Burkert 8111 User Manual [en, de, fr]

Operating Instructions

LEVEL SWITCH 8111

with NAMUR output

Contents

Contents

1 About this document

1.1 Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Target group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Symbolism used. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 For your safety

2.1 Authorised personnel . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Appropriate use . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Warning about misuse . . . . . . . . . . . . . . . . . . . . . . .

2.4 General safety instructions . . . . . . . . . . . . . . . . . . . .

2.5 Safety label on the instrument . . . . . . . . . . . . . . . . . .

2.6 CE conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7 SIL conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8 Safety instructions for Ex areas . . . . . . . . . . . . . . . . .

3 Product description

3.1 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Principle of operation . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Storage and transport . . . . . . . . . . . . . . . . . . . . . . . .

4 Mounting

4.1 General instructions . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Instructions for installation . . . . . . . . . . . . . . . . . . . . .

4
4
4

5
5
5
5
6
6
6
6

7
8
8
9

10
13

5 Connecting to power supply

5.1 Preparing the connection . . . . . . . . . . . . . . . . . . . . .

5.2 Connection procedure. . . . . . . . . . . . . . . . . . . . . . . .

5.3 Wiring plan, single chamber housing . . . . . . . . . . . . .

6 Set up

6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 Adjustment elements . . . . . . . . . . . . . . . . . . . . . . . .

6.3 Function chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Maintenance and fault rectification

7.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.2 Remove interferences. . . . . . . . . . . . . . . . . . . . . . . .

7.3 Exchange of the electronics . . . . . . . . . . . . . . . . . . .

8 Dismounting

8.1 Dismounting steps . . . . . . . . . . . . . . . . . . . . . . . . . .

8.2 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 Supplement

9.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 LEVEL SWITCH 8111 • with NAMUR output

16
16
17

19
19
20

22
22
23

24
24

25
32

32048-EN-120418

Contents

Supplementary documentation
Information:

Supplementary documents appropriate to the ordered version come
with the delivery. You can find them listed in chapter "Product

description".

Instructions manuals for accessories and replacement parts
Tip:

To ensure reliable setup and operation of your LEVEL SWITCH 8111,
we offer accessories and replacement parts. The corresponding
documentations are:

l Operating instructions manual "Oscillator LEVEL SWITCH 8111/

8112"

Editing status: 2012-04-12

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 3

1 About this document

1 About this document

1.1 Function

This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important
instructions for maintenance and fault rectification. Please read this
information before putting the instrument into operation and keep this
manual accessible in the immediate vicinity of the device.

1.2 Target group

This operating instructions manual is directed to trained qualified
personnel. The contents of this manual should be made available to
these personnel and put into practice by them.

1.3 Symbolism used

Information, tip, note

This symbol indicates helpful additional information.

Caution: If this warning is ignored, faults or malfunctions can
result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.

Ex applications

This symbol indicates special instructions for Ex applications.

l List

The dot set in front indicates a list with no implied sequence.

à Act

1 Sequence

4 LEVEL SWITCH 8111 • with NAMUR output

ion

This arrow indicates a single action.

Numbers set in front indicate successive steps in a procedure.

32048-EN-120418

2 For your safety

2 For your safety

2.1 Authorised personnel

All operations described in this operating instructions manual must be
carried out only by trained specialist personnel authorised by the plant
operator.

During work on and with the device the required personal protective
equipment must always be worn.

2.2 Appropriate use

The LEVEL SWITCH 8111 is a sensor for level detection.

You can find detailed information on the application range in chapter

"Product description".

Operational reliability is ensured only if the instrument is properly used
according to the specifications in the operating instructions manual as
well as possible supplementary instructions.

For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbitrary
conversions or modifications are explicitly forbidden.

2.3 Warning about misuse

Inappropriate or incorrect use of the instrument can give rise to
application-specific hazards, e.g. vessel overfill or damage to system
components through incorrect mounting or adjustment.

2.4 General safety instructions

This is a high-tech instrument requiring the strict observance of
standard regulations and guidelines. The user must take note of the
safety instructions in this operating instructions manual, the country­specific installation standards as well as all prevailing safety
regulations and accident prevention rules.

The instrument must only be operated in a technically flawless and
reliable condition. The operator is responsible for trouble-free
operation of the instrument.

During the entire duration of use, the user is obliged to determine the
compliance of the necessary occupational safety measures with the
current valid rules and regulations and also take note of new
regulations.

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 5

2 For your safety

2.5 Safety label on the instrument

The safety approval markings and safety tips on the device must be
observed.

2.6 CE conformity

This device fulfills the legal requirements of the applicable EC
guidelines. By attaching the CE mark, we provide confirmation of
successful testing.

2.7 SIL conformity

LEVEL SWITCH 8111 fulfills the requirements to functional safety
according to IEC 61508 resp. IEC 61511. You find further information
in the Safety Manual "LEVEL SWITCH".

2.8 Safety instructions for Ex areas

Please note the Ex-specific safety information for installation and
operation in Ex areas. These safety instructions are part of the
operating instructions manual and come with the Ex-approved
instruments.

6 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

3 Product description

1

2

3

3.1 Structure

3 Product description

pe of delivery

Sco

Constit

uent parts

The scope of delivery encompasses:

l LEVEL SWITCH 8111 point level switch
l Documentation

- this operating instructions manual

- Safety Manual "Functional safety according to IEC 61508

resp. IEC 61511 (SIL)"

- Ex-specific "Safety instructions" (with Ex versions)

- if necessary, further certificates

The LEVEL SWITCH 8111 consists of the components:

l Housing cover
l Housing with electronics
l Process fitting with tuning fork

Fig. 1: LEVEL SWITCH 8111
1 Housing cover

2 Housing with electronics
3 Process fitting

Type

label

The type label contains the most important data for identification and
use of the instrument:

l Article number
l Serial number
l Technical data
l Article numbers, documentation

In addition to the type label outside on the instrument, you find the
serial number also inside the instrument.

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 7

3 Product description

3.2 Principle of operation

Appli

cation area

Func

tional principle

LEVEL SWITCH 8111 is a point level sensor with tuning fork for level
detection.

It is designed for industrial use in all areas of process technology and
can be used in liquids.

Typical applications are overfill and dry run protection. With a tuning
fork of only 40 mm length, LEVEL SWITCH 8111 can be also mounted
e.g. in pipelines from DN 32. The small tuning fork allows use in
vessels, tanks and pipes. Thanks to its simple and robust measuring
system, LEVEL SWITCH 8111 is virtually unaffected by the chemical
and physical properties of the liquid.

It functions even under difficult conditions such as turbulence, air
bubbles, foam generation, buildup, strong external vibration or
changing products.

Fault monitoring

The electronics module of LEVEL SWITCH 8111 continuously
monitors via frequency evaluation the following criteria:

l Strong corrosion or damage on the tuning fork
l Loss of vibration
l Line break to the piezo drive

If one of these faults is detected or if the power supply fails, the
electronics takes on a defined output status (safe condition).

The tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx. 1200 Hz. The piezos are
fixed mechanically and are hence not subject to temperature shock
limitations. The frequency changes when the tuning fork is covered by
the medium. This change is detected by the integrated electronics
module and converted into a switching command.

Volta

ge supply

LEVEL SWITCH 8111 is a compact instrument, i.e. it can be operated
without external evaluation system. The integrated electronics
evaluates the level signal and outputs a switching signal. With this
switching signal, a connected device can be operated directly (e.g. a
warning system, a pump etc.).

The data for power supply are specified in chapter "Technical data".

3.3 Operation

The switching condition of LEVEL SWITCH 8111 can be checked
when the housing is closed (signal lamp). With the basic setting,
products with a density > 0.7 g/cm³ (0.025 lbs/in³) can be detected.
The instrument can be adapted if products with lower density should
be measured.

On the electronics module you will find the following indicating and
adjustment elements:

8 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

3 Product description

l Signal lamp for indication of the switching condition (green/red)
l DIL switch for sensitivity adjustment
l Mode adjustment for selection of the switching condition (A/B)

3.4 Storage and transport

Packag

ing

Tr

ansport

Tr

ansport inspection

Stora

ge

Stora

ge and transport

temperature

Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
according to DIN EN 24180.

The packaging of standard instruments consists of environment­friendly, recyclable cardboard. The sensor is also equipped with a
protective cap of ABS. For special versions, PE foam or PE foil is also
used. Dispose of the packaging material via specialised recycling
companies.

Transport must be carried out under consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.

The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or
concealed defects must be appropriately dealt with.

Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.

Unless otherwise indicated, the packages must be stored only under
the following conditions:

l Not in the open
l Dry and dust free
l Not exposed to corrosive media
l Protected against solar radiation
l Avoiding mechanical shock and vibration

l Storage and transport temperature see chapter "Supplement -

Technical data - Ambient conditions"

l Relative humidity 20 … 85 %

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 9

4 Mounting

4 Mounting

4.1 General instructions

Suita

bility for the proc-

ess conditions

Swit

ching point

Make sure that all parts of the instrument exposed to the process, in
particular the sensor element, process seal and process fitting, are
suitable for the existing process conditions. These include above all
the process pressure, process temperature as well as the chemical
properties of the medium.

You can find the specifications in chapter "Technical data" and on the
type label.

In general, LEVEL SWITCH 8111 can be installed in any position. The
instrument only has to be mounted in such a way that the tuning fork is
at the height of the desired switching point.

The tuning fork has lateral markings (notches) that indicate the
switching point with vertical mounting. The switching point refers to
water with the basic setting of the sensitivity switch ≥ 0.7 g/cm³
(0.025 lbs/in³). When mounting LEVEL SWITCH 8111, make sure that
this marking is at the height of the requested switching point. Keep in
mind that the switching point of the instrument is shifted if the medium
has a density other than water - water 1 g/cm³ (0.036 lbs/in³). For
products < 0.7 g/cm³ (0.025 lbs/in³) and > 0.5 g/cm³ (0.018 lbs/in³) the
density switch must be set to ≥ 0.5 g/cm³.

10 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

2

3

1

4

Fig. 2: Installation vertical

1

1 Switching point approx. 13 mm (0.51 in)
2 Switching point with lower density
3 Switching point with higher density
4 Switching point approx. 27 mm (1.06 in)

4 Mounting

Fig. 3: Horizontal installation
1 Switching point

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 11

1

2

4 Mounting

Fig. 4: Horizontal installation (recommended mounting position, particularly for
adhesive products)

1 Switching point
2 Marking with screwed version on top, with flange versions directed to the

flange holes

With flange versions, the fork is directed as follows to the flange holes.

Fig. 5: Fork position with flange versions

Moisture

Use the recommended cables (see chapter "Connecting to power
supply") and tighten the cable gland.

You can give your instrument additional protection against moisture
penetration by leading the connection cable downward in front of the
cable entry. Rain and condensation water can thus drain off. This
applies mainly to outdoor mounting as well as installation in areas
where high humidity is expected (e.g. through cleaning processes) or
on cooled or heated vessels.

12 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

Fig. 6: Measures against moisture penetration

4 Mounting

ansport

Tr

Press

Handlin

Welde

ure/Vacuum

g

d socket

Caution:

Do not hold LEVEL SWITCH 8111 on the tuning fork. Particularly with

flange or tube versions, the tuning fork can be damaged just by the
weight of the instrument. Transport coated instruments very carefully
and avoid touching the tuning fork.

Remove the packaging or the protective cover just before installation.

The process fitting must be sealed if there is gauge or low pressure in

the vessel. Before use, check if the seal material is resistant against
the measured product and the process temperature.

The max. permissible pressure is specified in chapter "Technical data"
or on the type label of the sensor.

The vibrating level switch is a measuring instrument and must be
treated accordingly. Bending the vibrating element will destroy the
instrument.

Warning:

The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.

Use the hexagon above the thread for screwing in.

4.2 Instructions for installation

LEVEL SWITCH 8111 has a defined thread starting point. This means
that every LEVEL SWITCH 8111 is in the same fork position after
being screwed in. Remove therefore the supplied seal from the thread
of LEVEL SWITCH 8111. This seal is not required when using a
welded socket with O-ring in front.

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 13

1

4 Mounting

Keep in mind that this welded socket is not suitable for coated

instrument versions.

Screw LEVEL SWITCH 8111 completely into the welded socket. The
later position can be determined already before welding. Mark the
appropriate position of the welded socket. Before welding, unscrew
LEVEL SWITCH 8111 and remove the rubber ring from the welded
socket. The welded socket has a marking (notch). Weld the socket
with the notch facing upward, or in case of pipelines (DN 32 up to
DN 50), aligned with the direction of flow.

Fig. 7: Marking on the welded socket
1 Marking

Adhesiv

e products

In case of horizontal mounting in adhesive and viscous products, the
surfaces of the tuning fork should be vertical in order to reduce buildup
on the tuning fork. On the screwed version you will find a marking on
the hexagon. With this, you can check the position of the tuning fork
when screwing it in. When the hexagon touches the seal, the thread
can still be turned by approx. half a turn. This is sufficient to reach the
recommended installation position.

With flange versions, the fork is directed to the flange holes.

When used in adhesive and viscous products, the tuning fork should
protrude into the vessel to avoid buildup. For that reason, sockets for

flanges and mounting bosses should be avoided when mounting
horizontally.

Inflow

ing medium

If LEVEL SWITCH 8111 is mounted in the filling stream, unwanted
false measurement signals can be generated. For this reason, mount
LEVEL SWITCH 8111 at a position in the vessel where no
disturbances, e.g. from filling openings, agitators, etc., can occur.

Fl

ows

To minimise flow resistance caused by the tuning fork, LEVEL
SWITCH 8111 should be mounted in such a way that the surfaces of

the blades are parallel to the product movement.

14 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

4 Mounting

Enamel coating

Instruments with enamel coating should be treated very carefully and
shocks should be avoided. Unpack LEVEL SWITCH 8111 directly
before installation. Insert LEVEL SWITCH 8111 carefully into the
vessel opening and avoid touching any sharp vessel parts.

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 15

5 Connecting to power supply

5 Connecting to power supply

5.1 Preparing the connection

safety instructions

Note

Ta

ke note of the

safety instruc­tions for Ex ap­plications
Volta

ge supply

Conne

ction cable

Conne

ction ca-

ble for Ex appli­cations

Always keep in mind the following safety instructions:

l Connect only in the complete absence of line voltage

In hazardous areas you must take note of the respective regulations,
conformity and type approval certificates of the sensors and power
supply units.

Connect the operating voltage according to the following diagrams.
Take note of the general installation regulations. As a rule, connect
LEVEL SWITCH 8111 to vessel ground (PA), or in case of plastic

vessels, to the next ground potential. On the side of the instrument
housing there is a ground terminal between the cable entries. This
connection serves to drain off electrostatic charges. In Ex applications,
the installation regulations for hazardous areas must be given priority.

The data for power supply are specified in chapter "Technical data".

The instrument is connected with standard two-wire cable without

screen. If electromagnetic interference is expected which is above the
test values of EN 61326 for industrial areas, screened cable should be
used.

Use cable with round cross-section. A cable outerdiameterof 5 … 9 mm
(0.2 … 0.35 in) ensures the seal effect of the cable gland. If you are

using cable with a different diameter or cross-section, exchange the
seal or use a suitable cable gland.

In hazardous areas, only use approved cable connections for LEVEL
SWITCH 8111.

Take note of the corresponding installation regulations for Ex

applications.

Cover all housing openings conforming to standard according to
EN 60079-1.

5.2 Connection procedure

With Ex instruments, the housing cover may only be opened if there is
no explosive atmosphere present.

Proceed as follows:

1 Unscrew the housing cover
2 Loosen compression nut of the cable entry
3 Remove approx. 10 cm (4 in) of the cable mantle, strip approx.

1 cm (0.4 in) of insulation from the ends of the individual wires

4 Insert the cable into the sensor through the cable entry

16 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

N

N AM UR

( IE C 60 94 7- 5- 6 )

m ax .

m in .

S im ul .

+ -

0,5 g / cm

3

0,7 g / cm

3

3

6

5

7

1

2

4

nics and connec-

Electro
tion compartment

5 Connecting to power supply

5 Open the terminals with a screwdriver
6 Insert the wire ends into the open terminals according to the wiring

plan

7 Tighten the terminals with a screwdriver
8 Check the hold of the wires in the terminals by lightly pulling on

them

9 Tighten the compression nut of the cable entry. The seal ring must

completely encircle the cable

10 Screw the housing cover back on
The electrical connection is finished.

5.3 Wiring plan, single chamber housing

Fig. 8: Electronics and connection compartment, single chamber housing
1 Control lamp

2 DIL switch for characteristics reversal
3 DIL switch for sensitivity adjustment
4 Ground terminal
5 EMC filter element
6 Simulation key

ing plan

Wir

7 Connection terminals

For connection of the amplifier according to NAMUR (IEC 60947-5-6,
EN 50227). You can find further information in the " Technical data".

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 17

1 2

++-

-

5 Connecting to power supply

Fig. 9: Wiring plan, single chamber housing

18 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

6 Set up

1

5

2

3

4

6.1 General information

The figures in brackets refer to the following illustrations.

6 Set up

tion/Configuration

Func

The switching condition of the electronics can be checked with closed
housing cover (control lamp). In the basic setting, products with a
density > 0.7 g/cm³ (0.025 lbs/in³) can be detected. For products with
lower density, the switch must be set to > 0.5 g/cm³ (0.018 lbs/in³).

On the electronics module you will find the following indicating and
adjustment elements:

l Signal lamp (1)
l DIL switch for characteristics reversal - min./max. (2)
l DIL switch for sensitivity adjustment (3)
l Simulation key (4)

Note:

For test purposes, immerse the tuning fork of LEVEL SWITCH 8111
always in liquids. D o not test the function of LEVEL SWITCH 8111 with
your hand. This can damage the sensor.

6.2 Adjustment elements

Fig. 10: Oscillator SWE60N - NAMUR output
1 Signal lamp (LED)

2 DIL switch for characteristics reversal
3 DIL switch for sensitivity adjustment
4 Simulation key
5 EMC filter element

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 19

6 Set up

nal lamp (1)

Sig

Characte

ristics reversal

(2)

Sen

sitivity adjustment

(3)

Single-coloured control lamp for indication of the switching condition.

l red = High current ≥ 2.6 mA
l dark = Low current ≤ 0.6 mA
l red (flashing) = Failure ≤ 0.6 mA

The characteristics reversal can be carried out with the DIL switch.
You can choose between falling characteristic curve (switch position

max.) and rising characteristic curve (switch position min.). This allows
you to output the desired current.

Modes

l min. - rising characteristic curve (High current when immersed)
l max. - falling characteristics (Low current when immersed)

The NAMUR output can be switched over to falling or rising
characteristics (see also "Function chart").

For applications according to WHG, the DIL switch must be set to
position max.

With this DIL switch (3) you can set the switching point to liquids
having a density between 0.5 and 0.7 g/cm³ (0.018 and 0.025 lbs/in³).
With the basic setting, liquids with a density of > 0.7 g/cm³ (0.025 lbs/
in³) can be detected. In liquids with lower density, you must set the
switch to > 0.5 g/cm³ (0.018 lbs/in³). The specifications for the position
of the switching point relate to water - density value 1 g/cm³ (0.036 lbs/
in³). In products with a different density, the switching point will shift in
the direction of the housing or tuning fork end depending on the
density and type of installation.

Note:

Keep in mind that foams with a density > 0.45 g/cm³ (0.016 lbs/in³) a re
detected by the sensor. This can cause faulty switchings particulary
when used as dry run protection system.

Sim

ulation key (4)

The simulation key is located in a recess on the upper side of the
electronics module. Push the simulation key with a suitable object
(screwdriver, pen, etc.).

When the key is pushed, a line break between sensor and processing
unit is simulated. The signal lamp on the sensor extinguishes. The
measuring system must signal a fault and take on a safe condition
when the key is pushed.

Keep in mind that downstream connected instruments will be activated
during operation. This allows you to check the correct function of the
measuring system.

6.3 Function chart

The following chart provides an overview of the switching conditions
depending on the adjusted mode and level.

20 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

6 Set up

Note:

The mode setting on the NAMUR amplifier must be selected in such a
way that the switching output takes on safe condition in case of failure
(I ≤ 0.6 mA).

Level Signal current -

Falling characteris­tics max.

Falling characteris­tics max.

Rising characteris­tics min.

Rising characteris­tics min.

Malfunction any ≤ 0.6 mA

Sensor

≥ 2.6 mA

≤ 0.6 mA

≥ 2.6 mA

≤ 0.6 mA

Control lamp

flashes

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 21

7 Maintenance and fault rectification

7 Maintenance and fault rectification

7.1 Maintenance

If the instrument is used properly, no special maintenance is required
in normal operation.

7.2 Remove interferences

ction when malfunc-

Rea
tions occur

Fa

ilure reasons

Fa

ult rectification

Checkin

g the switching

signal

The operator of the system is responsible for taking suitable measures
to rectify faults.

LEVEL SWITCH 8111 offers maximum reliability. Nevertheless, faults
can occur during operation. These may be caused by the following, e.
g.:

l Sensor
l Process
l Voltage supply
l Signal processing

The first measure to be taken is to check the output signal. In many
cases, the causes can be determined this way and the faults rectified.

Error Cause Rectification

L

LEVE
SWITCH 8111

signals "covered"
without being
submerged (over­fill protection)

LEVEL
SWITCH 8111

signals "uncov­ered" when being
submerged (dry
run protection)

Operating voltage
too low

Electronics de­fective

Unfavourable in­stallation location

Buildup on the vi­brating element

Check operating voltage

Press the characteristic reversal

switch. If the instrument then changes
the mode, the vibrating element may
be covered with buildup or mechan­ically damaged. Should the switching
function in the correct mode still be
faulty, return the instrument for repair.

Push the characteristic reversal
switch. If the instrument then does not
change the mode, the electronics
module may be defective. Exchange
the electronics module.

Mount the instrument at a location in
the vessel where no dead zones or air
bubbles can form.

Check the vibrating element and the
sensor if there is buildup and remove
it.

32048-EN-120418

22 LEVEL SWITCH 8111 • with NAMUR output

7 Maintenance and fault rectification

Error Cause Rectification

Signal lamp

flashes red

Wrong character­istic selected

Error on the vi­brating element

Interference on
the electronics
module

instrument defec­tive

Set the correct characteristics on the
characteristics reversal switch (over­flow protection, dry run protection).
Wiring should be carried out accord­ing to the quiescent current principle.

Check if the vibrating element is
damage or extremely corroded.

Exchanging the electronics module

Exchange the instrument or send it in

for repair

ction after fault rec-

Rea
tification

ing on the reason for the fault and the measures taken, the

Depend
steps described in chapter "Set up" may have to be carried out again.

7.3 Exchange of the electronics

If the electronics module is defective, it can be replaced by the user.

In Ex applications only an electronics module with respective Ex

approval may be used.

You find all information to the electronics exchange in t he operating
instructions of the new electronics module.

In general, all electronics modules of series SW60 can be inter-
changed. If you want to use an electronics module with a different
signal output, you carry out the complete setup. You find the
necessary, suitable operating instruction on our homepage.

Note:

Keep in mind that enamelled instrument versions need special
electronics modules. These electronics modules are called SW60E or

SW60E1.

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 23

8 Dismounting

8 Dismounting

8.1 Dismounting steps

Warning:

Before dismounting, be aware of dangerous process conditions such
as e.g. pressure in the vessel, high temperatures, corrosive or toxic
products etc.

Take note of chapters "Mounting" and "Connecting to power supply"
and carry out the listed steps in reverse order.

With Ex instruments, the housing cover may only be opened if there is
no explosive atmosphere present.

8.2 Disposal

The instrument consists of materials which can be recycled by
specialised recycling companies. We use recyclable materials and
have designed the electronics to be easily separable.

WEEE directive 2002/96/EG

This instrument is not subject to the WEEE directive 2002/96/EG and
the respective national laws. Pass the instrument directly on to a
specialised recycling company and do not use the municipal collecting
points. These may be used only for privately used products according
to the WEEE directive.

Correct disposal avoids negative effects on humans and the environ­ment and ensures recycling of useful raw materials.

Materials: see chapter "Technical data"

If you have no way to dispose of the old instrument properly, please

contact us concerning return and disposal.

24 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

9 Supplement

9 Supplement

9.1 Technical data

General data

Material 316L corresponds to 1.4404 or 1.4435
Materials, wetted parts

- Process fitting - thread 316L, Hastelloy C22 (2.4602)

- Process fitting - flange 316L, 316L with Hastelloy C22 coating, steel

- Process seal Klingersil C-4400

- Tuning fork 316L, Hastelloy C22 (2.4602)

Sensor length

- Length LEVEL SWITCH 8111 See chapter "Dimensions"
Materials, non-wetted parts

- Housing plastic PBT (Polyester)

- Seal between housing and housing

cover

- Ground terminal 316L

- Temperature adapter (optional) 316L

- Gas-tight leadthrough (optional) 316L/glass

Weight

- Plastic housing approx. 850 g (30 oz)
Layer thickness

- Enamel approx. 0.8 mm (0.031 in)

- ECTFE approx. 0.5 mm (0.02 in)

- PFA approx. 0.5 mm (0.02 in)

Surface quality

- Standard R

- Hygienic version (3A) Ra< 0.8 µm (3.15-5in)

- Hygienic version (3A) R

Process fittings

- Pipe thread, cylindrical (DIN 3852-A) G¾ A, G1 A

- American pipe thread, conical

(ASME B1.20.1)

- Flanges DIN from DN 25, ANSI from 1"

- hygienic fittings Bolting DN 40 PN 40, Clamp 1" DIN 32676

Max. torque - process fitting

enamelled, 316L with ECTFE coating, 316L with

PFA coating

EPDM

approx. 3 µm (1.18-4in)

a

< 0.3 µm (1.18-5in)

a

¾ NPT or 1 NPT

ISO 2852/316L, Clamp 1½" PN 10 DIN 32676
ISO 2852/316L, conus DN 25 PN 40, Tuchenhagen
Varivent DN 50 PN 10

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 25

9 Supplement

- Thread G¾ A, ¾ NPT 75 Nm (55 lbf ft)

- Thread G1 A, 1 NPT 100 Nm (73 lbf ft)

High voltage test (enamel) max. 5 KV
Gas-tight leadthrough (optional)

- Leakage rate < 10

-6

mbar l/s

- Pressure resistance PN 64

Output variable

Output Two-wire NAMUR output
Current consumption

- Falling characteristics ≥ 2.6 mA uncovered/≤ 0.6 mA covered

- rising characteristics ≤ 0.6 mA uncovered/≥ 2.6 mA covered

- Fault message ≤ 0.6 mA

Necessary processing system NAMUR processing system according to

IEC 60947-5-6 (EN 50227/DIN 19234)

Modes (NAMUR output adjustable to falling or rising characteristics)

- Min. rising characteristic curve (High current when

immersed)

- Max. falling characteristics (Low current when immersed)

Measuring accuracy

Deviation ± 1 mm (0.04 in)

26 LEVEL SWITCH 8111 • with NAMUR output

32048-EN-120418

Influence of the process temperature on the switching point

1

3

4

2

10 (

25

/

64

")

8

(

5

/

1

6

")

6

(

15

/

6

4

")

4

(

5

/

3

2

")

2 (

5

/

64

")

-2

(

-5

/

6

4

")

-4

(

-5

/

32

")

-6 (

-15

/

64

")

-8

(

-5

/

16

")

-10

(

-25

/

64

")

0

0°C

(32 °F)

100°C

(212 °F)

150°C

(302 °F)

200°C

(392 °F)

250°C

(482 °F)

50°C

(122 °F)

1

2

4

3

5

6

1,2

(0,043)

1

(0,036)

0,8

(0,029)

0,6

(0,022)

1,4

(0,051)

1,6

(0,058)

1,8

(0,065)

2

(0,072)

2,2

(0,079)

2,4

(0,087)

10 (

25

/

64

")

8

(

5

/

1

6

")

6

(

15

/

64

")

4 (

5

/

3

2

")

2

(

5

/

64

")

-2

(

-5

/

64

")

-4

(

-5

/

3

2

")

-6

(

-15

/

64

")

-8

(

-5

/

16

")

-10

(

-25

/

64

")

0

Fig. 20: Influence of the process temperature on the switching point
1 Shifting of the switching point in mm (in)

2 Process temperature in °C (°F)
3 Switching point at reference conditions (notch)
4 Tuning fork

Influence of the product density on the switching point

9 Supplement

Fig. 21: Influence of the product density on the switching point
1 Shifting of the switching point in mm (in)

2 Product density in g/cm³ (lb/in³)
3 Switch position 0.5 g/cm³ (0.018 lb/in³)
4 Switch position 0.7 g/cm³ (0.025 lb/in³)
5 Switching point at reference conditions (notch)
6 Tuning fork

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 27

1

2

3

4

12

(174,1)

38

(551,1)

25

(362,6)

51

(739,7)

64

(928,2)

10 (

25

/

64

")

8

(

5

/

16

")

6

(

15

/

6

4

")

4 (

5

/

3

2

")

2

(

5

/

64

")

-2

(

-5

/

64

")

-4

(

-5

/

3

2

")

-6

(

-15

/

64

")

-8

(

-5

/

16

")

-10

(

-25

/

64

")

0

9 Supplement

Influence of the process pressure to the switching point

Fig. 22: Influence of the process pressure to the switching point
1 Shifting of the switching point in mm (in)

2 Process pressure in bar (psig)
3 Switching point at reference conditions (notch)
4 Tuning fork

Repeatability 0.1 mm (0.004 in)
Hysteresis approx. 2 mm (0.08 in) with vertical installation
Switching delay approx. 500 ms (on/off)
Frequency approx. 1200 Hz

Ambient conditions

Ambient temperature on the housing -40 … +70 °C (-40 … +158 °F)
Storage and transport temperature -40 … +80 °C (-40 … +176 °F)

Process conditions

Measured variable Limit level of liquids
Process pressure -1 … 64 bar/-100 … 6400 kPa (-14.5 … 928 psig)

Process temperature (thread or flange tem-

perature)

- LEVEL SWITCH 8111 of 316L/Hastelloy
C22 (2.4602)

Process temperature (thread or flange tem-

perature) with temperature adapter (option)

- LEVEL SWITCH 8111 of 316L/Hastelloy
C22 (2.4602)

28 LEVEL SWITCH 8111 • with NAMUR output

depending on the process fitting, e.g. flange (see
following diagrams)

-50 … +150 °C (-58 … +302 °F)

-50 … +250 °C (-58 … +482 °F)

32048-EN-120418

- LEVEL SWITCH 8111 enamelled -50 … +200 °C (-58 … +392 °F)

200 °C

(392 °F)

250 °C

(482 °F)

-50 °C

(-58 °F)

-40 °C

(-40 °F)

0 °C

(32 °F)

40 °C

(104 °F)

70 °C

(158 °F)

50 °C

(122 °F)

100 °C

(212 °F)

150 °C

(302 °F)

1

2

3

1

2

-50 °C

(-58 °F)

0°C

(32 °F)

50°C

(122 °F)

100°C

(212 °F)

150°C

(302 °F)

200°C

(392 °F)

250°C

(482 °F)

20

(290)

-1 (-14,5)

40

(580)

64

(928)

- LEVEL SWITCH 8111 with ECTFE

-50 … +150 °C (-58 … +302 °F)

coating

- LEVEL SWITCH 8111 with PFA coating -50 … +150 °C (-58 … +302 °F)

Fig. 23: Ambient temperature - Process temperature
1 Process temperature in °C (°F)

2 Ambient temperature in °C (°F)
3 Temperature range with temperature adapter

9 Supplement

Fig. 24: Process temperature - Process pressure with switch position 0.7 g/cm³ (sensitivity switch)
1 Process pressure in bar (psig)

2 Process temperature in °C (°F)

32048-EN-120418

LEVEL SWITCH 8111 • with NAMUR output 29

1

2

-50 °C

(-58 °F)

0°C

(32 °F)

50°C

(122 °F)

100°C
(212 °F)

150°C

(302 °F)

200°C

(392 °F)

250°C

(482 °F)

20

(290)

-1 (-14,5)

40

(580)

64

(928)

9 Supplement

Fig. 25: Process temperature - Process pressure with switch position 0.5 g/cm³ (sensitivity switch)
1 Process pressure in bar (psig)

2 Process temperature in °C (°F)

Viscosity - dynamic 0.1 … 10,000 mPa s (requirement: with density 1)
Flow velocity max. 6 m/s (with a viscosity of 1 mPa s)
Density 0.7 … 2.5 g/cm³ (0.025 … 0.09 lbs/in³); 0.5 … 2.5 g/

cm³ (0.018 … 0.09 lbs/in³) by switching over

Electrical protective measures

Protection rating IP 66/IP 67
Overvoltage category III
Protection class II

Adjustment elements

Mode switch

- Min. rising characteristic curve (High current when

immersed)

- Max. falling characteristics (Low current when immersed)

Sensitivity switch

- 0.5 0.5 … 2.5 g/cm³ (0.018 … 0.9 oz/in³)

- 0.7 0.7 … 2.5 g/cm³ (0.025 … 0.9 oz/in³)

Test key simulation of a line break between sensor and

processing unit

Voltage supply

Operating voltage (characteristics according
to standard)

Off-load voltage U
Shortcircuit current I

30 LEVEL SWITCH 8111 • with NAMUR output

for connection to an amplifier according to NAMUR
IEC 60947-5-6, approx. 8.2 V

approx. 8.2 V

0

approx. 8.2 mA

U

32048-EN-120418