KROHNE OPTISOUND 3020 C Operating Manual

Operating Instructions

OPTISOUND 3020 C
4 ... 20 mA/HART - four-wire

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 CE conformity .........................

2.6 Compatibility acc. to NAMUR NE 53 .........

2.7 Safety information for Ex areas.............

3 Product description

3.1 Configuration..........................

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

3.3 Adjustment ...........................

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

4 Mounting

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

4.2 Mounting information ....................

5
5
5

6
6
6
6
6
6
7

8
9
9
9

11
13

5 Connecting to power supply

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

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

5.3 Wiring plans, double chamber housing .......

5.4 Switch on phase .......................

6 Setup with the indicating/adjustment module

6.1 Short description .......................

6.2 Installation of the indicating/adjustment module .

6.3 Adjustment system .....................

6.4 Setup procedure .......................

6.5 Menu schematic .......................

7 Maintenance and fault rectification

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

7.2 Fault rectification .......................

7.3 Exchanging the electronics................

7.4 Instrument repair .......................

2 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

19
20
21
23

24
24
26
27
31

34
34
35
36

30508-EN-050914

8 Dismounting

8.1 Dismounting procedure ..................

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

9 Supplement

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

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

9.3 Certificate ............................

Contents

37
37

38
42
43

Supplementary operating instructions manuals

Information:

OPTISOUND 3020 C is available in different versions and is
supplied specifically acc. to the order. Depending on the
selected version, supplementary operating instructions man­uals come with the shipment. The supplementary operating
instructions are stated in paragraph "3. Product description".

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 3

About this document

1 About this document

1.1 Function

This operating instructions manual has all the information you
need for quick setup and safe operation of OPTISOUND 3020
C. Please read this manual before you start setup.

1.2 Target group

This operating instructions manual is directed to trained
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, warning, danger

This symbol informs you of a dangerous situation that could
occur. Ignoring this cautionary note can impair the person and/
or the instrument.

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 Action

This arrow indicates a single action.

1 Sequence

Numbers set in front indicate successive steps in a procedure.

4 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

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, specialised personnel
authorised by the operator. For safety and warranty reasons,
any internal work on the instruments must be carried out only
by personnel authorised by the manufacturer.

2.2 Appropriate use

OPTISOUND 3020 C is a sensor for continuous level
measurement.

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

OPTISOUND 3020 C 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 country-specific installation standards
(e.g. the VDE regulations in Germany) as well as all prevailing
safety regulations and accident prevention rules.

2.5 CE conformity

OPTISOUND 3020 C is in CE conformity with EMC (89/336/
EWG), fulfils the NAMUR recommendation NE 21 and is in CE
conformity with LVD (73/23/EWG).

Conformity has been judged acc. to the following standards:

l EMC:

- Emission EN 61326: 1997 (class A)

- Susceptibility EN 61326: 1997/A1: 1998

l LVD: EN 61010-1: 2001

2.6 Compatibility acc. to NAMUR NE 53

OPTISOUND 3020 C meets NAMUR recommendation NE 53.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 5

For your safety

The parameter adjustment of the basic sensor functions is

independent of the software version. The range of available
functions depends on the respective software version of the
individual components.

The software version of OPTISOUND 3020 C can be
determined as follows:

l on the type label of the electronics
l via the indicating/adjustment module.

You can find all software histories on our website www.krohne.
com.

2.7 Safety information 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 Ex­approved instruments.

6 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

3 Product description

3.1 Configuration

Product description

Scope of delivery

Components

The scope of delivery encompasses:

l OPTISOUND 3020 C ultrasonic sensor
l Documentation

- this operating instructions manual

- Ex-specific safety instructions (with Ex versions) and, if

necessary, further certificates

- Operating instructions manual "Indicating and adjust-
ment module" - optional

OPTISOUND 3020 C consists of the following components:

l Process fitting with transducer
l Housing with electronics
l Housing cover, optionally available with indicating/adjust-

ment module

The components are available in different versions.

1

2

3

Fig. 1: OPTISOUND 3020 C, version with plastic housing
1 Housing cover, optionally available with indicating/adjustment module
2 Housing with electronics
3 Process fitting with transducer

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 7

Product description

3.2 Principle of operation

Area of application

Physical principle

Power supply

OPTISOUND 3020 C is an ultrasonic sensor for continuous
level measurement. It is suitable for liquids and solids in
virtually all industries, particularly in water and waste water
management.

The transducer of the ultrasonic sensor emits short ultrasonic
pulses to the measured product. These pulses are reflected by
the product surface and received by the transducer as echoes.
The running time of the ultrasonic pulses from emission to
reception is proportional to the distance and hence to the level.
The determined level is converted into an appropriate output
signal and outputted as measured value.

Four-wire electronics with separate power supply.

The power supply range can differ depending on the instru-

ment version. The exact range is stated in the "Technical data"
in the "Supplement".

Measured value transmission is carried out via the 4 ... 20 mA/
HART output, which is separated from the power supply.

3.3 Adjustment

OPTISOUND 3020 C can be adjusted with two different
adjustment media:

l the indicating/adjustment module
l a HART handheld

The entered parameters are generally saved in OPTISOUND
3020 C, optionally also in the indicating/adjustment module.

3.4 Storage and transport

Packaging

Storage and transport tem-

perature

8 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

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

The packaging of standard instruments consists of environ-

ment-friendly, recyclable cardboard. For special versions, PE
foam or PE foil is also used. Dispose of the packaging material
via specialised recycling companies.

l Storage and transport temperature see "Supplement –

Technical data – Ambient conditions"

30508-EN-050914

l Relative humidity 20 … 85 %

Product description

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 9

Mounting

4 Mounting

4.1 General instructions

Installation position

Moisture

Select an installation position you can easily reach for
mounting and connecting as well as later retrofitting of an
indicating and adjustment module. The housing can be rotated
by 330° without the use of any tools. You can also install the
indicating and adjustment module in four different positions
(each displaced by 90°).

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

You can give your OPTISOUND 3020 C 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 mounting
outdoors, in areas where moisture is expected (e.g. by
cleaning processes) or on cooled or heated vessels.

Fig. 2: Measures against moisture penetration

Measuring range

The reference plane for the measuring range is the lower edge
of the transducer.

Make sure that the min. distance, corresponding to the so
called dead band, is maintained below the reference plane ­measurement is not possible in this areas. The exact value of
the dead band is stated in chapter "Technical data" in the
Supplement.

10 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Mounting

2

1

Fig. 3: Min. distance to the max. level
1 Dead zone
2 Reference plane

Information:

If the product reaches the transducer, buildup can form on it
over a period of time and later cause measurement errors.

132

100%

0%

Fig. 4: Measuring range (operating range) and max. measuring distance
1 full
2 empty (max. measuring distance)
3 Measuring range

Pressure/Vacuum

Gauge pressure in the vessel does not influence OPTISOUND

3020 C. Low pressure or vacuum, however, damp the
ultrasonic pulses. This influences the measuring result,
particularly if the level is very low. With pressures under -

0.2 bar (-20 kPa) you should use a different measuring
principle, e.g. radar or guided microwave.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 11

Mounting

4.2 Mounting information

Screwing in

Installation position

Screw OPTISOUND 3020 C into the mounting socket with an
appropriate spanner applied to the hexagon of the process
fitting. Max. torque see chapter "Technical data".

Warning:

The housing must not be used to screw the instrument in!
Applying tightening force to the housing can damage its

internal mechanical components.

When mounting OPTISOUND 3020 C, keep a distance of at
least 200 mm (7.9 in) to the vessel wall. If the sensor is
installed in the center of dished or rounded vessel tops,
multiple echoes can arise. These can, however, be faded out
by an appropriate adjustment (see chapter "Setup").

If this distance cannot be maintained, a false echo storage
should be carried out during setup. This applies particularly if
buildup on the vessel wall is expected. In this case, we
recommend repeating the false echo storage later on with
existing buildup.

2

1

> 200 mm

Fig. 5: Mounting on dished vessel tops
1 Reference plane
2 Vessel center or symmetry axis

In vessels with conical bottom it can be advantageous to
mount the sensor in the center of the vessel, as measurement
is then possible down to the lowest point of the vessel bottom.

12 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Fig. 6: Vessel with conical bottom

Mounting

Socket

The mounting socket should preferably be dimensioned to
allow the lower edge of the transducer to protrude at least 10
mm out of the socket.

ca. 10 mm

Fig. 7: Recommended socket mounting

If the reflective properties of the medium are good, you can
mount OPTISOUND 3020 C on sockets higher than the
transducer length. You will find recommended values for
socket heights in the following illustration. The socket end
should be smooth and burr-free, if possible also rounded.
Carry out a false echo storage.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 13

Mounting

Sensor orientation

d

100 mm/4"

h

> 10 mm

150 mm/6"

h

300 mm/12"
400 mm/16"

d

Fig. 8: Deviating socket dimensions

In liquids, direct the sensor as perpendicular as possible to the
product surface to achieve optimum measurement results.

Fig. 9: Orientation in liquids

To reduce the min. distance to the medium, you can also
mount OPTISOUND 3020 C with a beam deflector. By doing
this, it is possible to fill the vessel nearly to maximum. This
arrangement is particularly suitable for open vessels such as e.
g. overflow basins.

~400x400

°

45

~200

Fig. 10: Beam deflector

14 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Mounting

Vessel installations

The ultrasonic sensor should be installed at a location where
no installations cross the ultrasonic beam.

Vessel installations such as for example, ladders, limit
switches, heating spirals, struts etc. can cause false echoes
superimposed on the useful echo. Make sure when planning
your measuring site that the ultrasonic signals have "free
access" to the measured product.

If there are existing vessel installations, a false echo storage
should be carried out during setup.

If large vessel installations such as struts or supports cause
false echoes, these can be attenuated through supplementary
measures. Small, inclined sheet metal or plastic baffles above
the installations scatter the ultrasonic signals and avoid direct
false echoes.

Fig. 11: Cover smooth profiles with deflectors

Agitators

If there are agitators in the vessel, a false echo storage should
be carried out with the agitators in motion. This ensures that
the interfering reflections from the agitators are saved with the
blades in different positions.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 15

Mounting

Fig. 12: Agitators

Inflowing material

Foam

Do not mount the instruments in or above the filling stream.
Make sure that you detect the product surface and not the

inflowing product.

Fig. 13: Inflowing liquid

Through the action of filling, stirring and other processes in the
vessel, dense foams which considerably damp the emitted
signals may form on the product surface.

If foams are causing measurement errors, the sensor should
be used in a standpipe or, alternatively, the more suitable
guided radar sensors (TDR) should be used.

30508-EN-050914

16 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

Mounting

Guided radar is not influenced by foam generation and is

particularly suitable for such applications.

Air flow

Standpipe measurement

If there are strong air currents in the vessel, e.g. due to strong
winds in outdoor installations, or because of air turbulence, e.
g. through cyclone exhausting, you should mount OPTI-
SOUND 3020 C in a standpipe or use a different measuring
principle, e.g. radar or guided radar (TDR).

By using a standpipe (surge or bypass tube), the influence of
vessel installations, foam generation and turbulence is
excluded.

Standpipes must extend all the way down to the requested
min. level, as measurement is only possible within the tube.

max.

1

min.

Fig. 14: Standpipe in a tank
1 Vent hole ø 5 … 10 mm

OPTISOUND 3020 C can be used from tube diameters of
50 mm.

Avoid large gaps and thick welding joints when connecting the
tubes. Generally carry out a false echo storage.

Measurement in a standpipe is not recommended for very
adhesive products.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 17

Connecting to power supply

5 Connecting to power supply

5.1 Preparing the connection

Note safety instructions

Take note of safety

instructions for Ex
applications

Select power supply

Selecting the connection ca-

ble

Always observe the following safety instructions:

l Connect only in the complete absence of line voltage
l If overvoltages are expected, overvoltage arresters should

be installed.

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

Power supply and current output are transmitted via separate
two-wire connection cables. The power supply range can differ
depending on the instrument version. The exact range is
stated in the "Technical data" in the Supplement.

The standard version can be operated with an earth­connected current output, the Exd version must be operated
with a floating output.

This instrument is designed in protection class I. To maintain
this protection class, it is absolutely necessary that the ground
conductor be connected to the internal ground terminal. Take
note of the general installation regulations.

As a rule, connect OPTISOUND 3020 C to vessel ground
(potential equalisation), or in case of plastic vessels, to the

next ground potential. There is a ground terminal on the side of
the instrument housing.

For power supply, an approved installation cable with PE
conductor is necessary.

The 4 ... 20 mA current output is connected with standard two­wire cable without screen. An outer cable diameter of 5 ...
9 mm ensures the seal effect of the cable entry. If electro­magnetic interference is expected, we recommend the use of
screened cable.

Cable screening and ground­ing

Connect the cable screen on both ends to ground potential. In
the sensor, the screen must be connected directly to the
internal ground terminal. The ground terminal outside on the
housing must be connected to the potential equalisation (low
impedance).

18 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Connecting to power supply

If potential equalisation currents are expected, the connection

on the evaluation side must be made via a ceramic capacitor
(e.g. 1 nF, 1500 V). The low frequency potential equalisation
currents are thus suppressed, but the protective effect against
high frequency interference signals remains.

Select connection
cable for Ex applica-
tions

Take note of the corresponding installation regulations for Ex
applications. In particular, make sure that no potential equal­isation currents flow over the cable screen. In case of
grounding on both sides this can be achieved by the use of a
capacitor or a separate potential equalisation.

5.2 Connection procedure

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 (current

output), strip approx. 1 cm (0.4 in) insulation from the ends
of the individual wires

4 Insert the cable into the sensor through the cable entry

5 Lift the opening levers of the terminals with a screwdriver

6 Insert the wire ends into the open terminals according to

the wiring plan

7 Press down the opening levers of the terminals, you will

hear the terminal spring closing

8 Check the hold of the wires in the terminals by lightly

pulling on them

9 Connect the screen to the internal ground terminal and the

external ground terminal to potential equalisation

10 Tighten the compression nut of the cable entry, the seal

ring must completely encircle the cable

11 Connect the lead cable for power supply in the same way

acc. to the wiring plan, in addition connect the ground
conductor to the inner ground terminal.

12 Screw the housing cover back on

The electrical connection is finished.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 19

Connecting to power supply

Housing overview

Fig. 15: Connection steps 5 and 6

5.3 Wiring plans, double chamber housing

1 2 3

4

Fig. 16: Double chamber housing
1 Housing cover, connection compartment
2 Blind stopper
3 Housing cover, electronics compartment
4 Filter element for pressure compensation
5 Cable gland

5

20 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Electronics compartment

Connecting to power supply

Connection compartment

Display

I2C

12 5678

Fig. 17: Electronics compartment, double chamber housing
1 Internal connection cable to the connection compartment

Display

1

12

I2C

1

2

Fig. 18: Connection compartment, double chamber housing
1 Spring-loaded terminals for power supply
2 Ground terminal for connection of the cable screen

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 21

3

Connecting to power supply

Wiring plan

Switch on phase

L1 N

12

/ L

1 2

/ N
PE

Fig. 19: Wiring plan, double chamber housing
1 Supply voltage
2 Signal output

4...20mA IS
GND

4 ... 20 mA

5.4 Switch on phase

After OPTISOUND 3020 C is connected to power supply, the
instrument carries out a self-test for approx. 30 seconds. The
following steps are carried out:

l Internal check of the electronics
l Indication of the instrument type, the firmware version as

well as the sensor TAGs (sensor name)

l Output signal jumps briefly (approx. 10 seconds) to the set

fault current

Then the actual measured value is displayed and the
corresponding current is transmitted to the cable.

1)

1)

The values correspond to the actual level as well as to the settings already
carried out, e.g. default setting.

22 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Setup with the indicating/adjustment module

6 Setup with the indicating/adjustment

module

6.1 Short description

The indicating/adjustment module is used for measured value
display, adjustment and diagnosis. It can be mounted in all
sensors of the OPTISOUND instrument family, in the single as
well as double chamber housing (optionally in the electronics
or connection compartment).

6.2 Installation of the indicating/adjustment

module

The indicating/adjustment module can be inserted or removed
at any time. It is not necessary to interrupt the power supply.

To mount, proceed as follows:

1 Unscrew the housing cover

2 Place the indicating/adjustment module in the desired

position on the electronics (you can choose any one of four
different positions - each displaced by 90°)

3 Press the indicating and adjustment module onto the

electronics and turn it to the right until it snaps in.

4 Screw housing cover with inspection window tightly back

on

Removal is carried out in reverse order.

The indicating/adjustment module is powered by the sensor,

an additional connection is not necessary.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 23

Setup with the indicating/adjustment module

Fig. 20: Installation of the indicating/adjustment module

Note:

If you intend to retrofit OPTISOUND 3020 C with an indicating/
adjustment module for continuous measured value indication,
a higher cover with an inspection glass is required.

24 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Setup with the indicating/adjustment module

6.3 Adjustment system

Key functions

Adjustment system

1

1.1

2

3

Fig. 21: Indicating and adjustment elements
1 LC display
2 Indication of the menu item number
3 Adjustment keys

l [OK] key:

- move to the menu overview

- confirm selected menu

- edit parameter

- save value

l [–>] key to select:

- menu change

- list entry

- editing position

l [+] key:

- modify value of a parameter

l [ESC] key:

- interrupt input

- jump to the next higher menu

The sensor is adjusted via the four keys of the indicating and
adjustment module. The LC display indicates the individual
menu items. The functions of the individual keys are shown in
the above illustration. Approx. 10 minutes after the last
pressing of a key, an automatic reset to measured value
indication is triggered. Any values not confirmed with [OK] will
not be saved.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 25

Setup with the indicating/adjustment module

6.4 Setup procedure

Address setting HART-Multi-

drop

Parameter adjustment

In HART-Multidrop mode (several sensors on one input) the
address must be set before continuing with the parameter
adjustment. You will find a detailed description in the operating
instructions manual of the indicating/adjustment module.

HART mode

Standard

Address 0

Because OPTISOUND 3020 C is a distance measuring
instrument, its primary task is to measure the distance from the
sensor to the product surface. In order to indicate the actual
filling level, the measured distance must be allocated to a
specific height percentage. To make this adjustment, the full
and empty distances in the vessel are entered. If these values
are not known, it is also possible to carry out the adjustment
with other distances, e.g. 10 % and 90 %. The origin of these
distance values is always the lower edge of the flange (with
flange versions) or the lower edge of the transducer (all other
versions).

The actual level is then calculated on the basis of these
entered values. At the same time, the operating range of the
sensor is limited from maximum range to the requested range.

The real product level during this adjustment is not important,
because the min./max. adjustment is always carried out
without changing the product level. These settings can be
made ahead of time without the instrument having to be
installed.

In the main menu item "Basic adjustment", the individual
submenu items should be selected one after the other and
provided with the correct parameter values.

Start your parameter adjustment with the following menu items
of the basic adjustment:

Carrying out min. adjustment

Proceed as follows:

1

Move from the measured value display to the main menu
by pushing [OK].

26 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Setup with the indicating/adjustment module

▶

Basic adjustment
Display
Diagnostics
Service
Info

2 Select the menu item "Basic adjustment" with [–>] and

confirm with [OK]. Now the menu item "Min. adjustment" is
displayed.

Min. adjustment

0.00 %

=

5.000 m(d)

4.000 m(d)

3 Prepare the % value for editing with [OK] and set the

cursor to the requested position with [–>]. Set the
requested percentage value with [+] and save with [OK].
The cursor jumps now to the distance value.

4 Enter the appropriate distance value in m (corresponding

to the percentage value) for the empty vessel (e.g. distance
from the sensor to the vessel bottom).

5 Save the settings with [OK] and move to "Max. adjustment"

with [–>].

Carrying out max. adjustment

Proceed as follows:

Max. adjustment

100.00 %

=

1.000 m(d)

2.000 m(d)

1 Prepare the % value for editing with [OK] and set the

cursor to the requested position with [–>]. Set the
requested percentage value with [+] and save with [OK].
The cursor jumps now to the distance value.

2 Enter the appropriate distance value in m (corresponding

to the percentage value) for the full vessel. Keep in mind
that the max. level must lie below the dead band.

3 Save the settings with [OK] and move to "Medium

selection" with [–>].

Medium selection

Each product has different reflective properties. In addition,
there are various interfering factors which have to be taken into
account: agitated product surfaces and foam generation (with
liquids); dust generation, material cones and echoes from the

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 27

Setup with the indicating/adjustment module

vessel wall (with solids). To adapt the sensor to these different
conditions, you should first select in this menu item "Liquid" or

"Solid".

Medium

Liquid

With solids, you can also choose between "Powder/Dust",
"Granular/Pellets" or "Ballast/Pebbels".

Through this additional selection, the sensor is adapted
perfectly to the product and measurement reliability, partic­ularly in products with bad reflective properties, is considerably
increased.

Enter the requested parameter via the appropriate keys, save
your settings and jump to the next menu item with the [–>] key.

Vessel shape

Damping

Apart from the medium also the vessel form can influence the
measurement. To adapt the sensor to these conditions, this
menu item offers (depending on either liquid or solid is
detected) different options. For Liquid these are Storage tank,

Stilling tube, Open vessel or Stirred vessel, for Solid Silo or
Bunker.

Vessel shape

Storage tank

Enter the requested parameter via the appropriate keys, save
your settings and jump to the next menu item with the [–>] key.

To suppress fluctuation in the measured value display, e.g.
caused by a turbulent product surface, an integration time can
be set. This time can be between 0 and 999 seconds. Please
note that the reaction time of the entire measurement will be
longer and the sensor will react to quick changes of the
measured value with a corresponding delay. In general, a time
of a few seconds is sufficient to smooth the measured value
display.

Damping

0 s

30508-EN-050914

28 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

Setup with the indicating/adjustment module

Enter the requested parameter via the appropriate keys, save

your settings and jump to the next menu item with the [–>] key.

Linearization curve

Sensor-TAG

A linearization is necessary for all vessels in which the vessel
volume does not increase linearly with the level – e.g. in a
cylindrical or spherical tank -–and the indication or output of
the volume is requested. Corresponding linearization curves
are preprogrammed for these vessels. They represent the
correlation between the level percentage and vessel volume.
By activating the appropriate curve, the volume percentage of
the vessel is displayed correctly. If the volume should not be
displayed in percent but e.g. in l or kg, a scaling can be also
set in the menu item "Display".

Linearization curve

Linear

Enter the requested parameter via the appropriate keys, save
your settings and jump to the next menu item with the [–>] key.

In this menu item you can enter an unambiguous designation
for the sensor, e.g. the measurement loop name or the tank or
product designation. In digital systems and in the documen­tation of larger plants, a singular designation should be entered
for exact identification of individual measuring sites.

Sensor-TAG

Sensor

With this menu item, the Basic adjustment is finished and you
can now jump to the main menu with the [ESC] key.

False signal suppression

High sockets or vessel installations, such as e.g. struts or
agitators as well as buildup and weld joints on the vessel walls
cause interfering reflections which can impair the measure­ment. A false signal suppression detects, marks and saves
these false signals, so that they are no longer taken into
account for the level measurement. This false signal sup­pression should be created with empty vessel so that all
potential interfering reflections will be detected.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 29

Setup with the indicating/adjustment module

False signal suppression

Change now?

Proceed as follows:

1 Move from the measured value display to the main menu

by pushing [OK].

2 Select the menu item "Service" with [–>] and confirm with

[OK]. Now the menu item "False signal suppression" is

displayed.

3 Confirm "False signal suppression - Change now" with

[OK] and select in the below menu "Create new". Enter the
actual distance from the sensor to the product surface. All
false signals in this area are detected by the sensor and
saved after confirming with [OK].

Note:

Check the distance to the product surface, because if an
incorrect (too large) value is entered, the existing level will be
saved as false signal. The filling level would then no longer be
detectable in this area.

Optional settings

Additional adjustment and diagnosis options such as e.g.
scaling, simulation or trend curve presentation are shown in
the following menu schematic. You will find a detailed
description of these menu items in the operating instructions
manual of the indicating and adjustment module.

30 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Basic adjustment

▶

Basic adjustment
Display
Diagnostics
Service
Info

Setup with the indicating/adjustment module

6.5 Menu schematic

1

Min. adjustment

0.00 %

=

4.000 m(d)

3.000 m(d)

Damping

0 s

Display

Basic adjustment

▶

Display
Diagnostics
Service
Info

Displayed value

scaled

Diagnostics

Basic adjustment
Display

▶

Diagnostics
Service
Info

1.1

1.5

2.1

2

3

Max. adjustment

100.00 %

=

1.000 m(d)

2.000 m(d)

Linearization curve

Linear

Display units

Volume
m³

1.2

1.6

2.2

Medium

Liquid

Sensor-TAG

Scaling

0 %=0.0 m³

100 %=100.0 m³

Sensor

1.3

1.7

2.3

Vessel shape

Storage tank

1.4

Peak values
Distance-min.: 0.234 m(d)
Distance-max: 5.385 m(d)
T-min.: 16.5°C
T-min.: 37.5°C

3.1

Meas. reliability

36dB

Sensor status

OK

3.2

Choose curve

Echo curve

3.3

Echo curve

Presentation of the echo

curve

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 31

3.4

Setup with the indicating/adjustment module

Service

Basic adjustment
Display
Diagnostics

▶

Service
Info

4

False signal suppression

Change now?

Reset

Reset?

Copy sensor data

Copy sensor data?

Info

Basic adjustment
Display
Diagnostics
Service

▶

Info

Sensor type

OPTISOUND 30x0 C

Serial number

12345678

4.1

4.5

4.9

5.1

5

Addl. adjustments

none

Units of measurement

m(d)

select?

PIN

Enable?

Date of manufacture

26. July 2005
Software version

3.26

4.2

4.6

4.10

5.2

Current output

Output mode 4-20 mA
Failure mode: <3.6mA
Min-current 3.8mA

Language

Deutsch

Date of last change using PC

26. July 2005

4.3

4.7

5.3

Simulation

Start simulation?

HART mode

Standard

Address 0

Sensor details

Display now?

4.4

4.8

5.4

32 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Maintenance and fault rectification

7 Maintenance and fault rectification

7.1 Maintenance

When used as directed in normal operation, OPTISOUND
3020 C is completely maintenance-free.

7.2 Fault rectification

Causes of malfunction

Fault rectification

Checking the 4 … 20 mA sig-

nal

OPTISOUND 3020 C offers maximum reliability. Nevertheless
faults can occur during operation. These may be caused by the
following, e.g.:

l Sensor
l Process
l Power supply
l Signal processing.

The first measures to be taken are to check the output signal
and evaluate fault messages via the indicating/adjustment
module. The procedure is described below.

Connect a hand-held multimeter with a suitable measuring
range acc. to the wiring plan.

? 4 … 20 mA signal not stable

l level fluctuations

à set integration time via the indicating/adjustment

module

? 4 … 20 mA signal missing

l wrong connection

à Check connection acc. to chapter "Connection proce-

dure" and correct, if necessary, acc. to chapter "Wiring
plans"

l no power supply

à check cables for line break, repair, if necessary

l load resistance too high

à check and adapt, if necessary

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 33

Maintenance and fault rectification

? Current signal greater than 22 mA or less than 3.6 mA

l Electronics module defective

à Exchange instrument or return it for repair

In Ex applications, the regulations for the wiring of intrinsically
safe circuits must be observed.

Fault messages via the indi­cating/adjustment module

? E013

l no measured value available

à sensor in boot phase

à sensor does not find an echo, e.g. because of faulty

installation or incorrect parameter adjustment

? E017

l adjustment span too small

à Carry out a fresh adjustment and increase the distance

between min. and max. adjustment

? E036

l no operable sensor software

à carry out a software update or return instrument for

repair

? E041

l hardware error, electronics defective

à Exchange instrument or return it for repair

7.3 Exchanging the electronics

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

In Ex applications, only instruments and electronics modules
with appropriate Ex approval may be used.

34 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Maintenance and fault rectification

If there is no electronics module available on site, it can be
ordered from the responsible Krohne agency.

7.4 Instrument repair

If a repair is necessary, please proceed as follows:

You can download a return form from our Internet homepage
http://www.krohne-mar.com/fileadmin/media-lounge/PDF-
Download/Specimen_e.pdf.

By doing this you help us carry out the repair quickly and

without having to call back for needed information.

l Print and fill out one form per instrument
l Clean the instrument and pack it damage-proof
l Attach the completed form and possibly also a safety data

sheet to the instrument.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 35

Dismounting

8 Dismounting

8.1 Dismounting procedure

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.

8.2 Disposal

OPTISOUND 3020 C consists of materials which can be
recycled by specialised recycling companies. We have
purposely designed the electronic modules to be easily
separable. Mark the instrument as scrap and dispose of it
according to national government regulations (e.g. in G ermany
acc. to the EU Directive on Waste Electrical and Electronic

Equipment, WEEE).

Materials: see "Technical data"

If you cannot dispose of the instrument properly, please

contact us about disposal methods or return.

36 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Supplement

9 Supplement

9.1 Technical data

General data

Materials, wetted parts

- Process fitting thread G 2A and 2 NPT: PVDF

- Transducer PVDF

- seal transducer/thread EPDM

Materials, non-wetted parts

- Housing plastic PBT (Polyester), Alu-die casting pow-

der-coated, 316L (1.4435)

- Seal ring between housing and

housing cover

- Inspection window in housing cover Polycarbonate

- Ground terminal 316Ti/316L (1.4571/1.4435)

NBR (stainless steel housing), silicone (Alu/
plastic housing)

Weight 1.8

… 4.0 kg (4.0 … 8.8 lbs), depending on

process fitting and housing

Max. torque mounting boss 25 Nm

Output variable

Output signal 4 … 20 mA/HART
Resolution 1.6 µA
Fault signal current output unchanged; 20.5 mA; 22 mA;

<3.6 mA (adjustable)
Current limitation 22 mA
Load max. 500 Ohm
Integration time (63 % of the input

0 … 999 s, adjustable

2)

variable)
Fulfilled NAMUR recommendation NE 43

Input variable

Parameter distance between lower edge of the transducer

and product surface

Dead zone 0.4 m (1.3 ft)
Measuring range

- Liquids up to 8 m (26.2 ft)

- Solids up to 3.5 m (11.5 ft)

2)

With inductive load, ohmic share at least 25 Ohm/mH.

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 37

Supplement

Accuracy (similar to DIN EN 60770-1)

Reference conditions acc. to DIN EN 61298-1

- Temperature 18 … +30°C (64 … +86°F)

- Relative humidity 45 … 75 %

- Atmospheric pressure 860 … 1060 mbar (86 … 106 kPa/

12.5 … 15.4 psi)

Characteristic curve deviation and measurement characteristics

Average temperature coefficient of the

0.06 %/10 K

3)

zero signal (temperature error)

Resolution, general max. 1 mm
Ultrasonic frequency 55 kHz
Interval > 2 s (dependent on the parameter adjustment)
Beam angle at -3 dB 5.5°
Adjustment time

4)

>3 s (dependent on the parameter adjustment)

Accuracy better than 0.2 % or ±4 mm (see diagram)

16 mm

10 mm

4 mm

-4 mm

-10 mm

-16 mm

Fig. 22: Accuracy OPTISOUND 3020 C

8 m4 m3 m2 m 7 m6 m5 m1 m

3)

Relating to the nominal range, incl. hysteresis and repeatability, determined
acc. to the limit point method.

4)

Time to output the correct level (with max. 10 % deviation) after a sudden
level change.

38 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Supplement

Ambient conditions

Ambient, storage and transport temperature

- without indicating/adjustment mod-

-40 … +80°C (-40 … +176°F)

ule

- the indicating/adjustment module -20 … +70°C (-4 … +158°F)

Process conditions

Vessel pressure -20 … 200 kPa (-0.2 … 2.0 bar/-2.9 … 29 psi)
Process temperature (transducer tem-

-40 … +80°C (-40 … +176°F)

perature)
Vibration resistance mechanicalvibrations with 4 g and 5

… 100 Hz

Electromechanical data

Cable entry

- Double chamber housing

l 1x cable entry M20x1.5 (cable-ø 5 … 9 mm),

1x blind stopper M20x1.5

or:

l 1x closing cap ½ NPT, 1x blind stopper

½ NPT

Spring-loaded terminals for wire cross sections up to 2.5 mm²

Indicating and adjustment module

Power supply and data transmission through sensor via gold-plated sliding contacts

(I²C bus)

Indication LC display in full dot matrix
Adjustment elements 4 keys
Protection

- unassembled IP 20

- mounted into the sensor without

IP 40

cover

5)

Materials

- Housing ABS

- Inspection window Polyester foil

Supply voltage

Supply voltage

- non-Ex and Exd instrument 20 … 72 VDC, 20 … 253 VAC, 50/60 Hz
Power consumption max. 4 VA; 2.1 W

5)

Tested acc. to the regulations of German Lloyd, GL directive 2

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 39

Supplement

Electrical protective measures

Protection IP 66/IP 67
Overvoltage category III
Protection class I

Approvals

6)7)

ATEX ATEX II 1G, 1/2G, 2GEExiaIIC T6

6)

Deviating data with Ex applications: see separate safety instructions.

7)

Depending on order specification.

40 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

9.2 Dimensions

OPTISOUND 3020 C

")
/

25

")

32

/

1

20mm (

153mm (6

32

")
/

31

63mm

(2

Supplement

60mm

(2 23/64")

G2A /
2"NPT

64

1 2

ø 50mm

31

(1

/32")

ø 74mm

58

(2

/64")

Fig. 23: OPTISOUND 3020 C
1 Dead zone: 0.4 m (1.3 ft)
2 Meas. range: in liquids up to 8 m (26.2 ft), in solids up to 3,5 m (11.5 ft)

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 41

Supplement

9.3 Certificate

CE declaration of conformity

Fig. 24: CE declaration of conformity

42 OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire

30508-EN-050914

Supplement

30508-EN-050914

OPTISOUND 3020 C - 4 ... 20 mA/HART - four-wire 43

Subject to change without notice

30508-EN-050914