C (T6)

II 1G

X ... Variant not applicable
x1 ... Measuring range and cell constant (no Ex relevance)
x2 ... Process connection / material (no Ex relevance)
x3 ... Measuring cable connection
x4 ... Temperature sensor: A = Pt 100, B = Pt 1000, D = without temperature sensor

• If the specified medium temperatures are complied with, temperatures that are not
permitted for the respective temperature class will not occur on the equipment.

• With the exception of sensor version CLS15-*1M**, for functional reasons the CLS15
sensors may only be operated up to 120 °C (248 °F) during continuous operation / and up to
140 °C (284 °F) for short periods. The CLS15-*1M** version may only be operated up to
100 °C (212 °F) during continuous operation.

• For functional reasons, the CLS16 sensors may only be operated up to 120 °C (248 °F)
during continuous operation / and up to 150 °C (302 °F) for short periods.

The following connection values are safety limits which may not be exceeded when connecting
to the transmitter:

Parameters Connection data

Supply circuit Intrinsically safe

Maximum input voltage U

i

15 V

Maximum input current I

i

30 mA

Maximum input power P

i

130 mW

Maximum internal capacitance C

i

Negligible

Maximum internal inductance L

i

Negligible

Condumax CLS15/16/21 Incoming acceptance and product identification

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Parameters Connection data

Measuring cable CPK9 / CYK71

Maximum internal capacitance C

i

1 nF/m

Maximum internal inductance L

i

6 µH/m

FM/CSA IS/NI Cl.1 Div.1&2 Gr. A-D

Observe the documentation and the control drawings of the transmitter.

3 Incoming acceptance and product identification

3.1 Incoming acceptance

1. Verify that the packaging is undamaged.
 Notify your supplier of any damage to the packaging.

Keep the damaged packaging until the matter has been settled.

2. Verify that the contents are undamaged.
 Notify your supplier of any damage to the delivery contents.

Keep the damaged products until the matter has been settled.

3. Check the delivery for completeness.
 Check it against the delivery papers and your order.

4. Pack the product for storage and transportation in such a way that it is protected
against impact and moisture.

 The original packaging offers the best protection.

The permitted ambient conditions must be observed (see "Technical data").

If you have any questions, please contact your supplier or your local sales center.

3.2 Product identification

3.2.1 Nameplate

The nameplate provides you with the following information on your device:

• Manufacturer identification

• Extended order code

• Serial number

• Safety information and warnings

• Cell constant (nominal value)

• Protection class

• Ex labeling on hazardous area versions

‣

Compare the data on the nameplate with your order.

Incoming acceptance and product identification Condumax CLS15/16/21

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3.2.2 Product identification

Product page

www.endress.com/cls15
www.endress.com/cls16
www.endress.com/cls21

Interpreting the order code

The order code and serial number of your product can be found in the following locations:

• On the nameplate

• In the delivery papers

Obtaining information on the product

1. Go to the product page for your product on the Internet.

2. At the bottom of the page, select the "Online Tools" link followed by "Check your device
features".

 An additional window opens.

3. Enter the order code from the nameplate into the search field, and then select "Show
details".

 You will receive information on each feature (selected option) of the order code.

Manufacturer's address

Endress+Hauser Conducta GmbH+Co. KG
Dieselstraße 24
D-70839 Gerlingen

3.3 Scope of delivery

The scope of delivery includes:

• Sensor in the version ordered

• Cable connector, for connecting to CYK71 measuring cable (only for plug-in head versions
CLS15 CLS21)

• Operating Instructions

3.4 Certificates and approvals

3.4.1

 mark

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.

Condumax CLS15/16/21 Incoming acceptance and product identification

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3.4.2 Hazardous area approvals

ATEX II 1G Ex ia IIC T3/T4/T6 Ga
FM/CSA IS/NI Cl. I Div.1&2 Gr. A-D in conjunction with Liquiline M CM42 transmitter

3.4.3 EHEDG (CLS16 only)

Validated as follows:

• Cleanability in accordance with EHEDG, Document 2

• Sterilizability in accordance with EHEDG, Document 5

• Bacteria-tightness in accordance with EHEDG, Document 7

3.4.4 FDA (CLS16 only)

All materials in contact with the product are listed by the FDA.

3.4.5 Manufacturer inspection certificate

Stating the individual cell constant

3.4.6 Biological reactivity test (USP class VI, CLS16 only)

Biological reactivity test certificate according to USP (United States Pharmacopeia)part <87>
and part <88> class VI with batch traceability of materials in contact with the medium

3.4.7 Inspection certificate in accordance with EN 10204 3.1

A test certificate 3.1 in accordance with EN10204 is supplied depending on the version (→
Product Configurator on the product page).

3.4.8 ASME (CLS16 only)

Manufactured in accordance with ASME criteria (American Society of Mechanical Engineers)

3.4.9 Ex-certification body
TÜV Rheinland Industrie Service GmbH

Cologne

Installation Condumax CLS15/16/21

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4 Installation

4.1 Mounting the sensor

4.1.1 CLS15

The sensors are installed directly via the process connection thread NPT ½" or ¾" or
clamp 1 ½". As an option, the sensor can also be installed using a commercially available T­piece or cross fitting or using a flow assembly.

NOTICE

Incorrect mounting or disassembly

The sensor head could become loose and fall off, resulting in total sensor failure

‣

Only mount the sensor via the process connection.

‣

To do so, use a suitable tool, such as an open-ended wrench.

Condumax CLS15/16/21 Installation

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2

1

3

35 (1.38)

A0024199

 1 With NPT ½" thread in T-piece or cross

fitting

1 T-piece or cross fitting (DN 32, 40 or 50)
2 Glue-in VC threaded coupling (NPT ½" for

DN 20)

3 Glue-in adapter coupling (for DN 32, 40, 50)

½”NPT

160 (6.30)

Ø 29 (1.14)

Ø 6 (0.24)

30 (1.18)

25 (0.98)

Ø 6 (0.24)

38.5

(1.52)

1

2

3

A0024200

 2 With NPT ½" thread in flow assembly

71042405, dimensions in mm (inch)

1 Sensor holder NPT ½"
2 Inlet
3 Outlet

Ensure that the electrodes are fully immersed in the medium during measurement. The
immersion depth must be at least 35 mm (1.38"). If the sensor is being used in the
ultrapure water range, you must work under air-evacuated conditions. Otherwise the CO

2

in the air can dissolve in the water and its (weak) dissociation can increase the
conductivity by up to 3 µS/cm.

Installation Condumax CLS15/16/21

12 Endress+Hauser

4.1.2 CLS16

The sensors are installed directly via the process connection. Take the flow direction into
consideration when installing in pipes.

A0024198

 3 Permitted flow direction

A0024197

 4 Inadmissible flow direction

Ensure that the electrodes are fully immersed in the medium during measurement. If the
sensor is being used in the ultrapure water range, you must work under air-evacuated
conditions. Otherwise the CO2 in the air can dissolve in the water and its (weak)
dissociation can increase the conductivity by up to 3 µS/cm.

4.1.3 CLS21

Clamp connection

Both sheet-metal brackets and solid brackets can be used to secure the sensor. Sheet­metal brackets have a lower dimensional stability, uneven bearing surfaces causing point
loads, and sometimes sharp edges that can damage the clamp. We recommend you only
use solid brackets due to their higher dimensional stability. Solid brackets can be used
over the entire pressure/temperature range (see pressure-temperature ratings).

Condumax CLS15/16/21 Installation

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The sensors are installed directly via the process connection. As an option, the sensor can also
be installed via a flow assembly.

NOTICE

Incorrect mounting or disassembly

The sensor head could become loose and fall off, resulting in total sensor failure

‣

Only mount the sensor via the process connection.

‣

To do so, use a suitable tool, such as an open-ended wrench.

A0024201

 5 Installation in flow assembly CLA751

A0024202

 6 Installation in flow assembly CLA752

Electrical connection Condumax CLS15/16/21

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The Dipfit CLA111 immersion assembly is available to install sensors with a G1 thread in
vessels.

A B

D

A0024145

 7 Installation in Dipfit CLA111 immersion assembly, fastening versions A, B and D

Ensure that the electrodes are fully immersed in the medium during measurement.

4.2 Post-installation check

• Are the sensor and cable undamaged?

• Is the sensor installed in the process connection and is not suspended from the cable?

5 Electrical connection

L

WARNING

Device is live

Incorrect connection may result in injury or death

‣

The electrical connection may be performed only by an electrical technician.

‣

The electrical technician must have read and understood these Operating Instructions and
must follow the instructions contained therein.

‣

Prior to commencing connection work, ensure that no voltage is present on any cable.

Condumax CLS15/16/21 Electrical connection

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5.1 Connection conditions

5.1.1 Connection at a glance

CPS11
CPS12
CPS71
CPS72
CPS91
CPS13
CPS64

EX

Ex ia Ga

CPS41
CPS42

Ex ia Ga

EX

CLS50

CPS471
CPS491

CPS441

CLS54

CLS12

CLS13 CLS15 CLS16 CLS21

IIC 2G

IIC 1G

IIC 3G

Zone 1

Zone 0

Zone 2

A0031175

 8 Electrical connection in hazardous areas

Electrical connection Condumax CLS15/16/21

16 Endress+Hauser

5.2 Connecting the sensor

5.2.1 CLS15 and CLS21

The sensor is connected via the fixed cable or via the CYK71 measuring cable with a shield.
The wiring diagram is provided in the Operating Instructions of the transmitter used.

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

)

A0024205-EN

 9 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.

5.2.2 CLS16

The sensor is electrically connected via the CPK9 measuring cable (plug-in head versions) or
the sensor's fixed cable. The wiring diagram is provided in the Operating Instructions of the
transmitter used.

Outer electrode
Inner electrode

BN

n.c.

BK
WH

GN

WH
YE

Temp.
Temp.
Temp.

GY

Outer shield
(see wiring diagram
of transmitter)

A0024206-EN

 10 Measuring cable CPK9

A VMB junction box and a CYK71 cable are required for the cable extension.

Condumax CLS15/16/21 Commissioning

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5.3 Ensuring the degree of protection

Only the mechanical and electrical connections which are described in these instructions and
which are necessary for the required, designated use, may be carried out on the device
delivered.

‣

Exercise care when carrying out the work.

Otherwise, the individual types of protection (Ingress Protection (IP), electrical safety, EMC
interference immunity) agreed for this product can no longer be guaranteed due, for example,
to covers being left off or cable (ends) which are loose or insufficiently secured.

5.4 Post-connection check

Device condition and specifications Notes

Are the outside of the sensor, assembly, cable undamaged? Visual inspection

Electrical connection Notes

Are the installed cables strain-relieved and not twisted?

Is a sufficient length of the cable cores stripped, and is it positioned
in the terminal correctly?

Check the fit (by pulling gently)

Are all the screws terminals properly tightened? Tighten

Are all cable entries mounted, tightened and leak-tight? For lateral cable entries, make sure the cables

loop downwards to allow water to drip off

Are all cable entries installed downwards or mounted laterally?

6 Commissioning

Before first commissioning, check if:

• the sensor is correctly installed

• the electrical connection is correct.
If using an assembly with automatic cleaning, check that the cleaning medium (e.g. water or

air) is connected correctly.

L

WARNING

Escaping process medium

Risk of injury from high pressure, high temperatures or chemical hazards

‣

Before applying compressed air to an assembly with cleaning facility, make sure the
connections are correctly fitted.

‣

Do not install the assembly in the process if you cannot make the correct connection
reliably.

Maintenance Condumax CLS15/16/21

18 Endress+Hauser

7 Maintenance

L

CAUTION

Corrosive chemicals

Danger of chemical burns to the eyes and skin. Danger of damage to clothing and equipment

‣

It is absolutely essential to protect the eyes and hands properly when working with acids,
bases and organic solvents!

‣

Wear protective goggles and safety gloves.

‣

Clean away splashes on clothes and other objects to prevent any damage.

‣

Pay particular attention to the information provided in the safety data sheets for the
chemicals used.

L

WARNING

Hydrofluoric acid and mineral acids

Risk of serious or fatal injury from caustic burns

‣

Wear protective goggles to protect your eyes.

‣

Wear protective gloves and appropriate protective clothing.

‣

Avoid all contact with the eyes, mouth and skin.

‣

If using hydrofluoric acid, only use plastic vessels.

L

WARNING

Thiocarbamide

Harmful if swallowed. Limited evidence of carcinogenicity. Possible risk of harm to the unborn
child. Dangerous for the environment with long-term effects.

‣

Wear protective goggles, protective gloves and appropriate protective clothing.

‣

Avoid all contact with the eyes, mouth and skin.

‣

Avoid releases into the environment.

Clean away fouling on the sensor as follows depending on the type of fouling:

1. Oily and greasy films:
Clean with grease remover, e.g. alcohol, as well as hot water and (alkaline) agents

containing surfactants (e.g. dishwashing detergent).

2. Lime, cyanide and metal hydroxide buildup and low solubility organic buildup:
Dissolve buildup with diluted hydrochloric acid (3 %) and then rinse thoroughly with

plenty of clear water.

3. Sulfidic buildup (from flue gas desulfurization or sewage treatment plants):
Use a mixture of hydrochloric acid (3 %) and thiocarbamide (commercially available)

and then rinse thoroughly with plenty of clear water.

4. Buildup containing proteins (e.g. food industry):
Use a mixture of hydrochloric acid (0.5 %) and pepsin (commercially available) and then

rinse thoroughly with plenty of clear water.

Condumax CLS15/16/21 Repair

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5. Readily soluble biological buildup:
Rinse with pressurized water.

After cleaning or regeneration, you must rinse the sensor thoroughly with water and
then recalibrate it.

8 Repair

8.1 Sealing ring replacement and recalibration (CLS16 only)

Intact seals are a prerequisite for safe and reliable measurements. The seal should be replaced
at regular intervals to guarantee maximum sensor operational safety and hygiene.

Practical repair intervals can only be determined by the user as they depend greatly on the
operating conditions, such as:

• Type and temperature of the product

• Type and temperature of the cleaning agent

• Number of cleanings

• Number of sterilizations

• Operating environment

Recommended intervals for seal replacement (reference values)

Application Window

Media with temperatures from 50 to 100 °C (122 to 212 °F) Approx. 18 months

Media with temperatures < 50 °C (122 °F) Approx. 36 months

Sterilization cycles, max. 150 °C (302 °F), 45 min. Approx. 400 cycles

To ensure your sensor is operational again after being exposed to very high loads, you can
have it regenerated in the factory. In the factory, the sensor is fitted with new seals and
recalibrated.

Please contact your sales office for information on replacing the seal and recalibration in the
factory.

8.2 Return

The product must be returned if repairs or a factory calibration are required, or if the wrong
product was ordered or delivered. As an ISO-certified company and also due to legal
regulations, Endress+Hauser is obliged to follow certain procedures when handling any
returned products that have been in contact with medium.

To ensure swift, safe and professional device returns, please read the return procedures and
conditions at www.endress.com/support/return-material.

Repair Condumax CLS15/16/21

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8.3 Disposal

The device contains electronic components and must therefore be disposed of in accordance
with regulations on the disposal of electronic waste.

Observe the local regulations.

Condumax CLS15/16/21 Technical data

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9 Technical data

9.1 Input

9.1.1 Measured values

• Conductivity

• Temperature

9.1.2 Measuring ranges

Conductivity (in relation to water at 25 °C (77 °F))

CLS15-A 0.04 to 20 μS/cm
CLS15-B/L 0.10 to 200 μS/cm
CLS16 0.04 to 500 μS/cm
CLS21 10 μS/cm to 20 mS/cm

Temperature

CLS15 -20 to 140 °C (-4 to 280 °F)
CLS16 -5 to 150 °C (23 to 300 °F)
CLS21 -20 to 135 °C (-4 to 275 °F)

9.1.3 Cell constant

CLS15-A

k = 0.01 cm

–1

CLS15-B/L k = 0.1 cm

–1

CLS16 k = 0.1 cm

–1

CLS21 k = 1.0 cm–1, nominal

9.1.4 Temperature compensation

Pt 100 (class A as per IEC 60751) (CLS15) (CLS16) (CLS21)
Pt 1000 (class A as per IEC 60751)(CLS16, optional)

Technical data Condumax CLS15/16/21

22 Endress+Hauser

9.2 Performance characteristics

9.2.1 Uncertainty of measurement
CLS15

Each individual sensor is factory-measured in a solution of approx. 5 μS/cm for cell constant

0.01 cm-1 or approx. 50 μS/cm for cell constant 0.1 cm-1 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 %.

CLS16

Each individual sensor is factory-measured in a solution of approx. 5 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 %.

CLS21

Each individual sensor is factory-measured in a solution of approx. 500 µS/cmusing 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 %.

Condumax CLS15/16/21 Technical data

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9.3 Environment

9.3.1 Ambient temperature range

-20 to +60 °C (-4 to 140 °F)

9.3.2 Storage temperature

-25 to +80 °C (-10 to +180 °F)

9.3.3 Degree of protection

CLS15 IP 67 / NEMA 6
CLS16

Fixed cable version IP 67 / NEMA 6
TOP68 plug-in system IP 68 / NEMA 6

CLS21

Fixed cable version IP 67 / NEMA 6
Plug-in head version IP 65 / NEMA 4X

9.4 Process

9.4.1 Process temperature

CLS15
Threaded version with fixed cable -20 to 100 °C (-4 to 212 °F)
Threaded version with plug-in head, Clamp version

Normal operation -20 to 120 °C (-4 to 248 °F)
Sterilization (max. 1 h)

1)

Max. 140 °C (284 °F)

CLS16

Normal operation -5 to 120 °C (23 to 248 °F)

Sterilization (max. 45 min) Max. 150 °C (302 °F) at 6 bar (87 psi) absolute
CLS21
Threaded version with fixed cable -20 to 100 °C (-4 to 212 °F)
Version with plug-in head, Clamp version-20 to +135 °C (-4 to 275 °F) at 3.5 bar (50 psi)

absolute

1) Threaded versions: max. 30 minutes

Technical data Condumax CLS15/16/21

24 Endress+Hauser

9.4.2 Process pressure

CLS15 13 bar (188 psi) absolute, at 20 °C (68 °F)

2 bar (29 psi) absolute, at 120 °C (248 °F)

CLS16 13 bar (188 psi) absolute, at 20 °C (68 °F)

9 bar (130 psi) absolute, at 120 °C (248 °F)

0.1 bar (1.5 psi) absolute (negative pressure), at
20 °C (68 °F)

CLS21 17 bar (246 psi) absolute, at 20 °C (68 °F)

9.4.3 Temperature/pressure ratings

CLS15

A

14010060

68

20

-4

180 220 260

248

284

–20

0 20 40 60 80 100 120 140

B

212

[psi]

[° ]F

[bar]

[°C]

p (abs.)

T

14

43

72

188

1

3

5

7

9

11

13

A0031429-EN

 11 Mechanical pressure-temperature resistance

A Can be sterilized for a short time (1 hour)
B Threaded version with fixed cable

Condumax CLS15/16/21 Technical data

Endress+Hauser 25

CLS16

6

–5

20 60 100 120 150

23

60

68

120

180

240

248

300

20 60 100 120 150

302

A

[° ]F

[bar]

[°C]

p (abs.)

T

14

43

72

101

130

159

188

1

3

5

7

9

11

13

87

1.5 0.1

A0031431-EN

 12 Mechanical pressure-temperature resistance

A Can be sterilized for a short time (45 min.)

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

A0031435-EN

 13 Mechanical pressure-temperature resistance

9.5 Mechanical construction

9.5.1 Weight

CLS15 and CLS21

Approx. 0.3 kg (0.66 lbs) depending on version

Technical data Condumax CLS15/16/21

26 Endress+Hauser

CLS16

Approx. 0.13 to 0.75 kg (0.29 to 1.65 lbs) depending on version

9.5.2 Materials

CLS15

Electrodes Polished, stainless steel 1.4435 (AISI 316L)
Sensor shaft Polyethersulfone (PES-GF20)
O-ring, in contact with medium

(only Clamp version)

EPDM

CLS16

Electrodes Electropolished, stainless steel 1.4435 (AISI 316L)
Seal Gasket seal ISOLAST (FFKM), FDA-compliant

CLS21

Electrodes Graphite
Sensor shaft Polyethersulfone (PES-GF20)
Thermal conductivity socket for

temperature probe

Titanium 3.7035

9.5.3 Process connection

CLS15

Thread NPT ½" and ¾"
Clamp 1½" as per ISO 2852

CLS16

Clamp 1", 1½", 2" as per ISO 2852 (also suitable for TRI-CLAMP, DIN 32676)
Tuchenhagen VARIVENT N DN 50 to 125
NEUMO BioControl D50

CLS21

Thread G1
NPT 1" thread
Clamp 2" as per ISO 2852
Sanitary connection DN 25 as per DIN 11851

9.5.4 Surface roughness (CLS15, CLS16 only)

CLS15

Ra ≤ 0.8 μm

CLS16

Ra ≤ 0.8 μm, electropolished
Ra ≤ 0.38 μm, electropolished, optional

Condumax CLS15/16/21 EU Declaration of conformity

Endress+Hauser 27

10 EU Declaration of conformity

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