Pepperl+Fuchs LCR20 Manual

ISO9001
LCR20 HART
Level Radar
Technical Information

With regard to the supply of products, the current issue of the following document is applicable:
The General Terms of Delivery for Products and Services of the Electrical Industry, published by the Central
Association of the Electrical Industry (Zentralverband Elektrotechnik und Elektroindustrie (ZVEI) e.V.) in its most
recent version as well as the supplementary clause: "Expanded reservation of proprietorship"
Worldwide
Pepperl+Fuchs Group
Lilienthalstr. 200
68307 Mannheim
Germany
Phone: [phone] - 0
E-mail: [e-mail]
North American Headquarters
Pepperl+Fuchs Inc.
1600 Enterprise Parkway
Twinsburg, Ohio 44087
USA
Phone: [phone]
E-mail: [email protected]erl-fuchs.com
Asia Headquarters
Pepperl+Fuchs Pte. Ltd.
P+F Building
18 Ayer Rajah Crescent
Singapore 139942
Phone: [phone]
E-mail: [email protected]m
https://www.pepperl-fuchs.com

Level Radar LCR20
Contents
2021-06
3
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Content of this Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Terms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Document Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Product Life Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Procurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.6 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7 Retirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Measuring principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Measured Variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Measuring Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Operating Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4 Transmission Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 Digital Output HART® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3 Signal on Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.4 Linearization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Protocol-Specific Data, HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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Level Radar LCR20
Contents
8 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.1 Cable Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.2 Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.3 Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.4 Starting Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.5 Power Supply Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.6 Connecting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.7 Cable Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.8 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.1 Reference Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.2 Maximum Measured Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.3 Measured Value Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.4 Response Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.5 Influence of Ambient Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10.1 Installation Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
11 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.1 Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.2 Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.3 Climate Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.4 Operating Altitude according to IEC 61010-1 Ed.3 . . . . . . . . . . . . . . . . 30
11.5 Degree of Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.6 Vibration Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.7 Electromagnetic Compatibility (EMC). . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
12.1 Process Temperature, Process Pressure . . . . . . . . . . . . . . . . . . . . . . . . 31
12.2 Dielectric Constant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Level Radar LCR20
Contents
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13 Mechanical Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
13.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
13.2 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13.4 Connecting Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
14 Operability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
14.1 Operating Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
14.2 Operation via Bluetooth® Wireless Technology . . . . . . . . . . . . . . . . . . 38
14.3 Operation via HART Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
15 Certificates and Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15.1 CE Mark. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15.2 RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15.3 RCM-Tick Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15.4 Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
15.5 Explosion-Protected Smartphones and Tablets . . . . . . . . . . . . . . . . . . 40
15.6 Pressure Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
15.7 EN 302729-1/2 Radio Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
15.8 FCC/Industry Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
15.9 Japanese Radio Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
15.10 Other Standards and Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
16 Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
17 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
17.1 Enclosed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
17.2 Further Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
18 Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
18.1 Technical Information (TI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
18.2 Manual (BA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
18.3 Brief Instructions (KA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
18.4 Instruction Manual (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
19 Registered Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

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Level Radar LCR20
Contents

Level Radar LCR20
Introduction
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1 Introduction
1.1 Content of this Document
This document contains information that you need in order to use your product throughout
the applicable stages of the product life cycle. These can include the following:
•Product identification
•Delivery, transport, and storage
•Mounting and installation
•Commissioning and operation
•Maintenance and repair
•Troubleshooting
•Dismounting
•Disposal
The documentation consists of the following parts:
•Datasheet – product overview
The datasheet contains the essential technical data for product selection.
•Technical information (TI), present document – planning aid
The document contains all the technical data on the device and provides an overview
of the accessories and other products that can be ordered for the device.
•Manual (BA) – complete information
The manual contains all information from incoming acceptance to disposal.
•Brief instructions (KA) – guide that takes you quickly to the 1st measured value
The brief instructions contain all the essential information from incoming acceptance
to initial commissioning.
•Instruction manual (SI) – safety-relevant document
Depending on the approval, the required instruction manuals are supplied
with the device.
Additionally, the following parts may belong to the documentation, if applicable:
•EU-type examination certificate
•EU declaration of conformity
•Attestation of conformity
•Certificates
•Control drawings
•Additional documents
Note
This document does not substitute the instruction manual.
Note
For full information on the product, refer to the instruction manual and further documentation
on the Internet at www.pepperl-fuchs.com.

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Level Radar LCR20
Introduction
1.2 Safety Information
Target Group, Personnel
Responsibility for planning, assembly, commissioning, operation, maintenance,
and dismounting lies with the plant operator.
Only appropriately trained and qualified personnel may carry out mounting, installation,
commissioning, operation, maintenance, and dismounting of the product. The personnel must
have read and understood the instruction manual and the further documentation.
Prior to using the product make yourself familiar with it. Read the document carefully.
1.3 Symbols Used
This document contains symbols for the identification of warning messages and
of informative messages.
Warning Messages
You will find warning messages, whenever dangers may arise from your actions.
It is mandatory that you observe these warning messages for your personal safety and in order
to avoid property damage.
Depending on the risk level, the warning messages are displayed in descending order
as follows:
Informative Symbols
Action
This symbol indicates a paragraph with instructions. You are prompted to perform an action
or a sequence of actions.
Danger!
This symbol indicates an imminent danger.
Non-observance will result in personal injury or death.
Warning!
This symbol indicates a possible fault or danger.
Non-observance may cause personal injury or serious property damage.
Caution!
This symbol indicates a possible fault.
Non-observance could interrupt the device and any connected systems and plants,
or result in their complete failure.
Note
This symbol brings important information to your attention.

Level Radar LCR20
Introduction
2021-06
9
Symbols for Certain Types of Information and Graphics
Permitted
Procedures, processes or actions that are permitted.
Forbidden
Procedures, processes or actions that are forbidden.
1, 2, 3 ... Item numbers
A, B, C, ... Views

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Level Radar LCR20
Terms and Abbreviations
2 Terms and Abbreviations
2.1 Document Types
BA
Document type Manual
KA
Document type Brief Instructions
TI
Document type Technical Information
SI
Document type Instruction manual
2.2 Abbreviations
PN
Nominal pressure
MWP
MWP (Maximum working pressure/max. process pressure)
The MWP can also be found on the nameplate.
ToF
Time of Flight
PACTwareTM
Manufacturer independent operating software for field devices
Frame application (FDT – Field Device Tool) for running DTMs
DTM
Device Type Manager – Device driver component for a device in an FDT environment
r
DK value – relative dielectric constant
Operating tool
The term operating tool is used in place of the following operating software:
•PACTware, for operation via HART communication and PC
•P+F Level (app), for operation using an Android or iOS smartphone or tablet
BD
Blocking Distance; no signals are analyzed within the BD.
PLC
Programmable logic controller (PLC)

Level Radar LCR20
Product Life Cycle
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3 Product Life Cycle
3.1 Engineering
•Proven radar measuring technology
•Level measurement and open channel flow measurement for Ex and non-Ex areas
•Flooding detection
•Wide range of installation possibilities and accessories
•Highest degree of ingress protection
•2D/3D drawings
•Spec sheet producer
•Applicator selection tool for selecting the perfect measurement solution
3.2 Procurement
•Best price-performance-ratio radar
•Global availability
•Order code includes variety of mounting accessories
3.3 Installation
•Rear and front thread for flexible installation
•Slip-on flange for nozzle installation
•Complete measuring point: including mounting accessory and flooding protection tube
3.4 Commissioning
•Quick and easy setup with the P+F Level app or PACTware
•No additional tools or adapters required
•Local languages (up to 15)
3.5 Operation
•Continuous self-monitoring
•Diagnostics information according to NAMUR NE107 with remedial measures in the form
of plain text messages
•Signal curve via P+F Level (app) and PACTware
•Encrypted single point-to-point data transmission (tested by Fraunhofer Institute) and
password protected communication via Bluetooth® wireless technology
3.6 Maintenance
•No maintenance required
•Technical experts on-call around the world
3.7 Retirement
•Environmentally responsible recycling concepts
•RoHS compliance (restriction of certain hazardous substances), lead-free soldering
of electronic components
Note
Device not compatible with transmitters and sensors that use ultrasonic measurement
technology.

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Level Radar LCR20
Measuring principle
4 Measuring principle
The device is a "downward-looking" measuring system, which functions according to the time-
offlight (ToF) method. It measures the distance from the reference point R to the product
surface. Radar pulses are emitted by an antenna, reflected off the product surface and
received again by the radar system.
Figure 4.1 Setup parameters of the device
4.1 Input
The reflected radar pulses are received by the antenna and transmitted to the electronics.
A microprocessor evaluates the signals and identifies the level echo caused by the reflection
of the radar pulses at the product surface. This clear signal detection system benefits
from over 30 years' experience with time-of-flight procedures.
The distance D to the product surface is proportional to the time of flight t of the pulse:
D = c x t/2,
where c is the speed of light.
Based on the known empty distance E, the level L is calculated:
L = E – D
4.2 Output
The device is calibrated by entering the empty distance E (= zero point) and the full distance
F(= span).
•Current output: 4 to 20 mA
•Digital output (HART, P+F Level): 0 to 15 m (0 to 49 foot) or 0 to 20 m (0 to 66 foot)
depending on antenna version
EEmpty calibration (= zero)
FFull calibration (= span)
DMeasured distance
LLevel (L = E - D)
QFlow rate at measuring weirs or channels (calculated from the level using linearization)
RReference point
D
Q
R100%
0%
D
L
FE

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Input
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5 Input
5.1 Measured Variable
The measured variable is the distance between the reference point and the product surface.
The level is calculated based on E, the empty distance entered.
5.2 Measuring Range
Maximum measuring range
•Device with 40 mm (1.5 inch) antenna: 15 m (49 foot)
•Device with 80 mm (3 inch) antenna: 20 m (66 foot)
Installation requirements
•Recommended tank height > 1.5 m (5 foot) for media with low εr value
•Open channel minimum width 0.5 m (1.6 foot)
•Calm surfaces
•No agitators
•No buildup
•Relative dielectric constant εr > 4
Contact Pepperl+Fuchs for lower εr values
Usable measuring range
The usable measuring range depends on the antenna size, the medium's reflective properties,
the installation position and any possible interference reflections.
Media groups
•εr = 4 to 10
e. g. concentrated acid, organic solvents, ester, aniline, alcohol, acetone.
•εr > 10
e. g. conductive liquids, aqueous solutions, diluted acids and bases
Reduction of the maximum possible measuring range by:
•Media with bad reflective properties (= low εr value)
•Formation of buildup, particularly of moist products
•Strong condensation
•Foam generation
•Freezing of sensor
5.3 Operating Frequency
K-band (~ 26 GHz)
5.4 Transmission Power
Mean power density in the direction of the beam
•At a distance of 1 m (3.3 foot): < 12 nW/cm2
•At a distance of 5 m (16 foot): < 0.4 nW/cm2

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Level Radar LCR20
Output
6 Output
6.1 Output Signal
Output signal 4 to 20 mA
An 4 to 20 mA interface is used for measured value output and to power to the device.
6.2 Digital Output HART®
•Signal encoding; FSK ±0.5 mA over current signal
•Data transmission rate; 1200 Bit/s
Bluetooth® Wireless Technology (available as an optional extra)
The device has a Bluetooth® wireless technology interface and can be operated
and configured via this interface using the P+F Level app.
•The range under reference conditions is 25 m (82 foot).
•Incorrect operation by unauthorized persons is prevented by means of encrypted
communication and password encryption.
•The Bluetooth® wireless technology interface can be deactivated.
6.3 Signal on Alarm
Depending on the interface, failure information is displayed as follows:
•Current output
Alarm current: 22.5 mA (in accordance with NAMUR recommendation NE 43)
•Operating tool via digital communication (HART) or P+F Level (app)
•Status signal (as per NAMUR Recommendation NE 107)
•Plain text display with remedial action
6.4 Linearization
The linearization function of the device allows the conversion of the measured value into any
unit of length, weight, flow or volume. When operating via PACTware and linearization tables
for calculating the volume are preprogrammed in the vessels.
Pre-programmed linearization curves
•Horizontal cylindrical tank
•Sphere
•Tank with pyramid bottom
•Tank with conical bottom
•Tank with flat bottom
Other linearization tables of up to 32 value pairs can be entered manually.

Level Radar LCR20
Protocol-Specific Data, HART
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7 Protocol-Specific Data, HART
Manufacturer ID
0x005D
Device type ID
0x5DD3
HART specification
7.0
Device description files (DTM)
Information and files under:
•www.pepperl-fuchs.com
•www.hartcomm.org
HART load
Min. 250 
HART device variables
Assignment of HART device variables is fixed and cannot be changed.
•Measured values for PV (primary variable)
Level linearized
•Advanced diag. measured values for SV (secondary variable)
Distance
•Advanced diag. measured values for TV (tertiary variable)
Relative echo amplitude
•Advanced diag. measured values for QV (quarternary variable)
Temperature
Supported functions
Additional transmitter status
Multidrop current
4 mA
Time for connection setup
< 1 s

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Level Radar LCR20
Electrical Connection
8 Electrical Connection
8.1 Cable Assignment
Figure 8.1 Cable assignment
8.2 Supply Voltage
10.5 to 30 V DC
An external power supply is necessary.
Figure 8.2 Maximum load R, depending on supply voltage Uo of power supply unit
1Plus, brown wire
2Minus, blue wire
-
+
12
R[Ω]
U0[V]
10
10.5 21.75
20 30
0
500

Level Radar LCR20
Electrical Connection
2021-06
17
Battery operation
The sensor's Bluetooth® wireless technology communication can be disabled to increase
the operating life of the battery.
Potential equalization
No special measures for potential equalization are required.
8.3 Power Consumption
Maximum input power: 675 mW
Current consumption
•Maximum input current: <25 mA
•Maximum start-up current: 3.6 mA
8.4 Starting Time
First stable measured value after 20 s (with supply voltage = 24 V DC)
8.5 Power Supply Failure
The configuration remains stored in the sensor.
Note
Various power supply units can be ordered as an accessory from Pepperl+Fuchs.

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Level Radar LCR20
Electrical Connection
8.6 Connecting the Device
4 to 20 mA HART block diagram
Connection of the device with HART communication, power source and 4 to 20 mA display
Figure 8.3 Block diagram of HART connection
8.7 Cable Specification
Unshielded cable, wire cross-section 0.75 mm2
•Resistant to UV and weather conditions as per ISO 4892-2
•Flame resistance according to IEC 60332-1-2
According to IEC/EN 60079-11 section 10.9, the cable is designed for a tensile strength
of 30 N (6.74 lbf) (over a period of 1 h).
The device is supplied with 5 m (16 foot) cable length as standard.
Cable lengths 10 m (33 foot) and 20 m (66 foot) are optionally available.
Lengths can be selected by the user up to an overall length of 300 m (980 foot)
and are available by the meter (order option 8) or foot (order option A).
8.8 Overvoltage Protection
The device is equipped with integrated overvoltage protection.
1Device with HART communication
2HART resistor
3Power supply
2
3
Y+
-
+
-
I
1
mA
Note
The HART communication resistor of 250  in the signal line is always necessary in the case
of a low-impedance power supply.
The voltage drop to be taken into account is:
Max. 6 V for 250  communication resistor

Level Radar LCR20
Performance Characteristics
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9 Performance Characteristics
9.1 Reference Operating Conditions
•Temperature = +24 °C (+75 °F) ±5 °C (±9 °F)
•Pressure = 960 mbar abs. (14 psia) ±100 mbar (±1.45 psi)
•Humidity = 60 % ±15 %
•Reflector: metal plate with diameter ≥ 1 m (40 inch)
•No major interference reflections inside the signal beam
9.2 Maximum Measured Error
Typical data under reference operating conditions: DIN EN 61298-2, percentage values in
relation to the span.
Output, digital
(HART, P+F Level (app))
•Sum of non-linearity, non-repeatability and hysteresis: ±2 mm (±0.08 inch)
•Offset/zero point: ±4 mm (±0.16 inch)
Output, analog
Only relevant for 4 to 20 mA current output; add error of the analog value to the digital value
•Sum of non-linearity, non-repeatability and hysteresis: ±0.02 %
•Offset/zero point: ±0.03 %
Differing values in near-range applications
Figure 9.1 Maximum measured error in near-range applications; values for standard version
Maximum measured error
RReference point of the distance measurement
DDistance from reference point of antenna
0
0.5 (1.67) D[m (ft)]
∆[mm (in)]
2 (0.08)
10 (0.39)
-20 (-0.79)
20 (0.79)
-2 (-0.08)
-10 (-0.39)
RR
0.1 (0.33)
R

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Level Radar LCR20
Performance Characteristics
9.3 Measured Value Resolution
Dead band as per EN61298-2:
• Digital: 1 mm (0.04 inch)
• Analog: 4 μA
9.4 Response Time
The response time can be configured. The following step response times apply
(in accordance with DIN EN 61298-2) when damping is switched off:
Tank height
< 20 m (66 foot)
Sampling rate
1 s-1
Response time
< 3 s
In accordance with DIN EN 61298-2, the step response time is the time following an abrupt
change in the input signal up until the changed output signal has adopted 90 % of the
steadystate value for the first time.
9.5 Influence of Ambient Temperature
The measurements are carried out in accordance with EN 61298-3
•Digital (HART, Bluetooth® wireless technology):
Standard version: average TC = ±3 mm (±0.12 inch)/10 K
•Analog (current output):
•Zero point (4 mA): average TC = 0.02 %/10 K
•Span (20 mA): average TC = 0.05 %/10 K