Pepperl+Fuchs LGC2 Manual

ISO9001
Level Probe LGC2
Hydrostatic Level
Measurement
PROCESS AUTOMATION
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".
Level Probe LGC2
Application
The device is a pressure sensor for hydrostatic level measurement.
Pepperl+Fuchs offers three different versions of the device:
• Device with a stainless steel housing, external diameter of 22 mm (0.87 inch):
This version is excellently suited to drinking water applications and for use in bore holes and wells with
small diameters
• Device with a stainless steel housing, external diameter of 42 mm (1.65 inch):
Heavy-duty version and easy to clean thanks to flush-mounted process isolating diaphragm, ideally
suited to wastewater and wastewater treatment plants
• Device with plastic insulation, external diameter of 29 mm (1.14 inch):
Robust version for use in salt water and excellently suited to applications on ships (e. g. ballast water
tanks)
Your benefits
• High resistance to overload
• High-precision, robust ceramic measuring cell with long-term stability
• Climate proofed sensor thanks to completely potted electronics and 2-filter pressure compensation
system
• Simultaneous measurement of level and temperature with optionally integrated Pt100 resistance
thermometer
• Accuracy
• Standard reference accuracy ±0.2 %
• Plantinum version ±0.1 %
• Automatic density compensation to increase accuracy
• Usage in drinking water: KTW, NSF, ACS
• Approvals: ATEX, FM, CSA
• Extensive range of accessories provides complete measuring point solutions

Level Probe LGC2
Content
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1 Important Document Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Terms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Turn down calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Function and System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Device Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Measuring Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Measuring System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5 System Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3 Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 Measured Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2 Measuring Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Signal Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Maximum Load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 Connecting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5 Terminals in the Terminal Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.6 Probe Connection (Extension Cable) . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.7 Cable Resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.8 Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.9 Residual Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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Level Probe LGC2
Content
6 Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Reference Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Reference Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.4 Long-Term Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.5 Influence of Medium Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.6 Warm-up Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.7 Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1 Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Additional Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3 Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.4 Technical Data for Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.5 Cable Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.6 Cable Shortening Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8 Ambient Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 Ambient Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Degree of Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.4 Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.5 Surge Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9 Process Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.1 Medium Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9.2 Medium Temperature Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10 Mechanical Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1 Dimensions of the Level Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.2 Dimensions of the Suspension Clamp . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.3 Dimensions of Cable Mounting Screw . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.4 Dimensions of Terminal Box IP66, IP67 with Filter. . . . . . . . . . . . . . . 36

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10.5 Dimensions of the HUT Temperature Head Transmitter . . . . . . . . . . 37
10.6 Terminal Box with Integrated HUT Temperature Head Transmitter . 37
10.7 Additional Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.8 Testing Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.10 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
12 Certificates and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.1 CE Mark. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.2 Approvals for hazardous area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.3 Potable Water Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.4 Other Standards and Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.5 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
12.6 Calibration, Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
12.7 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
13 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
13.1 Product Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
13.2 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
13.3 Configuration Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
14 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
15 Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
15.1 Technical Information (TI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
15.2 Brief Instructions (KA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
15.3 Manual (BA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
15.4 Instruction Manuals (SI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
15.5 Potable Water Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
16 Registered Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

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Level Probe LGC2
Important Document Information
1 Important Document Information
1.1 Document Conventions
1.1.1 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.

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Important Document Information
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1.1.2 Electrical symbols
1.1.3 Symbols for certain types of information
Symbol Meaning
Direct current
A terminal to which DC voltage is applied or through which direct
current flows.
Alternating current
A terminal to which alternating voltage is applied or through which
alternating current flows.
Direct current and alternating current
• A terminal to which alternating voltage or DC voltage is applied.
• A terminal through which alternating current or direct current
flows.
Ground connection
A grounded terminal which, as far as the operator is concerned, is
grounded via a grounding system.
Protective ground connection
A terminal which must be connected to ground prior to establishing
any other connections.
Equipotential connection
A connection that has to be connected to the plant grounding
system: This may be a potential equalization line or a star grounding
system depending on national or company codes of practice.
Table 1.1
)
*
Symbol Meaning
Allowed
Indicates procedures, processes or actions that are allowed.
Preferred
Indicates procedures, processes or actions that are preferred.
Forbidden
Indicates procedures, processes or actions that are forbidden.
1., 2., 3. ... Series of steps
Result of a sequence of actions
Visual check
Table 1.2

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Level Probe LGC2
Important Document Information
1.1.4 Symbols in graphics
1.2 Terms and Abbreviations
Figure 1.1
Symbol Meaning
1, 2, 3 ... Item numbers
Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
Hazardous area
Indicates a hazardous area.
Safe area (non-hazardous area)
Indicates a non-hazardous location.
Table 1.3
,… ,1. 2. 3.
-
.
URL OPLMWP
LRL
0
p
LRV URV
1
2
3
4

Level Probe LGC2
Important Document Information
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Position Terms/abbreviations Explanation
1OPL The OPL (over pressure limit = sensor overload limit) for
the measuring device depends on the lowest-rated
element, with regard to pressure, of the selected
components, i. e. the process connection has to be taken
into consideration in addition to the measuring cell. Also
observe pressure-temperature dependency. For the
relevant standards and additional notes, see the
"Pressure specifications" section.
The OPL may only be applied for a limited period of time.
2MWP The MWP (maximum working pressure) for the sensors
depends on the lowest-rated element, with regard to
pressure, of the selected components, i. e. the process
connection has to be taken into consideration in addition
to the measuring cell. Also observe pressure-
temperature dependency. For the relevant standards
and additional notes, see the "Pressure specifications"
section.
The MWP may be applied at the device for an unlimited
period. The MWP can also be found on the nameplate.
3Maximum sensor
measuring range
Span between LRL and URL
This sensor measuring range is equivalent to the
maximum calibratable/adjustable span.
4Calibrated/adjusted
span
Span between LRV and URV
Factory setting: 0 to URL
Other calibrated spans can be ordered as customized
spans.
p – Pressure
–LRL Lower range limit
–URL Upper range limit
–LRV Lower range value
–URV Upper range value
–TD (Turn down) Turn down: Example see the following section.
–PE Polyethylene
–FEP Fluorinated ethylene propylene
Table 1.4

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Level Probe LGC2
Important Document Information
1.3 Turn down calculation
Figure 1.2
Example
• Sensor: 10 bar (150 psi)
• Upper range value (URL) = 10 bar (150 psi)
• Calibrated/adjusted span: 0 to 5 bar (0 to 75 psi)
• Lower range value (LRV) = 0 bar (0 psi)
• Upper range value (URV) = 5 bar (75 psi)
TD = URL/(URV –LRV)
TD = 10 bar (150 psi)/(5 bar (75 psi) –0bar(0psi))=2
In this example, the TD is 2:1. This span is based on the zero point.
1Calibrated/adjusted span
2Zero point-based span (4 to 20 mA analog: customer-specific span can only be set at the
factory when ordered)
3Upper range value
LRV URLURV LRL
1 = 2
3

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Function and System Design
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2 Function and System Design
2.1 Device Versions
Caution!
Gas loss when using the device in biogas plants
The device is not suitable for use in biogas plants since the gases can diffuse through the
elastomers (seals, probe connection).
Use the devices LHCR-51, LHCS-51 for applications involving biogas.
Outer diameter 22 mm (0.87 inch) 42 mm (1.65 inch) max. 29 mm (1.14 inch)
Field of application Hydrostatic level
measurement in deep
wells e. g. drinking water
Hydrostatic level
measurement in
wastewater
Hydrostatic level
measurement in saltwater
Process connection
(extension cable)
• Suspension clamp
• Cable mounting screw with G1-1/2A thread or NPT1-1/2 thread
Probe connection PE, FEP
Seals •FKMViton
•EPDM
1
FKM Viton •FKMViton
•EPDM
1
Measuring ranges • Relative pressure: 0 to 0.1 bar (0 to 1.5 psi) to
0 to 20 bar (0 to 300 psi)
• Absolute pressure: 0 to 2 bar (0 to 30 psi) to
0 to 20 bar (0 to 300 psi)
• Relative pressure:
0 to 0.1 bar (0 to 1.5 psi)
to 0 to 4 bar (0 to 60 psi)
• Absolute pressure:
0 to 2 bar (0 to 30 psi) to
0 to 4 bar (0 to 60 psi)
• Customer-specific measuring ranges; factory-calibrated.
• The following output units can be configured: %, mbar, bar, kPa, MPa, mm H2O,
m H2O, inch H2O, foot H2O, psi and numerous level units.
Overload to 40 bar (600 psi) to 25 bar (375 psi)
Process temperature
range
-10 to +70 °C (+14 to +158 °F) 0 to +50 °C (+32 to +122 °F)
Reference accuracy •±0.2 % of the set span
• optional: ±0.1 % of the set span (Platinum version)
Supply voltage 10.5 to 35 V DC, Ex: 10.5 to 30 V DC
Output 4 to 20 mA Analog

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Level Probe LGC2
Function and System Design
Options Drinking water approval –
• Wide range of approvals, including ATEX, FM, CSA
• Numerous accessories
• Integrated Pt100 resistance thermometer and HUT temperature head transmitter
(4 to 20 mA)
Specialties • High-precision, robust ceramic measuring cell with long-term stability
• Automatic density compensation
• Customer-specific cable marking
1
Recommended for drinking water applications, not suitable for use in hazardous areas.
Outer diameter 22 mm (0.87 inch) 42 mm (1.65 inch) max. 29 mm (1.14 inch)

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2.2 Measuring Principle
The ceramic measuring cell is a dry measuring cell i. e. the pressure acts directly on the robust,
ceramic process isolating diaphragm of the device. Changes in air pressure are guided via a
pressure compensation tube through the extension cable to the rear of the ceramic process
isolating diaphragm and are compensated for. A pressure-dependent change in capacitance,
caused by the movement of the process isolating diaphragm, is measured at the electrodes of
the ceramic carrier. The electronics unit then converts this to a signal that is proportional to the
pressure and linear to the level.
Figure 2.1
Temperature measurement with optional Pt100 resistance
thermometer
1
For simultaneous measurement of level and temperature, Pepperl+Fuchs offers the device
with an optional 4-wire Pt100 resistance thermometer. The Pt100 ressistance thermometer is
categorized as Accuracy Class B as per DIN/EN 60751.
1Ceramic measuring cell
2Pressure compensation tube
hHeight level
pTotal pressure = atmospheric pressure + hydrostatic pressure
rDensity of the medium
gAcceleration due to gravity
P
hydr.
Hydrostatic pressure
P
atm
Atmospheric pressure
P
sens
Pressure displayed on the sensor
1
Not for use in hazardous areas.
.
.
2
1
ρ x g
h ~ p
h = p
p
hydr
p
atm
p
atm
p = p +
atm hydr.
p
h
p = p + p
atm hydr
p
atm
Rel.:p = (p + p ) -
sens atm hydr.
Abs.:p = (p +
sens atm hydr.
p)
p
atm

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Level Probe LGC2
Function and System Design
Temperature measurement with optional Pt100 resistance thermometer
and HUT temperature head transmitter
1
To convert the temperature signal to an analog, scalable 4 to 20 mA output signal,
Pepperl+Fuchs also offers the HUT temperature head transmitter. Ordering information:
product structure, feature "Accessories", option "XP".
2.3 Measuring System
Application Examples
As standard, the complete measuring system consists of a level probe and a transmitter power
supply unit with a supply voltage of 10.5 to 30 V DC (hazardous areas) or 10.5 to 35 V DC
(non-hazardous areas).
Possible measuring point solutions with a signal converter and evaluation device:
Figure 2.2
1
Not for use in hazardous areas.
1Level probe LGC
24to20mA
3 and 4 Surge protection device, e. g. for DIN mounting rail mounting, selection in accordance
with supply voltage, not for use in hazardous areas
5Power supply
ON
ON
1
2
E
-
+
-
%
12401.5
E
-
+
-
ON
1
2
ESC
OK
KFD2-CRG2-
1.D
RS232
PWR
12
FLT
OUT
19 21
15
9
13
7
20
14
8
22 24
18
12
16
10
23
17
11
13 24
6
5
13
46
2
5
13 15
12
9
10
7
14
11
KFD2-CR4-1
PWR
3
3
3
3
5
5
5
5
2
1
4
4
4
4
A
B
C
D

Level Probe LGC2
Function and System Design
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A: Easy and cost-effective measuring point solution: power supplied to the device in
hazardous and non-hazardous areas via a transmitter power supply. Power supply and
additional control of two appliances, such as pumps, via a trip amplifier with local display.
B: An evaluation device offers power supply, local display and two switch outputs.
C: If several pumps are used, the pump service life can be prolonged by alternate switching.
With alternating pump control, the pump which was out of service for the longest period of time
is switched on. Use a suitable evaluation device for this application.
D: State-of-the-art recording technology with graphic display recorders for documentation,
monitoring, visualization and archiving purposes.
Application Examples with the Pt100 Resistance Thermometer
As standard, the complete measuring system consists of a level probe and a transmitter power
supply unit with a supply voltage of 10.5 to 30 V DC (hazardous areas) or 10.5 to 35 V DC
(non-hazardous areas).
Possible measuring point solutions with a signal converter and evaluation device:
Figure 2.3
E
F
2
3
4
3
4
5
5
5
6
6
6
7
7
7
1
2
5
12401.5
E
-
+
-
ON
1
2
ON
1
2
E
-
+
-
ON
1
2
E
-
+
-
ONON
1
2
E
-
+
-
ONON
1
2
E
-
+
-
%
ESC
OK
KFD2-CRG2-
1.D
RS232
PWR
12
FLT
OUT
19 21
15
9
13
7
20
14
8
22 24
18
12
16
10
23
17
11
13 24
6
5
ESC
OK
KFD2-CRG2-
1.D
RS232
PWR
12
FLT
OUT
19 21
15
9
13
7
20
14
8
22 24
18
12
16
10
23
17
11
13 24
6
5

2017-02
16
Level Probe LGC2
Function and System Design
E: If you wish to measure, display and evaluate the temperature as well as the level, e. g. to
monitor the temperature in fresh water for the purpose of detecting temperature limits for germ
formation, the options available to you include the following: The optionally available HUT
temperature head transmitter can convert the Pt100 signal into a 4 to 20 mA signal and
transfer it to any commonly used evaluation device. Some evaluation devices also offer a
direct input for the Pt100 signal.
F: If you wish to record and evaluate the level and temperature measured value with one
device, use evaluation devices with two inputs. It is even possible to mathematically link the
input signals with this unit.
2.4 Communication Protocol
4to20mAAnalog
Ordering information: product structure, feature "Electrical output", option "I2"
2.5 System Integration
The device can be given a tag name.
Ordering information: product structure, feature "Marking", option "1Z"
1Level probe LGC
2Connection for integrated Pt100 in the device
3Temperature for 4 to 20 mA
4Level for 4 to 20 mA
5Surge protection device, e. g. on the sensor side for field installation: for DIN mounting
rail mounting, selection in accordance with supply voltage, not for use in hazardous areas
6Surge protection device, e. g. for DIN mounting rail mounting, selection in accordance
with supply voltage, not for use in hazardous areas
7Power supply

Level Probe LGC2
Input
2017-02
17
3Input
3.1 Measured Value
Level probe and Pt100 (optional)
• Hydrostatic pressure of a liquid
• Pt100: temperature
HUT temperature head transmitter (optional) for device with
4 to 20 mA Analog
Temperature
3.2 Measuring Range
• Customer-specific measuring ranges or calibration that has been preset in the factory
• Temperature measurement of -10 to +70 °C(+14to+158°F) with Pt100 (optional)
Relative pressure
Absolute pressure
Measuring range
[bar (psi)]
Lowest calibratable span
1
[bar (psi)]
1
Largest turn down that can be configured at the factory: 10:1, higher turn down can be configured on request.
Vacuum resistance
[bar
abs
(psi
abs
)]
Option
2
2
See ordering information: product structure, feature "Measuring range".
0.1 (1.5) 0.01 (0.15) 0.3 (4.5) R1A
0.2 (3.0) 0.02 (0.3) 0.3 (4.5) R1C
0.4 (6.0) 0.04 (1.0) 0R1D
0.6 (9.0) 0.06 (1.0) 0R1E
1.0 (15.0) 0.1 (1.5) 0R2A
2.0 (30.0) 0.2 (3.0) 0R2C
4.0 (60.0) 0.4 (6.0) 0R2D
10.0 (150)
3
3
These measuring ranges are not available for the special version with plastic insulation, external diameter of
29 mm (1.14 inch).
1.0 (15) 0R3A
20.0 (300)
3
2.0 (30) 0R3C
Table 3.1
Measuring
range
[bar (psi)]
Lowest calibratable span
1
[bar (psi)]
1
Largest turn down that can be configured at the factory: 10:1, higher turn down can be configured on request.
Vacuum resistance
[bar
abs
(psi
abs
)]
Option
2
2
See ordering information: product structure, feature "Measuring range".
2.0 (30.0) 0.2 (3.0) 0A2C
4.0 (60.0) 0.4 (6.0) 0A2D
10.0 (150)
3
3
These measuring ranges are not available for the special version with plastic insulation, external diameter of
29 mm (1.14 inch).
1.0 (15) 0A3A
20.0 (300)
3
2.0 (30) 0A5A
Table 3.2

2017-02
18
Level Probe LGC2
Input
3.3 Input Signal
Level probe and Pt100 (optional)
• Change in capacitance
• Pt100: change in resistance
HUT temperature head transmitter (optional) for device with
4...20mAAnalog
Pt100 resistance signal, 4-wire

Level Probe LGC2
Output
2017-02
19
4Output
4.1 Output Signal
Level probe and Pt100 (optional)
• 4 to 20 mA Analog, 2-wire for hydrostatic pressure measured value.
Ordering information: product structure, feature "Electrical output", option "I2".
• Pt100: temperature-dependent resistance value
HUT temperature head transmitter (optional) for device with
4 to 20 mA Analog
4 to 20 mA Analog for temperature measured value, 2-wire
4.2 Signal Range
3.8 to 20.5 mA
4.3 Maximum Load
The maximum load resistance depends on the supply voltage (U) and must be determined
individually for each current loop, see formula and diagrams for device and temperature head
transmitter. The total resistance resulting from the resistances of the connected devices, the
connecting cable and, where applicable, the resistance of the probe connection may not
exceed the load resistance value.
Figure 4.1
ALoad diagram of the device for estimating the load resistance. Additional resistances,
such as the resistance of the extension cable, have to be subtracted from the value
calculated as shown in the equation.
BLoad diagram for HUT temperature head transmitter for estimating the load
resistance. Additional resistances must be subtracted from the value calculated as
shown in the equation.
R
Lmax
Max. load resistance []
R
add
Additional resistances such as resistance of evaluating device and/or display unit,
cable resistance []
USupply voltage [V]
LBasic length of probe connection [m] (cable resistance per wire 0.09 /m)
413
630
195
1065
35
20 25515
847
30 3020 25158
35 10
1080
880
480
280
680
80
RLmax –2x0.09 xL–R
U–10.5V
23 mA m–
R
U
–
8 V
0.025A
R
Lmax
add add
10.
R
[]
U
[ ]
V
AB
R
[]
U
[]
V

2017-02
20
Level Probe LGC2
Output
Note!
When using the measuring device in hazardous areas, installation must comply with the
corresponding national standards and regulations and the instruction manuals or installation or
control drawings (SI, ZD).