Pepperl+Fuchs LGC2 User manual

ISO9001
Level Probe LGC2
Hydrostatic Level
Measurement
4to20mAAnalog
PROCESS AUTOMATION
MANUAL

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

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Content
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1 Important Document Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Document Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.4 Terms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5 Turn down calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 Basic Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 Requirements for the Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Workplace Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4 Operational Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.5 Product Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Incoming Acceptance and Product Identification . . . . . . . . . . . . . . . . . . . 16
4.1 Incoming Acceptance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Product Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 Nameplates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 Storage and Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Additional Mounting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 Mounting the Device with a Mounting Clamp . . . . . . . . . . . . . . . . . . . 22
5.5 Mounting the Device with a Cable Mounting Screw . . . . . . . . . . . . . . 23
5.6 Mounting the Terminal Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.7 Mounting the HUT Temperature Head Transmitter with
Terminal Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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Content
5.8 Mounting the Terminal Block for the passive Pt100 Resistance
Thermometer (without HUT Temperature Head Transmitter) . . . . . 26
5.9 Cable Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.10 Cable Shortening Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.11 Post-installation check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1 Connecting the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.2 Supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.3 Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.4 Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.5 Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.6 Maximum Load for Device 4 to 20 mA Analog . . . . . . . . . . . . . . . . . . 32
6.7 Connecting the Measuring Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.8 Post-connection check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1 Overview of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8 Diagnostics and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.2 Troubleshooting Specific to Device with optional
Pt100 Resistance Thermometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
8.3 Troubleshooting Specific to HUT Temperature Head Transmitter . 37
9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.1 Exterior cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10 Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.1 General Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.2 Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.3 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

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12 Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
12.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
12.2 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
12.3 Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
12.4 Ambient Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
12.5 Process Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
12.6 Additional Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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Important Document Information
1 Important Document Information
1.1 Document Function
This document contains all the information that is required in various phases of the life cycle of
the device: from product identification, incoming acceptance and storage, to mounting,
connection, operation and commissioning through to troubleshooting, maintenance and
disposal.
1.2 Document Conventions
1.2.1 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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1.2.2 Electrical symbols
1.2.3 Tool symbols
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
Torx screwdriver
Flat blade screwdriver
Cross-head screwdriver
Allen key
Hexagon wrench
Table 1.2

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Important Document Information
1.2.4 Symbols for certain types of information
1.2.5 Symbols in graphics
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 1.3
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 1.4
,… ,1. 2. 3.
-
.

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Important Document Information
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1.3 Documentation
The documents listed are available on the product detail page of the appropriate product.
1.3.1 Technical Information (TI)
Planning aid for your device: TI00431O
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.
1.3.2 Brief Instructions (KA)
Getting the 1st measured value quickly: 4 to 20 mA Analog –KA01244O
The brief instructions contain all the essential information from incoming acceptance to initial
commissioning.
1.3.3 Manual (BA)
Your comprehensive reference: 4 to 20 mA Analog –BA01605O
These manual contain all the information that is required in various phases of the life cycle of
the device: from product identification, incoming acceptance and storage, to mounting,
connection, operation and commissioning through to troubleshooting, maintenance and
disposal.
1.3.4 Instruction Manuals (SI)
Depending on the approval, the following instruction manuals (SI) are supplied with the device.
They are an integral part of the documentation.
Option
1
1
See ordering information: product structure, feature "Approval".
Approval Documentation
E3 ATEX II 3G Ex nA IIC T6...T4 Gc SI00485O
EX ATEX II 2G Ex ia IIC T6...T4 Gb SI00454O
IC IEC Ex ia IIC T6...T4 Gb SI00455O
C1 CSA C/US IS Cl. I Div. 1 Group A-D, Ex ia, Zone 1 ZD00232O
F1 FM IS Cl. I Div. 1 Group A-D, AEx ia, Zone 1 ZD00231O
Table 1.5
Note!
The nameplate indicates the instruction manuals (SI) that are relevant to the device.

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Important Document Information
1.4 Terms and Abbreviations
Figure 1.1
URL OPLMWP
LRL
0
p
LRV URV
1
2
3
4

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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 1.6

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Important Document Information
1.5 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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Basic Safety Instructions
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2BasicSafetyInstructions
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
• Before beginning work, the specialist staff must have read and understood the instructions
in the manual and supplementary documentation as well as in the certificates (depending
on the application)
• Following instructions and basic conditions.
The operating personnel must fulfill the following requirements:
• Being instructed and authorized according to the requirements of the task by the facility's
owner-operator.
• Following the instructions in these manual.
2.2 Intended Use
2.2.1 Application and Media
The device is a hydrostatic pressure sensor for measuring the level of fresh water, wastewater
and salt water. The temperature is measured simultaneously in the case of sensor versions
with a Pt100 resistance thermometer. An optional temperature head transmitter converts the
Pt100 signal into a 4 to 20 mA signal.
2.2.2 Incorrect use
The manufacturer is not liable for damage caused by improper or non-designated use.
Verification for borderline cases:
For special fluids and fluids for cleaning, Pepperl+Fuchs is glad to provide assistance in
verifying the corrosion resistance of fluid-wetted materials, but does not accept any warranty or
liability.
2.3 Workplace Safety
For work on and with the device:
• Wear the required personal protective equipment according to federal/national regulations.
• Switch off the supply voltage before connecting the device.
2.4 Operational Safety
Risk of injury.
• Operate the device in proper technical condition and fail-safe condition only.
• The operator is responsible for interference-free operation of the device.

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Level Probe LGC2
Basic Safety Instructions
2.4.1 Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
• If, despite this, modifications are required, consult with Pepperl+Fuchs.
2.4.2 Repairs
To ensure continued operational safety and reliability,
• Carry out repairs on the device only if they are expressly permitted.
• Observe federal/national regulations pertaining to repair of an electrical device.
• Use original spare parts and accessories from Pepperl+Fuchs only.
2.4.3 Hazardous area
To eliminate danger to persons or the facility when the device is used in the approval-related
area (e. g. explosion protection, pressure vessel safety):
• Check the nameplate to verify if the device ordered can be put to its intended use in the
approval-related area.
• Observe the specifications in the separate supplementary documentation that is an
integral part of these manual.
2.5 Product Safety
This measuring device is designed in accordance with good engineering practice to meet
state-of-the-art safety requirements, has been tested, and left the factory in a condition in
which they are safe to operate.
It meets general safety standards and legal requirements. It also complies with the
EU directives listed in the device-specific EU Declaration of Conformity. Pepperl+Fuchs
confirms this by affixing the CE mark to the device.

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Product Description
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3ProductDescription
3.1 Function
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 3.1
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
.
.
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
Incoming Acceptance and Product Identification
4 Incoming Acceptance and Product Identification
4.1 Incoming Acceptance
Is the order code on the delivery note (1) identical to the order code on the product sticker (2)?
Are the goods undamaged?
Do the data on the nameplates correspond to the order specifications on the delivery note?
Is the documentation available?
If required (see nameplate): Are the instruction manuals (SI) present?
Table 4.1
Note!
If one of these conditions is not met, please contact your Pepperl+Fuchs sales office.
DELIVERY NOTE
1 = 2
Dat./Insp.:
:
.r
e
V
.WF
:
.
v
eR
.
v
e
D
Cal./Adj.
Mat: L=
:
.
o
n
.
r
e
S
:
e
d
o
c
r
e
d
r
O
:
e
d
oc
r
e
d
r
o
.
tx
E
TAG:
p
DELIVERY NOTE
Dat./Insp.:
FW.Ver.:
Dev.Rev.:
Cal./Adj.
Mat: L=
Ser. no.:
Order code:
Ext. order code:
TAG:
p

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Incoming Acceptance and Product Identification
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4.2 Product Identification
The following options are available for identification of the measuring device:
• Nameplate data
• Order code with breakdown of the device features on the delivery note
• Scan the 2-D matrix code (QR code) on the nameplate: all the information for the
measuring device is displayed.
4.3 Nameplates
4.3.1 Nameplates on probe connection (extension cable)
Figure 4.1
1Order code (shortened for reordering); The meaning of the individual letters and digits is
explained in the order confirmation details.
2Extended order number (complete)
3Serial number (for clear identification)
4TAG (device tag)
5Device connection diagram
6Pt100 connection diagram (optional)
7Warning (hazardous area), (optional)
8Length of probe connection (extension cable)
9Approval symbol, e. g. CSA, FM, ATEX (optional)
10 Text for approval (optional)
11 Materials in contact with process
12 Test date (optional)
13 Device version
14 Supply voltage
15 Output signal
16 Set measuring range
17 Nominal measuring range
Dat./Insp.:
FW.Ver.:
Dev.Rev.:
Cal./Adj.
Mat: L=
Ser. no.:
Order code:
Ext. order code:
TAG:
p
1 2
17
16
15
14
34
5
6/7
89
101112
13

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Level Probe LGC2
Incoming Acceptance and Product Identification
4.3.2 Additional nameplate for devices with approvals
Figure 4.2
4.3.3 Additional nameplate for devices with external diameter
22 mm (0.87 inch) and 42 mm (1.65 inch)
Figure 4.3
1Approval symbol
2Reference to associated documentation
3Approval number
Mat.: 316L/1.4435/1.4404, Al O , PE, EPDM, PPO
23 For use in drinking water according to:
250002737-B
1
23
1Serial number
2Nominal measuring range
3Set measuring range
4CE mark or approval symbol
5Certificate number (optional)
6Text for approval (optional)
7Reference to documentation
x
Install per dwg. 96000xxxx-
Ser.-No.:
p
Cal./Adj.
123 4 5 6 7

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Incoming Acceptance and Product Identification
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4.4 Storage and Transport
4.4.1 Storage Conditions
Use original packaging.
Store the measuring device in clean and dry conditions and protect from damage caused by
shocks (EN 837-2).
Storage Temperature Range
Level probe and Pt100 (optional)
-40 to +80 °C(-40to+176°F)
Probe connection (extension cable)
(when mounted in a fixed position)
•WithPE:-30to+70°C(-22to+158°F)
•WithFEP:-30to+80°C(-22to+176°F)
Te r m i n a l b ox
-40 to +80 °C(-40to+176°F)
HUT temperature head transmitter (optional) for device with 4 to 20 mA Analog
-40 to +100 °C (-40 to +212 °F)
4.4.2 Transporting the Product to the Measuring Point
4.5 Scope of Delivery
The scope of delivery comprises:
• Level probe LGC2, optionally with integrated Pt100 resistance thermometer
• Optional accessories
Documentation supplied:
• The BA01605O manual are available on the internet.
• Brief instructions KA01244O
• Final inspection report
• Potable water approvals (optional): SD00289O, SD00319O
• Devices that are suitable for use in hazardous areas: additional documentation e. g.
instruction manuals (SI, ZD)
Warning!
Risk of injury by incorrect transport
Device or cable may become damaged, and there is a risk of injury!
• Transport measuring device in the original packaging.
• Follow the safety instructions and transport conditions for devices weighing more than
18 kg (39.6 lbs).

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Level Probe LGC2
Installation
5Installation
5.1 Installation Instructions
Figure 5.1
1Cable mounting screw can be ordered as an accessory
2Terminal box can be ordered as an accessory
3Bending radius of extension cable > 120 mm (4.72 inch)
4Mounting clamp can be ordered as an accessory
5Probe connection (extension cable), cable length
6Guide tube
7Level probe LGC
8Additional weight can ordered be an accessory for the level probe with external diameter
of 22 mm (0.87 inch) and 29 mm (1.14 inch)
9Protection cap
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OPEN
CLOSE
90°
90°
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