Endress+Hauser L20221 Technical specifications

Brief Operating Instructions
L20221, L20222
Temperature transmitter
L20221 with 4-20 mA analog output
L20222 with HART® communication
These Brief Operating Instructions are not a substitute for the
Operating Instructions pertaining to the device.
Detailed information can be found in the Operating
Instructions and the additional documentation.
KA01630O/09/EN/01.22-00
71599728
2022-11-15

Table of contents L20221, L20222
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Table of contents
1 About this document .............................................................. 2
1.1 Document function ..................................................................... 2
1.2 Safety instructions ..................................................................... 3
1.3 Symbols used ......................................................................... 3
1.4 Tool symbols ..........................................................................4
1.5 Registered trademarks .................................................................. 4
2 Basic safety instructions .......................................................... 5
2.1 Requirements for the personnel ............................................................ 5
2.2 Intended use .......................................................................... 5
2.3 Operational safety ......................................................................5
3 Incoming acceptance and product identification ................................... 6
3.1 Incoming acceptance .................................................................... 6
3.2 Nameplate ........................................................................... 6
3.3 Name and address of manufacturer ......................................................... 7
3.4 Scope of delivery ....................................................................... 7
3.5 Certificates and approvals ................................................................ 7
3.6 Storage and transport ................................................................... 8
4 Mounting ......................................................................... 9
4.1 Mounting requirements ................................................................. 9
4.2 Mounting the device ................................................................... 11
4.3 Post-installation check ................................................................. 15
5 Electrical connection ............................................................ 15
5.1 Connecting requirements ............................................................... 16
5.2 Quick wiring guide .................................................................... 17
5.3 Connecting the sensor cables ............................................................. 18
5.4 Connecting the transmitter .............................................................. 19
5.5 Special connection instructions ........................................................... 21
5.6 Post-connection check ..................................................................22
6 Operation options ............................................................... 23
6.1 Overview of operation options ............................................................ 23
6.2 Transmitter configuration ............................................................... 27
6.3 Access to the operating menu via the Wireless Field Device Configurator App ......................... 27
7 Commissioning .................................................................. 28
7.1 Post-installation check ................................................................. 28
7.2 Switching on the transmitter ............................................................. 28
1 About this document
1.1 Document function
The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.

L20221, L20222 About this document
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1.2 Safety instructions
When using in hazardous areas, compliance with national regulations is mandatory. Separate
Ex-specific documentation is provided for measuring systems that are used in hazardous
areas. This documentation is an integral part of these Operating Instructions. The installation
specifications, connection data and safety instructions it contains must be strictly observed!
Make sure that you use the right Ex-specific documentation for the right device with approval
for use in hazardous areas!
1.3 Symbols used
1.3.1 Safety symbols
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.3.2 Electrical symbols
Symbol Meaning Symbol Meaning
Direct current Alternating current
Direct current and alternating current Ground connection
A grounded terminal which, as far as
the operator is concerned, is grounded
via a grounding system.
Symbol Meaning
Potential equalization connection (PE: protective earth)
Ground terminals that must be connected to ground prior to establishing any other connections.
The ground terminals are located on the interior and exterior of the device:
• Interior ground terminal: potential equalization is connected to the supply network.
• Exterior ground terminal: device is connected to the plant grounding system.

About this document L20221, L20222
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1.3.3 Symbols for certain types of information
Symbol Meaning Symbol Meaning
Permitted
Procedures, processes or actions that
are permitted.
Preferred
Procedures, processes or actions that
are preferred.
Forbidden
Procedures, processes or actions that
are forbidden.
Tip
Indicates additional information.
Reference to documentation
A
Reference to page
Reference to graphic
1.
,
2.
,
3.
… Series of steps
Result of a step Visual inspection
1.3.4 Symbols in graphics
Symbol Meaning Symbol Meaning
1, 2, 3,... Item numbers
1.
,
2.
,
3.
… Series of steps
A, B, C, ... Views A-A, B-B, C-C, ... Sections
-
Hazardous area
.
Safe area (non-hazardous area)
1.4 Tool symbols
Symbol Meaning
A0011219
Phillips head screwdriver
1.5 Registered trademarks
Bluetooth®
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.
and any use of such marks is under license. Other trademarks and trade names are those of
their respective owners.
HART®
Registered trademark of the FieldComm Group, Austin, Texas, USA

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2 Basic safety instructions
2.1 Requirements for the personnel
The personnel for installation, commissioning, diagnostics and maintenance must fulfill the
following requirements:
‣Trained, qualified specialists: must have a relevant qualification for this specific function
and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣They must have read and understood the instructions in the manual, supplementary
documentation and certificates (depending on the application) prior to starting work
‣Follow instructions and comply with basic conditions
The operating personnel must fulfill the following requirements:
‣Must be suitably trained and authorized by the plant operator to meet the requirements of
the task
‣Follow the instructions in this manual
2.2 Intended use
The device is a universal and user-configurable temperature transmitter with one sensor input
for resistance thermometers (RTD), thermocouples (TC), resistance and voltage transmitters.
The head transmitter version of the device is intended for mounting in a terminal head (flat
face) as per DIN EN 50446. It is also possible to mount the device on a DIN rail using the
optional DIN rail clip. The device is also optionally available in a version suitable for DIN rail
mounting as per IEC 60715 (TH35).
If the device is used in a manner not specified by the manufacturer, the protection provided by
the device may be impaired.
The manufacturer is not liable for damage caused by improper or non-intended use.
2.3 Operational safety
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for the interference-free operation of the device.
Hazardous area
To eliminate a danger for persons or for the facility when the device is used in the hazardous
area (e.g. explosion protection or safety equipment):
‣Based on the technical data on the nameplate, check whether the ordered device is
permitted for the intended use in the hazardous area. The nameplate can be found on the
side of the transmitter housing.
‣Observe the specifications in the separate supplementary documentation that is an integral
part of these instructions.
Electromagnetic compatibility
The measuring system complies with the general safety requirements as per EN 61010-1, the
EMC requirements as per the IEC/EN 61326 series and the NAMUR recommendations NE 21.

Incoming acceptance and product identification L20221, L20222
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NOTICE
‣The device must only be powered by a power unit that operates using an energy-limited
electric circuit according to UL/EN/IEC 61010-1, Section 9.4 and the requirements in Table
18.
3 Incoming acceptance and product identification
3.1 Incoming acceptance
1. Unpack the temperature transmitter carefully. Is the packaging or content free from
damage?
 Damaged components must not be installed as the manufacturer can otherwise not
guarantee compliance with the original safety requirements or the material
resistance, and can therefore not be held responsible for any resulting damage.
2. Is the delivery complete or is anything missing? Check the scope of delivery against your
order.
3. Does the nameplate match the ordering information on the delivery note?
4. Are the technical documentation and all other necessary documents provided? If
applicable: are the Safety Instructions (e.g. XA) for hazardous areas provided?
3.2 Nameplate
The right device?
Compare and check the data on the nameplate of the device against the requirements of the
measuring point:
11-42V 012345678910
xx.yy.zz
Made in Germany 202x, Endress+Hauser Wetzer D-47484 Nesselwang
Ser.no.:
FW:
Input:
Dev.Rev: x
Ext. ord. cd.:
XXXXXXXXXXXXX#
12
4
3
Universal Temperature
Transmitter HART
6
5
A0051223
 1 Nameplate of the head transmitter (example)
1 Power supply, current consumption, serial number, device revision and hardware version
2 Radio approval (Bluetooth) and serial number
3 Approvals with symbols
4 Approval data and order code
5 Device name
6 Characters for tag name (TAG)

L20221, L20222 Incoming acceptance and product identification
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2
Universal Temperature
Transmitter HART
Made in Germany 202x, Endress+Hauser Wetzer D-47484 Nesselwang
3
45
6
1
7
A0051224
 2 Nameplate of DIN rail transmitter (example)
1 Device name
2 Characters for tag name (TAG)
3 Approval data
4 Power supply and current consumption, output
5 Radio approval (Bluetooth)
6 Approvals with symbols
7 Serial number, device revision, order code
3.3 Name and address of manufacturer
Name of manufacturer: Endress+Hauser Wetzer GmbH + Co. KG
Address of manufacturer: Obere Wank 1, D-87484 Nesselwang
3.4 Scope of delivery
The scope of delivery of the device comprises:
• Temperature transmitter
• Mounting material (optional for head transmitter)
• Printed copy of the Brief Operating Instructions in English
• Additional documentation for devices which are suitable for use in the hazardous area
(ATEX, FM, CSA).
3.5 Certificates and approvals
The device left the factory in a safe operating condition. The device complies with the
requirements of the standards EN 61010-1 "Safety Requirements for Electrical Equipment for

Incoming acceptance and product identification L20221, L20222
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Measurement, Control, and Laboratory Use" and with the EMC requirements as per the
IEC/EN 61326 series.
3.5.1 CE/EAC mark, Declaration of Conformity
The device meets the legal requirements of the EU/EEU guidelines. The manufacturer
confirms that the device is compliant with the relevant guidelines by applying the CE/EAC
mark.
3.5.2 HART® protocol certification
The temperature transmitter is registered by the HART® FieldComm Group. The device meets
the requirements of the HART® Communication Protocol Specifications, Revision 7 (HCF 7.6).
3.6 Storage and transport
Storage temperature
• Head transmitter: –50 to +100 °C (–58 to +212 °F)
• DIN rail device: –50 to +100 °C (–58 to +212 °F)
• Humidity: (device-specific): max. rel. humidity: 95 % as per IEC 60068-2-30
Pack the device for storage and transportation in such a way that it is reliably protected
against impact and external influences. The original packaging offers the best protection.

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4 Mounting
4.1 Mounting requirements
4.1.1 Dimensions
24.1 (0.95)
33 (1.3)
!44 (1.73)
!7 (0.28)
!5 (0.2)
B
C
A
A0036303
 3 Head transmitter version with screw terminals. Dimensions in mm (in)
A Spring travel L ≥ 5 mm (not for US - M4 securing screws)
B Mounting elements for attachable measured value display
C Interface for contacting measured value display
The same dimensions apply to the version with push-in terminals. Exception: housing
height H = 30 mm (1.18 in).

Mounting L20221, L20222
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100 (3.94)
12.5 (0.49)
H
116 (4.57)
A0039296
H The height of housing H varies depending on the terminal version: screw terminals =
114 mm (4.49 in), push-in terminals = 111.5 mm (4.39 in)
4.1.2 Mounting location
• Head transmitter:
• In the terminal head, flat face, as per DIN EN 50446, direct mounting on insert with cable
entry (middle hole 7 mm)
• In the field housing, separated from the process
• With DIN rail clip on DIN rail as per IEC 60715, TH35
• DIN rail transmitter:
In DIN rail housing on DIN rail as per IEC 60715, TH35
NOTICE
When using a DIN rail transmitter with a thermocouple/mV measurement, increased
measurement deviations may occur depending on the installation situation and ambient
conditions.
‣If the DIN rail transmitter is mounted on the DIN rail without any adjacent devices, this
may result in deviations of up to ± 1.34 °C. If the DIN rail transmitter is mounted in series
between other DIN rail devices (reference operating conditions: 24 V, 12 mA), deviations
of up to + 2.94 °C may occur.

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4.1.3 Important ambient conditions
• Ambient temperature: –40 to +85 °C (–40 to 185 °F).
• Head transmitter in accordance with climate class C1, DIN rail transmitter in accordance
with B2 as per EN 60654-1
• Condensation as per IEC 60068-2-33 permitted for head transmitter, not permitted for DIN
rail transmitter
• Max. rel. humidity: 95% as per IEC 60068-2-30
• Degree of protection:
• Head transmitter with screw terminals: IP 20, with push-in terminals: IP 30. When the
device is installed, the degree of protection depends on the terminal head or field housing
used.
• DIN rail device: IP 20
4.2 Mounting the device
A Phillips head screwdriver is required to mount the head transmitter:
• Maximum torque for securing screws = 1 Nm (¾ foot-pound), screwdriver: Pozidriv Z2
• Maximum torque for screw terminals = 0.35 Nm (¼ foot-pound), screwdriver: Pozidriv Z1

Mounting L20221, L20222
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4.2.1 Mounting the head transmitter
1
2
3
4
5
6
7
9
8
1 2 3 4 5 1234
120 mm
(4.72 in)
120 mm
(4.72 in)
Item A Item B
Item C
A0039675-EN
 4 Head transmitter mounting (three versions)
Procedure for mounting in a terminal head, Fig. A:
1. Open the terminal head cover (8) on the terminal head.
2. Guide the connection wires (4) of the insert (3) through the center hole in the head
transmitter (5).
3. Fit the mounting springs (6) on the mounting screws (7).
4. Guide the mounting screws (7) through the side boreholes of the head transmitter and
the insert (3). Then fix both mounting screws with the snap rings (2).
5. Then tighten the head transmitter (5) along with the insert (3) in the terminal head.
6. After wiring →  15, close the terminal head cover (8) tightly again.

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120 mm
(4.72 in)
140 mm
(5.51 in)
21 mm
(0.83 in)
!6.5 mm
(0.25 in)
A0024604
 5 Dimensions of angle bracket for wall mount (complete wall mounting set available as accessory)
Procedure for mounting in a field housing, Fig. B:
1. Open the cover (1) of the field housing (4).
2. Guide the mounting screws (2) through the lateral bores in the head transmitter (3).
3. Screw the head transmitter to the field housing.
4. After wiring →  15, close the field housing cover (1) again.
Procedure for mounting on a DIN rail, Fig. C:
1. Press the DIN rail clip (4) onto the DIN rail (5) until it engages with a click.
2. Fit the mounting springs on the mounting screws (1) and guide the screws through the
side boreholes of the head transmitter (2). Then fix both mounting screws with the snap
rings (3).
3. Screw the head transmitter (2) onto the DIN rail clip (4).

Mounting L20221, L20222
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Mounting typical of North America
12 3 456
A0008520
 6 Head transmitter mounting
Thermometer design with thermocouples or RTD sensors and head transmitter:
1. Fit the thermowell (1) on the process pipe or the container wall. Secure the thermowell
according to the instructions before the process pressure is applied.
2. Fit the necessary neck tube nipples and adapter (3) on the thermowell.
3. Make sure sealing rings are installed if such rings are needed for harsh environmental
conditions or special regulations.
4. Guide the mounting screws (6) through the lateral bores of the head transmitter (5).
5. Position the head transmitter (5) in the terminal head (4) in such a way that the bus
cable (terminals 1 and 2) point to the cable entry.
6. Using a screwdriver, screw down the head transmitter (5) in the terminal head (4).
7. Guide the connection wires of the insert (3) through the lower cable entry of the
terminal head (4) and through the middle hole in the head transmitter (5). Wire the
connection wires up to the transmitter →  17.
8. Screw the terminal head (4), with the integrated and wired head transmitter, onto the
ready-mounted nipple and adapter (3).
NOTICE
The terminal head cover must be secured properly to meet the requirements for
explosion protection.
‣After wiring, securely screw the terminal head cover back on.
4.2.2 Mounting the DIN rail transmitter
NOTICE
Wrong orientation
Measurement deviates from the maximum accuracy rating when a thermocouple is connected
and the internal reference junction is used.
‣Mount the device vertically and ensure it is oriented correctly!

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1.
2.
3.
A0039678
 7 Mounting the DIN rail transmitter
1. Position the top DIN rail groove at the top end of the DIN rail.
2. Slide the bottom of the device over the bottom end of the DIN rail until you can hear the
lower DIN rail clip click into place on the DIN rail.
3. Pull gently on the device to check if it is correctly mounted on the DIN rail.
If it doesn't move, the DIN rail transmitter is correctly mounted.
4.3 Post-installation check
After installing the device, run the following final checks:
Device condition and specifications Notes
Is the device undamaged (visual inspection)? -
Do the ambient conditions match the device specification (e.g. ambient temperature,
measuring range, etc.)?
→  11
5 Electrical connection
LCAUTION
‣Switch off the power supply before installing or connecting the device. Failure to observe
this may result in the destruction of parts of the electronics.
‣Do not occupy the display connection. An incorrect connection can destroy the electronics.
NOTICE
Do not overtighten the screw terminals, as this could damage the transmitter.
‣Maximum tightening torque = 1 Nm (³⁄₄ lbf ft).

Electrical connection L20221, L20222
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5.1 Connecting requirements
A Phillips head screwdriver is required to wire the head transmitter with screw terminals. Use
a flat blade screwdriver for the DIN rail housing version with screw terminals. The push-in
terminal version can be wired without any tools.
Proceed as follows to wire a head transmitter mounted in the terminal head or field housing:
1. Open the cable gland and the housing cover on the terminal head or the field housing.
2. Feed the cables through the opening in the cable gland.
3. Connect the cables as shown in →  17. If the head transmitter is fitted with push-in
terminals, pay particular attention to the information in the "Connecting to push-in
terminals" section. →  18
4. Tighten the cable gland again and close the housing cover.
In order to avoid connection errors always follow the instructions in the post-connection check
section before commissioning!

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5.2 Quick wiring guide
6
5
4
3
1+
2-
6
5
4
3
C
D
B
A
RD
RD
WH
WH
A0047635
 8 Assignment of terminal connections for head transmitter
A Sensor input, RTD and Ω, 4-, 3- and 2-wire
B Sensor input, TC and mV
C Bus terminator and power supply
D Display connection and CDI interface
-
+
5
6
4
3
1
2
12
4
3
56
A
WH
WH
RD
RD
B
C
A0047638
 9 Assignment of terminal connections for DIN rail transmitter
A Sensor input, TC and mV
B Sensor input, RTD and Ω, 4-, 3- and 2-wire
C Power supply 4 to 20 mA

Electrical connection L20221, L20222
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A minimum load of 250 Ω is required in the signal circuit in order to operate the HART®
transmitter via the HART® protocol (terminals 1 and 2).
In the case of a thermocouple (TC) measurement, a 2-wire RTD can be connected to measure
the reference junction temperature. This is connected to terminals 4 and 6.
NOTICE
‣ ESD – Electrostatic discharge. Protect the terminals from electrostatic discharge. Failure
to observe this may result in the destruction or malfunction of parts of the electronics.
5.3 Connecting the sensor cables
5.3.1 Connecting to push-in terminals
2.
3.
4.
5.
1.
2.
3.
AB
C
A0039468
 10 Push-in terminal connection, using the example of a head transmitter
Fig. A, solid wire:
1. Strip wire end. Minimum stripping length 10 mm (0.39 in).
2. Insert the wire end into the terminal.
3. Pull the wire gently to ensure it is connected correctly. Repeat starting from step 1 if
necessary.
Fig. B, fine-strand wire without ferrule:
1. Strip wire end. Minimum stripping length 10 mm (0.39 in).
2. Press down on the lever opener.

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3. Insert the wire end into the terminal.
4. Release lever opener.
5. Pull the wire gently to ensure it is connected correctly. Repeat starting from step 1 if
necessary.
Fig. C, releasing the connection:
1. Press down on the lever opener.
2. Remove the wire from the terminal.
3. Release lever opener.
5.4 Connecting the transmitter
Cable specification
• A normal device cable suffices if only the analog signal is used.
• For the DIN rail version, a shielded cable must be used as of a sensor cable length of
30 m (98.4 ft). The use of shielded sensor cables is generally recommended.
Also observe the general procedure on →  16.

Electrical connection L20221, L20222
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1 2 3
4
2- 1+
2-
1+ 2- 1+
5
6
7
4
5
7
A0039698
 11 Connecting the signal cables and power supply
1 Head transmitter installed in field housing
2 Head transmitter installed in terminal head
3 DIN rail transmitter mounted on DIN rail
4 Terminals for power supply
5 Internal ground connection
6 External ground connection
7 Shielded signal cable
• The terminals for the power supply (1+ and 2-) are protected against reverse polarity.
• Conductor cross-section:
• Max. 2.5 mm2 for screw terminals
• Max. 1.5 mm2 for push-in terminals. Stripping length of wire at least
10 mm (0.39 in).