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Conductivity measurement in industrial processes

Conductivity measurement inindustrial processes
Selection and engineering guide fordifferent industries and applications

Step by step
It was over 50 years ago that we developed anddeployed the first conductivity sensors. Thesesensors are used primarily to monitor water
treatment and purification plants in the foodindustry, a sector in which we are leading the field.
Since then, we have been able to expand the range
of application with the development of new sensors,
including sensors for the life sciences and chemicalindustries. Today, Endress+Hauser is regarded
as a professional and reliable supplier across allindustries.
Our portfolio includes sensors and transmitters for
all conductivity measuring ranges. The choice ofsensor is determined by your application conditions.
For example, conductive sensors are often used
to measure low conductivity values in pure andultrapure water, while inductive sensors are suited
to media with high conductivity (e.g. milk, acids andbases).
A complete measuring point always comprises
a sensor, cable and transmitter, and in some
applications an assembly may be required for
installation. This guide is designed to help you
select and assemble the right products for yourapplications.

Overview of conductivity
measuring equipment

Selecting the right conductivity
sensors

In this section you will find a brief descriptionof the different components required:This section starts with a flow chart [3.1]and supports you in selecting the rightsensor based on the conductivity of themedium and the regulatory requirementsof the process.

• Conductivity sensors• Transmitters• Assemblies
Each section of this guide contains technicaldescriptions followed by tables listing
technical data, benefits and applications.

Checklist/Data sheet

This flow chart directs you to the individual
sections [3.2 – 3.7], where information isprovided on the recommended conductivity
sensors, key benefits, applications andpossible alternatives.

For a comprehensive specification, achecklist is available. Here, you also havethe option to make a drawing showing the
installation conditions.

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2

B

Contents
1. Conductivity sensors and types of installation . . . . . . . . . . . . . . . . . 4
1.1 Sensor types (inductive, conductive, two and four electrodes). . . . . . . . . . . . 4
1.2 Sensors in ultrapure, pure and process water applications. . . . . . . . . . . . . . . 6
1.3 Sensors in process water and drinking water applications. . . . . . . . . . . . . . . 8
1.4 Sensors in process and auxiliary circuits with high conductivity. . . . . . . .  10
1.5 Compact systems for conductivity measurement. . . . . . . . . . . . . . . . . . . . .  11
1.6 Types of transmitters for conductivity measurement . . . . . . . . . . . . . . . . .  12
1.7 Conductivity transmitters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.8 Types of assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
1.9 Flow and insertion assemblies for conductivity sensors. . . . . . . . . . . . . . .  18
1.10 Immersion assemblies for conductivity sensors . . . . . . . . . . . . . . . . . . . . . .  20
1.11 Retractable assemblies for conductivity sensors. . . . . . . . . . . . . . . . . . . . . .  21

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2. Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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3. Selecting the right conductivity sensor. . . . . . . . . . . . . . . . . . . . . . . 24
3.1
3.2
3.3
3.4
3.5
3.6
3.7

Flow chart for selecting conductivity sensors. . . . . . . . . . . . . . . . . . . . . . . .  24
Ultrapure and pure water applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
Water for injection (WFI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
High-pressure/high-temperature and pure water applications. . . . . . . . .  30
Chemical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
Hygiene applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
Water and wastewater applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4. Life cycle management of measuring points. . . . . . . . . . . . . . . . . . 38
4.1
		
4.2
4.3
4.4

Optimum laboratory calibration concept thanks to Memosens andMemobase Plus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
Calibrating conductivity sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
Conducal CLY421 calibration set for conductivity sensors. . . . . . . . . . . . . .  40
Steam/water analysis systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41

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1. Conductivity sensors and types of installation
1.1 Sensor types (inductive, conductive, two and four electrodes)

Conductive sensors
These sensors have a straightforward
design, offer a high degree ofmeasuring sensitivity and can thus
be used in applications ranging
from ultrapure water to drinking
water and beyond. The measuring
principle basically involves twoelectrodes positioned opposite eachother. An alternating voltage isapplied, which generates a current
flow in the medium. The more freely
moving charge carriers present in
the liquid, the greater the electrolytic
conductivity and current flow. In
order to calculate the electrolytic
conductivity, it is necessary to
determine the cell constant. The cell
constant is based on the geometryof the electrode arrangement anddescribes the ratio of the distance

between the electrodes to theirsurface area. The cell constant varies
depending on the design of the sensor
and is therefore suitable for a range ofapplications.

Conductive four-electrode
Memosens sensor
A high concentration of freely moving
charge carriers in the medium resultsin the generation of electrostaticforces. These cause the charge carriers
to repel each other and the measured
current flow to decrease, even though
the conductivity value should actually
increase. This effect is referred to aspolarization. In the case of sensors
with two electrodes, the polarization
effect causes an erroneously low
conductivity reading. Four-electrodeconductivity sensors compensate forthis effect by having two additional
electrodes measure the voltage dropin the medium during polarizationand pass this information on to thetransmitter. The transmitter thendisplays the corrected value. The fourelectrode method is therefore suitable

for applications in which a broadmeasuring range is required.

Endress+Hauser offers a variety of
conductive conductivity sensors,which come in different materials
and designs and therefore havedifferent cell constants. The lower
the conductivity, the lower the chosencell constant. For ultrapure water,
for example, it is preferable to haveconcentrically arranged cylindricalelectrodes. Since the conductivity isalso dependent on the temperatureof the medium, this is typicallymeasured in parallel and calculated
automatically in the transmitter.

What makes the four-electrode
Memosens sensor unique is its
innovative, ceramic sensor elementwith platinum electrodes. The
advantage of these materials is thatthey all behave in very similar ways in
the event of changes in temperature,with the result that the sensor
remains permanently gap-free. The
unique hygienic design guarantees
not only cleanability, but also aseptic
hygiene. It comes with EHEDG and
3-A certification and complies withthe pharmaceutical requirementsof the FDA and USP Class VI. In
addition, a novel electrode connection
surveillance function guarantees
reliability.

Video on conductivity measuring principles
www.endress.com/conductivity

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Inductive sensors
An electromagnetic transmitter coilcauses a voltage to be induced in
the medium. This excites the ions in
the medium, causing an alternating
electric current to flow. This in turngenerates a magnetic alternating fieldin the receiver coil, causing current
to flow here too. This current isanalyzed in the transmitter and used
to determine the conductivity value.
The current strength and conductivity
increase with the number of free ionspresent in the medium.

Different types of inductive sensors
are available. For example, thereis the particularly robust CLS50D
made of PEEK or PFA, or CLS54Dwith its certified hygienic design. All
inductive sensors have the advantage
of being galvanically isolated fromthe medium, which means thatthe transmitter and receiver coils
are sheathed in a protective plastic
coating. Therefore, there are nopolarization effects and the measuring
principle is resistant to contamination.

Compact conductivity measuringsystems
Compact devices, consisting of an
inductive conductivity sensor and atransmitter, are ideally suited to thefood and beverage industry as wellas to the life sciences industry. All
combinations are interference-free,easy to operate and offer a hygienic
design. This protects your products
and processes from contamination.

Smartec
The compact systems for measuringconductivity are smart, cost-effective
solutions. The IO-Link option of
Smartec CLD18 allows for simple andefficient integration into your plant
infrastructure.

Revolutionary Memosens
technology
Conductivity measurement has
become easier and more reliable
since Endress+Hauser has invented
Memosens. Inductive signal andenergy transmission without any
metallic contacts between sensor
head and cable connection ensurestrouble-free operation even in
humid environments. The storage ofcalibration data in the sensor headenables comfortable calibration in thelaboratory and quick sensor exchangeon site. Memosens 2.0 is leading
Memosens technology into the future.
It offers the perfect basis for IIoT
connectivity: You have the relevant
information on your measuring pointclose to hand using the right app.
Predictive maintenance 2.0: The
storage capacity for up to 8 times more
relevant data is an excellent basis forpredicting maintenance requirements.
Increased flexibility when configuring
the measuring point in hazardous
areas.

For more information, see section 4.1 on page 38 or go towww.endress.com/memosens

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1. Conductivity sensors and types of installation
1.2 Sensors in ultrapure, pure and process water applications

Conductive sensor
Condumax CLS12

Conductive sensor
Condumax CLS13

Power & Energy
Measuring range

0.04 to 20 µS/cm (k*= 0.01 cm )0.1 to 200 µS/cm (k*= 0.1 cm-1)

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)

Repeatability± 0.2 % of measured value ± 2 digits± 0.2 % of measured value ± 2 digits

Maximum measured error± 1.5 % of measured value ± 4 digits± 1.5 % of measured value ± 4 digits

Process temperature-30 to 160 °C-20 to 250 °C

Max. process pressure

41 barabs (up to 100 °C)
7 barabs (at 160 °C)

41 barabs

Electrodes(in contact with medium)

Both made of stainless steel
1.4571/316Ti

Both made of stainless steel
1.4571/316Ti

Shaft (in contact with medium)

Stainless steel 1.4571/316Ti

Stainless steel 1.4571/316Ti

Seals (in contact with medium)

EPDM, PEEK

Kalrez, ceramic

Certificates and approvals

Quality certificate, explosion
protection

Quality certificate, explosion
protection

Applications• For water/steam circuits(condensate) in the power andenergy industry• For water/steam circuits(condensate) in the power andenergy industry* k = cell constant
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Conductive sensor
Memosens CLS15E/CLS15

Conductive sensor
Condumax CLS19

Conductive sensor
Memosens CLS16E/CLS16

Life Sciences
Water

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)

0.04 to 500 µS/cm

CLS15E: ± 0.2 % of measured value
CLS15: ± 0.2 % of measured value± 2 digits± 0.2 % of measured value ± 2 digits

CLS16E: ± 0.2 % of measured value
CLS16: ± 0.2 % of measured value± 2 digits

CLS15E: ± 2 % of measured value
CLS15: ± 1.5 % of measured value± 4 digits± 1.5 % of measured value ± 4 digits

CLS16E: ± 2 % of measured value
CLS16: ± 1.5 % of measured value± 4 digits-20 to 120 °C (sterilization: 140 °C f. 1 h)

-10 to 60 °C-5 to 120 °C (sterilization: 150 °C f. 45 min)

13 barabs (up to 20 °C)
2 barabs (at 120 °C)

7 barabs (up to 20 °C)
1 barabs (at 60 °C)

0.1 up to 13 barabs (up to 20 °C)
9 barabs (at 120 °C)
6 barabs (at 150 °C)

Both made of polished stainless steel
1.4435/316L

Both made of stainless steel
1.4571/316Ti

Both made of electropolishedstainless steel 1.4435/316L

Polyethersulfone (PES)Polyethersulfone (PES)Electropolished stainless steel
1.4435/316L

EPDM

EPDM

FFKM (Isolast) FDA-compliant

Quality certificate, explosion
protection—

Quality certificate, explosion
protection, hygiene certificates• For monitoring and controlling ion
exchangers, reverse osmosis, coolingwater, distillation, boiler feedwater,condensate, chip cleaning• For pH measurement in power
plants using differential conductivity• For monitoring and controlling
ion exchangers, reverse osmosis,
distillation, chip cleaning• For water treatment and water for
injection (WFI)• For monitoring and controlling
ion exchangers, reverse osmosis,
distillation, chip cleaning7

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1. Conductivity sensors and types of installation
1.3 Sensors in process water and drinking water applications

Conductive sensor
Memosens CLS21E/CLS21

Water

8

Measuring range

10 µS/cm to 20 mS/cm

Repeatability

CLS21E: ± 0.2 % of measured value
CLS21: ± 0.2 % of measured value ± 2 digits

Maximum measured error

CLS21E: ± 5 % of measured value
CLS21: ± 1.5 % of measured value ± 4 digits

Process temperature-20 to 135 °C

Max. process pressure

17 barabs (up to 20 °C)
3.5 barabs (at 135 °C)

Electrodes (in contact withmedium)Both made of graphite

Shaft (in contact with medium)

Polyethersulfone (PES)

Seals (in contact with medium)

EPDM

Certificates and approvals

Quality certificate, explosion protection

Applications• For environmental applications• Drinking water treatment• Desalination systems• Industrial water treatment• Monitoring of bodies of water

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Conductive sensor
Memosens CLS82E

Food & BeverageLife Sciences

1 µS/cm to 500 mS/cm± 0.2 % of measured value± 4 % of measured value-5 to 120 °C (sterilization: 140 °C for 45 min)17 barabs (up to 20 °C)
9 barabs (at 120 °C)
6 barabs (at 140 °C)
Four electrodes made of platinum
Stainless steel 1.4435/316L, ceramic (zirconium oxide)
EPDM
Quality certificate, explosion protection, hygiene certificates• Downstream processes• Rinsing processes in life sciences applications• Phase separations• Chromatography• Fermentation• CIP monitoring in small pipes• Ultrafiltration

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1. Conductivity sensors and types of installation
1.4 Sensors in process and auxiliary circuits with high conductivity

Inductive sensor
Indumax CLS50D/CLS50

Inductive sensor
Indumax CLS54D

Chemicals
Water
Food & Beverage
Measuring range

2 µS/cm to 2000 mS/cm

200 µS/cm to 2000 mS/cm

Repeatability± 0.2 % of measured value± 0.2 % of measured value + 3 µS/cm

Maximum measured error< 100 °C: ± 0.5 % of measured
value + 5 µS/cm< 100 °C: ± 0.5 % of measured value+ 10 μS/cm, after calibration

Process temperature-20 to 180 °C (depending on
version)-20 to 125 °C(sterilization: 150 °C for 1 h)Max. process pressure

Up to 40 barabs (depending on
version)

0.1 to 13 barabs (up to 90 °C)
9 barabs (at 125 °C)
6 barabs (at 150 °C)

Shaft (in contact with medium)

PEEK or PFA

Food-safe PEEK

Seals (in contact with medium)

VITON or CHEMRAZFKM, EPDM

Certificates and approvals

Quality certificate, explosion
protection

Quality certificate, explosion
protection, hygiene certificates

Applications• Concentration measurementin acids and bases• Quality monitoring of chemical
products• Phase separation of product/
product mixtures• Inlet monitoring in wastewaterindustry• Monitoring of surface water• For hygienic applications• Phase separation of product/water and product/productmixtures in pipe systems• CIP process control/concentration
control• Product monitoring/quality
assurance in pipe systems andfilling plants

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1.5 Compact systems for conductivity measurement

Compact device (inductive)
Smartec CLD18

Compact device (inductive)
Smartec CLD134

Life Sciences
Food & Beverage
Measuring range

200 μS/cm to 1000 mS/cm

200 µS/cm to 2000 mS/cm

Repeatability± 0.5 % of measured value + 5 μS/cm + 2
digits± 0.2 % of measured value ± 2 digits

Maximum measured error± 2 % of measured value + 20 μS/cm± 1 % of measured value + 10 µS/cm +4 digits

Process temperature

Stainless steel: -10 to 110 °C(sterilization: 130 °C for 1 h); PVC: -10 to 60 °C-10 to 125 °C*(sterilization: 150 °C max. 1 h)Max. process pressure

Stainless steel: 13 barabs (up to 50 °C)
6 barabs (at 130 °C)
PVC: 9 barabs (up to 50 °C)
6 barabs (at 60 °C)

0.1 up to 13 barabs (up to 90 °C)
9 barabs (at 125 °C)
6 barabs (at 150 °C)*

Degree of protection

IP 69K/NEMA TYPE 6P

IP 67/Type 4

Shaft (in contact with medium)

PEEK

Food-safe PEEK

Seals (in contact with medium)

EPDM

FKM, EPDM

Number/output type

0/4 to 20 mA, conductivity andtemperature

0/4 to 20 mA, conductivity (concentration)and temperature, fieldbus communication

Communication

Analog, IO-Link

HART, PROFIBUS PA/DP

Mounting

Pipe, tank

Pipe, tank (remote/compact version)

Certificates and approvals

Quality certificate, hygiene certificates

Quality certificate, hygiene certificates

Applications• Phase separation of product/water andproduct/ product mixtures• CIP process control/ concentration control• Monitoring of industrial water• Rinsing processes in pickling plants• For hygienic applications• Phase separation of product/ water andproduct/ product mixtures• CIP process control/ concentration control• Product monitoring/ quality assurance*Depends on device version and ambient temperature11

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1. Conductivity sensors and types of installation
1.6 Types of transmitters for conductivity measurement

Liquiline CM44 and CM44R
The digital four-wire transmitter
provides up to eight channels. It iseasy and intuitive to operate withplain-text menus in 20 languages.
Since the transmitter can be used tomeasure 12 different parameters, you
can combine all Memosens sensors
in any way you choose. Memosens
technology already supplies anabundance of digital sensor data andprocess information and thus serves as
the basis for predictive maintenancefunctions.
Heartbeat Technology, which isavailable for Liquiline CM44, provides
continuous process and device
diagnostics, using functions such as
PCS (Process Check System), the CIP/

Liquiline CM42
Its straightforward, easy operation
with plain-text menus in 14 languages
is one of the outstanding advantagesof this two-wire transmitter. It is
suitable for applications in both
hazardous and non-hazardous
areas. The predictive maintenancefunction can be used in conjunction
with our Memosens sensors for the
purpose of displaying calibration
cycles, for example. It is extremely
easy to reconfigure the device fromconductivity measurement to the12

SIP counter, electrode connection
monitoring or a calibration timer, forexample. These functions help you to
optimize your maintenance strategy.
Heartbeat Technology also includes
verification routines and enables theautomatic generation of verification
reports.
The Liquiline CM44 provides up to
eight 0/4 to 20 mA current outputs,
up to four relays, as well as fieldbusessuch as HART, PROFIBUS DP, Modbus
TCP/RTU, EtherNet/IP and PROFINET.
The four-wire transmitter alsoenables convenient remote access via
Ethernet web servers. Liquiline CM44
is available as a field device and for
mounting in control cabinets and on
DIN rails.

measurement of pH or dissolved
oxygen; all you have to do is replacea sensor. Use the Liquiline M
transmitter or Memobase Plus tocalibrate the Memosens sensors
in a lab. The benefit to you isthat precalibrated sensors can be
replaced quickly in the process,which minimizes interruptions to
conductivity measurement. Available
outputs include FOUNDATION
Fieldbus and PROFIBUS PA in addition
to the 4 to 20 mA and HART output.

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Liquiline CM14
Liquiline CM14 is a basic transmitterthat provides all that you need torun a standard measuring point. It
fits in common cabinet cut-outs. The
Memosens hot plug and play concept

allows you to quickly install andcommission your digital sensors.

Liquiline Compact CM72/CM82
Liquiline Compact CM72 and CM82
are the smallest transmitters for
Memosens sensors and are attacheddirectly to the sensor without theirown power supply. As loop-powered
two-wire devices, Liquiline compact
transmitters can also be directly
connected to a programmable logic
controller (PLC), which serves as
the power supply. The compact
transmitters measure only 11 cm
long and 2 cm wide and, together
with the sensor, can fit into mostassemblies. Despite its slenderhousing, Liquiline Compact CM82
offers the complete flexibility andconfigurability of a multi-parametertransmitter. In addition, it is easy andreliable to operate and configure via
an encrypted Bluetooth connection
using a tablet or smartphone. Using
the SmartBlue app, you can see allmeasuring points that are within
the Bluetooth range of the device,
and configure them and generatediagnostics. Liquiline Compact CM72
and CM82 can be used in hazardousand non-hazardous areas. This meansthat measuring points in dangerous
or difficult to access locations can bechecked and configured from a safe
distance.

Liquisys CLM223/CLM253
The Liquisys transmitter is available
in two versions: the CLM223 model ismounted in a cabinet, while the CLM253
model is installed in a field housing.
Relay functions (e.g. neutralization
processes and spray cleaning function)
are optionally available.

0/4 to 20 mA-, HART or PROFIBUS
PA/DP outputs make it possible toconnect the device to your control
system. The transmitter is available
for measuring conductivity.

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1. Conductivity sensors and types of installation
1.7 Conductivity transmitters

Liquiline CM44/CM44R

Liquiline CM42

Parameters
measured

Conductivity, pH glass, pH ISFET, ORP,
disinfection, oxygen, turbidity, nitrate,
SAC, ammonium, sludge level, potassium

Conductivity, pH glass, pH ISFET, ORP,
oxygen

Input

Memosens, 4 to 20 mA, digital

Memosens, analog

ChannelsMax. 8 channels

Single-channel

Energy supply

24 V DC/AC (+20/-15 %)100 to 230 V AC, 50/60 Hz (± 15 %)12.5 to 30 V DC (HART/without HART)
9 to 32 V DC (fieldbus)

OutputMax. 8 analog 0/4 to 20 mA, max. 4 digital,
8 relays, alarm relay, fieldbus communication

Max. 2 analog 4 to 20 mA,
fieldbus communication

Display

Graphic display in plain text

Graphic display in plain text

Degree ofprotection

Field device: IP 66/67, NEMA TYPE 4X;
cabinet/DIN rail device: IP 20; display: IP 66

IP 66/67, NEMA Type 4X

Digital communication

HART, PROFIBUS DP, Modbus TCP/RTU,
EtherNet/IP, PROFINET, web server

HART, PROFIBUS PA, FOUNDATION
Fieldbus

Housing

Plastic

Plastic, stainless steel

Installation

Mast, railing, DIN rail, wall

Wall, mast, panel

Certificates andapprovals

Quality certificate, marine approval

Quality certificate, explosion protection

Features• Four-wire multi-parameter transmitter• Heartbeat Technology• Mathematical functions• Cleaning function, PID controller• Quick setup function• Modular extensibility, SD card
• Optional module allows connecting
sensors installed in hazardous areas• Two-wire transmitter• Quick setup function• Navigator• Replaceable sensor module• Sensor check system allows predictive
maintenance• Also suitable for analog sensors

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Liquiline CM14

Liquiline Compact CM72/CM82

Liquisys CLM253/CLM223

Conductivity, pH glass, ORP, oxygen

Conductivity, pH glass, pH ISFET, ORP,
oxygenConductivity

Memosens

Memosens plug-in head

AnalogSingle-channel

Single-channel

Single-channel

24 V to 230 V AC/DC universal power
supply unit

12.6 to 30 V DC

100/115/230 V AC
24 V AC/DC

Max. 2 analog 0/4 to 20 mA,
2 relays used as limit switches

1 analog 4 to 20 mA

2 analog 0/4 to 20 mA (linear,
optional user-defined curve), alarm
relay, up to four additional relays

Two-line, dot matrix LCD, 7-segment

Red and green LED

Two-line, LCD

Front: IP 65, NEMA Type 4X;
housing: IP 20

IP 67/68 , NEMA type 6

Field device: IP 65, NEMA type 4X;
panel-mounted instrument: IP 54(front), IP 30 (housing)-

CM82: Bluetooth®, HART

HART, PROFIBUS PA, PROFIBUS DP

Plastic

PEEK

Plastic

Panel

Space-saving, directly on sensor

Wall, mast, panel

Quality certificate

Quality certificate, explosion
protection, radio approvals

Quality certificate• Four-wire transmitter• Compact device for cabinets• Two-wire transmitter• Easy operation/commissioning• Bluetooth connection• Can be operated and configured via
SmartBlue app• Space-saving installation in assemblies• Four-wire transmitter• Cleaning by timer, Chemoclean,
PID controller

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1. Conductivity sensors and types of installation
1.8 Types of assembly

Immersion assemblies
These types of assembly are usedprimarily for installation in open vessels
and channels, usually in wastewater
treatment plants or in the chemicalindustry. They are always a good choicein cases where installation is possible
only from the top of the vessel.
DipfitThe standard version, CLA111, which
is made of polypropylene (PP), is usedmainly for measurements in the water,

Modular immersion assemblies
These types of assembly offer real
benefits in immersion applications
such as those found in the wastewaterindustry. They are suitable for sensors
with different connection threads.
This means that they can be used not
only for 12 mm sensors for measuringconductivity, pH or oxygen, but also
for turbidity or nitrate sensors. The
system can be installed using different
pipes, brackets, etc. in almost any
mounting location (pipes, rails, etc.).
Flexdip
The Flexdip CYA112 is used for
installation in open vessels andchannels. These assemblies areusually found in wastewater treatment

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wastewater and utilities industries.
In addition, we also offer the model
CLA140, which is made of PVDF or
stainless steel and was designed for
applications under harsher conditions(e.g. in the chemical industry). There
are different immersion lengths
available; both assemblies canaccommodate up to three sensors for
redundant measurements. An optional
spray cleaning system can be installed
in both assemblies (CPR30/CPR31).

plants. The modular system allows
an optimum configuration for eachmeasuring application.
• Stainless steel or PVC versions• Assembly lengths of 600 mm(23.6”) to 3600 mm (142”) in
increments of 600 mm (23.6”)• 	Float assembly for varying waterlevels• Quick-fastening elements for:– fast installation and exchangeof Memosens sensors with 		
inductive plug-in head– twist-free installation of 		
fixed-cable sensors– alignment of sensors.

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Insertion assemblies
Fixed installations with insertion
assemblies are found particularly inbatch processes, where the user needs
to have access to the conductivity
sensor between two batches. These
assemblies are often used in life
sciences and food production.

Unifit
The CPA842 is a stainless steel
assembly for the food and life sciencesindustries. Various options, inparticular hygienic clamp connections,are available for the processconnection. For special hygiene
requirements, a certified hygiene
design with the appropriate surface
roughness, as well as certificates inaccordance with EHEDG, 3-A, ASME
BPE and Pharma CoC, are available.

Flow assemblies
Flow assemblies can be used for
installation in process pipes orbypasses. These configurations areoften found in water works, in thebeverages industry, the chemicalindustry or in analytical cabinets in
power plants.

Flowfit
The CPA25, which is made ofpolypropylene (PP), is excellently
suited for use in water and wastewater
treatment. The robust CPA240 is alsoavailable in chemically resistant PVDF
or stainless steel and was designed forthe measurement of ultrapure water(prevents electrostatic charging). For
both assemblies we offer three sensor
slots as well as the option to upgrade
to chemical spray cleaning.

Retractable assemblies
The main advantage of retractableassemblies is that the sensor
replacement or cleaning process canbe performed quickly and easily andwithout interrupting the process.
They can be installed or removed
either manually or automatically(pneumatically).

Cleanfit
In addition to manual and automatic
options, we also offer different
materials, sealing strategies andsafety functions so that the system
can be fully customized to yourapplication. For safety reasons, several
pneumatically operated retractableassemblies can be fitted with a ballvalve.

17

A

1. Conductivity sensors and types of installation
1.9 Flow and insertion assemblies for conductivity sensors

Flowfit CPA240

Flowfit CPA25

Flowfit CYA27

For sensor

CLS82E

CLS82E

CLS82E

Max. processpressure

Stainless steel: 11 barabs at
150 °C; PVDF: 9 barabs at
50 °C, 1 barabs up to 120 °C

7 barabs at 20 °C
1 barabs at 80 °C

5 barabs

Process temperature Stainless steel: -15 to 150 °C
PVDF: 0 to 120 °C

0 to 80 °C

0 to 60 °C

Materials(in contact withmedium)

PVDF, stainless steel
1.4404/316L

Polypropylene (PP)

PMMA, PVDF, PVC, Titanium,
stainless steel 1.4404/
1.4571 (316L/316TI)

Seals (in contact withmedium)

EPDM, Viton, Chemraz,
Fluoraz

FKM, EPDM

FPM (FKM), PVDF, PVC

Sensor connections

3 x PG 13.5

3 x PG 13.5

6 x PG 13.5

Process connections

Weld-in adapter for DN-25
pipe; flange DN 25 PN 16;
flange ANSI 1" 150 lbs;
flange JIS 10K 25A; thread
FNPT ½”

Thread G 1”; thread
NPT 1”

Thread G 1/4“Cleaning

Spray cleaning connection
G ½"

Spray cleaning CPR31,
Chemoclean CPR3

Optional cleaning anddosing module

Comments

PAL (potential matching)for C4 alloy; tantalum

PWIS-free version
available

Multiparametermeasurements, sample flowof only 5 l/h for a precise
measurement

Applications

Water, boiler feedwater,
ultrapure water and coolingwater, gas scrubbers,
petrochemical industry

Water, wastewater
treatment or utilities

Drinking and processwater, saltwater, swimming
pool water, bypass
measurements

18

A

Unifit CPA842

Flowfit CLA751

Flowfit CLA752

Flowfit CYA21

CYA680

CLS82E

CLS12, CLS13,
CLS21E

CLS12, CLS13,
CLS21E

CLS15E, CLS19,
CLS82E

CLS82E

17 barabs

13 barabs

7 barabs up to 90 °C

17 barabs

Stainless steel:
17 barabs
PVDF: 5 barabs-15 to 140 °C

0 to 150 °C

0 to 90 °C

0 to 100 °C

0 to 130 °C

Stainless steel
1.4435/316L

Stainless steel
1.4571/316L

Polypropylene (PP)

Stainless steel
1.4404/316L

Stainless steel
1.4404/1.4435(316L), PVDF

EPDM-FDA, FKM, FKMFDA, silicone FDA--

Sensor-specific

EPDM, Kalrez, Viton(all FDA-compliant)

1 x PG 13.5

Thread G 1

Thread G 1

1 x PG 13.5; NPT ½"

2 x PG 13.5

DN 25 standard and for
B.Braun connection; TriClamp connections 1,5"’
and 2"; sanitary connection
DN 50 DIN11851; Varivent
DN 40-125/0.4"’

DN 20 with couplingnut G1

DN 20 with internal
thread G ½

Piping, 6 mm outer
diameter (OD) for
commonly used pipe
union systems

Tri-Clamp ¼“, ½“, ¾“,
1“, 1 ½“, 2“

-

-

-

-

-

EHEDG approval with Ra =< 0.76 µm or < 0.38 µm;
3-A; FDA-compliant,
explosion protection--

Compact version for
applications where
space is restricted; low
volume: 69 ml

For applications where
small diameters are
requiredIn-line measurement,
CIP/SIP, food, water, life
sciences, chemicals

Condensate
measurement

Bypassmeasurements

Water, boiler
feedwater, ultrapure
water, cooling water

Life sciences, CIP/SIP,
chemicals, chromatography, filtration,
reverse osmosis

19

A

1. Conductivity sensors and types of installation
1.10 Immersion assemblies for conductivity sensors

Flexdip CYA112

Dipfit CLA111

Dipfit CLA140

For sensor

CLS21E, CLS50D

CLS21E, CLS50D

CLS21E, CLS50D

Max. processpressure

1 barabs

5 barabs at 20 °C,
1 barabs at 80 °C

Stainless steel: 10 barabs
PVDF: 6 barabs

Process temperature

0 to 60 °C-10 to 80 °C

Stainless steel:-15 to 150 °C
PVDF: 0 to 120 °C

Materials(in contact withmedium)

PVC, stainless steel
1.4404/316L

Polypropylene (PP)

PVDF, stainless steel
1.4404/316L

Seals(in contact withmedium)

EPDM

EPDM

EPDM, Viton, Chemraz,
Fluoraz

Sensor connections

Thread G ¾”, 1"; thread
NPT ¾"; 1 x PG 13.5

Thread G ¾”, 1"; thread
NPT ¾"

Thread G ¾", 1"; thread
NPT ¾"

Process connections

Floater; chain;rail mounting

Flange DN 100; adjustableflange DN 100;suspension bracket

Without; flange DN 80/
PN 16; flange ANSI 3"/150
lbs; flange JIS 10K 80A

Cleaning-

External spray cleaning
CPR30
Internal spray cleaning
CPR31

External spray cleaning
CPR30
Internal spray cleaning
CPR31

Comments

Modular system,
extensive range ofaccessories--

Applications

Water/wastewater
treatment, plant design,
open channel, basin, open
tanks and process vats

Water/wastewater

Chemical industry,
petrochemical industry,
power plants, metalindustry20

A
1.11 Retractable assemblies for conductivity sensors

Cleanfit CPA871

Cleanfit CPA450

CTSP-LA2xxx

For sensor

CLS82E

CLS82E

CLS15E, CLS21E, CLS50D

Max. processpressure

17 barabs (depends on
version)5 barabs at 120 °C
13 barabs (static)

4 barabs at 100 °C (static)
2 barabs (in motion)

Process temperature-10 to 140 °C(depends on version)-15 to 130 °C

0 to 100 °C

Materials(in contact withmedium)Stainless steel 1.4404/316L,
Alloy C22 PEEK, PVDF, PVDF
conductive

Stainless steel 1.4404/316L,
Alloy C22 , titanium

Stainless steel 1.4404/316L,
Hastelloy, titanium

Seals(in contact withmedium)

EPDM, FKM/FFKM

EPDM, FKM, FFKM

EPDM, Viton, Kalrez,
Chemraz

Operation

Manual/pneumatic

ManualManualSensor connections

PG 13.5

PG 13.5

On request

Process connections

Clamp 2", 2½"; flange DN
40, DN 50, DN 80; flange2", 3" (ASME B16.5); flange
JIS 10K50, 10K80; thread
NPT 1½"; thread G 1¼“; dairy
fitting DN 50, DN 65

G1½“ internal; G1¼“ external;
NPT 1¼“ external; flange
DN32 Iso 1092-1; flange
ANSI 1¼“; G1¼“ internal; NPT
1¼“ external; M-NPT 1½“
external; flange ANSI 2“On request

Process seal

O-rings (2x)Ball valve

With/without ball valve

Comments

Immersion chamber version,
3.1 certificate

Safety kit for higher processpressures, 3.1 certificate-

Applications

Water, wastewater,process industry

Water, wastewater,process industry

Chemical, paper andprocess industry

21

A

2. Checklist

Customer contact data:
Name:

Company:

E-mail:Tel.:Please complete

MediumConductivity value
Concentration
Acids
Bases

Process data

Process temperature
Max. process pressure

Processconnection

Connection type/size

Installation

Ambient temperature
Installation in pipes
Installation in vessels

Transmitters

2-/4-wire
Degree of protection
Digital communication(HART, PROFIBUS, FOUNDATION
Fieldbus)
Dosage to be controlled bytransmitter?
Automatic cleaning?
Could cleaning medium
contaminate medium being
measured?
Multi-channel device

Device approvals/
certificates

Ex (Ex ia, Ex d)
EHEDG
3-A
FDA-listed material
3.1 certificate

22

Notes

A
Specific requirements/short description of application/drawing:23

3. Selecting the right conductivity sensor
3.1 Flow chart for selecting conductivity sensors

B

Ultrapureand purewater
applications

WFI

Hightemperature/
pure water
applications

Chemicalapplications

Hygieneapplications

When selecting the appropriate conductivity sensor, the main
determining factor is the degree of conductivity of the solute in themedium in the real-life application. Depending on the requirements,
there are sensors specifically for measuring low conductivity and formeasuring medium to high conductivity. The degree of conductivity
is an indicator of the purity of water or the quantity of dissolved
salts in the water. Conductivity measurement can therefore also be
used to determine the concentration of substances in a medium.
To carry out a measurement requires the lowest possible intrinsic
conductivity of the pure medium as well as a dissolved substancethat has the ability to form ions. Only then can electrical current be
conducted and measured. The medium used in most applications iswater, which in its pure form has a very low intrinsic conductivity of
0.055 µS/cm at 25 °C.

START

Low conductivity
0.05 µS/cm - 500 µS/cm

Yes

Conductivity measurements have a wide range of application,from ultrapure water treatment and surface water monitoring
to concentration measurement in acids and bases. In the foodand beverage industry, conductivity sensors are used in productmonitoring and CIP control.
In addition to the degree of conductivity, the choice of sensor also
depends on process- and industry-specific requirements, such as thetemperature range, the need for explosion protection, or hygiene
regulations. As the number of requirements increases, the numberof suitable sensors decreases.
There are basically two approaches:a) Verify the suitability of a known sensor for a new application‣ Is my sensor also suitable for a different application?
b) Select a sensor that is recommended for the applicationin question‣ Which sensor is suitable for my application?
For approach a), please look for the appropriate sensor in sections
1.1 to 1.4, and check if the sensor meets the requirements of yourapplication.
For approach b), please follow the flow chart. From here, you will bedirected to the individual sections (3.2 – 3.7) where you will find therecommended sensor along with key advantages, application limits
and possible alternatives. The layout has been simplified in order toreduce the level of complexity. To obtain further information on asensor, please refer to the relevant overview (sections 1.1 to 1.4).

Water/
wastewater
applications

24

No

Medium andhigh conductivity
0.5 - 2000 mS/cm

Yes

B

Water treatment

Yes

No

Hygienic

Ion exchanger
Reverse osmosis
Distillation
Deionization

3.2
Ultrapure and pure water
applications
See page 26

WFI

3.3
WFI
See page 28

Boiler feedwater
Condensate monitoring
Leakage monitoring

3.4
High-temperature/
pure water applications
See page 30

Acid production
Acid scrubbers
Phase separation foremulsions
Pickling/etching bathmonitoring

3.5
Chemical applications
See page 32

CIP control
Salt bath monitoring
Buffer blending
Inlet monitoring

3.6
Hygiene applications
See page 34

Wastewater
WWTP inlet
Surface water
Monitoring
Drinking water

3.7
Water/wastewater
applications
See page 36

YesNo

Product monitoring

Process monitoring

Yes

Yes

Yes

No

Hygienic

No

Hygienic

Yes
No

Yes

Yes
Product monitoring

Hygienic

No25

3. Selecting the right conductivity sensor
3.2 Ultrapure and pure water applications
Suggestion

B

Ultrapureand purewater
applications

Conductive sensor
Memosens CLS15E/CLS15

Conductive sensor
Condumax CLS19

Advantages• Can also be installed in flow assembly• Easy cleaning of stainless steel electrodes• Two different cell constants available• Can be sterilized for a short time at 140 °C• Compact design• Analog and digital versions available• Low-priced alternative to CLS15 formoderate process conditions• Can also be installed in flow assembly• Easy cleaning of stainless steel electrodes• Two different cell constants available

Applications• Monitoring and control of ion exchangers,
reverse osmosis, cooling water,
distillation, boiler feedwater, condensate,chip cleaning• For pH measurement in power plants
using differential conductivity• Monitoring and control of ion exchangers

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-20 to 120 °C (sterilization: 140 °C for 1 h)

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-10 to 60 °C

13 barabs (up to 20 °C)
1 barabs (at 120 and 140 °C)

7 barabs (up to 20 °C)
1 barabs (at 60 °C)

Technical data
• Measuring range• Processtemperature• Max. processpressure* k = cell constant26

B

Ultrapureand purewater
applications27

3. Selecting the right conductivity sensor
3.3 Water for injection (WFI)
Suggestion

B

Conductive sensor
Memosens CLS16E/CLS16

Advantages• Hygienic• Certified according to EHEDG, Document 8• Replaceable seal
• Minimum immersion depth is sufficient• Easy cleaning of electropolished, stainless steel electrodes• Can be sterilized for a short time at 150 °C

Applications• Designed for the life sciences industry• For water treatment and water for injection (WFI)

WFI

Technical data
• Measuring range• Processtemperature• Max. processpressure

28

0.04 to 500 µS/cm-5 to 120 °C (sterilization: 150 °C for 45 min)
0.1 to 13 barabs (up to 20 °C)
9 barabs (at 120 °C)
6 barabs (at 150 °C)

B

WFI

29

3. Selecting the right conductivity sensor
3.4 High-pressure/high-temperature and pure water applications
Suggestion

B

Hightemperature/
pure water
applications

Conductive sensor
Condumax CLS12

Conductive sensor
Condumax CLS13

Advantages• High degree of thermal, chemical andmechanical resistance• Stainless steel electrodes• Can be used in superheated steam• Flow assembly CLA751 available• Large connection compartment for cables• Two different cell constants available• High degree of thermal, chemical andmechanical resistance• Stainless steel electrodes• Can be used in superheated steam• Can be used up to 250 °C• Large connection compartment for cables• Two different cell constants available

Applications• For water/steam circuits (condensate) in
the power and energy industry• For water/steam circuits (condensate) in
the power and energy industry

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-30 to 160 °C

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-20 to 250 °C

41 barabs (up to 100 °C)
7 barabs (at 160 °C)

41 barabs

Technical data
• Measuring range• Processtemperature• Max. processpressure* k = cell constant30

Conductive sensor
Memosens CLS15E/CLS15

B

Conductive sensor
Condumax CLS19• Can also be installed in flow assembly• Easy cleaning of polished stainless steel electrodes• Can be sterilized for a short time at 140 °C• Compact design• Two different cell constants available• Low-priced alternative for moderate process conditions• Monitoring and control of ion exchangers, reverse
osmosis, cooling water, distillation, boiler feedwater,condensate, chip cleaning• For pH measurement in power plants using differential
conductivity• Monitoring and control of ion exchangers

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-20 to 120 °C (sterilization: 140 °C for 1 h)
13 barabs (up to 20 °C)
1 barabs (at 120 and 140 °C)

0.04 to 20 µS/cm (k*= 0.01 cm-1)
0.1 to 200 µS/cm (k*= 0.1 cm-1)-10 to 60 °C
7 barabs (up to 20 °C)
1 barabs (at 60 °C)

Hightemperature/
pure water
applications31

3. Selecting the right conductivity sensor
3.5 Chemical applications

B

Chemicalapplications

Suggestion
Inductive sensor
Indumax CLS50D/CLS50

Advantages• Broad measuring range• High chemical resistance due to PFA coating• PEEK version for temperatures up to 180 °C• Robust design• Resistant to contamination• Large sensor opening

Applications• Designed for the chemical industry• Concentration measurement in acids and bases• Quality monitoring of chemical products• Phase separation of product/product mixtures• Inlet monitoring in wastewater industry• Monitoring of surface waters

Technical data
• Measuring range• Processtemperature• Max. processpressure32

2 µS/cm to 2000 mS/cm-20 to 180 °C (depends on sensor version)
40 barabs (depends on sensor version)

B

Chemicalapplications33

3. Selecting the right conductivity sensor
3.6 Hygiene applications
Suggestion

B

Hygieneapplications

Conductive sensor
Memosens CLS82E

Inductive sensors
Indumax CLS54D/CLS54 andSmartec CLD134

Advantages• Applications with broad measuring range• Certified in accordance with EHEDG
and 3-A• FDA-compliant• Product monitoring and rinsing using
a single sensor• Easy cleaning due to electropolishedsurfaces• Can be sterilized up to 140 °C• Stainless steel shaft• Hygienic design without gaps or joints• With food-safe PEEK
• Fully encapsulated, sealless design• Available in two sizes• Very low surface roughness Ra ≤ 0.8 μm• Also available as compact device withtransmitter

Applications• For life science and food industries• Downstream processes• Rinsing processes in pharmaceuticalapplications• Phase separations• Chromatography• Fermentation• CIP monitoring in small pipes• Ultrafiltration• For hygienic applications in the foodindustry, life sciences and biotechnology• Phase separation of product/water andproduct/product mixtures• CIP process control/concentration
control• Product monitoring/quality assurance

1 µS/cm to 500 mS/cm-5 to 120 °C (sterilization: 140 °C for 45 min)

200 µS/cm to 2000 mS/cm-20 to 125 °C (sterilization: 150 °C for 1 h)

17 barabs (up to 20 °C)
9 barabs (at 120 °C)
6 barabs (at 140 °C)

0.1 to 13 barabs (up to 90 °C)
9 barabs (at 125 °C)
6 barabs (at 150 °C)*

Technical data
• Measuring range• Processtemperature• Max. processpressure*Depends on device version and ambient temperature

34

B

Compact device (inductive)
Smartec CLD18• Alternative to CLD134• Compact design• With food-safe PEEK
• Compact device with transmitter• Small sensor head for installation where space istight• Designed for hygienic applications• For the food industry, life sciences and biotechnology• Phase separation of product/water and product/
product mixtures in pipe systems• CIP process control/concentration control• Monitoring of industrial water• Rinsing processes in pickling plants

200 μS/cm to 1000 mS/cm
Stainless steel: -10 to 110 °C (sterilization: 130 °C
for 1 h)
PVC: -10 to 60 °C
Stainless steel: 13 barabs (up to 50 °C)
6 barabs (at 130 °C)
PVC: 9 barabs (up to 50 °C)
6 barabs (at 60 °C)

Hygieneapplications35

3. Selecting the right conductivity sensor
3.7 Water and wastewater applications
Suggestion

B

Conductive sensor
Memosens CLS21E/CLS21

Inductive sensor
Indumax CLS50D/CLS50

Advantages• Broad measuring range• Robust, durable PES housing• CLS21 available with plug-in head or
fixed cable• Can also be installed in flow assembly• Broad measuring range• Robust design• Resistant to contamination• Large sensor opening

Applications• For environmental applications• Drinking water treatment• Desalination systems• Industrial water treatment• Monitoring of surface waters• Suitable for wastewater• For heavily contaminated applications• Inlet monitoring in wastewater industry• Monitoring of surface waters

10 µS/cm to 20 mS/cm-20 to 135 °C
17 barabs (up to 20 °C)
3.5 barabs (at 135 °C)

2 µS/cm to 2000 mS/cm-20 to 180 °C (depends on sensor version)
40 barabs (depends on sensor version)

Technical data
• Measuring range• Temperature range• Max. pressure

Water/
wastewater
applications

36

B

Conductive sensor
Memosens CLS82E• Applications with broad measuring range• Certified in accordance with EHEDG
and 3-A• FDA-compliant• Product monitoring and rinsing using
a single sensor• Easy cleaning due to electropolished surfaces• Can be sterilized up to 140 °C• Stainless steel shaft• Suitable for wastewater• Ultrafiltration• Suitable for small pipe diameters and narrow, spacelimited installations

1 µS/cm to 500 mS/cm-5 to 120 °C (sterilization: 140 °C for 45 min)17 barabs (up to 20 °C)
9 barabs (at 120 °C)
6 barabs (at 140 °C)

Water/
wastewater
applications37

4. Life cycle management of measuring points
4.1 Optimum laboratory calibration concept thanks to Memosens andMemobase Plus
Important maintenance measures such as sensor
calibration can then take place in the comfortablesurroundings of the laboratory – under constantand perfect conditions and with all of thenecessary tools available there. This is much
faster than at the site where the sensor is used in
the process.

With Memosens technology, analog signals areconverted to digital signals directly in the sensor.
This is why the sensor is also the only component
that must be checked and calibrated regularly.
The cable and transmitter do not affect themeasured value unlike in an analog system which
can be sensitive to moisture and electromagnetic
interferences.

The perfect complement to this is Memobase Plus
software, which supports the concept of laboratory
calibration. This sensor and data management
software allows you to calibrate and check yoursensors very easily. Furthermore, Memobase Plus
saves all of the sensor and calibration data in a
database, enabling the automatic generation ofvisualizations and reports and the export of data. In
addition to conductivity sensors, the software also
supports pH electrodes as well as sensors for ORP
and dissolved oxygen. Memobase Plus is available in
12 languages.

Memosens sensors not only calculate and transfer
the measured value but also save additional
process data. This data can include operating
hours at higher temperatures, for example, or
maximum temperatures occurring in the process.
This information enables predictive maintenance.
Using Memosens technology, you can therefore
replace the sensor quickly and easily in theprocess with a clean, pre-calibrated sensor. The
measured value controlling your process is thus
available immediately once again.

o
lab
to

ry

clean
ing
/re
ge

process

Memobase Plus

38

ne
ra
t
n
io

Complete, seamless documentation:
Life cycle of Memosens sensorsorat

4.2 Calibrating conductivity sensors

The cell constant of a conductivity sensor mustbe accurate if the measuring point is to achievea high level of accuracy. That is why Endress+Hauser
individually calibrates, adjusts and certifies thecell constant for each conductivity sensor while itis still in the factory.
Furthermore, with our traceable calibration standards(CLY11), we will provide you with the support you
need to perform consistently accurate conductivity
measurements. The high degree of accuracy of thesecalibration solutions guarantees reliable validation ofyour conductivity sensors and therefore safeguards
the quality and reliability of your product. All CLY11
standards have a quality certificate and are traceable
to internationally recognized standards, such as NIST
and PTB. They thus comply with all documentation
guidelines.

CLY11 calibration standards
for conductivity sensors

Our wide range of calibration solutions with varying
conductivity values ensures that you can calibrate allof your conductivity sensors as easily as possible.

394. Life cycle management of measuring points
4.3 Conducal CLY421 calibration set for conductivity sensors

The Conducal CLY421 portable reference calibrationis the ideal calibration tool for conductivity
measuring devices in ultrapure water applications.
It provides certified comparison measurements andfull traceability of your instruments' verificationand calibration. Furthermore, the tool is fullycompliant with the requirements of the life sciencesindustry. The Conducal comes in a robust, portablehardshell case with a battery-powered Liquilinetransmitter, enabling flexible calibration of yourmeasuring devices, even in the field.

Advantages• Factory calibration traceable to standard referencematerial NIST, PTB and DAkkS• Factory calibration of Conducal system according to
ASTM D-5391• Flow assembly with adjusting and monitoring
functions according to ASTM D-5391• Accurate calibration by direct use of process sample
and comparison with reference system• Rapid setup of comparison measurement withpractical flow assembly• Flexible calibration in the field with carry case andbattery-operated Liquiline transmitter

40

Application

The Conducal CLY421 is a portable calibration andverification tool for quality-relevant conductivity
measurements. It is suitable for all ultrapure water
applications up to 20 µS/cm:• Life sciences industry• Food industry• Semiconductor industry
Its traceability to national standards (NIST, PTB and
DAkkS ) fulfills the most stringent legal requirements.

4. Life cycle management of measuring points
4.4 Steam/water analysis systems

In industrial processes, vast quantities ofenergy are required for steam production inparticular. The use of high-quality water in boiler
applications at power plants and public utility
companies prevents corrosion and buildup. Thisguarantees a high degree of boiler efficiency,
which in turn contributes to energy savings.

Endress+Hauser offers the full range of devices
needed to analyze the pure water used in thesetypes of boiler applications. Since the pressure
and temperature in most cases are too high forthe measurement to be performed directly inthe process, it is necessary to install a sample
preparation upstream from the analyticalcabinets. Sample preparation systems are also
included in Endress+Hauser's product range.

41

Notes42

Notes43

Supplementary documentation• Parameter Overview
FA00007C/07/en
Products

Solutions

Services

Experts in Liquid Analysis

Sensors, transmitters,compact devices and assemblies
Experts in Liquid Analysis

Links• Product selection via application parameters(product tool: Applicator)
www.endress.com/applicator• Overview of all components
www.endress.com/conductivity• Memosens technology
www.endress.com/memosens

12.07/MC

CP01313C/07/en/02.23

www.addresses.endress.com