Endress+Hauser Liquiline CM42 Technical specifications

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Brief Operating Instructions
Liquiline CM42
Two-wire transmitter for pH/ORP, conductivity or
oxygen
Measurement with digital or analog sensors
These instructions are Brief Operating Instructions; they are
not a substitute for the Operating Instructions pertaining to
the device.
Detailed information on the device can be found in the
Operating Instructions and in the other documentation
available at:
• www.endress.com/device-viewer
• Smart phone/tablet: Endress+Hauser Operations App
KA01481C/07/EN/01.21
71524766
2021-01-31

Liquiline CM42
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0040778

Liquiline CM42 Table of contents
Endress+Hauser 3
Table of contents
1 About this document .............................................................. 3
1.1 Symbols used ......................................................................... 3
1.2 Symbols on the device ................................................................... 4
2 Basic safety instructions .......................................................... 4
2.1 Requirements for personnel .............................................................. 4
2.2 Designated use ........................................................................ 4
2.3 Workplace safety ...................................................................... 5
2.4 Operational safety ......................................................................5
2.5 Product safety ......................................................................... 5
3 Incoming acceptance and product identification ................................... 6
3.1 Incoming acceptance .................................................................... 6
3.2 Product identification ................................................................... 6
3.3 Scope of delivery ....................................................................... 7
4 Installation ....................................................................... 7
4.1 Installation conditions ................................................................... 7
4.2 Mounting the measuring device ............................................................9
4.3 Post-installation check ................................................................. 12
5 Electrical connection ............................................................ 13
5.1 Connection conditions .................................................................. 13
5.2 Connecting the measuring device ......................................................... 20
5.3 Power supply and signal circuit ........................................................... 20
5.4 Sensor connection ..................................................................... 24
5.5 Ensuring the degree of protection ......................................................... 37
5.6 Post-connection check ..................................................................38
6 Operation options ............................................................... 39
6.1 Display and operating elements ........................................................... 39
6.2 Access to the operating menu via the local display ............................................. 40
6.3 Access to the operating menu via the operating tool ............................................ 41
7 Commissioning .................................................................. 42
7.1 Function check ....................................................................... 42
7.2 Basic setup .......................................................................... 42
1 About this document
1.1 Symbols used
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 Liquiline CM42
4 Endress+Hauser
1.2 Symbols on the device
Symbol Meaning
Reference to device documentation
Do not dispose of products bearing this marking as unsorted municipal waste.
Instead, return them to the manufacturer for disposal under the applicable
conditions.
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.
• Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the Operating Instructions provided must be carried out only
directly at the manufacturer's site or by the service organization.
2.2 Designated use
2.2.1 Areas of application
Liquiline M CM42 is a two-wire transmitter for liquid analysis in all areas of process
technology.
The main areas of application are:
• Chemical processes
• Pharmaceutical industry
• Food technology
• Applications in hazardous areas
The use of the transmitter depends greatly on the sensor that is used. It is essential to
adhere to the information concerning designated use in the Operating Instructions for
the sensor.
The transmitter is suitable for pollution degree 3 according to IEC/EN 61010-1.

Liquiline CM42 Basic safety instructions
Endress+Hauser 5
2.2.2 Non-designated use
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 Workplace 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 international standards for industrial applications.
• The electromagnetic compatibility indicated applies only to a product that has been
connected in accordance with these Operating Instructions.
2.4 Operational safety
Before commissioning the entire measuring point:
1. Verify that all connections are correct.
2. Ensure that electrical cables and hose connections are undamaged.
3. Do not operate damaged products, and protect them against unintentional operation.
4. Label damaged products as defective.
During operation:
‣If faults cannot be rectified:
products must be taken out of service and protected against unintentional operation.
2.5 Product safety
2.5.1 State-of-the-art technology
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
international standards have been observed.
2.5.2 IT security
We only provide a warranty if the device is installed and used as described in the Operating
Instructions. The device is equipped with security mechanisms to protect it against any
inadvertent changes to the device settings.
IT security measures in line with operators' security standards and designed to provide
additional protection for the device and device data transfer must be implemented by the
operators themselves.

Incoming acceptance and product identification Liquiline CM42
6 Endress+Hauser
3 Incoming acceptance and product identification
3.1 Incoming acceptance
1. Verify that the packaging is undamaged.
 Notify the supplier of any damage to the packaging.
Keep the damaged packaging until the issue has been resolved.
2. Verify that the contents are undamaged.
 Notify the supplier of any damage to the delivery contents.
Keep the damaged goods until the issue has been resolved.
3. Check that the delivery is complete and nothing is missing.
 Compare the shipping documents with 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.
Make sure to comply with the permitted ambient conditions.
If you have any questions, please contact your supplier or your local Sales Center.
3.2 Product identification
3.2.1 Nameplate
Nameplates can be found:
on the packaging (adhesive label, portrait format)
The nameplate provides you with the following information on your device:
• Manufacturer identification
• Order code
• Extended order code
• Serial number
• Firmware version
• Safety information and warnings
• Ex marking on hazardous area versions
• Certificate information
‣Compare the information on the nameplate with the order.
3.2.2 Manufacturer address
Endress+Hauser Conducta GmbH+Co. KG
Dieselstraße 24
D-70839 Gerlingen

Liquiline CM42 Installation
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3.3 Scope of delivery
The scope of delivery comprises:
• 1 transmitter in the version ordered
• 1 mounting plate incl. 4 flat head screws
• 1 set of adhesive labels (nameplate, terminal connection signs)
• 1 test certificate according to EN 10204-3.1 (optional)
• Operating Instructions Part 1 and 2, BA00381C and BA00382C, in the language ordered
• 1 manufacturer's certificate
‣If you have any queries:
Please contact your supplier or local sales center.
4 Installation
4.1 Installation conditions
4.1.1 Mounting plate
220 (8.66)
85 (3.35)
70 (2.76)
141 (5.55)
196 (7.72)
70 (2.76)
85 (3.35)
95 (3.74)
122°
2 x R8 2 x R3
R3
2 x R8
2 (0.08)
86 (3.39)
112 (4.41)
161 (6.34)
4 x Ø 6 (0.24)
2 x 11 (0.43)
4 x Ø 7 (0.28)
80 (3.15)
2 x R70
A0032497
 1 Dimensions in mm (inch)
4.1.2 Weather protection cover
NOTICE
Effect of climatic conditions: rain, snow, direct sunlight
Device damage to total device failure is possible!
‣When installing outside, always use the weather protection cover.

Installation Liquiline CM42
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For transmitter with plastic housing
100°
90°
224 (8.82)
151 (5.94)
98 (3.86)
98 (3.86)
253 (9.96)
107 (4.21)
230 (9.01)
A0032495
 2 Dimensions in mm (inch)
For transmitter with stainless steel housing
320 12.6( )
300 (11.8)
270 10.6( )
AB
1
4 x Ø 6.1 (0.24)
A0032496
 3 Dimensions in mm (inch)

Liquiline CM42 Installation
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4.2 Mounting the measuring device
4.2.1 Wall or field mounting
You have the following installation options:
• Wall mounting
• Mounting on a vertical pipe or post (round or square)
• Mounting on a railing or horizontal pipe (round or square)
Diameter of a pipe, post or railing suitable for mounting: 30 to 61 mm (1.18 to 2.40 ").
Wall mounting
A0010381
 4 Wall mounting of stainless steel version
A0043874
 5 Wall mounting of plastic version

Installation Liquiline CM42
10 Endress+Hauser
Mounting on a vertical pipe or post
1 2 3
4
5
A0010372
 6 Mounting example
1 Transmitter (illustrated in image: plastic version)
2 Mounting plate (included in the delivery)
3 Pipe or railing (circular/square)
4 Mounting plate (post retainer, accessory)
5 Threaded bolts with spring washer, washer and nut (included in the delivery of the post retainer)

Liquiline CM42 Installation
Endress+Hauser 11
Mounting on the horizontal pipe or railing
1 2 3
4
5
A0010370
 7 Mounting example
1 Transmitter (illustrated in image: stainless steel version)
2 Mounting plate (included in the delivery)
3 Pipe or railing
4 Mounting plate (post retainer, accessory)
5 Threaded bolts with spring washer, washer and nut (included in the delivery of the post retainer)
You require the post retainer to mount the device on a post, pipe or railing. This is an
accessory and not included in the scope of delivery.
4.2.2 Panel mounting
For panel mounting, you require the installation kit, consisting of tensioning screws and a
front seal. This is an accessory and not included in the scope of delivery.
• If devices are installed above one another, you must observe a minimum clearance for the
cable glands of the upper device in each case.
• If the devices are installed beside one another, you must observe a minimum clearance to
be able to open the front of the housing.
• If the devices are arranged in a square, you must take the lengths of the mounting plates
on the back of the device and the cable glands into consideration for the minimum
clearance.

Installation Liquiline CM42
12 Endress+Hauser
Plastic version
121 (4.76)
138 (5.43)
min. 30 (1.18)
220 (8.66)
76 (2.99)
A0043872
 8 Panel mounting: left side view, right front view, dimensions in mm (in)
Stainless steel version
121 (4.76)
138 (5.43)
min. 30 (1.18)
220 (8.66)
76 (2.99)
A0043870
 9 Panel mounting: left side view, right front view, dimensions in mm (in)
4.3 Post-installation check
1. After installation, check the transmitter for damage.
2. Check whether the transmitter is protected against precipitation and direct sunlight
(e.g. by the weather protection cover).

Liquiline CM42 Electrical connection
Endress+Hauser 13
5 Electrical connection
5.1 Connection conditions
5.1.1 Installation in hazardous areas
CM42-*E/I/J/K
1
7 6 5 4
3
2
4 … 20 mA
Zone 1Zone 0
8
A0032486
 10 Installation in hazardous area Ex ib (ia Ga)
1 Transmitter 5 Active barrier, e.g. RN221
2 HART handheld terminal 6 Supply and signal circuit Ex ib (4 to 20 mA)
3 FieldCare via PROFIBUS/FOUNDATION Fieldbus 7 Intrinsically safe sensor circuit Ex ia
4 Signal line HART/PROFIBUS/FOUNDATION
Fieldbus
8 Hazardous area version of sensor

Electrical connection Liquiline CM42
14 Endress+Hauser
CM42-*F
1
7 6 5 4
3
2
4 … 20 mA
Zone 22
8
Zone 2
A0032487
 11 Installation in hazardous area Ex tc (ic)
1 Transmitter 5 Active barrier, e.g. RN221
2 HART handheld terminal 6 Supply and signal circuit (4 to 20 mA)
3 FieldCare via PROFIBUS/FOUNDATION Fieldbus 7 Intrinsically safe sensor circuit
4 Signal line HART/PROFIBUS/FOUNDATION
Fieldbus
8 Hazardous area version of sensor

Liquiline CM42 Electrical connection
Endress+Hauser 15
CM42-*V
1
6 5 4
3
2
Zone 2
7
A0032488
 12 Installation in hazardous area Ex nA (ic)
1 Transmitter 5 Supply and signal circuit Ex nA (4 to 20 mA)
2 HART handheld terminal 6 Intrinsically safe sensor circuit Ex ic
3 FieldCare via PROFIBUS/FOUNDATION Fieldbus 7 Hazardous area version of sensor
4 Signal line HART/PROFIBUS/FOUNDATION
Fieldbus

Electrical connection Liquiline CM42
16 Endress+Hauser
CM42-*P/S
1
7 6 5 4
3
2
4 … 20 mA
8
Div. 1/2Zone 0
A0032489
 13 Installation in hazardous area FM/CSA
1 Transmitter 5 Active barrier, e.g. RN221
2 HART handheld terminal 6 Supply and signal circuit (4 to 20 mA)
3 FieldCare via PROFIBUS/FOUNDATION Fieldbus 7 Intrinsically safe sensor circuit
4 Signal line HART/PROFIBUS/FOUNDATION
Fieldbus
8 Hazardous area version of sensor

Liquiline CM42 Electrical connection
Endress+Hauser 17
CM42-*U
1
7 6 5 4
3
2
4 … 20 mA
Zone 1
8
A0032491
 14 Installation in hazardous area JPN
1 Transmitter 5 Active barrier, e.g. RN221
2 HART handheld terminal 6 Supply and signal circuit (4 to 20 mA)
3 FieldCare 7 Intrinsically safe sensor circuit
4 HART signal line 8 Hazardous area version of sensor
5.1.2 Opening the housing
NOTICE
Pointed or sharp tools
Damage to the housing seal, scratches on the housing or similar!
‣Do not use any sharp or pointed tools, such as a screwdriver or knife, to open the housing.

Electrical connection Liquiline CM42
18 Endress+Hauser
1.
Loosen the 4 screws on the front with a Phillips head screwdriver.
2.
≤180°
Open the housing.
Grounding the housing
Plastic housing
LWARNING
Electrical voltage at non-grounded cable mounting rail
No shock protection is provided!
‣Connect the cable mounting rail to the foundation ground using a separate ≥2.5 mm2 (14
AWG) functional ground.

Liquiline CM42 Electrical connection
Endress+Hauser 19
1 2
A0003617
 15 Grounding the housing
1
2
Cable mounting rail
≥2.5 mm2 (14 AWG) functional ground
Stainless steel housing
LWARNING
Electrical voltage at non-grounded housing
No shock protection is provided!
‣Connect the external ground connection on the housing to the foundation ground using a
separate cable (GN/YE) (≥2.5 mm2, 14 AWG).
1
2
A0003616
 16 Grounding the housing
1
2
External ground connection
≥2.5 mm2 (14 AWG) cable (GN/YE)

Electrical connection Liquiline CM42
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5.2 Connecting the measuring device
LWARNING
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.
5.3 Power supply and signal circuit
5.3.1 4 to 20 mA
‣Connect the transmitter with a shielded two-wire cable.
 The type of shield connection depends on the anticipated interference influence. To
suppress electrical fields, it suffices to ground the shield on one side. If you also want
to suppress interference from an alternating magnetic field, you must ground the
shield on both sides.
The second current output is optionally available (Product Configurator on
www.endress.com/cm42).
133
134
+
–
234 233 232 231 134 133 132 131
233
234
–
+
A0036491
 17 In-device view (CPU module)
+
–
133
134
4 ... 20 mA
+
–
233
234
4 ... 20 mA
Out 1
Out 2
A0003100
 18 Wiring diagram
The figures show the version with the shield grounded at both sides to suppress interference from an alternating magnetic
field.