Endress+Hauser MODBUS RS485 User manual

Products Solutions Services
Operating Instructions
Dosimag
Modbus RS485
Electromagnetic flowmeter
BA01321D/06/EN/03.17
71349516
Valid as of version
03.00.zz (Device firmware)

Dosimag Modbus RS485
2 Endress+Hauser
• Make sure the document is stored in a safe place such that it is always available when
working on or with the device.
• To avoid danger to individuals or the facility, read the "Basic safety instructions" section
carefully, as well as all other safety instructions in the document that are specific to
working procedures.
• The manufacturer reserves the right to modify technical data without prior notice. Your
Endress+Hauser Sales Center will supply you with current information and updates to
these instructions.

Dosimag Modbus RS485 Table of contents
Endress+Hauser 3
Table of contents
1 Document information .............. 5
1.1 Document function ..................... 5
1.2 Symbols used .......................... 5
1.2.1 Safety symbols .................. 5
1.2.2 Electrical symbols ................ 5
1.2.3 Symbols for certain types of
information .................... 5
1.2.4 Symbols in graphics ............... 6
1.3 Documentation ........................ 6
1.3.1 Standard documentation ........... 7
1.3.2 Supplementary device-dependent
documentation .................. 7
1.4 Registered trademarks ................... 7
2 Basic safety instructions ............ 8
2.1 Requirements for the personnel ............ 8
2.2 Designated use ........................ 8
2.3 Workplace safety ....................... 9
2.4 Operational safety ...................... 9
2.5 Product safety ......................... 9
2.6 IT security ............................ 9
3 Product description ................ 11
3.1 Product design ........................ 11
4 Incoming acceptance and product
identification ..................... 12
4.1 Incoming acceptance ................... 12
4.2 Product identification ................... 12
4.2.1 Sensor nameplate ............... 13
4.2.2 Symbols on measuring device ...... 14
5 Storage and transport ............. 15
5.1 Storage conditions ..................... 15
5.2 Transporting the product ................ 15
5.3 Packaging disposal ..................... 15
6 Installation ....................... 16
6.1 Installation conditions .................. 16
6.1.1 Mounting position ............... 16
6.1.2 Requirements from environment and
process ....................... 19
6.1.3 Special mounting instructions ...... 20
6.2 Mounting the measuring device ........... 21
6.2.1 Required tools .................. 21
6.2.2 Preparing the measuring device ..... 21
6.2.3 Mounting the measuring device ..... 22
6.2.4 Welding the sensor into the pipe
(welding connections) ............ 22
6.2.5 Cleaning with pigs ............... 22
6.2.6 Seals ......................... 23
6.2.7 Nominal diameter and flow ........ 23
6.3 Post-installation check .................. 23
7 Electrical connection .............. 24
7.1 Connection conditions .................. 24
7.1.1 Requirements for connecting cable ... 24
7.1.2 Terminal assignment ............. 24
7.1.3 Pin assignment, device plug ........ 25
7.1.4 Requirements for the supply unit .... 28
7.2 Connecting the measuring device .......... 28
7.2.1 Connecting the transmitter ........ 28
7.3 Ensuring the degree of protection .......... 28
7.4 Post-connection check .................. 29
8 Operation options ................. 30
8.1 Overview of operation options ............ 30
8.2 Access to the operating menu via the
operating tool ........................ 30
8.2.1 Connecting the operating tool ...... 30
8.2.2 FieldCare ..................... 31
8.2.3 DeviceCare .................... 32
9 System integration ................ 33
9.1 Overview of device description files ......... 33
9.1.1 Current version data for the device ... 33
9.1.2 Operating tools ................. 33
9.2 Modbus RS485 information .............. 33
9.2.1 Function codes ................. 33
9.2.2 Register information ............. 34
9.2.3 Response time .................. 34
9.2.4 Modbus data map ............... 34
10 Commissioning .................... 37
10.1 Function check ....................... 37
10.2 Switching on the measuring device ......... 37
10.3 Establishing a connection via FieldCare ...... 37
10.4 Configuring the measuring device .......... 37
10.4.1 Defining the tag name ............ 38
10.4.2 Setting the system units .......... 38
10.4.3 Configuring the status input ....... 38
10.4.4 Configuring the switch output
(batch) ....................... 39
10.4.5 Configuring the communication
interface ...................... 41
10.4.6 Low flow cut off ................ 42
10.5 Advanced settings ..................... 42
10.5.1 Sensor adjustment ............... 43
10.5.2 Configuring the totalizer .......... 43
10.6 Simulation ........................... 44
11 Operation ......................... 45
11.1 Reading device locking status ............. 45

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11.2 Reading access authorization status on
operating software ..................... 45
11.3 Reading measured values ................ 45
11.3.1 Process variables ................ 45
11.3.2 Totalizer ...................... 46
11.3.3 Input values ................... 46
11.4 Performing a totalizer reset .............. 47
11.5 Batching control ...................... 48
12 Diagnostics and troubleshooting ... 50
12.1 General troubleshooting ................. 50
12.2 Diagnostic information in FieldCare ........ 50
12.2.1 Diagnostic options ............... 50
12.2.2 Calling up remedy information ...... 51
12.3 Diagnostic information via communication
interface ............................ 52
12.3.1 Reading out diagnostic information .. 52
12.3.2 Configuring error response mode .... 52
12.4 Adapting the diagnostic information ....... 52
12.4.1 Adapting the diagnostic behavior .... 52
12.5 Overview of diagnostic information ........ 53
12.6 Pending diagnostic events ............... 54
12.7 Diagnostic list ........................ 55
12.8 Event logbook ........................ 55
12.8.1 Event history ................... 55
12.8.2 Filtering the event logbook ........ 55
12.8.3 Overview of information events ..... 56
12.9 Resetting the measuring device ........... 56
12.10 Device information .................... 56
12.11 Firmware history ...................... 58
13 Maintenance ...................... 59
13.1 Maintenance tasks ..................... 59
13.1.1 Exterior cleaning ................ 59
13.1.2 Interior cleaning ................ 59
13.1.3 Replacing seals ................. 59
13.2 Measuring and test equipment ............ 59
13.3 Endress+Hauser services ................ 59
14 Repair ............................ 60
14.1 General notes ........................ 60
14.2 Spare parts .......................... 60
14.3 Endress+Hauser services ................ 60
14.4 Return .............................. 60
14.5 Disposal ............................ 60
14.5.1 Removing the measuring device ..... 60
14.5.2 Disposing of the measuring device ... 61
15 Accessories ....................... 62
15.1 Device-specific accessories ............... 62
15.1.1 For the sensor .................. 62
15.2 Communication-specific accessories ........ 62
15.3 Service-specific accessories ............... 63
16 Technical data .................... 64
16.1 Application .......................... 64
16.2 Function and system design .............. 64
16.3 Input ............................... 64
16.4 Output ............................. 65
16.5 Power supply ......................... 67
16.6 Performance characteristics .............. 67
16.7 Installation .......................... 68
16.8 Environment ......................... 68
16.9 Process ............................. 69
16.10 Mechanical construction ................ 70
16.11 Operability .......................... 72
16.12 Certificates and approvals ............... 73
16.13 Accessories .......................... 74
16.14 Supplementary documentation ............ 74
Index .................................. 76

Dosimag Modbus RS485 Document information
Endress+Hauser 5
1 Document information
1.1 Document function
These Operating Instructions contain all the information that is required in various phases
of the life cycle of the device: from product identification, incoming acceptance and
storage, to mounting, connection, operation and commissioning through to
troubleshooting, maintenance and disposal.
1.2 Symbols used
1.2.1 Safety symbols
Symbol Meaning
DANGER
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will
result in serious or fatal injury.
WARNING
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in serious or fatal injury.
CAUTION
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in minor or medium injury.
NOTICE
NOTE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.2.2 Electrical symbols
Symbol Meaning
Direct current
Alternating current
Direct current and alternating current
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Protective ground connection
A terminal which must be connected to ground prior to establishing any other
connections.
Equipotential connection
A connection that has to be connected to the plant grounding system: This may be a
potential equalization line or a star grounding system depending on national or
company codes of practice.
1.2.3 Symbols for certain types of information
Symbol Meaning
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred.

Document information Dosimag Modbus RS485
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Symbol Meaning
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation
A
Reference to page
Reference to graphic
Notice or individual step to be observed
1.
,
2.
,
3.
… Series of steps
Result of a step
Help in the event of a problem
Visual inspection
1.2.4 Symbols in graphics
Symbol Meaning
1, 2, 3,... Item numbers
1.
,
2.
,
3.
… Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
-
Hazardous area
.
Safe area (non-hazardous area)
Flow direction
1.3 Documentation
For an overview of the scope of the associated Technical Documentation, refer to the
following:
• The W@M Device Viewer : Enter the serial number from the nameplate
(www.endress.com/deviceviewer)
• The Endress+Hauser Operations App: Enter the serial number from the nameplate
or scan the 2-D matrix code (QR code) on the nameplate.
For a detailed list of the individual documents along with the documentation code

Dosimag Modbus RS485 Document information
Endress+Hauser 7
1.3.1 Standard documentation
Document type Purpose and content of the document
Technical Information Planning aid for your device
The document contains all the technical data on the device and provides
an overview of the accessories and other products that can be ordered for
the device.
Sensor Brief Operating Instructions Guides you quickly to the 1st measured value - Part 1
The Sensor Brief Operating Instructions are aimed at specialists with
responsibility for installing the measuring device.
• Incoming acceptance and product identification
• Storage and transport
• Installation
Transmitter Brief Operating
Instructions
Guides you quickly to the 1st measured value - Part 2
The Transmitter Brief Operating Instructions are aimed at specialists with
responsibility for commissioning, configuring and parameterizing the
measuring device (until the first measured value).
• Product description
• Installation
• Electrical connection
• Operation options
• System integration
• Commissioning
• Diagnostic information
Description of Device Parameters Reference for your parameters
The document provides a detailed explanation of each individual
parameter in the Expert operating menu. The description is aimed at
those who work with the device over the entire life cycle and perform
specific configurations.
The document provides Modbus-specific information for each individual
parameter in the Expert operating menu.
1.3.2 Supplementary device-dependent documentation
Additional documents are supplied depending on the device version ordered: Always
comply strictly with the instructions in the supplementary documentation. The
supplementary documentation is an integral part of the device documentation.
1.4 Registered trademarks
Modbus®
Registered trademark of SCHNEIDER AUTOMATION, INC.
TRI-CLAMP®
Registered trademark of Ladish & Co., Inc., Kenosha, USA
Applicator®, FieldCare®, DeviceCare ®
Registered or registration-pending trademarks of the Endress+Hauser Group

Basic safety instructions Dosimag Modbus RS485
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2 Basic safety instructions
2.1 Requirements for the personnel
The personnel for installation, commissioning, diagnostics and maintenance must fulfill
the following requirements:
‣Trained, qualified specialists must have a relevant qualification for this specific function
and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Before beginning work, the specialist staff must have read and understood the
instructions in the Operating Instructions and supplementary documentation as well as
in the certificates (depending on the application)
‣Following instructions and basic conditions
The operating personnel must fulfill the following requirements:
‣Being instructed and authorized according to the requirements of the task by the
facility's owner-operator
‣Following the instructions in these Operating Instructions
2.2 Designated use
Application and media
Depending on the version ordered, the measuring device can also measure potentially
explosive, flammable, poisonous and oxidizing media.
Measuring devices for use in hazardous areas, in hygienic applications or in applications
where there is an increased risk due to process pressure, are labeled accordingly on the
nameplate.
To ensure that the measuring device remains in proper condition for the operation time:
‣Only use the measuring device in full compliance with the data on the nameplate and
the general conditions listed in the Operating Instructions and supplementary
documentation.
‣Check the nameplate to verify if the device ordered can be put to its intended use in the
approval-related area (e.g. explosion protection, pressure vessel safety).
‣Use the measuring device only for media against which the process-wetted materials
are adequately resistant.
‣If the measuring device is not operated at atmospheric temperature, compliance with
the relevant basic conditions specified in the associated device documentation is
absolutely essential: "Documentation" section →  6.
‣Protect the measuring device permanently against corrosion from environmental
influences.
Incorrect use
Non-designated use can compromise safety. The manufacturer is not liable for damage
caused by improper or non-designated use.
LWARNING
Danger of breakage of the sensor due to corrosive or abrasive fluids or from
environmental conditions!
‣Verify the compatibility of the process fluid with the sensor material.
‣Ensure the resistance of all fluid-wetted materials in the process.
‣Keep within the specified pressure and temperature range.
Verification for borderline cases:
‣For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance
in verifying the corrosion resistance of fluid-wetted materials, but does not accept any

Dosimag Modbus RS485 Basic safety instructions
Endress+Hauser 9
warranty or liability as minute changes in the temperature, concentration or level of
contamination in the process can alter the corrosion resistance properties.
Residual risks
The external surface temperature of the housing can increase by max. 10 K due to the
power consumption of the electronic components. Hot process fluids passing through the
measuring device will further increase the surface temperature of the housing. The surface
of the sensor, in particular, can reach temperatures which are close to the fluid
temperature.
Possible burn hazard due to fluid temperatures!
‣For elevated fluid temperature, ensure protection against contact to prevent burns.
2.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
For welding work on the piping:
‣Do not ground the welding unit via the measuring device.
If working on and with the device with wet hands:
‣It is recommended to wear gloves on account of the higher risk of electric shock.
2.4 Operational safety
Risk of injury.
‣Operate the device in proper technical condition and fail-safe condition only.
‣The operator is responsible for interference-free operation of the device.
Conversions to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
‣If, despite this, modifications are required, consult with Endress+Hauser.
Repair
To ensure continued operational safety and reliability,
‣Carry out repairs on the device only if they are expressly permitted.
‣Observe federal/national regulations pertaining to repair of an electrical device.
‣Use original spare parts and accessories from Endress+Hauser only.
2.5 Product safety
This measuring device is designed in accordance with good engineering practice to meet
state-of-the-art safety requirements, has been tested, and left the factory in a condition in
which it is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser
confirms this by affixing the CE mark to the device.
2.6 IT security
We only provide a warranty if the device is installed and used as described in the
Operating Instructions. The device is equipped with security mechanisms to protect it
against any inadvertent changes to the device settings.

Basic safety instructions Dosimag Modbus RS485
10 Endress+Hauser
IT security measures in line with operators' security standards and designed to provide
additional protection for the device and device data transfer must be implemented by the
operators themselves.

Dosimag Modbus RS485 Product description
Endress+Hauser 11
3 Product description
The device consists of a transmitter and a sensor.
The device is available as a compact version:
The transmitter and sensor form a mechanical unit.
3.1 Product design
1
2
A0026624
 1 Important components of the measuring device
1 Transmitter
2 Sensor

Incoming acceptance and product identification Dosimag Modbus RS485
12 Endress+Hauser
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
A0028673
1
2
1
2
Are the order codes on the
delivery note (1) and the
product sticker (2) identical?
A0028673
Are the goods undamaged?
A0028673
Order code:
Ser. no.:
Ext. ord. cd.:
ii
Date:
Do the nameplate data
match the ordering
information on the delivery
note?
A0028673
Is the CD-ROM with the
Technical Documentation
(depends on device version)
and documents present?
• If one of the conditions is not satisfied, contact your Endress+Hauser Sales Center.
• Depending on the device version, the CD-ROM might not be part of the delivery!
The Technical Documentation is available via the Internet or via the Endress+Hauser
Operations App, see the "Product identification" section →  13.
4.2 Product identification
The following options are available for identification of the measuring device:
• Nameplate specifications
• Order code with breakdown of the device features on the delivery note
• Enter serial numbers from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer): All information about the measuring device is
displayed.
• Enter the serial number from the nameplates into the Endress+Hauser Operations App
or scan the 2-D matrix code (QR code) on the nameplate with the Endress+Hauser
Operations App: all the information for the measuring device is displayed.

Dosimag Modbus RS485 Incoming acceptance and product identification
Endress+Hauser 13
For an overview of the scope of the associated Technical Documentation, refer to the
following:
• The chapters "Additional standard documentation on the device" →  7 and
"Supplementary device-dependent documentation" →  7
• The W@M Device Viewer: Enter the serial number from the nameplate
(www.endress.com/deviceviewer)
• The Endress+Hauser Operations App: Enter the serial number from the nameplate or
scan the 2-D matrix code (QR code) on the nameplate.
4.2.1 Sensor nameplate
Ta:
Materials:
Tm:
Order Code:
TAG no.:
Ser. no.:
Ta+20°C/36°F
Dosimag
For installation and temp.
marking see control dwgs.
i
2
4
5
6
7
8
9
3
13
10
11
12
1
A0003822
 2 Example of sensor nameplate
1 Manufacturing location
2 Order code: see the specifications on the order confirmation for the meanings of the individual letters and
digits
3 Serial number
4 Supply voltage and power consumption
5 Process connection
6 Wetted materials
7 Maximum process temperature
8 Permitted ambient temperature range
9 Space reserved for additional information on the device version (approvals, certificates, etc.)
10 Degree of protection
11 Flow direction
12 Cable temperature
13 Space reserved for additional information on the device version (approvals, certificates, etc.)
Order code
The measuring device is reordered using the order code.
Extended order code
• The device type (product root) and basic specifications (mandatory features) are
always listed.
• Of the optional specifications (optional features), only the safety and approval-
related specifications are listed (e.g. LA). If other optional specifications are also
ordered, these are indicated collectively using the # placeholder symbol (e.g. #LA#).
• If the ordered optional specifications do not include any safety and approval-related
specifications, they are indicated by the + placeholder symbol (e.g. XXXXXX-ABCDE
+).

Incoming acceptance and product identification Dosimag Modbus RS485
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4.2.2 Symbols on measuring device
Symbol Meaning
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious
or fatal injury.
Reference to documentation
Refers to the corresponding device documentation.
Protective ground connection
A terminal which must be connected to ground prior to establishing any other connections.

Dosimag Modbus RS485 Storage and transport
Endress+Hauser 15
5 Storage and transport
5.1 Storage conditions
Observe the following notes for storage:
• Store in the original packaging to ensure protection from shock.
• Do not remove protective covers or protective caps installed on process connections.
They prevent mechanical damage to the sealing surfaces and contamination in the
measuring tube.
• Protect from direct sunlight to avoid unacceptably high surface temperatures.
• Select a storage location where moisture cannot collect in the measuring device as
fungus and bacteria infestation can damage the lining.
• Store in a dry and dust-free place.
• Do not store outdoors.
Storage temperature→  68
5.2 Transporting the product
Transport the measuring device to the measuring point in the original packaging.
Do not remove protective covers or caps installed on process connections. They
prevent mechanical damage to the sealing surfaces and contamination in the
measuring tube.
5.3 Packaging disposal
All packaging materials are environmentally friendly and 100% recyclable:
• Measuring device secondary packaging: polymer stretch film that conforms to EC
Directive 2002/95/EC (RoHS).
• Packaging:
– Wood crate, treated in accordance with ISPM 15 standard, which is confirmed by the
affixed IPPC logo.
or
– Carton in accordance with European Packaging Directive 94/62EC; recyclability is
confirmed by the affixed RESY symbol.
• Seaworthy packaging (optional): Wood crate, treated in accordance with ISPM 15
standard, which is confirmed by the affixed IPPC logo.
• Carrying and mounting hardware:
– Disposable plastic pallet
– Plastic straps
– Plastic adhesive strips
• Dunnage: Paper cushion

Installation Dosimag Modbus RS485
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6 Installation
6.1 Installation conditions
6.1.1 Mounting position
Mounting location
h
A0029343
Preferably install the sensor in an ascending pipe, and ensure a sufficient distance to the
next pipe elbow: h ≥ 2 × DN
Installation in down pipes
Install a siphon with a vent valve downstream of the sensor in down pipes whose length h
≥ 5 m (16.4 ft). This precaution is to avoid low pressure and the consequent risk of
damage to the measuring tube. This measure also prevents the system losing prime.
h
2
1
A0028981
 3 Installation in a down pipe
1 Vent valve
2 Pipe siphon
h Length of down pipe
Installation in partially filled pipes
A partially filled pipe with a gradient necessitates a drain-type configuration.
2 x DN³
5 x DN³
A0029257

Dosimag Modbus RS485 Installation
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Orientation
The direction of the arrow on the sensor nameplate helps you to install the sensor
according to the flow direction (direction of medium flow through the piping).
Orientation Recommendation
AVertical orientation
A0015591
BHorizontal orientation, transmitter at
top
A0015589
1)
CHorizontal orientation, transmitter at
bottom
A0015590
2) 3)
DHorizontal orientation, transmitter at
side
A0015592
1) Applications with low process temperatures may decrease the ambient temperature. To maintain the
minimum ambient temperature for the transmitter, this orientation is recommended.
2) Applications with high process temperatures may increase the ambient temperature. To maintain the
maximum ambient temperature for the transmitter, this orientation is recommended.
3) To prevent the electronics module from overheating in the case of a sharp rise in temperature (e.g. CIP- or
SIP processes), install the device with the transmitter component pointing downwards.
Horizontal
11
A0025817
1 Measuring electrodes for signal detection
Ideally, the measuring electrode plane should be horizontal. This prevents brief
insulation of the two measuring electrodes by entrained air bubbles.
Valves
Never install the sensor downstream from a filling valve. If the sensor is completely empty
this corrupts the measured value.
Correct measurement is only possible if the pipe is completely full. Perform sample
fillings before commencing filling in production.

Installation Dosimag Modbus RS485
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1
2
2
1
3 3
A0003768
1 Measuring device
2 Filling valve
3 Container
Filling systems
The pipe system must be completely full to ensure optimum measurement.
1212
1
2
3 3 3
A0003795
 4 Filling system
1 Measuring device
2 Filling valve
3 Container
Inlet and outlet runs
If possible, install the sensor upstream from fittings such as valves, T-pieces or elbows.
Observe the following inlet and outlet runs to comply with accuracy specifications:
≥ 5 x DN ≥ 2 x DN
A0028997

Dosimag Modbus RS485 Installation
Endress+Hauser 19
Installation dimensions
For the dimensions and installation lengths of the device, see the "Technical
Information" document, "Mechanical construction" section.
6.1.2 Requirements from environment and process
Ambient temperature range
Transmitter –40 to +60 °C (–40 to +140 °F)
Sensor –40 to +60 °C (–40 to +140 °F)
Liner Do not exceed or fall below the permitted temperature range of the liner
→  69.
Temperature tables
Observe the interdependencies between the permitted ambient and fluid
temperatures when operating the device in hazardous areas.
For detailed information on the temperature tables, see the separate document
entitled "Safety Instructions" (XA) for the device.
System pressure
A0028777
Never install the sensor on the pump suction side in order to avoid the risk of low pressure,
and thus damage to the liner.
Furthermore, install pulse dampers if reciprocating, diaphragm or peristaltic pumps
are used.
• For information on the liner's resistance to partial vacuum →  70
• For information on the shock resistance of the measuring system →  69
• For information on the vibration resistance of the measuring system →  69
Vibrations
L
A0029004
 5 Measures to avoid device vibrations (L > 10 m (33 ft))

Installation Dosimag Modbus RS485
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In the event of very strong vibrations, the pipe and sensor must be supported and fixed.
• For information on the shock resistance of the measuring system →  69
• For information on the vibration resistance of the measuring system →  69
Adapters
Suitable adapters to DIN EN 545 (double-flange reducers) can be used to install the sensor
in larger-diameter pipes. The resultant increase in the rate of flow improves measuring
accuracy with very slow-moving fluids. The nomogram shown here can be used to
calculate the pressure loss caused by reducers and expanders.
The nomogram only applies to liquids with a viscosity similar to that of water.
1. Calculate the ratio of the diameters d/D.
2. From the nomogram read off the pressure loss as a function of flow velocity
(downstream from the reduction) and the d/D ratio.
100
10
0.5
d / D
[mbar]
0.6 0.7 0.8 0.9
1 m/s
2 m/s
3 m/s
4 m/s
5 m/s
6 m/s
7 m/s
8 m/s
1
D
d
max. 8°
A0016359
6.1.3 Special mounting instructions
Information for filling systems
Correct measurement is possible only if the piping is completely filled. We therefore
recommend that some test batches be carried out prior to production batching.