RMG USM GT400 User manual

Operating Manual

Ultrasonic Flowmeter USM GT400

Issued:

07.05.2021

Version:

Firmware:

1.5

Contact

Manual USM GT400 · EN10 · May 2021

Manufacturer

Our customer service is available for technical queries:

Address

RMG Messtechnik GmbH

Otto-Hahn-Straße 5

D-35510 Butzbach

Telephone Switchboard

+49 6033 897 –0

Telephone Service

+49 6033 897 –0

Telephone Spare Parts

+49 6033 897 –173

Fax

+49 6033 897 –130

E-Mail

[email protected]

Original Document

The Ultrasonic Flowmeter USM GT400 OPERATING

INSTRUCTION 07.05.2021 is the original document.

This document may serve as a reference for translations into

other languages. Please use in case of any uncertainties the

German version as main reference.

Note

Unfortunately, paper is not updated automatically, whereas

technical development continuously advances. Therefore, we

reserve the right to make technical changes regarding the rep-

resentations and specifications of these operating instructions.

The latest version of this manual (and other devices) can be

downloaded at your convenience from our Internet homepage:

www.rmg.com

Date created

1/31/2014

…

4th revision date

02/12/2018

5th revision date

09/4/2018

6th revision date

11/18/2018

7th revision date

12/14/2019

8th revision date

02/19/2021

9th revision date

05/07/2021

Document version

and language

Document version

Ultrasonic Flowmeter USM GT400

manual de May 7th 2021

Language

Contents 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
I
Content 
1ABOUT THIS MANUAL......................................................................... 1 
1 Objective of the manual.......................................................................................1 
2 Specialized knowledge required .......................................................................2 
2.1 Specialized knowledge required..........................................................................2 
2.2 Abbreviations.......................................................................................................3 
2.3 Layout of instructions ..........................................................................................4 
2.4 Working with the device ......................................................................................5 
2.5 Risk assessment and minimization...................................................................11 
2.6 Validity of the manual........................................................................................13 
2.7Transport...........................................................................................................14 
2.8 Scope of delivery...............................................................................................16 
2.9 Disposal of packaging material .........................................................................16 
2.10 Storage..............................................................................................................16 
3 Explosion-proof design.....................................................................................17 
3.1 General information...........................................................................................17 
4 Inspection and maintenance work..................................................................18 
4.1 General information...........................................................................................18 
2QUICK GUIDE....................................................................................... 20 
1 Mechanical connection......................................................................................21 
1.1 Connection flanges............................................................................................21 
1.2 Inlet / outlet piping .............................................................................................21 
1.3 Joining pressure connections............................................................................21 
2 Electrical connection .........................................................................................22 
3 Start up..................................................................................................................22 
4 Earthing.................................................................................................................23 
5 Parameter setting................................................................................................24 
3DEVICE OVERVIEW............................................................................ 25 
1 Main components................................................................................................25 
2 Ultrasonic electronics........................................................................................27 
3 Arrangement of the ultrasonic transducers .................................................31 
4FUNCTIONAL PRINCIPLE –ULTRASONIC-FLOW 
MEASUREMENT.................................................................................. 32 

Contents 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
II 
1 General description............................................................................................33 
2 Correction of the base line...............................................................................37 
2.1 Base line correction via polynomial................................................................... 38 
2.2 Correction via a piecewise linearization............................................................ 39 
3 Diagnostic function Speed of Sound............................................................. 40 
3.1 Standard method of SoS calculation................................................................. 40 
3.2 SoS calculation via gas components ................................................................ 40 
3.3 Extended SoS calculation................................................................................. 41 
4 Import of gas composition data...................................................................... 42 
4.1 Option 4: Data input on fixed defaults............................................................... 43 
4.2 Data input on fixed defaults for air .................................................................... 43 
4.3 Data input via RMGBus .................................................................................... 45 
4.4 Data via Modbus (USM GT400 is SLAVE) ....................................................... 46 
4.5 Import of data via Modbus (USM GT400 is Master).......................................... 47 
5 Batch mode..........................................................................................................52 
6 Signal damping ................................................................................................... 52 
5SAFETY.................................................................................................. 53 
1 Intended use ........................................................................................................54 
2 Layout of instructions .......................................................................................55 
3 Qualification of the personnel......................................................................... 56 
4 Safety instructions............................................................................................. 57 
4.1 Hazards during transporting.............................................................................. 58 
4.2 Hazards during installation................................................................................ 58 
4.3 Hazards during start up..................................................................................... 60 
4.4Hazards during cleaning ................................................................................... 61 
4.5 Hazards during maintenance and repairs......................................................... 61 
4.6 Hazards during operation.................................................................................. 62 
4.7 Hazards for operation in potentially explosive environments............................ 63 
5 Responsibilities of the operator......................................................................64 
6TRANSPORT AND STORAGE.......................................................... 65 
1 Transport.............................................................................................................. 66 
1.1 Scope of supply ................................................................................................ 66 
1.2 Transporting the device .................................................................................... 67 
1.3Unpacking the device........................................................................................ 67 
1.4 Disposal of packaging material......................................................................... 70 
1.5 Prior to installation ............................................................................................ 70 
1.6 Removing the transporting locks....................................................................... 71 

Contents 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
III 
2 Packing the device for transportation............................................................73 
3 Storage ..................................................................................................................79 
3.1 Packing the device for storage..........................................................................79 
3.2 Checking the device after storage.....................................................................80 
7CONSTRUCTION AND PLANNING.................................................. 81 
1 Connection flanges.............................................................................................81 
2 Seals.......................................................................................................................82 
2.1 Flat seal.............................................................................................................83 
2.2 Grooved gaskets...............................................................................................84 
2.3 Spiral seals........................................................................................................85 
3 Screws...................................................................................................................87 
4 Installation possibilities ....................................................................................88 
4.1 Dependency on the gas flow direction ..............................................................88 
4.2 Two devices series connected (Face to Face)..................................................91 
5 Flow computer.....................................................................................................93 
8INSTALLATION.................................................................................... 95 
1 Assembly work preparations ...........................................................................96 
2 Installation of the device...................................................................................99 
2.1 Mounting the inlet and outlet piping...................................................................99 
2.2 Installation of the connection box....................................................................101 
3 Connecting the device electrically............................................................... 103 
3.1 Connecting the power supply..........................................................................108 
3.2 Digital interfaces of USM-GT400.....................................................................108 
3.3 Connecting the computer for RMGViewUSM.....................................................110 
3.4 Connecting the flow computer.........................................................................110 
3.5 Connection of external DSfG-Device-F via Modbus........................................113 
3.6 Interface converter ..........................................................................................124 
3.7 Connecting the device to earth........................................................................126 
4 Installing the pressure connection.............................................................. 128
5 Outdoor installation......................................................................................... 130 
9START UP ........................................................................................... 132 
1 Comparing meter parameters....................................................................... 132 
2 Checking functions of the USM.................................................................... 132 
3 Reading out speed of sound......................................................................... 133 

Contents 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
IV 
OPERATION........................................................................................ 134 
1 Measuring values and parameters............................................................135 
1.1 Input protection for parameters....................................................................... 135 
1.2 Parameter and measuring values with variable units ..................................... 135 
1.3 Calibration and Service Switch ....................................................................... 136 
1.4 Interfaces to converters and controllers.......................................................... 136 
1.5 Interface for service and parameterization...................................................... 137 
1.6 Adaptation of the DZU protocol to ERZ 2400 ................................................. 138 
2 Calling up and changing the parameters via the ultrasonic electronics

2.1 Calling up the value of a parameter................................................................ 140 
2.2 Entering data................................................................................................... 141 
2.3 Changing the parameters of protection E and S............................................. 144 
3 Parameterize the USM interface.................................................................149 
3.1 Interface 0....................................................................................................... 149 
3.2 Interface 1....................................................................................................... 150 
3.3 Interface 2....................................................................................................... 150 
4 Modbus communication in detail ..............................................................161 
4.1 Codes supported............................................................................................. 161 
4.2 Data types....................................................................................................... 161 
5 Configuration of the current output..........................................................163 
6 List of the measurement values and parameters.................................163 
MAINTENANCE.................................................................................. 164 
1 Maintenance schedule .................................................................................165 
2 Checking the device for leaks....................................................................165 
3 Checking the device for any signs of damage.......................................166 
4 Changing the battery....................................................................................166 
5 Changing the transducer.............................................................................166 
6 Changing the ultrasonic electronics.........................................................167 
7 Cleaning the device ......................................................................................167 
8 Check the official seal..................................................................................168 
9 Decommissioning and disposal ................................................................168 
ALARM AND WARNING MESSAGES ........................................... 170 
1 Alarm messages............................................................................................171 
2 Warning messages........................................................................................172 

Contents 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
V
3 Notes................................................................................................................ 175 
4 Troubleshooting............................................................................................ 175 
TECHNICAL SPECIFICATIONS...................................................... 177 
1 Performance data.......................................................................................... 178 
2 Approved gas types..................................................................................... 180 
2.1 Suitability and safety for natural gas containing H2 ........................................180 
3 Approved measuring range according to MID....................................... 181 
4 Type plate....................................................................................................... 182 
4.1 Type plate ATEX / IECEx................................................................................183 
4.2 Type plate NEC (CSA) ....................................................................................184 
5 Weights and dimensions ............................................................................ 184 
5.1 NEC (CSA)......................................................................................................185 
5.2 ATEX / IECEx..................................................................................................186 
6 Inner diameter of connecting spool pieces............................................ 189 
7 Official seal diagram .................................................................................... 192 
7.1 Type plate........................................................................................................192 
7.2 Ultrasonic electronics......................................................................................193 
7.3 Ultrasonic gas meter .......................................................................................195 
8 Transducer types.......................................................................................... 197 
SPARE PARTS AND ACCESSORIES ........................................... 199 
LISTS OF PARAMETERS AND MEASURED VALUES.............. 201 
USM GT400 APPROVAL.................................................................. 246 
1 Metrological approvals................................................................................ 246 
2 Pressure devices approval......................................................................... 246 
3 Electromagnetic compatibility................................................................... 246 
4 Explosion protection approval.................................................................. 246 
5 Standards, directives and guidelines ...................................................... 247 
USM GT400 GLOSSARY.................................................................. 249 
USM GT400 ATTACHMENT............................................................. 250 
 
 

Contents

Manual USM GT400 · EN10 · May 2021

1 About this manual 
 
 
 
 
Manual USM GT400 · EN10 · May 2021 
1
1 About this manual 
Content 
 
1.1 Objective of the manual 1 
1.2 Specialized knowledge required 2 
1.2.1 Specialized knowledge required 2 
1.2.2 Abbreviations 3 
1.2.3 Layout of instructions 4 
1.2.4 Working with the device 5 
1.2.5 Risk assessment and minimization 11 
1.2.6 Validity of the manual 13 
1.2.7 Transport 14 
1.2.8 Scope of delivery 16 
1.2.9 Disposal of packaging material 16 
1.2.10 Storage 16 
1.3 Explosion-proof design 17 
1.3.1 General information 17 
1.4 Inspection and maintenance work 18 
1.4.1 General information 18 
 
 
 
1.1 Objective of the manual 
In this chapter you will be given information on this manual. 
The manual provides you with the information that is designed for trouble-free and 
safe operation. 
The ultrasonic gas meter is state of the art and conceived and manufactured ac-
cording to the recognized safety standards and guidelines. 
However, risks may arise during use that can be easily avoided by observing this 
manual. 
For this reason, you may only use the device as intended and in technically sound 
condition. 
If the ultrasonic gas meter is not used for its intended purpose, warranty claims will 
be void. 
 

1 About this manual

Manual USM GT400 · EN10 · May 2021

1.2 Specialized knowledge required

This manual provides information that is necessary for fault-free and safe opera-

tion.

The Ultrasonic Flowmeter USM GT400 was designed and produced according to

the state of the art and generally recognized safety standards and directives. How-

ever, its use can entail dangers that are avoidable by complying with this manual.

The device must only be used as intended and in technically sound condition.

Vorsicht

Unintended use voids all warranty claims and the Ultrasonic Flowmeter

USM GT400 can also lose its approvals.

1.2.1 Specialized knowledge required

Persons working with or on the device must have the following knowledge:

•training / education for working in potentially explosive environments.

•the ability to correctly assess dangers and risks when using the device. Possi-

ble dangers are, e.g., components under pressure or the result of incorrect in-

stallation.

•recognize dangers that could be caused by the used flow medium.

•training / education by RMG for working with gas measuring instruments.

•education / instruction in all country-specific standards and directives to be ob-

served for work that is to be carried out on the device.

Further information can be found under:

Chapter 5.3, „Qualification of the personnel“ on page 56

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