Pepperl+Fuchs Pulscon LTC51 Technical Information

ISO9001

3

PROCESS AUTOMATION

TECHNICAL INFORMATION

Pulscon LTC51

Guided Level Radar

Pulscon LTC51

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"

Application

• Rod, rope or coax probe

• Process connection: Starting 3/4 in thread or flange

• Temperature: -40 ... +200 °C (-40 ... +392 °F)

• Pressure: -1 ... +40 bar (-14.5 ... +580 psi)

• Maximum measuring range: Rod 10 m (33 ft); rope 45 m (148 ft); coax 6 m (20 ft)

• Accuracy: ±2mm(0.08in)

• International explosion protection certificates; WHG; ship building approval; steam boiler approval;
EN 10204-3.1

• Linearity protocol (5-point)

Yo ur b e ne f it s

• Reliable measurement even for changing product and process conditions

• HistoROM data management for easy commissioning, maintenance and diagnostics

• Highest reliability due to Multi-Echo Tracking

• Hardware and software developed according to IEC 61508 (up to SIL3)

• Seamless integration into control or asset management systems

• Intuitive user interface in national languages

• Easy proof test for SIL and WHG

Pulscon LTC51

Content

1 Important document information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Function and system design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Measuring principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Life cycle of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.1 Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.2 Measuring range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.3 Blocking distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.4 Measuring frequency spectrum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 Signal on alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Linearization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.4 Galvanic isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.5 Protocol-specific data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.1 Terminal assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

5.2 HART Loop Converter KFD2-HLC-Ex1.D.** . . . . . . . . . . . . . . . . . . . . . 28

5.3 Device plug connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.4 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.5 Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.6 Current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.7 Power supply failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.8 Potential equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.9 Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.10 Cable entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.11 Cable specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.12 Overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

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Content

6 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.1 Reference operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.2 Maximum measured error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.3 Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.4 Reaction time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.5 Influence of ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.6 Influence of gas layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.7 Gas phase compensation with external pressure sensor

(PROFIBUS PA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

7 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.1 Mounting requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8 Operating conditions: Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

8.1 Ambient temperature range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

8.2 Ambient temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

8.3 Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.4 Climate class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.5 Altitude according to IEC 61010-1 Ed.3 . . . . . . . . . . . . . . . . . . . . . . . . 66

8.6 Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.7 Vibration resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.8 Cleaning the probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.9 Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . 67

9 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.1 Process temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.2 Process pressure range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.3 Dielectric constant (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

9.4 Expansion of the rope probes through temperature . . . . . . . . . . . . . 69

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Content

10 Mechanical construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10.1 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10.2 Tolerance of probe length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

10.3 Surface roughness of Alloy C coated flanges . . . . . . . . . . . . . . . . . . . 74

10.4 Shortening probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

10.5 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

10.6 Materials: A1 (GT19) housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

10.7 Materials: A2 (GT20) housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

10.8 Materials: A3 (GT18) housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10.9 Materials: Process connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.10 Materials: Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.11 Materials: Mounting bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

10.12 Materials: Adapter and cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

10.13 Materials: Weather protection cover . . . . . . . . . . . . . . . . . . . . . . . . . . 85

11 Operability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

11.1 Operating concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

11.2 Local operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.3 Remote operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

12 Certificates and approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.1 CE mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.2 C-Tick symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.3 Ex approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.4 Dual seal according to ANSI/ISA 12.27.01 . . . . . . . . . . . . . . . . . . . . . . 90

12.5 Functional Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.6 Overfill prevention. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

12.7 Telecommunications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

12.8 CRN approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

12.9 Other standards and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

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Content

13 Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

13.1 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

13.2 Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

13.3 5-point linearity protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

13.4 Customized parametrization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

14 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

14.1 Device-specific accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

14.2 Communication-specific accessories . . . . . . . . . . . . . . . . . . . . . . . . 105

14.3 Service-specific accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

14.4 System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

15 Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

15.1 Standard documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

15.2 Safety documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

16 Registered trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

17 Patents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

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Important document information

1 Important document information

1.1 Symbols

1.1.1 Symbols used

This document contains information that you must read for your own personal safety and to
avoid property damage. Depending on the hazard category, the warning signs are displayed in
descending order as follows:

Safety-relevant symbols

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 devices and any connected facilities or systems, or result in
their complete failure.

Informative symbols

Note!

This symbol brings important information to your attention.

Action

This symbol indicates a paragraph with instructions.

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-

Important document information

1.1.2 Electrical symbols

Symbol Meaning

)

*

Table 1.1

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.

1.1.3 Symbols in graphics

Symbol Meaning
1, 2, 3 ... Item numbers

,…,1. 2. 3.

A, B, C, ... Views
A-A, B-B, C-C, ... Sections

.

Table 1.2

Series of steps

Hazardous area

Indicates a hazardous area.

Safe area (non-hazardous area)

Indicates a non-hazardous location.

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Pulscon LTC51

F

L

D

E

20 mA
100%

4mA
0%

LN

R

Function and system design

2 Function and system design

2.1 Measuring principle

2.1.1 Basic principles

The device is a "downward-looking" measuring system that functions according to the ToF
method (ToF = Time of Flight). The distance from the reference point to the product surface is
measured. High-frequency pulses are injected to a probe and led along the probe. The pulses
are reflected by the product surface, received by the electronic evaluation unit and converted
into level information. This method is also known as TDR (Time Domain Reflectometry).

Figure 2.1 Parameters for level measurement with the guided radar

LN Probe length
D Distance
L Level
R Reference point of measurement
E Empty calibration (= zero)
F Full calibration (= span)

Note!

If, for rope probes, the DC value is less than 7, then measurement is not possible in the area of
the straining weight (0 to 250 mm from end of probe; lower blocking distance).

2.1.2 Dielectric constant

The dielectric constant (DC) of the medium has a direct impact on the degree of reflection of
the high frequency pulses. In the case of large DC values, such as for water or ammonia, there
is strong pulse reflection while, with low DC values, such as for hydrocarbons, weak pulse
reflection is experienced.

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Function and system design

2.1.3 Input

The reflected pulses are transmitted from the probe to the electronics. There, a
microprocessor analyzes the signals and identifies the level echo which was generated by the
reflection of the high-frequency pulses at the product surface. This clear signal detection
system benefits from over 30 years' experience with pulse time-of-flight procedures.

The distance D to the product surface is proportional to the time of flight t of the impulse:

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

Note!

The reference point R of the measurement is located at the process connection.
See chapter 10.

The device possesses functions for interference echo suppression that can be activated by the
user. They guarantee that interference echoes from e. g. internals and struts are not
interpreted as level echoes.

2.1.4 Output

The device is preset at the factory to the probe length ordered so that in most cases only the
application parameters that automatically adapt the device to the measuring conditions need
to be entered. For models with a current output, the factory adjustment for zero point E and
span F is 4 mA and 20 mA, for digital outputs and the display module 0 % and 100 %. A
linearization function with max. 32 points, which is based on a table entered manually or semi­automatically, can be activated on site or via remote operation. This function allows the level to
be converted into units of volume or mass, for example.

2.2 Life cycle of the product

Engineering

• Universal measuring principle

• Measurement unaffected by medium properties

• Hardware and software developed according to SIL IEC 61508

Procurement

• Pepperl+Fuchs being the world market leader in level measurement guarantees asset
protection

• Worldwide support and service

10

Installation

• Special tools are not required

• Reverse polarity protection

• Modern, detachable terminals

• Main electronics protected by a separate connection compartment

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Function and system design

Commissioning

• Fast, menu-guided commissioning in only 6 steps

• Plain text display in national languages reduces the risk of error or confusion

• Direct local access of all parameters

• Short instruction manual at the device

Operation

• Multi-echo tracking: Reliable measurement through self-learning echo-search algorithms
taking into account the short-term and long-term history in order to check the found echoes
for plausibility and to suppress interference echoes.

• Diagnostics in accordance with NAMUR NE 107

Maintenance

• HistoROM: Data backup for instrument settings and measured values

• Exact instrument and process diagnosis to assist fast decisions with clear details
concerning remedies

• Intuitive, menu-guided operating concept in national languages saves costs for training,
maintenance and operation

• Cover of the electronics compartment can be opened in hazardous areas

Retirement

• Order code translation for subsequent models

• RoHS-conforming (Restriction of certain Hazardous Substances), unleaded soldering of
electronic components

• Environmentally sound recycling concept

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Function and system design

2.3 Measuring system

2.3.1 General notes on probe selection

• Normally use rod probes for liquids. Rope probes are used in liquids for measuring ranges
> 10 m (33 ft) and with restricted ceiling clearance which does not allow the installation of
rigid probes.

• Coax probes are suited to liquids with viscosities of up to approx. 500 cst. Coax probes
can measure most liquefied gases, as of a dielectric constant of 1.4. Moreover, installation
conditions, such as nozzles, tank internal fittings etc., have no effect on the measurement
when a coax probe is used. A coax probe offers maximum EMC safety when used in
plastic tanks.

Probe selection

The various types of probe in combination with the process connections are suitable for the
following applications

1

:

Type of probe Rod probe Rope probe Coax probe

Feature "Probe" Option Option Option

1 8 mm (316L) 2 4 mm (316) 4 ... mm (316L)
5 1/3 in (316L) 3 1/6 in (316) G ... inch (316L)
8 12 mm (316L) E 4 mm (316) with

H ... mm (Alloy C)

center rod

9 1/2 in (316L) F 1/6 in (316) with

K ... inch (Alloy C)

center rod
6 12 mm (Alloy C)
7 1/2 in (Alloy C)
A

16 mm (316L) divisible

C
B

0.63 in (316L) divisible

D

Max. probe length 10 m (33 ft)

b

45 m (148 ft) 6 m (20 ft)

For application Level measurement in liquids

Table 2.1

a

a

Multiple punched for process connections G1-1/2 in or flange

b

Maximum probe length for indivisible rod probes: 4 m (13 ft)

1

If required, rod and rope probes can be replaced. They are secured with Nord-Lock washers or a thread coating.
For further information on service and spare parts please contact the Pepperl+Fuchs service.

12

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Input

3Input

3.1 Measured variable

The measured variable is the distance between the reference point and the product surface.

Subject to the empty distance entered E the level is calculated.

Alternatively, the level can be converted into other variables (volume, mass) by means of
linearization (32 points).

3.2 Measuring range

The following table describes the media groups and the possible measuring range as a
function of the media group.

Pulscon LTC51
Media

group

1 1.4 ... 1.6 condensed gases,

2 1.6 ... 1.9 • liquefied gas,

3 1.9 ... 2.5 mineral oils, fuels • one-piece: 4 m (13 ft)

4 2.5 ... 4 • benzene, styrene,

5 4 ... 7 • chlorobenzene,

6 >7 •aqueous

Table 3.1

DC (r) Typical liquids Measuring range

bare metallic
rod probes

e. g. N2, CO

e. g. propane

•solvent

•Freon

•palm oil

toluene

•furan

• naphthalene

chloroform

• cellulose spray

• isocyanate,
aniline

solutions

•alcohols

• ammonia

2

on request 6 m (20 ft)

• one-piece: 4 m (13 ft)

• divisible: 10 m (33 ft)

• divisible: 10 m (33 ft)

• one-piece: 4 m (13 ft)

• divisible: 10 m (33 ft)

• one-piece: 4 m (13 ft)

• divisible: 10 m (33 ft)

• one-piece: 4 m (13 ft)

• divisible: 10 m (33 ft)

bare metallic
rope probes

15 ... 22 m
(49 ... 72 ft)

22 ... 32 m
(72 ... 105 ft)

32 ... 42 m
(105 ... 138 ft)

42 ... 45 m
(138 ... 148 ft)

45 m (148 ft) 6 m (20 ft)

coax probes

6 m (20 ft)

6 m (20 ft)

6 m (20 ft)

6 m (20 ft)

Note!

Reduction of the max. possible measuring range through buildup, above all of moist products.
Due to the high diffusion rate of ammonia it is recommended with gas-tight bushing for

measurements in this medium.

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F

UB

E

100%

0%

LN

R

SD

Input

3.3 Blocking distance

The upper blocking distance (= UB) is the minimum distance from the reference point of the
measurement (mounting flange) to the maximum level.

Figure 3.1 Definition of blocking distance and safety distance

R Reference point of measurement
LN Probe length
UB Upper blocking distance
E Empty calibration (= zero)
F Full calibration (= span)
SD Safety distance

Blocking distance (factory setting):

• with coax probes: 0mm(0in)

• with rod and rope probes up to 8 m (26 ft): 200 mm (8 in)

• with rod and rope probes exceeding a length of 8 m (26 ft): 0.025 x (length of probe)

Note!

The specified blocking distances are preset on delivery. Depending on the application these
settings can be changed.

For rod and rope probes and for media with DC > 7 (or generally for stilling well/bypass
applications) the blocking distance may be reduced to 100 mm (4 in).

Within the blocking distance, a reliable measurement can not be guaranteed.

Note!

A safety distance SD can be defined in addition to the blocking distance. A warning is
generated if the level rises into this safety distance.

3.4 Measuring frequency spectrum

100 MHz to 1.5 GHz

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Pulscon LTC51

Output

4Output

4.1 Output signal

HART

Signal coding FSK ±0.5 mA over currency signal
Data transmission rate 1200 Baud
Galvanic isolation Yes

Table 4.1

PROFIBUS PA

Signal coding Manchester Bus Powered (MBP)
Data transmission rate 31.25 kBit/s, voltage mode
Galvanic isolation Yes

Table 4.2

Switch output

Note!

For HART devices, the switch output is available as an option. See product structure, feature
"Electrical Output", option ID. Devices with PROFIBUS PA always have a switch output.

Switch output
Function Open collector switching output

Switching behavior Binary (conductive or non-conductive), switches when the

programmable switch point is reached
Failure mode non-conductive
Electrical connection values U = 10.4 ... 35 V DC, I = 0 ... 40 mA
Internal resistance RI < 880 

The voltage drop at this internal resistance has to be taken

into account on planning the configuration. For example, the

resulting voltage at a connected relay must be sufficient to

switch the relay.
Insulation voltage floating, Insulation voltage 1350 V DC to power supply and

Switch point freely programmable, separately for switch-on and switch-off

Switching delay freely programmable from 0 to 100 s, separately for switch-

Number of switching cycles corresponds to the measuring cycle
Signal source

device variables

Number of switching cycles unlimited

Table 4.3

500 V AC to ground

point

on and switch-off point

• Level linearized

•Distance

• Terminal voltage

• Electronic temperature

• Relative echo amplitude

• Diagnostic values, Advanced diagnostics

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15

Pulscon LTC51

Output

4.2 Signal on alarm

Depending on the interface, failure information is displayed as follows:

• Current output (for HART devices)

• Fail-safe mode selectable (in accordance with NAMUR Recommendation NE 43):
Minimum alarm: 3.6 mA
Maximum alarm (= factory setting): 22 mA

• Fail-safe mode with user-selectable value: 3.59 ... 22.5 mA

•Local display

• Status signal (in accordance with NAMUR Recommendation NE 107)

• Plain text display

• Operating tool via digital communication (HART, PROFIBUS PA) or service interface (CDI)

• Status signal (in accordance with NAMUR Recommendation NE 107)

• Plain text display

4.3 Linearization

The linearization function of the device allows the conversion of the measured value into any
unit of length or volume. Linearization tables for calculating the volume in cylindrical tanks are
pre-programmed. Other tables of up to 32 value pairs can be entered manually or semi­automatically.

4.4 Galvanic isolation

All circuits for the outputs are galvanically isolated from each other.

16

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Pulscon LTC51

Output

4.5 Protocol-specific data

HART

Manufacturer ID 17 (0x11)
Device type ID 0x34
HART specification 6.0
Device description files

(DTM, DD)

HART load Min. 250
HART device variables The measured values can be freely assigned to the device

Supported functions •Burst mode

Table 4.4

Information and files under:

• www.pepperl-fuchs.com

• www.hartcomm.org

variables.
Measured values for PV (primary variable)

• Level linearized

•Distance

• Electronic temperature

• Relative echo amplitude

Measured values for SV, TV, FV (second, third and fourth
variable)

• Level linearized

•Distance

• Terminal voltage

• Electronic temperature

• Absolute echo amplitude

• Relative echo amplitude

• Calculated DC

• Additional transmitter status

Wireless HART data

Minimum start-up voltage 11.4 V
Start-up current 3.6 mA
Start-up time 15 s
Minimum operating voltage 11.4 V
Multidrop current 3.6 mA
Set-up time 1 s

Table 4.5

2014-10

17

Pulscon LTC51

Output

PROFIBUS PA

Manufacturer ID 93 (5D HEX)
Ident number 0E3B HEX
Profile version 3.02
GSD file Information and files under:
GSD file version

Output values Analog Input:

Input values Analog Output:

Supported functions • Identification & Maintenance

Table 4.6

• www.pepperl-fuchs.com

•www.profibus.org

• Level linearized

•Distance

• Terminal voltage

• Electronic temperature

• Absolute echo amplitude

• Relative echo amplitude

• Calculated DC

Digital Input:

• Extended diagnostic blocks

• Status output PFS Block

• Analog value from PLC (for sensor block external
pressure and temperature)

• Analog value from PLC to be indicated on the display

Digital Output:

• Extended diagnostic block

• Level limiter

• Sensor block measurement on

• Sensor block save history on

• Status output

Simple device identification via control system and
nameplate

• Automatic Ident Number Adoption
GSD compatibility mode with respect to the previous
device

• Physical Layer Diagnostics
Installation check of the PROFIBUS segment via
terminal voltage and telegram monitoring

•PROFIBUS Up-/Download
Up to 10 times faster reading and writing of parameters
via PROFIBUS Up-/Download

•Condensed Status
Simple and self-explanatory diagnostic information due
to categorization of diagnostic messages

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Pulscon LTC51

+

–

4 ... 20 mA

5412

7

8

3

+

–

1

+

2

4...20mA
HART

10

mm

2- wire

leve

l

4-20

mA

4-20

mA

HA

RT

[21]

open

-

6

~

Power supply

5 Power supply

5.1 Terminal assignment

2-wire: 4 ... 20 mA HART

Figure 5.1 Terminal assignment 2-wire; 4 ... 20 mA HART

1 Active barrier with power supply (e. g. KCD2-STC-Ex1): observe terminal voltage
2 HART communication resistor ( 250 ): observe maximum load
3 Connection for optional field communicator
4 Analog display device: observe maximum load
5 Cable screen; observe cable specification
6 4 ... 20 mA HART (passive): terminals 1 and 2
7 Terminal for potential equalization line
8 Cable entry

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19

Pulscon LTC51

1

+

2

4...20 mA
HART

10 mm

2- wire

4-20 mA PFS

HA

RT

[02/03

]

ope

n

-

1

+

2

-

3

+

4

-

10

9

8

7

+

-

23

4

6

5

1

4 ... 20 mA

≥ 250 Ω

3+

4-

+

–

Power supply

2-wire: 4 ... 20mA HART, switch output

Figure 5.2 Terminal assignment 2-wire; 4 ... 20mA HART, switch output

1 Active barrier with power supply (e. g. KCD2-STC-Ex1): observe terminal voltage
2 HART communication resistor ( 250 ): observe maximum load
3 Connection for optional field communicator
4 Analog display device: observe maximum load
5 Cable screen; observe cable specification
6 4 ... 20 mA HART (passive): terminals 1 and 2
7 Switch output (open collector): terminals 3 and 4
8 Terminal for potential equalization line
9 Cable entry for 4 ... 20 mA HART line
10 Cable entry for switch output line

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Pulscon LTC51

1

3

+

+

2

4

4...20mA
HART

4...20mA

10 mm

2- wire

level

4-20 mA 4-20 mA

HA

RT

[04/05]

open

-

-

10

13
12
11

+

+

-

-

1

2

3

9

586

74

4

+

–

+

–

4 ... 20 mA

4 ... 20 mA

Power supply

2-wire: 4 ... 20 mA HART, 4 ... 20 mA

Figure 5.3 Terminal assignment 2-wire, 4 ... 20 mA HART, 4 ... 20 mA

1 Connection current output 2
2 Connection current output 1
3 Supply voltage for current output 1 (e. g. KCD2-STC-Ex1); observe terminal voltage
4 Cable screen; observe cable specification
5 HART communication resistor ( 250 ): observe maximum load
6 Connection for optional field communicator
7 Analog display device; observe maximum load
8 Analog display device; observe maximum load
9 Supply voltage for current output 2 (e. g. KCD2-STC-Ex1); observe terminal voltage
10 Current output 2: terminals 3 and 4
11 Terminal for the potential equalization line
12 Cable entry for current output 1
13 Cable entry for current output 2

Note!

This version is also suited for single-channel operation. In this case, current output 1
(terminals 1 and 2) must be used.

2014-10

21

Pulscon LTC51

3

1

+

L+

4

2

4...20 mA
HA

RT

10.4...48V=

10

mm

2- wire

4-20 mA

HA

RT

[08

]

ope

n

-

L-

13
12

11

910

+

-

23

4

6

7

8

5

1

4 ... 20 mA

250Ω

Power supply

4-wire: 4 ... 20 mA HART (10.4 ... 48 V DC)

Figure 5.4 Terminal assignment 4-wire; 4 ... 20mA HART (10.4 ... 48 V DC)

1 Evaluation unit, e. g. PLC
2 HART communication resistor ( 250 ): observe maximum load
3 Connection for optional field communicator
4 Analog display device: observe maximum load
5 Signal cable including screening (if required), observe cable specification
6 Protective connection; do not disconnect!
7 Protective earth, observe cable specification
8 4 ... 20 mA HART (active): terminals 3 and 4
9 Supply voltage: terminals 1 and 2
10 Supply voltage: Observe terminal voltage, observe cable specification
11 Terminal for potential equalization
12 Cable entry for signal line
13 Cable entry for power supply

Warning!

To ensure electrical safety:

• Do not disconnect the protective connection (6).

• Disconnect the supply voltage before disconnecting the protective earth (7).

Note!

Connect protective earth to the internal ground terminal (7) before connecting the supply
voltage. If necessary, connect the potential matching line to the external ground terminal (11).

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Pulscon LTC51

Power supply

Note!

In order to ensure electromagnetic compatibility (EMC): Do not only ground the device via the
protective earth conductor of the supply cable. Instead, the functional grounding must also be
connected to the process connection (flange or threaded connection) or to the external ground
terminal.

Note!

An easily accessible power switch must be installed in the proximity of the device. The power
switch must be marked as a disconnector for the device (IEC/EN 61010).

2014-10

23

Pulscon LTC51

3

1

+

L

4

2

4...20 mA
HA

RT

90...2

53

V~

10

mm

2- wire

4-20 mA

HA

RT

[09

]

ope

n

-

N

13
12

11

910

+

-

23

4

6

7

8

5

1

4 ... 20 mA

≥ 250Ω

Power supply

4-wire: 4 ... 20 mA HART (90 ... 253 V AC)

Figure 5.5 Terminal assignment 4-wire; 4 ... 20 mA HART (90 ... 253 V AC)

1 Evaluation unit, e. g. PLC
2 HART communication resistor ( 250 ): observe maximum load
3 Connection for optional filed communicator
4 Analog display device: observe maximum load
5 Signal cable including screening (if required), observe cable specification
6 Protective connection; do not disconnect!
7 Protective earth, observe cable specification
8 4 ... 20 mA HART (active): terminals 3 and 4
9 Supply voltage: terminals 1 and 2
10 Supply voltage: observe terminal voltage, observe cable specification
11 Terminal for potential equalization
12 Cable entry for signal line
13 Cable entry for power supply

Warning!

To ensure electrical safety:

• Do not disconnect the protective connection (6).

• Disconnect the supply voltage before disconnecting the protective earth (7).

Note!

Connect protective earth to the internal ground terminal (7) before connecting the supply
voltage. If necessary, connect the potential matching line to the external ground terminal (11).

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Pulscon LTC51

Power supply

Note!

In order to ensure electromagnetic compatibility (EMC): Do not only ground the device via the
protective earth conductor of the supply cable. Instead, the functional grounding must also be
connected to the process connection (flange or threaded connection) or to the external ground
terminal.

Note!

An easily accessible power switch must be installed in the proximity of the device. The power
switch must be marked as a disconnector for the device (IEC/EN 61010).

2014-10

25

Pulscon LTC51

1

1

+

+

2

2

PA

[06/07]

-

-

1

3

+

+

2

4

PA

10 mm

2- wire

level

4-20 mA PFS

[26/27]

open

-

-

4

1

2

3

5

3+

4-

Power supply

PROFIBUS PA

Figure 5.6 Terminal assignment PROFIBUS PA

1 Cable screen: observe cable specifications
2 Switch output (open collector): terminals 3 and 4
3 Connection PROFIBUS PA: terminals 1 and 2
4 Terminal for potential equalization line
5 Cable entries

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Pulscon LTC51

Power supply

Connection examples for the switch output

Note!

For HART devices, the switch output is available as an option. See product structure, feature
"Electrical Output", option ID. Devices with PROFIBUS PA always have a switch output.

3+

4-

+

1

+

-

3+

4-

2

Connection of a relay
Suitable relays (examples):

• Solid-state relay: Phoenix Contact OV-

Connection of a digital input

1 Pull-up resistor
2 Digital input

24DC/480AC/5 with mounting rail
connector UMK-1 OM-R/AMS

• Electromechanical relay: Phoenix
Contact PLC-RSC-12DC/21

Table 5.1

Note!

For optimum interference immunity we recommend to connect an external resistor (internal
resistance of the relay or Pull-up resistor) of < 1000 .

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27

Pulscon LTC51

Stromausgang1

Relais1

Stromausgang2

Stromausgang3

Relais2Relais2

versorgungversorgung

EingangEingang

1
2
3

4
5
6

7

8

9

11
12

13

14

15

19

20

21

16
17

18

22

23

24

24V DC

10

HART Loop Converter

HART

+

-

+

Current output 1

Relay 1

Current output 2

Current output 3

Relay 2

Power
supply

Input

Auxiliary energy

HART

ESC

OK

KFD2-HLC­Ex1.D.2W

RS232

PWR

ERR

1 2

OUT

19 21

15

9

13

7

20

14

8

2

2

24

18

12

16

10

23

17

11

1

3

2 4

6

5

Power supply

5.2 HART Loop Converter KFD2-HLC-Ex1.D.**

The dynamic variables of the HART protocol can be converted into individual 4 to 20 mA
sections using the HART loop converter KFD2-HLC-Ex1.D.**. The variables are assigned to
the current output and the measuring ranges of the individual parameters are defined in the
KFD2-HLC-Ex1.D.**.

28

Figure 5.7 Connection example KFD2-HLC-Ex1.D.**: passive 2-wire device and current outputs

The HART loop converter KFD2-HLC-Ex1.D.** can be acquired.

Note!

Additional documentation: see data sheets.

connected as power source

2014-10

Pulscon LTC51

21

3

4

2

1

4

3

Power supply

5.3 Device plug connectors

Note!

For the versions with fieldbus plug connector (M12 or 7/8 in), the signal line can be connected
without opening the housing.

Pin assignment of the M12 plug connector

Pin Meaning
1 Signal +
2 not connected
3 Signal ­4 Ground

Table 5.2

Pin assignment of the 7/8 in plug connector

Table 5.3

Pin Meaning
1 Signal ­2 Signal +
3 not connected
4 Screen

2014-10

29

Pulscon LTC51

R [Ω]

[V]U

0

10

11.5 22.5

20 30 35

0

500

R [Ω]

[V]U

0

10

13.5 24.5

20 30

0

500

Power supply

5.4 Power supply

An external power supply is required.

Note!

Various supply units can be ordered from Pepperl+Fuchs: see chapter 14.4.

2-wire, 4 ... 20 mA HART, passive

Approval

•Non-Ex

•ExnA

•CSAGP

•Exic 11.5 ... 32 V

•Exia/IS 11.5 ... 30 V

•Exd/XP

•Exic(ia)

• Ex tD/DIP

a

Terminal voltage U at the
device

11.5 ... 35 V

13.5 ... 30 V

1

Maximum load R, depending on the supply voltage

at the supply unit

U

0

b

c

d

e

Table 5.4

a

Feature "Approval" of the product structure

b

For ambient temperatures Ta  -30 °C (-22 °F) a minimum voltage of 14 V is required for the startup of the device at the
MIN error current (3.6 mA). The startup current can be parametrized. If the device is operated with a fixed current I  4.5 mA

(HART multidrop mode), a voltage of U  11.5 V is sufficient throughout the entire range of ambient temperatures.

c

For ambient temperatures Ta  -30 °C (-22 °F) a minimum voltage of 14 V is required for the startup of the device at the
MIN error current (3.6 mA). The startup current can be parametrized. If the device is operated with a fixed current I  4.5 mA

(HART multidrop mode), a voltage of U  11.5 V is sufficient throughout the entire range of ambient temperatures.

d

For ambient temperatures Ta  -30 °C (-22 °F) a minimum voltage of 14 V is required for the startup of the device at the
MIN error current (3.6 mA). The startup current can be parametrized. If the device is operated with a fixed current I  4.5 mA

(HART multidrop mode), a voltage of U  11.5 V is sufficient throughout the entire range of ambient temperatures.

e

For ambient temperatures Ta  -20 °C (-4 °F) a minimum voltage of 16 V is required for the startup of the device at the MIN error
current (3.6 mA).

1

Feature "Electrical Output" of the product structure, option IH

30

2014-10