Technical Information
TI 110C/07/en/12.02
50065951
Conductivity Sensors
ConduMax W CLS 19
Two-electrode sensors with
cell constants k = 0.01 cm–1 or k = 0.1 cm–1
Application
Measurement in pure and ultrapure
water:
• Monitoring ion exchangers
• Reverse osmosis
The measuring range of the sensors
depends on the cell constant k:
• k = 0.01 cm–1: 0.04 ... 20 µS/cm
• k = 0.1 cm–1: 0.1 ... 200 µS/cm
Sensors with a Pt 100 temperature sensor
are used together with the conductivity
measuring instruments Liquisys M
CLM 223/253 equipped with automatic
temperature compensation.
For measurement of specific resistance,
MΩ . cm measuring ranges are available
in the menues of these transmitters.
Your benefits
• Installation in pipes or flow chambers
• Pt 100 temperature sensor for
temperature compensation
• Compact design
• Very good price
Quality made by
Endress+Hauser
ISO 9001
ConduMax W CLS 19
Function and system design
Measuring principle
Conductive conductivity measurement
AC
The conductivity of liquids is measured with a
measuring system that has two coaxially
arranged electrodes like a capacitor.
The electric resistance or its reciprocal value,
the conductance G, is measured according to
Ohm’s law. The specific conductivity κ is
determined using the cell constant k that is
independent from the sensor’s geometry.
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Important properties
ConduMax W CLS 19
• Electrodes
•
•
•
•
2
ConduMax W CLS 19 has coaxial measuring electrodes made of polished, stainless
steel 1.4571 (AISI 316Ti).
Temperature sensor
In addition, a Pt 100 temperature sensor is installed to measure the medium temperature.
Easy connection
The sensors are connected via a 4-pole DIN-plug that can be secured with a screw. For
introduction of the measuring cable, the plug is equipped with a Pg 9 cable gland.
Installation
The sensor can be installed directly via the NPT ½" process connection.
Mounting the sensor in cross or T-pieces with DN 20 requires a PVC-threaded coupling that is
available as accessory.
For easy installation in cross or T-pieces with DN 32, 40 or 50, adapter couplings (made of PVC
for cementing) and a 1½" clamp coupling (made of PVDF) are available as accessories.
Durability
The sensor is pressure-proof up to 6 bar (at 20 °C) and can be applied with temperatures of up
to 60 °C (at 1 bar).
Endress+Hauser
ConduMax W CLS 19
Measuring system
A complete measuring system comprises:
• a CLS 19 conductivity sensor
• a transmitter, e.g. Liquisys M CLM 253
• a CYK 71 measuring cable
ENDRESS+HAUSER
LIQUISYS M
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Input
Measured values
Conductivity
Temperature
Cell constant k
Depending on ordered version:
k = 0.01 cm–1
k = 0.1 cm–1
Measuring ranges
Conductivity
k = 0.01 cm–1:
k = 0.1 cm–1:
Temperature
Temperature sensor
Pt 100
Cable specification
The ConduMax W is connected to the measuring transmitter using the special measuring cable
CYK 71.
(referenced to water at 25 °C)
0.04 µS/cm ... 20 µS/cm
0.1 µS/cm ... 200 µS/cm
–10 ... 60 °C
Cable
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Coax BK
Coax inner
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GN
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screen (outer electrode)
conductivity (inner electrode)
Pt 100
Outer screen
(PE measuring device)
Sensor Pin
n.c.
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ConduMax W CLS 19
Installation
Installation instructions
The sensors are mounted directly via the NPT ½" process connection.
Optionally, the sensors can be installed in cross or T-pieces.
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When mounting the sensor, make sure that the measuring surfaces are completely wetted by the
medium.
When working in ultrapure water, ingress of air must be avoided since dissolved air, particularly
CO2, may increase conductivity by up to 3 µS/cm.
Environment
Ingress protection
IP 65
Process
Process temperature
-10 ... +60 °C
Process pressure
6 bar (at 20 °C)
Pressure/temperature
load curve
[bar]
6
5
4
3
2
1
[°C]
-10
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ConduMax W CLS 19
Mechanical construction
Design, dimensions
2
1
3
NPT ½"
17
126
17
AF 36
73
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Weight
approx. 0.1 kg
Materials
Electrodes
Sensor shaft
Process connection
NPT ½" thread
Cable connection
Pg 9 cable gland
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stainless steel 1.4571 (AISI 316Ti)
PES (Polyethersulfone)
Ordering information
Product structure
ConduMax W CLS 19
Measuring range and cell constant
A
B
Measuring range: 0.04 ... 20 µS/cm (k = 0.01)
Measuring range: 0.1 ... 200 µS/cm (k = 0.1)
Process connection and materials
1A
Thread NPT ½", sensor shaft PES
Measuring cable connection
1
4-pole connector with Pg 9
Temperature sensor
A
D
CLS 19-
Endress+Hauser
Integrated Pt 100 temperature sensor
Without temperature sensor
complete order code
5
ConduMax W CLS 19
Accessories
Installation
❑ PVC-threaded coupling
For cementing in standard PVC cross or T-pieces with DN 20, with G ½ internal thread, selfsealing, ½” NPT sensor thread;
order no. 50066536
❑ PVC equalising sleeves AM
For adaptation of the PVC-threaded coupling to larger nominal diameters,
– AM 32
for installation into cross or T-pieces DN 32, order no. 50004738
– AM 40
for installation into cross or T-pieces DN 40, order no. 50004739
– AM 50
for installation into cross or T-pieces DN 50, order no. 50004740
❑ PVDF-threaded coupling
With G ½ internal thread and G 1 external thread,
pressure-proof up to 12 bar (20 °C), max. temperature 120 °C, incl. O-ring,
internal thread, self-sealing with NPT ½" sensor thread;
order no. 50004381
❑ Adapter clamp 1½"
made of PVDF for mounting the conductivity sensor in a clamp adaption;
order no. 50043781
Measuring cables
❑ Special measuring cable / extension cable CYK 71
for two-electrode conductivity sensors with built-in temperature sensor,
1 low-noise coaxial line, 4 auxiliary cores at 0,75 mm2 each with a common screen, outer
diameter 7 mm / 0,25"
Sold by the metre, minimum length 5 m
Length 5 m
Length 10 m
Length 50 m
Length 100 m
Order no. 50085333
Order no. 50088280
Order no. 50088281
Order no. 50088284
Order no. 50088285
❑ Junction box VBM
for cable extension, with 10 terminals, IP 65 / NEMA 4X
Cable entry Pg 13,5
Cable entry NPT ½"
Order no. 50003987
Order no. 51500177
Calibration solutions
❑ Calibration solutions
Precision solutions referred to SRM (Standard Reference Material) of NIST for qualified
calibration of conductivity measuring systems according to ISO, accuracy ± 0,5 %, with
temperature table,
– CLY 11-A
74 µS/cm (reference temperature 25 °C), 500 ml;
order no. 50081902
– CLY 11-B
149,6 µS/cm (reference temperature 25 °C), 500 ml;
order no. 50081903
Calibration set
❑ Calibration set ConCal
Conductivity calibration set for ultrapure water applications,
complete, factory-calibrated measuring set with certificate, traceable to SRM of NIST and DKD,
for comparative measurement in ultrapure water applications up to 10 µS/cm
– 230 V AC, order no. 50083777
– 115 V AC, order no. 50083778
❑ Recalibration ConCal
Factory recalibration and new issue of calibration certificate, traceable to SRM of NIST and
DKD, factory calibration procedure according to ASTM D-5391-93;
order no. 51502486
6
Endress+Hauser
ConduMax W CLS 19
Related products
❑ Conductive conductivity sensor ConduMax W CLS 15
For measurement in pure and ultrapure water,
for ordering information, see the CLS 15 Technical Information (TI 109C/07/en)
Documentation
Transmitters
❑ Liquisys M CLM 223/253, Technical Information TI 193C/07/en; order no. 51500279
Calibration solutions
❑ Precision calibration solution CLY 11, Technical Information TI 162C/07/en; order no. 50086574
ConCal
❑ ConCal, Technical Information TI 163C/07/en; order no. 50085983
Related products
❑ ConduMax W CLS 15, Technical Information TI 109C/07/en; order no. 50065950
Endress+Hauser
7
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Technische Büros in: Hamburg . Hannover . Ratingen . Frankfurt . Stuttgart . München . Teltow
08.02
TI 110C/07/en/12.02
50065951
Printed in Germany / FM+SGML 6.0 / DT
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Endress+Hauser
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