KRAL BEM 100 User manual

Operating instructions
KRAL processing unit
BEM 100
SW 1.06
OIE 26en-GB
Edition 2021-08
Original instructions
www.kral.at

Table of contents
1 About this document ..................................................... 3
1.1 Target groups ................................................................3
1.2 Associated documents ..................................................3
1.3 Symbols.........................................................................3
1.3.1 Danger levels ....................................................3
1.3.2 Danger signs.....................................................3
1.3.3 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 Identification................................................................... 4
3.1 Rating plate ...................................................................4
4 Technical data ................................................................ 5
4.1 Ambient conditions ........................................................5
4.2 Dimensional drawing .....................................................5
4.3 Power supply .................................................................5
4.4 Modbus interface ...........................................................6
4.5 Cable specification ........................................................6
4.6 Pin assignment ..............................................................6
5 Function description...................................................... 6
5.1 Functional principle........................................................6
5.1.1 Usage................................................................6
5.1.2 Communication .................................................6
5.1.3 Volume measurement.......................................7
5.1.4 Linearization......................................................7
5.1.5 Density determination .......................................7
5.1.6 Mass measurement ..........................................7
5.1.7 Differential measurement and synchronization
..........................................................................7
5.1.8 Averaging..........................................................7
5.2 Modbus communication.................................................8
5.2.1 Supported Modbus functions ............................8
5.2.2 Sequence of the data values ............................8
5.2.3 Legend for the parameter tables.......................8
5.2.4 Protected parameters .......................................8
5.2.5 Automatically updated parameters ...................9
5.2.6 Parameters for configuration.............................9
5.2.7 K-factor table...................................................10
5.2.8 Density tables .................................................11
5.2.9 Error messages...............................................12
5.2.10 Parameter for clearing error messages ..........13
6 Transportation, storage............................................... 13
6.1 Unpacking and checking the state of delivery .............13
6.2 Transporting the electronic unit ...................................13
6.3 Storing the electronic unit ............................................13
7 Installation, removal .................................................... 14
7.1 Dangers during installation, removal ...........................14
7.2 Installing the processing unit .......................................14
7.3 Removing the processing unit .....................................14
8 Connection ................................................................... 14
8.1 Dangers during connection work .................................14
8.2 Connecting the processing unit ...................................14
9 Operation ...................................................................... 16
9.1 Carrying out the basic settings ....................................16
9.1.1 Setting the Modbus address............................16
9.1.2 Managing the density table..............................16
9.1.3 Entering the density table ................................17
9.1.4 Selecting the mode for volume measurement
.........................................................................18
9.1.5 Specifying the reference temperature for tem-
perature compensation....................................18
9.1.6 Smoothing the indication .................................18
9.1.7 Selecting the mode for pulse evaluation..........18
9.1.8 Specifying the maximum flow rate...................19
9.1.9 Specifying the minimum flow rate....................19
9.2 Reading the measured values and status information
.....................................................................................19
9.2.1 Synchronizing measured values......................19
9.2.2 Clearing error messages .................................20
10 Maintenance...................................................................20
10.1 Required maintenance.................................................20
10.2 Cleaning the electronic unit..........................................20
11 Disposal..........................................................................21
11.1 Disposing of the electronic unit ....................................21
12 Troubleshooting ............................................................21
12.1 Status LEDs .................................................................21
12.2 Fault table ....................................................................21
12.3 Error tree: No communication ......................................22
12.4 Error tree: No flow........................................................23
12.5 Error tree: Flow unusually high ....................................23
12.6 Error tree: Flow rate varies too much...........................23
2OIE 26en-GB Edition 2021-08 Operating instructions

1 About this document
1.1 Target groups
1 About this document
1.1 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
1.2 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
1.3 Symbols
1.3.1 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
1.3.2 Danger signs
Meaning Source and possible consequences of non-observance
Electrical voltage Electrical voltage causes serious physical injury or death.
Operating instructions OIE 26en-GB Edition 2021-08 3

2 Safety
2.1 Proper use
1.3.3 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
Use the processing unit only within the operating limits specified in the chapter "Technical data".
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.
3 Identification
3.1 Rating plate
1
2
4
3
Fig.1: Rating plate processing unit
1Serial number processing unit
2Temperature range processing unit
3Power supply processing unit
4Serial number flowmeter
4OIE 26en-GB Edition 2021-08 Operating instructions

4 Technical data
4.1 Ambient conditions
4 Technical data
4.1 Ambient conditions
Parameter Unit Value min. Value max.
Storage temperature [°C] -40 +105
Operating temperature [°C] -40 +105
Humidity relative (not condensing) [%] 10 90
Vibration (@ 20mm/s, ± 1.0g max.) [Hz] 5 50
Degree of protection IP 67
Tab.2: Ambient conditions
4.2 Dimensional drawing
24
M12 73
55
80
Fig.2: Dimensional drawing processing unit
Parameter Unit Value
L x W x H [mm] 80 x 73 x 24
Tab.3: Dimensions
4.3 Power supply
Parameter Unit Value min. Value max.
Power supply [VDC] 10 30
Current consumption [mA] – 40
Insulation voltage [V] 500
Tab.4: Power supply
Operating instructions OIE 26en-GB Edition 2021-08 5

5 Function description
4.4 Modbus interface
4.4 Modbus interface
Parameter Value
Interface type RS-485
Baud rate 9600 / 19200 / 38400 / 57600 / 115200
Protocol Modbus RTU
Data format 8N1 (8 data bits, no parity, 1 stop bit)
Refresh time parameter 1/16 [s]
Tab.5: Modbus interface
4.5 Cable specification
Note The manufacturer recommends the observance of the cable specifications at the cables used.
Parameter Unit Value
Conductors o2 x power supply (≥1mm²)
o2 x Modbus communication, twisted-pair and shielded (≥0,25mm²)
Terminating resistor [Ω] 120 (between A and B)
Cable diameter For opening M12
Length max. [m] 300 (at full load)
Tab.6: Cable specification
4.6 Pin assignment
4
32
1
5
4
32
1
5
MODBUS IN MODBUS OUT
Fig.3: Pin assignment
Pin Description
1 Shield
2 DC power supply 10–30 V (+)
3 DC power supply 0 V (- or GND)
4 RS-485 A / + / RXTX-P (positive)
5 RS-485 B / – / RXTX-N (negative) / inverted
Tab.7: Pin assignment
5 Function description
5.1 Functional principle
5.1.1 Usage
The processing unit is intended for usage with a KRALflowmeter of the OMECompactseries and is
mounted directly on the 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/litre) and is spe-
cified on the calibration certificate.
5.1.2 Communication
The processing unit operates with a Modbus connection (single-bus architecture). Pre-assembled
cables serve to supply electricity and to transfer signals to an external display device, such as a PC or
laptop (Human-Machine Interface / HMI). There the calculated measured results can be displayed.
6OIE 26en-GB Edition 2021-08 Operating instructions

5 Function description
5.1 Functional principle
123
4
C1
C2
5
6
Fig.4: Connecting several processing units
1Flowmeter with processing unit 5Display device (HMI)
2Flowmeter with processing unit 6Power supply display device
3Flowmeter with processing unit C1 Power supply processing unit
4Terminating resistor C2 Connection Modbus RS-485
Up to 32 processing units can be connected (32 sensor evaluations electrically in parallel).
5.1.3 Volume measurement
The volume is calculated cyclically by counting of the pulses divided by the K-factor (in pulses/liter).
The flow rate is always defined by volume/time unit.
oThe totalled overall flow ("Total_Volume_1" parameter) can only be reset in the works.
oThe totalled overall flow ("Total_Volume_2" parameter) can only be reset by the user.
5.1.4 Linearization
The K-factor of a flowmeter shows slightly different values at different flow rates. These are docu-
mented in the enclosed calibration certificate. In order to improve the measuring precision these differ-
ent values can be taken into consideration by means of a "Linearization". To this purpose the K-factors
are stored for a maximum of eight interpolation values. The K-factor relevant for the currently meas-
ured flow rate is then determined with linear interpolation between the two nearest interpolation values.
5.1.5 Density determination
The flowmeters are equipped with a temperature sensor.
The density of the medium is determined by means of the measured temperature. To this purpose the
processing unit provides six different modes:
oDensity calculation for fuel oils LDO/MDO or HFO (Mode 4, 5, 6)
Here only the density at 15°C has to be entered.
oDensity calculation for other media (Mode 0, 1, 2)
5.1.6 Mass measurement
The mass is calculated from volume times density.
5.1.7 Differential measurement and synchronization
Two flowmeters are used for differential measurement - one flowmeter in the feed line and one flow-
meter in the return line. The "Hold" function is available for the synchronization. This function allows the
HMI to set the output registers of the processing units briefly to "Hold" and thus to fetch the measured
values for the differential generation – at the current moment – while in the background the processing
units continue to measure the pulses received from the flowmeters and carry out all calculations.
5.1.8 Averaging
A strongly fluctuating flow rate causes the display to jump, making an interpretation by the user difficult.
The averaging function reduces this effect by generating an averaging across several measured
values.
Operating instructions OIE 26en-GB Edition 2021-08 7

5 Function description
5.2 Modbus communication
5.2 Modbus communication
5.2.1 Supported Modbus functions
Code Modbus function Register Application examples
03Hex READ HOLDING REGISTERS 4xxxx - Reading out of measured values, counter
statuses, average values
- Reading out of the device configuration
10Hex PRESET MULTIPLE REGISTERS 4xxxx - Device programming
Tab.8: Modbus functions
Note The maximum size of a data packet is 125 registers (words).
5.2.2 Sequence of the data values
Reg_H (Bit 15..0) Reg_L (Bit 31..16)
HByte LByte HByte LByte
1. 2. 3. 4.
Tab.9: Data type: 32-bit value
Reg_H (Bit 15..0) Reg_L (Bit 31..16) Reg_H (Bit 47..32) Reg_L (Bit 63..48)
HByte LByte HByte LByte HByte LByte HByte LByte
1. 2. 3. 4. 5. 6. 7. 8.
Tab.10: Data type: 64-bit value
5.2.3 Legend for the parameter tables
Address Start address of the data (=actual data address to be sent =register address minus 1)
Type Data type
oU = unsigned Integer (without sign)
oI = signed Integer (with sign)
o16 / 32 / 64 bits
Length Number of words (16 bits = 1 word)
DEC Correction factor for value calculation because the Modbus data definition only allows
integer values.
oDuring reading of the Modbus addresses the response values received by the program
(HMI) are divided by DEC.
oDuring writing of the Modbus addresses the response values to be sent by the program
(HMI) are multiplied by DEC.
(DEC = 10n; n = Number of decimal places)
Tab.11: Legend
Note The numbering of the register addresses starts at1, the data addressing at0. This is how e.g. when
reading register1 the data address0 is used.
5.2.4 Protected parameters
These parameters are set in the works and cannot be changed by the user.
Name Description Address Type Length DEC
Serial_Number Manufacturer-specific ID 0x00 U32 2 100
Device_ID Serial number processing unit 0x02 U32 2 100
Boot_Count Number of device starts 0x04 U16 1 100
Hardware Version hardware 0x05 U16 1 102
Software Version software 0x06 U16 1 102
Total_Volume_1 Total value, cannot be reset [l] 0x08 I64 4 103
Operation_hours Number of operating hours 0x0C U16 1 100
Tab.12: Protected parameters
8OIE 26en-GB Edition 2021-08 Operating instructions

5 Function description
5.2 Modbus communication
5.2.5 Automatically updated parameters
These parameters are automatically updated by the processing unit 16 times per second, meaning that
the updating interval for the Modbus data amounts to62.5ms.
Name Description Address Type Length DEC
Alarm_Read Error message 0x14 U32 2 100
Hold_Timer Sets the processing unit to Hold mode
for xms
0x16 U16 1 100
Total_Volume_2 Total value since last reset[l] 0x18 I64 4 103
Avg_Flow_Rate Average flow rate [l/h] 0x1C I32 2 102
Temperature Current temperature of the pumped
liquid[°C]
0x1E I16 1 101
Flow_Dir_Change Counter for direction change 0x1F U16 1 100
Tab.13: Automatically updated parameters
5.2.6 Parameters for configuration
These parameters are written by the user. They control the internal calculations of the processing unit.
Name Description Address Type Length DEC Value range
Modbus_baud_rate Modbus serial baud rate 0x30 U32 2 1009600, 19200, 38400,
56400, 115200
Flow_rate_max Maximum flow rate [l/h] 0x32 U32 2 102–
Flow_zero_threshold Threshold for flow rate 0.
When the value drops below this limit, the para-
meter "Avg_Flow_Rate" = 0 is set
0x34 U32 2 102–
X_Temperature Value for temperature compensation [°C] 0x36 I16 1 101-40.0 ... +200.0
Avg_Flow_Nb_
Samples
Number of measure samples for averaging 0x37 U16 1 100–
Flow_Metering_Mode Revaluation mode:
0 = Volume at X °C
1 = Volume without temperature compensation
2 = Volume as mass [kg]
0x38 U16 1 1000, 1, 2
Pulse_Type Mode of pulse input
0 = Encoder
1 = Counter
0x39 U16 1 1000, 1
Density_Determina-
tion
Mode of density determination:
0 = Automatic selection of the density table +
manual input of the density values
1 = Selection of Density table 1 + manual input of
the density values
2 = Selection of Density table 2 + manual input of
the density values
3 = Automatic selection of density calculation for
diesel or heavy fuel oil
4 = Density calculation for diesel
5 = Density calculation for heavy fuel oil
0x3A U16 1 1000, 1, 2, 3, 4, 5
Temperature_Switch Switching temperature ("Density_Determination" =
0 or 3):
oTemperature < "Temperature_Switch":
Selection of Density table 1
oTemperature ≥ "Temperature_Switch":
Selection of Density table 2
0x3B I16 1 101-40.0 ... +200.0
Density_Reference_1 Density of diesel at 15°C [kg/m3]
(Density_Determination = 3, 4 or 5)
0x3C U32 2 1010.1 ... 80000.0
Operating instructions OIE 26en-GB Edition 2021-08 9

5 Function description
5.2 Modbus communication
Name Description Address Type Length DEC Value range
Density_Reference_2 Density of heavy fuel oil at 15°C [kg/m3]
(Density_Determination = 3, 4 or 5)
0x3E U32 2 1010.1 ... 80000.0
Maintenance_Hours Number of operating hours until the required
maintenance
0x4A U16 1 100–
Tab.14: Parameters for configuration
5.2.7 K-factor table
Name Description Address Type Length DEC Value range
Frequency 1 Frequency 1 [Hz] 0x40 U32 2 1030.300 ... 2000.000
Frequency 2 Frequency 2 [Hz] 0x42 U32 2 1030.300 ... 2000.000
Frequency 3 Frequency 3 [Hz] 0x44 U32 2 1030.300 ... 2000.000
Frequency 4 Frequency 4 [Hz] 0x46 U32 2 1030.300 ... 2000.000
Frequency 5 Frequency 5 [Hz] 0x48 U32 2 1030.300 ... 2000.000
Frequency 6 Frequency 6 [Hz] 0x4A U32 2 1030.300 ... 2000.000
Frequency 7 Frequency 7 [Hz] 0x4C U32 2 1030.300 ... 2000.000
Frequency 8 Frequency 8 [Hz] 0x4E U32 2 1030.300 ... 2000.000
K-Factor 1 K-factor 1 [pulses/l] 0x50 U32 2 1031.000 ... 1000000.000
K-Factor 2 K-factor 2 [pulses/l] 0x52 U32 2 1031.000 ... 1000000.000
K-Factor 3 K-factor 3 [pulses/l] 0x54 U32 2 1031.000 ... 1000000.000
K-Factor 4 K-factor 4 [pulses/l] 0x56 U32 2 1031.000 ... 1000000.000
K-Factor 5 K-factor 5 [pulses/l] 0x58 U32 2 1031.000 ... 1000000.000
K-Factor 6 K-factor 6 [pulses/l] 0x5A U32 2 1031.000 ... 1000000.000
K-Factor 7 K-factor 7 [pulses/l] 0x5C U32 2 1031.000 ... 1000000.000
K-Factor 8 K-factor 8 [pulses/l] 0x5E U32 2 1031.000 ... 1000000.000
Tab.15: K-factor table
10 OIE 26en-GB Edition 2021-08 Operating instructions

5 Function description
5.2 Modbus communication
5.2.8 Density tables
Name Description Address Type Length DEC Value range
Temperature 1.1 Temperature 1 [°C] 0x60 I16 1 101-40.0 ... +200.0
Temperature 1.2 Temperature 2 [°C] 0x61 I16 1 101-40.0 ... +200.0
Temperature 1.3 Temperature 3 [°C] 0x62 I16 1 101-40.0 ... +200.0
Temperature 1.4 Temperature 4 [°C] 0x63 I16 1 101-40.0 ... +200.0
Temperature 1.5 Temperature 5 [°C] 0x64 I16 1 101-40.0 ... +200.0
Temperature 1.6 Temperature 6 [°C] 0x65 I16 1 101-40.0 ... +200.0
Temperature 1.7 Temperature 7 [°C] 0x66 I16 1 101-40.0 ... +200.0
Temperature 1.8 Temperature 8 [°C] 0x67 I16 1 101-40.0 ... +200.0
Temperature 1.9 Temperature 9 [°C] 0x68 I16 1 101-40.0 ... +200.0
Temperature 1.10 Temperature 10 [°C] 0x69 I16 1 101-40.0 ... +200.0
Density 1.1 Density 1 [kg/m3] 0x6A U32 2 1010.1 ... 80000.0
Density 1.2 Density 2 [kg/m3] 0x6C U32 2 1010.1 ... 80000.0
Density 1.3 Density 3 [kg/m3] 0x6E U32 2 1010.1 ... 80000.0
Density 1.4 Density 4 [kg/m3] 0x70 U32 2 1010.1 ... 80000.0
Density 1.5 Density 5 [kg/m3] 0x72 U32 2 1010.1 ... 80000.0
Density 1.6 Density 6 [kg/m3] 0x74 U32 2 1010.1 ... 80000.0
Density 1.7 Density 7 [kg/m3] 0x76 U32 2 1010.1 ... 80000.0
Density 1.8 Density 8 [kg/m3] 0x78 U32 2 1010.1 ... 80000.0
Density 1.9 Density 9 [kg/m3] 0x7A U32 2 1010.1 ... 80000.0
Density 1.10 Density 10 [kg/m3] 0x7C U32 2 1010.1 ... 80000.0
Tab.16: Parameters of Density table 1
Name Description Address Type Length DEC Value range
Temperature 2.1 Temperature 1 [°C] 0x7E I16 1 101-40.0 ... +200.0
Temperature 2.2 Temperature 2 [°C] 0x7F I16 1 101-40.0 ... +200.0
Temperature 2.3 Temperature 3 [°C] 0x80 I16 1 101-40.0 ... +200.0
Temperature 2.4 Temperature 4 [°C] 0x81 I16 1 101-40.0 ... +200.0
Temperature 2.5 Temperature 5 [°C] 0x82 I16 1 101-40.0 ... +200.0
Temperature 2.6 Temperature 6 [°C] 0x83 I16 1 101-40.0 ... +200.0
Temperature 2.7 Temperature 7 [°C] 0x84 I16 1 101-40.0 ... +200.0
Temperature 2.8 Temperature 8 [°C] 0x85 I16 1 101-40.0 ... +200.0
Temperature 2.9 Temperature 9 [°C] 0x86 I16 1 101-40.0 ... +200.0
Temperature 2.10 Temperature 10 [°C] 0x87 I16 1 101-40.0 ... +200.0
Density 2.1 Density 1 [kg/m3] 0x88 U32 2 1010.1 ... 80000.0
Density 2.2 Density 2 [kg/m3] 0x8A U32 2 1010.1 ... 80000.0
Density 2.3 Density 3 [kg/m3] 0x8C U32 2 1010.1 ... 80000.0
Density 2.4 Density 4 [kg/m3] 0x8E U32 2 1010.1 ... 80000.0
Density 2.5 Density 5 [kg/m3] 0x90 U32 2 1010.1 ... 80000.0
Density 2.6 Density 6 [kg/m3] 0x92 U32 2 1010.1 ... 80000.0
Density 2.7 Density 7 [kg/m3] 0x94 U32 2 1010.1 ... 80000.0
Density 2.8 Density 8 [kg/m3] 0x96 U32 2 1010.1 ... 80000.0
Density 2.9 Density 9 [kg/m3] 0x98 U32 2 1010.1 ... 80000.0
Density 2.10 Density 10 [kg/m3] 0x9A U32 2 1010.1 ... 80000.0
Tab.17: Parameters of Density table 2
Operating instructions OIE 26en-GB Edition 2021-08 11

5 Function description
5.2 Modbus communication
5.2.9 Error messages
No. Mask Error message Description
1 0x00000001 Alarm1 – K-factor table: Frequencies not in
ascending order
The frequency values in the K-factor table are not all
in ascending order.
2 0x00000002 Alarm2 – Density table: Temperatures not in
ascending order
The temperature values in one of the density tables
are not all in ascending order.
3 0x00000004 Alarm3 – Density table: Density values not in
descending order
The density values in one of the density tables are not
all in descending order.
5 0x00000010 Alarm5 – K-factor table: Frequency outside the
permissible range
At least one frequency value in the K-factor table lies
outside the permissible range.
6 0x00000020 Alarm6 – K-factor table: K-factor outside the
permissible range
At least one K-factor value in the K-factor table lies
outside the permissible range.
7 0x00000040 Alarm7 – Density table: Temperature outside the
permissible range
At least one temperature value in one of the density
tables lies outside the permissible range.
8 0x00000080 Alarm8 – Density table: Density outside the
permissible range
At least one density value in one of the density tables
lies outside the permissible range.
9 0x00000100 Alarm9 – Parameter X_Temperature outside the
permissible range
The value of the parameter "X_Temperature" lies
below-40°C or above200°C.
10 0x00000200 Alarm10 – Parameter Flow_Metering_Mode not
supported
Impermissible value of the parameter
"Flow_Metering_Mode". Possible values are:
0 = Volume at X °C
1 = Volume without temperature compensation
2 = Volume as mass [kg]
11 0x00000400 Alarm11 – Parameter Pulse_Type not supported Impermissible value of the parameter "Pulse_Type".
Possible values are:
0 = Encoder
1 = Counter
12 0x00000800 Alarm12 – Parameter Density_Determination not
supported
Impermissible value of the parameter
"Density_Determination". Possible values are:
0 = Automatic selection of the density table + manual
input of the density values
1 = Selection of Density table 1 + manual input of the
density values
2 = Selection of Density table 2 + manual input of the
density values
3 = Automatic selection of density calculation for
diesel or heavy fuel oil
4 = Density calculation for diesel
5 = Density calculation for heavy fuel oil
13 0x00001000 Alarm13 – Parameter Temperature_Switch outside
the valid range
The value of the parameter "Temperature_Switch" lies
below-40°C or above200°C.
14 0x00002000 Alarm14 – Parameter Density_Reference_... outside
the valid range
Impermissible reference value for density calculation
in Density table 1 or Density table 2.
17 0x00010000 Alarm17 - Maintenance required Limit value operating hours until required
maintenance is reached.
21 0x00100000 Alarm21 – Temperature outside the permissible
range
Currently measured temperature of the pumped liquid
lies below-40°C or above200°C.
22 0x00200000 Alarm22 – Temperature sensor faulty Failure or fault of the temperature sensor.
23 0x00400000 Alarm23 – Device temperature outside the
permissible range
The currently measured temperature of the
processing unit lies above105°C.
29 0x10000000 Alarm29 – Maximum flow rate exceeded The current flow rate exceeds the value of the
parameter "Flow_Rate_Max".
30 0x20000000 Alarm30 – Pick up faulty Failure or fault of a pick up.
31 0x40000000 Alarm31 – Maximum frequency exceeded The maximum permissible frequency of the pro-
cessing unit(4kHz) is exceeded.
32 0x80000000 Alarm32 – Device has been restarted Information message about automatic restart of the
processing unit.
Tab.18: Description of the error messages
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6 Transportation, storage
6.1 Unpacking and checking the state of delivery
5.2.10 Parameter for clearing error messages
This parameter can only be written by the user.
Name Description Address Type Length DEC
Alarm_Clear Clearing of an error message from the
parameter "Alarm_Read" (0x14) by
overwriting with the error-specific mask
(see Error messages)
0xC4 U32 2 100
Tab.19: Parameter for clearing error messages
6 Transportation, storage
6.1 Unpacking and checking the state of delivery
Personnel qualification: oTrained personnel
1. Upon delivery check the product for damage during transportation.
2. Report damage during transportation immediately to the manufacturer.
3. Dispose of packing material in accordance with the locally applicable regulations.
6.2 Transporting the electronic unit
Transport the electronic unit in the original packaging. Observe ambient conditions in the process
Ä Technical data,Page5.
6.3 Storing the electronic unit
Store the electronic unit in the original packaging in a cool and dry place. Observe ambient condi-
tions in the process Ä Technical data,Page5.
Operating instructions OIE 26en-GB Edition 2021-08 13

7 Installation, removal
7.1 Dangers during installation, removal
7 Installation, removal
7.1 Dangers during installation, removal
The following safety instructions must be strictly observed:
oHave all work only carried out by electricians.
oDo not take apart the electronic unit.
7.2 Installing the processing unit
One processing unit is assigned to exactly one flowmeter. The serial numbers of the processing unit
and of the assigned flowmeter are specified on the rating plate of the processing unit Ä Identifica-
tion,Page4.
The processing unit is mounted directly on the flowmeter.
For information on installing the processing unit please refer to the associated operating instructions of
the flowmeter.
7.3 Removing the processing unit
For information on removing the processing unit please refer to the associated operating instructions of
the flowmeter.
8 Connection
8.1 Dangers during connection work
The following safety instructions must be observed:
oHave all work only carried out by electricians.
8.2 Connecting the processing unit
A maximum of 32 processing units can be connected in series. Modbus communication and power
supply are effected through a cable. The Modbus input of the last processing unit has to be terminated
with a terminating resistor.
4
32
1
5
4
32
1
5
MODBUS IN MODBUS OUT
Fig.5: Pin assignment
Pin Description
1 Shield
2 DC power supply 10–30 V (+)
3 DC power supply 0 V (- or GND)
4 RS-485 A / + / RXTX-P (positive)
5 RS-485 B / – / RXTX-N (negative) / inverted
Tab.20: Pin assignment
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8 Connection
8.2 Connecting the processing unit
1
4
C1
C2
5
6
Fig.6: Connecting one processing unit
123
4
C1
C2
5
6
Fig.7: Connecting several processing units
1Flowmeter with processing unit 5Display device (HMI)
2Flowmeter with processing unit 6Power supply display device
3Flowmeter with processing unit C1 Power supply processing unit
4Terminating resistor C2 Connection Modbus RS-485
Requirement:
üModbus cable available for all the connections
1. Connect the Modbus output (MODBUS OUT) of the first processing unit with the display device.
2. Terminate the Modbus input (MODBUS IN) of the last processing unit with the terminating
resistor.
3. When connecting several processing units in series connect the output of a processing unit with
the input of the next processing unit.
Operating instructions OIE 26en-GB Edition 2021-08 15

9 Operation
9.1 Carrying out the basic settings
9 Operation
9.1 Carrying out the basic settings
9.1.1 Setting the Modbus address
Modbus addressing is effected by means of two address selector switches on the circuit board of the
processing unit.
X10 X1
5
7
9
6
0
8
1
2
3
4
5
7
9
6
0
8
1
2
3
4
Fig.8: Modbus addressing
1. Remove the cover of the processing unit.
2. Set the Modbus address via the address selector switchesX10 andX1.
Example: For the Modbus address27 set the address selector switchX10 to2 and the address
selector switchX1 to7.
9.1.2 Managing the density table
Parameter "Density_Determination"
The processing unit offers several possibilities of managing density calculation with the parameter
"Density_Determination".
Two density tables for two different pumped liquids can be stored in the processing unit for the case
that the plant is operated with two pumped liquids. If the plant is operated with only one pumped liquid,
only one density table is used.
Density determination through Modbus value
Automatic selection of the density table at manual input of the density values (no
density calculation as in Modes3,4,5)
0
Selection of Density table1 1
Selection of Density table2 2
Automatic selection of density calculation for diesel or heavy fuel oil 3
Density calculation for diesel (LDO/MDO) 4
Density calculation for heavy fuel oil (HFO) 5
Tab.21: Parameter "Density_Determination"
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9 Operation
9.1 Carrying out the basic settings
Entering density values manually
Density values and temperature values can be entered manually.
Set the parameter "Density_Determination" to 0, 1 or 2 and enter density values.
Having density values calculated
In the case of fuel oils the temperature-dependent density values can be calculated automatically from
a reference value. The density calculation is implemented in accordance with PTB and DIN 51757 Pro-
cessB for fuel oils.
Set the parameter "Density_Determination" to3,4 or5.
ðThe processing unit calculates the density values by using the reference values:
Density table1 with parameter "Reference_Density_1"
Density table2 with parameter "Reference_Density_2"
Note After a changeover to calculated density values the processing unit has to be restarted.
Having a density table selected
In the case of operation with two different pumped liquids, for example diesel and heavy fuel oil, the se-
lection of the associated density table can be carried out automatically. To this purpose the current
temperature of the pumped liquid is compared with the value of the parameter "Temperature_Switch".
For automatic selection of the density table set the parameter "Density_Determination" to0 or3.
ðThe processing unit compares the currently measured temperature of the pumped liquid with the
parameter "Temperature_Switch" and selects the density table:
Selection of Density table1 if the temperature is lower than "Temperature_Switch"
Selection of Density table2 if the temperature is higher than or equal to "Temperature_Switch"
Selecting Density table 1
To select Density table 1 set the parameter "Density_Determination" to 1 or 4.
Selecting Density table 2
To select Density table 2 set the parameter "Density_Determination" to 2 or 5.
9.1.3 Entering the density table
The processing unit manages two density tables for two different pumped liquids. The temperature-de-
pendent density values of a pumped liquid are stored in a density table. The calculation of the flow rate
at a reference temperature is carried out with the stored values.
If the plant is operated with only one pumped liquid, only one density table is used.
Address Parameter Unit Length Number of
decimal
places
Explanation Data type
0x60 ...
0x69
Temperature 1.1 ...
Temperature 1.10
[°C] 1 1 Value x 10 I16
0x6A ...
0x7C
Density 1.1 ...
Density 1.10
[kg/m3] 2 1 Value x 10 U32
Tab.22: Parameters of Density table 1
1. Enter the value times10 in the parameters "Temperature1.1" to "Temperature1.10".
Example: Entry125 means12.5°C.
2. Enter the value times10 in the parameters "Density 1.1" to "Density 1.10".
Example: Entry8513 means851.3kg/m3.
Operating instructions OIE 26en-GB Edition 2021-08 17

9 Operation
9.1 Carrying out the basic settings
9.1.4 Selecting the mode for volume measurement
The parameter "Flow_Metering_Mode" is used to control the form in which the processing unit outputs
the measured volumes. Three modes are available.
Value Description
0 Pure measured value, without correction
1 Measured value with temperature compensation
2 Measured value converted into mass [kg]
Tab.23: Parameter "Flow_Metering_Mode"
Set the parameter "Flow_Metering_Mode" to0,1 or2.
9.1.5 Specifying the reference temperature for temperature compensation
The parameter "X_Temperature" is used for correction calculation of the density. This correction is
called temperature compensation.
The current density of the pumped liquid is calculated by means of the measured temperature of the
flowing pumped liquid and of the stored density table. This ensures that measuring errors caused by
changes in the density due to temperature variations are avoided.
Value Description
15 Reference temperature [°C] for correction calculation of the density values
(standard value = 15°C)
Tab.24: Parameter "X_Temperature"
Enter the reference temperature in the parameter "X_Temperature".
9.1.6 Smoothing the indication
A strongly fluctuating flow rate causes the jumping display values, making an interpretation by the user
difficult. The averaging function reduces this effect by generating an averaging across several meas-
ured values.
The following table shows how the number of measured values used for average-value generation af-
fects the response time. The response time is defined as that time in which a jumping change of the
pick up frequency (=flow rate) is mapped completely in the parameter "Avg_Flow_Rate".
Number of measured values for averaging Response time [s]
0 or 1 1/16
2 1/8
16 1
100 10
200 20
500 50
1000 100
Tab.25: Parameter "Avg_Flow_Nb_Samples"
Enter the number of measured values for averaging in the parameter "Avg_Flow_Nb_Samples".
9.1.7 Selecting the mode for pulse evaluation
Recognition of the flow direction is controlled via the parameter "Pulse_Type". Two modes are avail-
able.
Value Description
0 Encoder mode:
The processing unit evaluates two pick ups which allows it to recognize the flow direction.
1 Counter mode:
The processing unit evaluates only one pick up. A recognition of the flow direction is not
possible.
Tab.26: Parameter "Pulse_Type"
Set the parameter "Pulse_Type" to0 or1.
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9 Operation
9.2 Reading the measured values and status information
9.1.8 Specifying the maximum flow rate
The maximum flow rate in [l/h] is specified by using the parameter "Maximum_Flow_Rate". If the cur-
rent flow rate exceeds the value specified in the parameter, an error message is output, see
"Alarm 29".
Enter the desired value times 100 in the parameter "Maximum_Flow_Rate".
Example: The entry 35500 corresponds to 355.00 l/h.
9.1.9 Specifying the minimum flow rate
The minimum flow rate in[l/h] is specified by using the parameter "Flow_Zero_Threshold".
This ensures that the flow rate changes to zero after a defined period(1/fug), irrespective of its aver-
aging. If the flow lies below this limit, the average flow rate is set to zero. However, the volume or mass
respectively continues to be taken into consideration for the calculation of the total values.
If zero is entered as the limit, the average flow rate only changes to zero after a certain delay. The dur-
ation of this delay corresponds to the reaction time of the averaging.
Enter the desired value times100 in the parameter "Flow_Zero_Threshold".
Example: The entry5 corresponds to 0.05l/h.
9.2 Reading the measured values and status information
9.2.1 Synchronizing measured values
Synchronization between the measurements in the feed and return lines is advisable for the differential
measurement. A waiting mode is available to this purpose. This is controlled via the parameter
"Hold_Timer". At an activated waiting mode the current measured values, meaning the automatically
updated parameters, are frozen for a specified waiting period.
Activating the waiting mode for one processing unit
Enter the waiting period in [ms] in the parameter "Hold_Timer".
ðThe counter immediately begins to count down. The remaining period of the waiting mode is
entered in the parameter "Hold_Timer". The measured values continue to be updated internally dur-
ing the waiting period.
Activating the waiting mode for several processing units
Enter the Modbus address 0 and the waiting period in [ms] in the parameter "Hold_Timer".
ðThe parameters "Alarm_Read", "Total_Volume_2", "Avg_Flow_Rate", "Temperature" and
"Flow_Dir_Change" are read.
Deactivating the waiting mode
Enter the waiting period 0 in the parameter "Hold_Timer".
Increasing the waiting period
Before the counter has reached the value zero, enter a new waiting period in [ms] in the para-
meter "Hold_Timer".
Example:
One set of measured values is to be read per second in a flow rate measuring system with one flow-
meter each in the feeder and return line.
1. Enter a waiting period of 500ms and the Modbus address0 in the parameter "Hold_Timer" so
that both processing units can be set simultaneously into the waiting mode.
The waiting period can be selected freely. A waiting period of500ms is sufficient so that the cur-
rent measured values of the two flowmeters can be read and have expired before the next read-
ing.
2. Read the measured values from Processing unit 1.
ðRead the parameters "Alarm_Read", "Total_Volume_2", "Avg_Flow_Rate", "Temperature" and
"Flow_Dir_Change" of Processing unit 1.
3. Read the measured values from Processing unit 2.
ðRead the parameters "Alarm_Read", "Total_Volume_2", "Avg_Flow_Rate", "Temperature" and
"Flow_Dir_Change" of Processing unit 2.
4. Calculate the quantity and difference of the flow rates.
ðThe waiting mode ends automatically after500ms.
Operating instructions OIE 26en-GB Edition 2021-08 19

10 Maintenance
10.1 Required maintenance
9.2.2 Clearing error messages
Error messages are stored in the parameter "Alarm_Read". Individual, several or all the error
messages can be cleared.
The parameter "Alarm_Clear" is used to clear error messages. The parameter has to be written with
the mask assigned to the error message. The masks of the individual error messages have to be
added to clear several error messages.
Cleaning an error message
Enter the error message in the parameter "Alarm_Clear".
Example: Error message 3 is to be cleared.
Enter 0x00000004 for Error message 3 in the parameter "Alarm_Clear".
ðIf the cause of the error message is not eliminated, the corresponding value is retained in the para-
meter "Alarm_Read".
Clearing several error messages
Enter the total of the masks of the error messages in the parameter "Alarm_Clear".
Example: Error messages 3 and 32 are to be cleared.
Enter 0x10000004 (= 0x00000004 for Error message 3 + 0x10000000 for Error message 32) in
the parameter "Alarm_Clear".
ðIf the causes of the error messages are not eliminated, the corresponding value is retained in the
parameter "Alarm_Read".
Clearing all the error messages
Enter the mask 0xFFFFFFFF in the parameter "Alarm_Clear".
ðIf the causes of the error messages are not eliminated, the corresponding value is retained in the
parameter "Alarm_Read".
10 Maintenance
10.1 Required maintenance
The electronic unit is maintenance-free.
10.2 Cleaning the electronic unit
ATTENTION
Device damage through water.
► Ensure that no water enters the electronic unit.
Wipe the housing with a soft cloth. In the case of strong soiling wipe off the housing surface
slightly moist with a common detergent.
20 OIE 26en-GB Edition 2021-08 Operating instructions