KRAL BEM 300 User manual

Operating instructions
KRAL display and processing unit
BEM 300
SW 2.004
OIE 15en-GB
Edition 2020-03
Original instructions
www.kral.at

Table of contents
1 About this document ..................................................... 3
1.1 General information .......................................................3
1.2 Target groups ................................................................3
1.3 Associated documents ..................................................3
1.4 Symbols.........................................................................3
1.4.1 Danger levels ....................................................3
1.4.2 Danger signs.....................................................4
1.4.3 Symbols in this document .................................4
2 Safety .............................................................................. 4
2.1 Proper use .....................................................................4
2.2 Foreseeable misuse ......................................................4
2.3 Fundamental safety instructions....................................4
3 Technical data ................................................................ 5
3.1 Dimensional drawing .....................................................5
3.2 Display...........................................................................5
3.3 Connection data ............................................................5
3.3.1 Power supply ....................................................5
3.3.2 Tension spring terminals...................................5
3.3.3 Pulse input and analog input.............................6
3.3.4 Analog output and pulse output ........................6
3.3.5 Modbus interface ..............................................6
3.4 Connection field.............................................................7
3.5 Pin assignment ..............................................................7
3.6 Ambient conditions ........................................................8
3.7 Accessories ...................................................................8
4 Function description...................................................... 8
4.1 Functional principle........................................................8
4.1.1 Usage................................................................8
4.1.2 Volume measurement.......................................9
4.1.3 Mass calculation ...............................................9
4.1.4 Averaging..........................................................9
4.1.5 Flow direction detection ....................................9
4.1.6 Electronic evaluation.........................................9
4.1.7 Modbus connection...........................................9
4.1.8 Applications.......................................................9
4.2 Modbus interface .........................................................11
5 Transportation, storage............................................... 12
5.1 Scope of delivery .........................................................12
5.2 Unpacking and checking the state of delivery .............12
6 Installation, removal .................................................... 12
6.1 Dangers during installation, removal ...........................12
6.2 Installing the electronic unit in the control cabinet .......12
6.3 Mounting the electronic unit to the wall .......................13
6.4 Mounting the electronic unit at the pipe/flowmeter ......13
7 Connection ................................................................... 14
7.1 Dangers during connection work .................................14
7.2 Connecting cables to the tension spring terminals ......14
7.3 Connecting the pick up ................................................15
7.4 Connecting analog outputs and pulse inputs...............15
7.5 Connecting the power supply ......................................16
8 Commissioning ............................................................ 16
8.1 Checking the electronic unit ........................................16
9 Decommissioning ........................................................ 17
9.1 Taking the electronic unit out of operation...................17
10 Operation........................................................................17
10.1 Abbreviations, units and signals ..................................17
10.1.1 Abbreviations...................................................17
10.1.2 Units ................................................................17
10.1.3 Pulse signals ...................................................17
10.2 Key assignment ...........................................................18
10.3 Operation at a glance...................................................18
11 Menu description...........................................................20
11.1 Start .............................................................................20
11.2 Menu structure .............................................................20
11.3 Menu0: Settings (protected)........................................20
11.4 Menu 1: Display ...........................................................21
11.5 Menu 2: General settings.............................................21
11.6 Menu 3: K-factors flowmeterA.....................................23
11.7 Menu 4: Density table1 ...............................................23
11.8 Menu 7: Alarms............................................................23
12 Maintenance...................................................................24
12.1 Required maintenance.................................................24
12.2 Cleaning the electronic unit..........................................24
13 Disposal..........................................................................24
13.1 Disposing of the electronic unit ....................................24
14 Troubleshooting ............................................................24
14.1 Fault table ....................................................................24
15 Accessories ...................................................................26
15.1 Installation....................................................................26
15.1.1 Fixing kits.........................................................26
15.1.2 Universal mount fixing kit.................................26
15.1.3 Fixing kit for pipe mounting/mounting on OMG
.........................................................................27
15.1.4 Fixing kit mounting on OME ............................27
15.1.5 Adapter set for conversion of BEM4U to
BEM300/BEM500 ........................................27
15.2 Electrical connection ....................................................28
15.2.1 Different voltage ..............................................28
15.2.2 Rack mounting power supply unit EEN12 ......28
15.2.3 Plug-in power supply unit EEN13 ...................30
16 Appendix ........................................................................30
16.1 Glossary.......................................................................30
2OIE 15en-GB Edition 2020-03 Operating instructions

1 About this document
1.1 General information
1 About this document
1.1 General information
These instructions form part of the product and must be kept for future reference. Furthermore please
observe the associated documents.
Notice In these operating instructions the designation "Electronic unit" is used for the "Display and processing
unit".
1.2 Target groups
The instructions are intended for the following persons:
oPersons who work with the product
oOperator-owners who are responsible for the use of the product
Persons who work with the product must be qualified. The qualification ensures that possible dangers
and damage to property that are connected to the activity are detected and avoided. These persons
are qualified personnel who carry out the work properly due to their training, knowledge and experience
and on the basis of the relevant provisions.
Information on the qualification of the personnel is provided separately at the beginning of the indi-
vidual chapters in these instructions. The following table provides an overview.
Target group Activity Qualification
Fitter Mounting,
connection
Qualified personnel for mounting
Electrician Electrical
connection
Qualified personnel for electric installation
Trained personnel Delegated task Personnel trained by the operator-owner who know the
task delegated to them and the possible dangers arising
through improper behaviour.
Tab.1: Target groups
1.3 Associated documents
oDeclaration of conformity according to EU Directive 2014/30/EU
oCorresponding operating instructions of the flowmeter
oCorresponding operating instructions of the sensor
oCalibration certificate
oWork sheet
oWiring diagram
1.4 Symbols
1.4.1 Danger levels
Signal word Danger level Consequences of non-observance
DANGER Immediate threat of danger Serious personal injury, death
WARNING Possible threat of danger Serious personal injury, invalidity
CAUTION Potentially dangerous situation Slight personal injury
ATTENTION Potentially dangerous situation Material damage
Operating instructions OIE 15en-GB Edition 2020-03 3

2 Safety
2.1 Proper use
1.4.2 Danger signs
Meaning Source and possible consequences of non-observance
Electrical voltage Electrical voltage causes serious physical injury or death.
1.4.3 Symbols in this document
Meaning
Warning personal injury
Safety instruction
Request for action
1.
2.
3.
Multi-step instructions for actions

Action result

Cross-reference
2 Safety
2.1 Proper use
oThe electronic unit is provided for usage with a KRAL flowmeter.
oUse the electronic unit only within the operating limits specified in the "Technical data" chapter.
2.2 Foreseeable misuse
oAny use that extends beyond the proper use or any other use is misuse.
2.3 Fundamental safety instructions
The following safety instructions must be observed:
oRead the operating instructions carefully and observe them.
oHave work only carried out by qualified personnel/trained personnel.
oWear personal protective equipment and work carefully.
oObserve the operating instructions of the flowmeter and of the sensors.
4OIE 15en-GB Edition 2020-03 Operating instructions

3 Technical data
3.1 Dimensional drawing
3 Technical data
3.1 Dimensional drawing
145
145
118
86,5
12,5
0,5 - 5,0
4
Fig.1: Dimensional drawing
Parameter Unit Value
H x W x D [mm] 145 x 145 x 118
Tab.2: Dimensions
3.2 Display
Criterion Data
Text display 4lines/20characters
Updating rate 100ms
Background illumination 20levels, can be adjusted via software or analog
input
Contrast 20levels, can be adjusted via software
Language selection oGerman
oEnglish
oFrench
oSpanish
3.3 Connection data
3.3.1 Power supply
Parameter Unit Value
Power supply [VDC] 24±20%
Max. current consumption [mA] 0.5
Insulation voltage [V] <500
3.3.2 Tension spring terminals
Cable type Unit Terminating range
Strand [mm2] 0.08–2.5
Litz wires [mm2] 0.08–2.5
Wire end ferrule [mm2] 0.08–1.5
Operating instructions OIE 15en-GB Edition 2020-03 5

3 Technical data
3.3 Connection data
3.3.3 Pulse input and analog input
Component Designation Unit Value
Pulse input Limit frequency min.-max. [Hz] 0.5–
20000
Power supply for pick up NPN/PNP [VDC] 24
Namur [V] 8.2
Input impedance NPN/PNP [kΩ] 3.2
Namur [kΩ] 1
Can be configured for counter mode or encoder mode
Analog input
0–10V (background
illumination)
Input resistance [kΩ] 3.4
Only possible for U=0V setting in the menu
3.3.4 Analog output and pulse output
Component Designation Unit Value
Analog output
4–20mA
Active current source
Short-circuit proof
Scalable
Load [Ω] <500
Electrical isolation [Veff] 500
Resolution [μA] 1
Temperature drift [%] ±0.1
Calibration tolerance [%] ±0.1
Reaction time: 0.15s x smoothing value
Analog output
0–10V
Active voltage source
Short-circuit proof
Scalable
Load [Ω] >500
Resolution [mV] 1
Temperature drift [%] ±0.1
Calibration tolerance [%] ±0.1
Reaction time: 0.15s x smoothing value
Pulse output Active pulse sources (PNP transistor switches power supply)
Output current max. [mA] 20
Short-circuit proof
Load [kΩ] >1
Scalable
Signal level at 24VDC power supply High [VDC] >20
Low [VDC] <1
Pulse width adjustable High [ms] 2–200
Flow direction detection in the Encoder mode possible
Max. output frequency at pulse width 2ms [Hz] 250
3.3.5 Modbus interface
Designation Unit Data/value
Interface type oRS 232 (SLAVE)
oRS 485 (SLAVE)
Baud rate [Bd] 9600
Data format 8N1 (8 data bits, no parity, 1 stop bit)
Protocol Modbus RTU
Processor cycle time [ms] 20
6OIE 15en-GB Edition 2020-03 Operating instructions

3 Technical data
3.4 Connection field
3.4 Connection field
1
2
3
4
5
6
7
8
9
000766
1
2
3
4567
89
10
11
12 13 14 15 16 17 18 19 20 21
A+
B-
Fig.2: Termination panel electronic unit
1Power supply (24VDC) 6Pick up1
2Analog output (4-20mA) 7Pick up2
3Analog output (0–10V) 8Analog input (0–10V)background illumination
4Serial interface (RS232) 9Pulse output
5Modbus interface (RS485)
The Modbus connection takes place via terminals. The assignment of the terminals is shown in the wir-
ing diagram. The address of the electronic unit at the Modbus can be selected per software, see 2.10
Modbus address.
3.5 Pin assignment
Component Connection/function Terminal
Pick up NPN/PNP
Push-pull
Namur
Pick up1 U+24VDC U+8.2VDC 12
Signal Signal 13
Gnd – 14
Pick up2 (+90°) U+24VDC U+8.2VDC 15
Signal Signal 16
Gnd – 17
Operating instructions OIE 15en-GB Edition 2020-03 7

4 Function description
3.6 Ambient conditions
Component Connection/function Terminal
Analog output 4–20mA 0–10V
Signal 3 5
Gnd 4 6
Pulse output Signal 20
Gnd 21
Analog input Background illumination
0–10V 18
Gnd 19
Serial interface RS485 B 10
A 11
RS232 TxD 7
RxD 8
Gnd 9
Power supply Different power supply units are available as accessories Ä Accessories,Page26.
+24VDC 1
Gnd 2
Tab.3: Pin assignment
3.6 Ambient conditions
Parameter Unit Data/value
Storage temperature min.–max. [°C] -20...+80
Operating temperature min.–max. [°C] -20...+70
Humidity (relative humidity, non-condensing) [%] 97
EMC emitted interference/immunity to interference EN 61326
Vibration oEN60068–2–47
oEN60068–2–64
Shock EN 61373
Isolation min. [V] 500
Degree of protection IP 65
Tab.4: Ambient conditions
3.7 Accessories
Notice The technical data of the accessories are specified separately Ä Accessories,Page26.
4 Function description
4.1 Functional principle
4.1.1 Usage
The electronic unit is provided for usage with a KRAL flowmeter.
Flowmeters generate a specific number of pulses per flow volume unit - depending on the size and
working point. This device-specific characteristic is called the K-factor (unit: pulses/liter) and is spe-
cified on the calibration certificate.
The pulse signals of one flowmeter can be evaluated. A pulse input for pick up with the following func-
tions is available:
oNPN
oPNP
oNamur
8OIE 15en-GB Edition 2020-03 Operating instructions

4 Function description
4.1 Functional principle
Either NPN or PNP can be selected for push-pull pick ups. In addition the flowmeter can also be
equipped with pick ups for flow direction detection. The electronic unit is supplied with settings in ac-
cordance with the customer requirements.
4.1.2 Volume measurement
Each positive edge of the pulse signal starts a period measurement and at the same time stops the
previous measurement. The flow rate is then calculated via the frequency (= inverse of the period dura-
tion) and the K-factor. The inverse of the K-factor is the pulse value in I/P. This is retroactively added to
the total sums for each positive edge of the signal.
4.1.3 Mass calculation
The volume can be converted into mass via a configurable fixed density value (menu4).
4.1.4 Averaging
A strongly fluctuating flow rate causes a jumping display or as a result a fluctuating analog output. The
averaging function reduces this effect by generating a averaging across several measured values. The
number of measured values for averaging can be set. See 2.07Averaging analog output and see
2.12Averaging display rate.
4.1.5 Flow direction detection
In extreme cases the flow direction can change through pulsations, meaning through liquid waves in
the pipe system. Through the use of two pick ups that supply signals out of phase by 90° (square wave
encoder signals), a reversal in the flow direction is recognized by means of the flow direction sensor
and taken into account when calculating the total value. The electronic unit offers incremental encoding
inputs for each flowmeter. This means that the flow direction can be determined without additional
components and taken into account in the calculation at any time.
4.1.6 Electronic evaluation
The electronic unit receives signals from the pick ups and calculates the measured values which are in-
dicated in the display unit and which can be called up at the analog output or at the Modbus interface.
Possibilities of the electronic unit:
oLanguage selection
oDisplay of the measured values in different units (volumes, masses and temperatures)
oAveraged display values
oA density for conversion to mass
oInformation message at faults or invalid inputs
o1 scalable and assignable analog output 0-10V or 4-20mA
o1 scalable and assignable pulse output
o1 analog input 0–10V for background illumination
4.1.7 Modbus connection
The electronic unit can be connected to the system by means of a Modbus interface and can thus be
integrated into existing systems. This ensures simple, reliable and rapid data exchange.
4.1.8 Applications
Different extension stages of the electronic unit are presented on the basis of the following examples.
This allows the required functional scope to be selected in accordance with the requirements.
Single-line measurement
Extension stage Components Functions
000135
Basic
o1 flowmeter
o1 pick up
o1 BEM 300 electronic unit
oElectronic evaluation
oVolume measurement
o1 analog output
o1 pulse output
Operating instructions OIE 15en-GB Edition 2020-03 9

4 Function description
4.1 Functional principle
Extension stage Components Functions
000136
Basic + temperature compensation
o1 flowmeter
o1 pick up
o1 temperature sensor Pt100
o1 BEM500 electronic unit
oElectronic evaluation
oVolume measurement
oMass flow measurement
oTemperature compensation
o2 relay outputs
o2 analog outputs
o2 pulse outputs
oFilling
000137
Basic + flow direction detection
o1 flowmeter
o2 pick ups
o1 BEM 300 electronic unit
oElectronic evaluation
oVolume measurement
oFlow direction detection
o1 analog output
o1 pulse output
000138
Basic + flow direction detection +
temperature compensation
o1 flowmeter
o2 pick ups
o1 temperature sensor Pt100
o1 BEM 500 electronic unit
oElectronic evaluation
oVolume measurement
oFlow direction detection
oMass flow measurement
oTemperature compensation
o2 relay outputs
o2 analog outputs
o2 pulse outputs
oFilling
Tab.5: Extension stages single-line measurement
Notice The BEM 500 electronic unit can also be used for two separate single-line measurements.
Differential measurement
Extension stage Components Functions
000139
Basic
o2 flowmeters
o1 pick up each
o1 BEM500 electronic unit
oElectronic evaluation
oDifferential measurement
o2 relay outputs
o2 analog outputs
o2 pulse outputs
000140
Basic + temperature compensation
o2 flowmeters
o1 pick up each
o1 temperature sensor Pt100
each
o1 BEM500 electronic unit
oElectronic evaluation
oDifferential measurement
oMass flow measurement
oTemperature compensation
o2 relay outputs
o2 analog outputs
o2 pulse outputs
000141
Basic + flow direction detection
o2 flowmeters
o2 pick up each
o1 BEM500 electronic unit
oElectronic evaluation
oDifferential measurement
oFlow direction detection
o2 relay outputs
o2 analog outputs
o2 pulse outputs
10 OIE 15en-GB Edition 2020-03 Operating instructions