RMG USM GT400 Operating Instruction

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Ultrasonic Flowmeter USM GT400

OPERATING INSTRUCTION

Reliable Measurement of Gas

Read the instructions before starting work!

Manufacturer Our customer service is available for technical queries:

Address RMG Messtechnik GmbH

Otto-Hahn-Str. 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 service@rmg.com

Original Document

Note

The Ultrasonic Flowmeter USM GT400  OPERATING INSTRUCTION 9/4/2018 is the origi

This document may serve as a reference for transla

nal document.

tions into other languages. Please use in case of any uncertainties the German version as main reference.

Unfortunately, paper is not updated auto

matically, whereas 

technical development continuously advances. Therefore, we  reserve the right to make technical changes in r representations and specificatio

ns of these operating 

egard to the 

instructions. The latest version of this manual (and other devices)

downloaded at your convenience from our Internet home-

can be page:

www.rmg.com

Date created 1/31/2014

1st revision date

2nd revision date

5/12/2014

9/18/2015

9/29/2017

2/16/2018

09/04/2018

September, 4

2018

Document version and language

3rd revision date

4th revision date

5th revision date

Document version Ultrasonic Flowmeter USM GT400 

Language EN

I Ultrasonic Flowmeter USM GT400 September, 4

2018

Contents

1 About this manual

1.1 Objective of the manual ........................... 1

1.2 Specialized knowledge required .............. 2

1.3 Abbreviations ........................................... 2

1.4 Symbols ................................................... 3

1.5 Validity of the manual .............................. 3

2 Brief instructions

2.1 Mechanical connection ............................ 5

2.2 Electrical connection................................ 6

2.3 Start Up.................................................... 7

2.4 Earthing ................................................... 7

2.5 Parameter setting .................................... 8

3 Device overview

3.1 Main components .................................... 9

3.2 Ultrasonic electronics............................. 11

3.3 Arrangement of the 

ultrasonic transducers............................ 15

4 Functional principle - Ultrasonic flow measurement

8 Installation

8.1 Assembly work preparations ................. 78

8.2 Installation of the device........................ 80

8.3 Connecting the device electrically ......... 84

8.4 Installing the pressure connec

8.5 Outdoor installation.............................. 114

tion....... 112

9Start Up

9.1 Comparing meter parameters.............. 115

9.2 Checking functions of the USM ........... 115

9.3 Reading out speed of sound................ 116

10 Operation

10.1 Measuring values and parameters ...... 118

10.2 Calling up and changing the parameters 

via the ultrasonic electronic

10.3 Parameterize the USM i

10.4 Modbus communication in detail ......... 141

10.5 List of the measure

parameters .......................................... 143

ment values and 

s ............... 121

nterface ......... 131

11 Maintenance

4.1 General description................................ 17

4.2 Correction of the base line..................... 21

4.3 Diagnostic function Speed of Sound...... 24

4.4 Import of gas compositi

4.5 Batch mode............................................ 36

on data.............. 27

5 Safety

5.1 Intended use .......................................... 37

5.2 Layout of instructions............................. 38

5.3 Qualification of the personnel ................ 39

5.4 Safety instructions ................................. 39

5.5 Responsibilities of the operator ...

.......... 46

6 Transport and storage

6.1 Transport ............................................... 47

6.2 Packing the device for transportation

6.3 Storage .................................................. 62

.... 55

7 Construction and Planning

7.1 Connection flanges ................................ 65

7.2 Seals...................................................... 66

7.3 Screws ................................................... 70

7.4 Installation possibilities .......................... 71

7.5 Flow computer ....................................... 75

11.1 Maintenance schedule......................... 146

11.2 Checking the device for leaks

11.3 Checking the device for any signs of 

damage................................................ 147

11.4 Changing the battery .

11.5 Changing the transducer

11.6 Changing the ultrasonic elect

11.7 Cleaning the device ............................. 148

11.8 Check the official seal.......................... 149

11.9 Decommissioning and disposal ........... 149

.......................... 147

.............. 146

..................... 147

ronics..... 148

12 Alarm and warning messages

12.1 Alarm messages.................................. 151

12.2 Warning messages...........

12.3 Notes ................................................... 157

12.4 Troubleshooting................................... 157

................... 154

13 Technical specifications

13.1 Performance data................................ 160

13.2 Approved gas types ............................ 160

13.3 Approved measuring range according 

to MID.................................................. 161

13.4 Type plate............................................ 162

13.5 Weights and dimensions ..................... 163

September, 4th 2018 Ultrasonic Flowmeter USM GT400 II

Contents

13.6 Inner diameter of connecting 

spool pieces......................................... 168

13.7 Official seal diagram ............................ 169

13.8 Transducer types

14 USM GT400 Approval

14.1 Metrological approvals......................... 177

14.2 Pressure devices approval .

14.3 Electromagnetic compatibility ..............177

14.4 Explosion protection approval.............. 177

14.5 Standards, directives and guidelines... 178

15 Index

16 USM GT400 Glossary

17 USM GT400 Attachment

................................. 175

................. 177

18 Lists of parameters and measured values

III Ultrasonic Flowmeter USM GT400 September, 4th 2018

1 About this manual

1.1

About this manual

In this chapter you will be given information on this manual.

Contents 1.

1.1 Objective of the manual ...................................... 1

1.2 Specialized knowledge required

1.3 Abbreviations

1.4 Symbols

1.5 Validity of the manual

Objective of the manual

....................................................... 2

................................................................ 3

........................ 2

.......................................... 3

The manual provides you with the information that is designed for trouble-free and safe operation.

The ultrasonic gas meter is state of the manufactured according to the recognized safety standards and guidelines.

However, risks may arise during us by observing this manual..

For this reason, you may only use the device as intended and in

cally sound condition.

techni

If the ultrasonic gas meter is not used for it warranty claims will be void.

art and conceived and

e that can be easily avoided

s intended purpose,

September, 4th 2018 Ultrasonic Flowmeter USM GT400 1

1 About this manual

1.2

Specialized knowledge required

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

• training / environments.

• the ability the device. Possible dangers are, e.g., components under pressure or the result of incorrect installation.

• r

ecognize dangers that could be cau

medium.

• training / instruments.

• education / instruc directives to be observed 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 39

education for wo

to correctly ass

education b

tion in all c

rking in potentially explosive

ess dangers and risks when using

sed by the used flow

y RMG for working with gas measuring

ountry-specific standards and

1.3

Abbreviations

The following abbreviations are used:

AGC Automatic Gain Control

ca. circa, approximately

as app. as applicable

max. maximum

MC Measurement Canada

MID Measurement Instruments Directive

min. minimum

SNR Signal to Noise Ratio

SoS Speed of Sound

TD Transducer (ultrasonic transmitter and

receiver)

TNG Transducer of a certain production type.

USE Ultrasonic electronics

USM Ultrasonic gas meter

e.g. For example

2 Ultrasonic Flowmeter USM GT400 September, 4th 2018

1 About this manual

1.4

Symbols

The following symbols are used:

1, 2, ... Marks steps within a work operation.

Marks steps in an illustration that are described in the text.

(A) Reference to a component (element) marked

with a letter in an illustration.

Marks elements in an illustration. The arrow points to the element being described.



Print Screen Marks switches, regulators, slides, buttons

Marks a cross-reference that refers to another part in this manual or in another document.

and other terms from the software are marked by bold text.

1.5

Validity of the manual

This manual describes the Ultrasonic Flowmeter USM GT400.

The Ultrasonic Flowmeter USM GT400 d complete on site system. Observe also the instructions of other components of the site system.

If you find contradicting instructions

evice is only a part of a

, please contact RMG.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 3

1 About this manual

4 Ultrasonic Flowmeter USM GT400 September, 4th 2018

2 Brief instructions

2.1

Brief instructions

This chapter does not replace the rest of the operating instructions. It shows only a brief section of t to make the device ready for operation.

The chapter is only directed at experienced users.

• Observe the chapter safety.

 Section 5, "Safety" on

Detailed information for this content can be found under:

 Section 7, "Construction and Planning" on page 65  Section 8, "Installation" on page 77  Section 9, "Start Up" on page 115  Section 12.4, "Troubleshooting" on page 157

Mechanical connection

page 37

he steps necessary in order

2.1.1

2.1.2

Operating mode Inlet piping Outlet piping Temperature sensor

Unidirectional operation 10 D (no flow conditioner) 3 D 1.5 D to 5 D

Unidirectional operation 3 / 5 D (with RMG or stan-

Bidirectional operation 10 D (no flow conditioner) 10 D (no flow conditioner) 3 D to 5

Bidirectional operation 3 / 5 D (with RMG or stan-

1 Depending on the nominal width.

Connection flanges

1 Make sure that the device and the connection flange have

the same pressure rating / flange standards.

2 Make sure that the device is sealed with the appropriate

seals.

Inlet / outlet piping

dardized flow conditioner)

position

3 D 1.5 D to 5 D

3 / 5 D (with RMG or standardized flow conditioner)

2 D to 5 D

–See also "Inner diameter of connecting spool pieces" on

page 168

September, 4th 2018 Ultrasonic Flowmeter USM GT400 5

2 Brief instructions

2.1.3

2.2

Joining pressure connections

 Establish connection with the clamping screw connec-

tion

3 Unscrew the union nut of the clamping screw connection.

4 Remove the blind plug.

5 Push the union nut and clampin

6 Push the pipe into the clamping screw con

stop.

7 Tighten the union nut in order to fix and seal t

 Establish connection with the female thread

8 Unscrew

9 Seal the connection in the thread.

the blind plug.

Electrical connection

g ring

s onto the pipe.

nection until the

he pipe.

Fig. 2-1: Connection assignment on the terminal strip

10 Connect the computer to the terminals RS 485-0.

11 Allocate the terminal strips according to the applications.

Option: connect ERZ 2000 (-NG) to RS 485-1.

6 Ultrasonic Flowmeter USM GT400 September, 4th 2018

2 Brief instructions

2.3

2.4

Start Up

Earthing

12 Supply the device with power supply (24 V DC) via the

system.

If the power LED illuminates green permanently, ready for operation.

If the alarm and warning LED do no ates trouble-free.

 Section 3.1, "Light emitting diodes" on page 14

The USM-GT-400 is supplied without connection box to the North American through a flame arrester. The marking of the cable (numbers) is (always) identical to the terminal assignment.

region, the connection is made to cables that are led

t flash, the device oper-

the device is

A Earthing screw M6 B Earthing screw M6 C Earthing cable

Fig. 2-2: Connect to earth - Ultrasonic gas meters DN150 (6")

and DN100 (4")

September, 4th 2018 Ultrasonic Flowmeter USM GT400 7

2 Brief instructions

A Earthing screw M6 B Earthing screw M6 C Earthing cable

2.5

Fig. 2-3: Connect to earth - Ultrasonic gas meter  DN200 (8")

13 Connect the earthing cable according to the ultrasonic gas

meter version DN100 (4") to DN150 (6") or from DN200 (8").

Parameter setting

The device shall be supplied pre-assembled according to customer agreement. Changes to the pre-assembly are more exten

sive and are therefore not described in this brief instruction.

If this should be necessary, you will then find the description:

 Section 10.1.3, "Calibration and Service Switch" on page 119

8 Ultrasonic Flowmeter USM GT400 September, 4th 2018

3 Device overview

3.1

Device overview

In this chapter you will receive information on the main components of the ultrasonic gas meter and the arrangement of the ultrason

Contents 3.

3.1 Main components ................................................ 9

3.2 Ultrasonic electronics

3.3 Arrangement of the ultrasonic transducers

Main components

ic transducers in the housing of the ultrasonic gas meter.

....................................... 11

.... 15

A Covers of the transducer and

transducer lines

C Ultrasonic electronics D Lifting eyes E Joining flanges F Transducer G Retaining bolts

Fig. 3-1: Main components of the ultrasonic gas meter

The ultrasonic gas meter consists of the following main components:

September, 4th 2018 Ultrasonic Flowmeter USM GT400 9

B Covers of the transducer lines

3 Device overview

Covers of the transducers (A and B) The covers protect the connections and the lines of the transduc-

er (TD) against contamination and mech

anical damage.

Ultrasonic electronics (C) The ultrasonic electronics is in a pressur

housing mounted on the ultrasonic gas meter. The ultrasonic electronics evaluates the data recorded by the transducers. In addition to the display, the parameters can be shown and evaluated on a computer using the RMGView

Lifting eyes (D) The lifting eyes can be used to safely transport the device using

suitable lifting gear.

Connection flange (E) The device is bolted onto the g

flanges.

Transducer (F) The transducers are installed in the housing of the ultrasonic ga

eter and are not visible once installed.

Retaining bolts (G) The retaining bolts are mounted when delivering the device. The

retaining bolts away. The bolts must be mounted to ensure for a safe installation or de-installation.

secure the product from tipping over or rolling

s line using the connection

e tight, encapsulated

USM

software.

10 Ultrasonic Flowmeter USM GT400 September, 4th 2018

3 Device overview

3.2

Ultrasonic electronics

A Service and calibration switch B Control panel C Display D Magnet for operation E Cover with viewing window F Pressure tight housing

Fig. 3-2: Ultrasonic electronics and displ ay

Device data (readings and parameters) can be set and evaluated via the display and the operating elements.

Moreover, the device data (readings shown, evaluated and set using the RMGView

Service and calibration switch (A) The service switch (right switch) is o

vice switch is, e.g., used to ins

The calibration switch (left switch) protects the pa against unauthorized changes. The device can be configured by opening the calibration switch.

Control panel (B) The control field comprises buttons that are triggered by pressing

a butto and status messages are called up using the button.

Display (C) The display shows the readings, warning , alarm and status mes-

sages as well as the parameters.

Magnet for operation (D) The magnet is used to operate the control panel of the ultrasonic

el above the symbol on the viewing window, this function is activated.

n or magnetically. Parameters, readings, warning, alarm

ics when the housing is closed. If the magnet is placed

ectron

tall new firmware.

and parameters) can also be

nly for RMG service. The ser-

USM

software.

rameters

September, 4th 2018 Ultrasonic Flowmeter USM GT400 11

3 Device overview

Cover with viewing window and

pressure tight housing (E and F)

Electrical connection

erminal strip)

First line Shows the name of the parameter (coordinates) called-up, e.g.,

The cover and the pressure tight housing encapsulate the ultrasonic electronics against the potentially e

During operation, information can be read through the viewing window from the display and status indicat

re information on the electrical connection can be found here:

 Chapter 8.3, „Connecting the device electrically“ on page 84

xplosive atmosphere.

ors of the LEDs.

Display screen

Fig. 3-3: Example for a possible disp l ay

p-maximum value (maximum pressure value).

Second line Shows the value of the parameter (

52.00 bar a.

Third line Shows the coordinate designation, e.g., A-06, thus column A, line

06.

The calibration switch is open. The value of the parameter can be changed.

The calibration switch is closed. The value of the parameter cannot be changed.

Forth line Shows the warning, alarm and status messag

failure

coordin

ates) called-up, e.g.,

es, e.g., -01 power

12 Ultrasonic Flowmeter USM GT400 September, 4th 2018

3 Device overview

Buttons

When the cover is closed, the buttons can be operated through the glass using the magnets supplied. The cover must not be opened.

Change to the columns. Jump, e.g., from A to B and back again.

When holding for a longer time, you can change the columns by quickly scrolling back.

Change or scroll forwards in the lines step by step, e.g., from A01 to A-02.

When holding for a longer time, you can change the lines quickly scrolling forward.

Change or scroll back in the lines step by step, e.g., from A-01 to A-02.

When holding for a longer time, you can ch quick return.

Enter values.

ange the lines with

Reset button

The reset button (A) is for RMG service only. If the reset button is pressed, the ultrasonic electronics is restarted.

Switches

Calibration switch (A): Activate to change parameters.

Service switch (B): For RMG service only. For in

firmware.

stalling a new

September, 4th 2018 Ultrasonic Flowmeter USM GT400 13

3 Device overview

Light emitting diodes

A Flow B Power (supply voltage) C Alarm D Warning E Reset F Service (service switch state) G Calibration (calibration switch

state)

Fig. 3-4: LEDs of the electronic ultrasonic electronics

LED Illuminates con-

H Button states

flashing

tinuously

Power Voltage supply is

switched on.

Flow Gas flow present. —

Alarm Alarm message is

stored.

Warning Warning message is

stored.

Reset Reset is running.

Calibration Calibration switch is

open.

—

Alarm is active.

Warning is active.

—

Service Service switch is

open.

Control panel Panel is being

pressed.

—

14 Ultrasonic Flowmeter USM GT400 September, 4th 2018

3 Device overview

3.3

Arrangement of the ultrasonic transducers

Fig. 3-5: Transducer paths and levels of the ultrasonic gas meter

The figure shows the arrangement of the transducers that are located in the ultrasonic gas meter. The arrangement of the transd

ucers in the three levels is shown in three section

representations.

Four transducers are installed per level. The transducers form two paths per level for

September, 4th 2018 Ultrasonic Flowmeter USM GT400 15

the measurement.

3 Device overview

16 Ultrasonic Flowmeter USM GT400 September, 4th 2018

4 Functional principle - Ultrasonic flow measurement

Functional principle - Ultrasonic flow measurement

Content 4.

4.1 General description ........................................... 17

4.2 Correction of the base line

4.2.1 Base line correction via polynomial ........................ 22

4.2.2 Correction via a piecewise lin

4.3 Diagnostic function Speed of Sound ............... 24

4.3.1 Standard method of SoS calculation ...................... 24

4.3.2 SoS calculation via gas compone

4.3.3 Extended SoS calculation

4.4 Import of gas composition data ....................... 27

4.4.1 Option 4: Data input on fixed defaults .................... 27

4.4.2 Option 4: Data input on fixed defa

4.4.3 Data input via RMGBus

4.4.4 Data via Modbus (USM-GT-400 is SL

4.4.5 Import of data via Modbus (U

............................... 21

earization ................. 24

nts ...................... 24

...................................... 25

ults for air .......... 28

.......................................... 30

AVE) ........... 30

SM-GT-400 is Master) ..

4.1

4.5 Batch mode ........................................................ 36

General description

In this chapter, you are provided with information as to how the ultrasonic gas meter records the data. The necessary formulas are listed for this purpose.

Figure 4.1 shows the general working principle. Transducer TD1 and TD2 ar ment and form a measurement path wit ultrasonic pulse travels along the measuring path from sensor TD1 to transducer TD2 more quickly than the other way around. This is caused physically by vector addition of the flow velocity to the speed of sound, the arrow above the of flow.

e positioned opposite to each other for the measure-

h distance L. An

shows the direction

September, 4th 2018 Ultrasonic Flowmeter USM GT400 17

4 Functional principle - Ultrasonic flow measurement

: t=

TD12

: t=

TD21

TD12

c0v cos+

---------------------------------

TD21

c0v cos–

-------------------------------- -

2 cos

---------------------

TD12

-------------

TD21

-------------

–





=

2 d

-----------

TD21tTD12

–

TD12tTD21



--------------------------------- -



2 d

-----------

t

TD12tTD21



------------------------------- -

==

Formulas

Fig. 4-1: Two sensors form one path for the measurement

The transit time from TD1 to TD2 ( TD1 ( formula:

Fig. 4-2: Formula, transit time

These transit times of the ultrasonic pulses are determined by the electronic ultrasonic system. These are used to determine the average velocity

) are calculated according to the following

along the measuring path:

) and from TD2 to

Fig. 4-3: Formula, average path velocity

Legend

18 Ultrasonic Flowmeter USM GT400 September, 4th 2018

v: Average flow velocity

c0: Speed of sound

: Path angle to the pipe

L: Path length

4 Functional principle - Ultrasonic flow measurement

=

wivki

i 1=



d: Diameter D

(For a center path. Outer paths have a corresponding value.)

For this calculation, it is important that only the transit times and the device parameters such as the transducer distance and the angle of the measuring path to the flow direction are required. All parameters that include a gas dependency are omitted.

Legend

In order to consider the ave

rage flow profile, in particular an asymmetrical or swirl-affected flow, a total of 6 paths is measured in 3 levels with the USM-GT-400 ultrasonic gas meter. The 3 levels can be derived ma

tically via an integration procedure,

thema

the so-called Gauss integration.

 "Arrangement of the ultrasonic transducers" on page 15

The respective average path velocities (designated with for the respective measuring path i) along these measuring paths results analogically to the fo

Under certain conditions such as, e.g., sm

rmula above.

aller deviations from the tolerances during the production, it may be necessary to correct the path velocities with a common factor:

Fig. 4-4: Formula, corrected path v elocity

k = Correction factor for the path velocities

= Corrected path velocity (m/s)

(This factor is named vw factor d1for the forward direction and vw factor d2 for back-flow; see chapter parameter setting 10.5.4)

Thus, one obtains for the average flow velocity:

Fig. 4-5: Formula, flow velocity

Legend

= Average flow velocity (m/s)

= Weighting factor with regard to the flow profile

The summation and the weighting specified result from the mathematic Gaussian integration procedure.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 19

4 Functional principle - Ultrasonic flow measurement





20;6..1











Nivv

iiji





ijv,

Quality of installation

The USM-GT-400 provides parameters that allow a rating of the installation. If the values are within given ranges, then good measurement conditions can be assumed. If the the accuracy of the reading may be affected by disturbed flow conditions. Please contact in this case the RMG service.

"Manufacturer" on page I

Turbulence

Due to the actual flow, in particular the turbulence, there will be characteristic variations (variance locities (i = 1..6; number of ultra allow an assessment of the installation. The ultrasonic path averaged turbulence (

) is calculated as follows:

values are outside

) of the individual path ve-

sonic measuring paths), which

Legend

Fig. 4-6: Variance

Fig. 4-7: Turbulence

Time averaged flow velocity along the ultrasonic path

Flow velocity along the ultrasonic path

20; number of values for turbulence calculation  (named Turb./Perf. count; see chapter parameter)

Typical values at very good flow conditions for at 2-3%, for the outer paths, the turbulence increases to 4%. If these values are above 10%, then disturbed conditions can be assumed affecting the measurement accuracy. At lowest velocities the turbulence calculation is

swit

ched off.

middle paths are

Profile and symmetry factor

For a fully developed flow the middle path (3 + 4) have the highest velocity, the two outer paths (1 + 2; 5 + 6) are more or less equal. The profile factor (

20 Ultrasonic Flowmeter USM GT400 September, 4th 2018

) is typically between 1.05 to 1.20; at val-

4 Functional principle - Ultrasonic flow measurement





6521

vvvv







 





600

)(0)(1

100..16..1

okvokv









ues below 1.00 or above 1.50, the flow conditions should be checked.

Fig. 4-8: Profile factor

The symmetry factor (SY) usually is between 0.9-1.10; at values below 0.75 or above 1.25 the flow conditions should be checked.

Fig. 4-9: Symmetry factor

Meter performance

This value ( paths could be measured and involved in the flow c is calculated on base of the last 20 measurements (same as turbulence).

Fig. 4-10: Meter performance

The highest value is 100%; under normal conditions it is above 95%. Since 2 measurement paths can fail before the  USM-GT-400 loses its calibrated accuracy, down to 66%; if the path failure is caused by a defect transducer an immediate repair of the failed transducers should to be initiated.

All of these values are given at the display of th they are identical to the values in the RMGView

) indicates whether the velocity of all ultrasonic

alculation. It

the value may fall

e USM-GT-400;

USM

4.2

September, 4th 2018 Ultrasonic Flowmeter USM GT400 21

Correction of the base line

Correction of the baseline for the velocity

There are several influences (eg. Reynolds number) resulting in a not exactly proportional relation between the measured and according to the formula 4.5 calculated mean v

elocity to the exact

4 Functional principle - Ultrasonic flow measurement

vwK

100

---------





=

vw

--------

3600

s h

-- -

  =

kkv



--------

3600

-- -

  =

const G

–

-------------------------------

const G

–

-------------------------------

const G0– const G1–v

const G2–v

++++=

mean velocity. Here the following correction helps to compensate these variations:

Bild 4-11: Formula, corrected average flow velocity

Legend

F = Error from the characteristic curve correction

These values can be used to calculate the process volume flow rate respectively the corrected process volume flow:

Fig. 4-12: Formula, process volume flow

Fig. 4-13: Formula, corrected process volume flow

= Corrected average flow velocity (m/s)

= Meter factor

= Corrected process volume flow

A 4 the device:

4.2.1

Fig. 4-14: Formula - Basic correction of the device

22 Ultrasonic Flowmeter USM GT400 September, 4th 2018

Base line correction via polynomial

Legend

= Corrected weighted flow velocity

= Inside pipe diameter

= Characteristic curve correction

degree polynomial permits the so-called basic correction of

= Deviation of the error curve (%)

4 Functional principle - Ultrasonic flow measurement

vwK

100

---------





= v

wkvwKv

100

---------





=

const m2–

----------------------------

const m1–

----------------------------

const 0– const 1–Q

const 2–Q

++++=

1 F

100

----------------





const-Gx

The constants const-Gx (x = m2, m1, 0, 1, 2) are calculated from the measured value pairs of the deviation with the respective flow velocity.

The calculated correction F flow velocity for F in the formula above.

Fig. 4-15: Formula, corrected meter factor

The process volume flow and the corrected process volume flow result, as listed above, from the multiplication of the corresponding velocities with the pipe cross-section. The correction formulas above are ther flows.

= Average flow velocity (m/s)

= Constants of the basic correction

(x = m2, m1, 0, 1, 2)

is used for the corrected average

efore accordingly easy to transfer to the volume

Polynomial The characteristic curve correctio

Fig. 4-16: Formula, error equation

lso carried out via a 4th

n is a

degree polynomial that represents the error curve of the device.

const-n

The constants Konst-n (n = m2 bis n = 2) are calculated from the measured value pairs error F curve correction K process volume flow.

= Deviation from the error curve (%)

= Flow (m3/h)

= Constants

and flow Qbi. The characteristic

is used for further calculation of the corrected

Fig. 4-17: Formula, characteristic curve correction

September, 4th 2018 Ultrasonic Flowmeter USM GT400 23

4 Functional principle - Ultrasonic flow measurement

12TD

SoS

2112

TDTD

ttL

cSoS









4.2.2

4.3

Correction via a piecewise linearization

The correction of the base line with a polynomial described in section 4.2.1 takes into account the typical, characteristic curve of the USM-GT-400 in an ideal way. This correction is recommended for custody transf MID is valid. Nevertheless, a comparable accuracy can be achieved with a piecewise linearization, if a sufficient number of interpolation points are used. Between the interpolation points, a simple linear interpolation is used. The correction of the base line with the piecewise linearization may also be used in all countries where the MID is valid if the error curve of the raw data mets the requirements of the ISO 17089. In order to achiev points should be placed in the relevant flow rate range. To take into account the higher gradient of the curve at lower flow rates the intervals should not be equidistant; recommended are more points in this lower flow rate range.

a sufficient accuracy most of the measuring

etering in all countries where the

er m

Diagnostic function Speed of Sound

4.3.1

4.3.2

The USM-GT-400 can calculate the SoS in 3 different ways.

Standard method of SoS calculation

The first calculation is realized with help of the transit time

and

suring path with the length speed of sound

Fig. 4-18: Calculation of SoS

This first option is pretty fast and is almost permanently "online" available.

of the ultrasonic pulses (see above) along the mea-

. It is straight forward to result in the

to:

SoS calculation via gas components

The second version of SoS calculation uses pressure, temperature and composition of the gas to determine the SoS according to the

specifications of the AGA 10 standard (AGA Report No. 10,

24 Ultrasonic Flowmeter USM GT400 September, 4th 2018

4 Functional principle - Ultrasonic flow measurement

Speed of Sound in Natural Gas and Other Related Hydrocarbon Gases; January, 2003; AGA - American Gas Association). The calculation is based on statistical considerations of thermodynamics; since it is very complex Knowing the gas composition precisely values such as density, sound velocity and other gas properties can be calculated with very high accuracy.

Depending on the type of gas analyzer it may take 5-10 minutes to determine the volume fractions nents accurately. Accordingly, the precise allocation of flow to gas composition can be done in this time frame only.

, it will not be pres

of the individual gas compo-

ented here.

the

Diagnostic function SoS

The USM-GT-400 determines with highest accuracy the flow rate of the gas flowing through it. For the payoff the gas quality, respectively the calorific value of the gas resulting from the gas composition lows a second billing of the volume flow rate with the "right" ga composition, ie the "right" calorific value.

is of course of big interest, too. The USM-GT-400 al-

4.3.3

This temporal resolution can be achieved receiving permanently

gas composition data from a gas analyzer. A comparison of

the the two differently calculated SoS‘s in the USM-GT-400 allows the immediate detection of any deviation; in particular, another gas composition results in a different SoS. A confirmation of another gas composition then provide the data of the gas analysis instrument.

The temporal correlation of the actual gas composition (using the

calculated via the gas composition) to the SoS using method

SoS 1 results in the higher temporal resolution for the gas composition, respectively the

Extended SoS calculation

The third possibility SoS calculation is presented under the name "Extended SoS measurement". This new method is introduced as an additional determination.

orific value.

cal

s the n

ext comparison with

September, 4th 2018 Ultrasonic Flowmeter USM GT400 25

4 Functional principle - Ultrasonic flow measurement

12TD

122112TD

12TD

SoS



1212211212

12122112

2112

TDTDTD

TDTD

ttt

ttL

cSoS















Fig. 4-19: Extended SoS calculation

Transducer TD2 receives at first the ultrasonic pulse (light blue) coming from TD1 at the time ( ed and moves back to TD1 (dark blue). There this puls reflected, too and reaches TD2 (red) again after the time ( a new possibility to calculate

Fig. 4-20: Calculation of extended SoS

Due to a 10-times smaller variance of the SoS calculation this method offers significantly more accurate result compared to the standard method (version 1). There are 2 reasons for this result; first, the transmitter / receiver error is eliminated (especially T the transit time of the pulse in electronic and transducer is different in the individual transducers) and secondly, any turbulence in medium has lowest influence to the transit time (the time interval between 12TDt and 21TDt is as short as possible). Having typical measuring conditions, this method can easily be applied, but there are conditions at which this method may fail.

). The differences of

). This pulse is partially reflect-

e is

and

results in

flow

;

The SoS calculation according to method 1 and 3 run simultaneously and controlled using the same criteria. If correct, the result o

the extended measurement is preferred due to its higher accu-

26 Ultrasonic Flowmeter USM GT400 September, 4th 2018

racy. Otherwise, the standard method 1 is used; after any change

4 Functional principle - Ultrasonic flow measurement

the measurement conditions, both methods are revalued again. If correct the extended SoS calculation will be chosen again.

TW setting

Measurement tolerances and/or errors of the standard method are permanently controlled using the comparison with the expanded method. Having both values determined. When the calibration switch is open, the T the standard measurement can be corrected to the value of the extended measurement. This is an important adjustment help in case of a transducer replaced, but also serves as an accurate path lengths determination between the transducers during the dry calibration.

a correction for TW can be

-value of

4.4

Import of gas composition data

To use the diagnostic function SoS, respectively to calculate it from the gas composition the USM-GT-400 requires the volume fractions of the individual gas components in the gas (up to 21 components), the pressure and the temperature. From these data SoS is calculated using the guidelines of the AGA 10 standard. For the data transfer of the are available:

gas com

ponents four options

Fig. 4-21: Import of gas composition data

4.4.1

September, 4th 2018 Ultrasonic Flowmeter USM GT400 27

Option 4: Data input on fixed defaults

If there are no live data available for the gas analysis, then the gas data can be stored as fixed values in the USM-GT-400. For

4 Functional principle - Ultrasonic flow measurement

the AGA-10 calculation these default values are used as fixed gas shares (AX-20 - AX-44; in chapter 10 the matrix notation of parameters, measured values and variables will be explained). To change these values they have to be confirmed by selecting "Accept new Comp." in parameters AX-11and to be confirmed in "takeover gas components". Only then they will be taken over as new values for the AGA-10 calculation.

1. Parameter AX-01 „AGA-10 Sourse“

Default data

2. Setting of the default values of the individual gas components

4.4.2

Parameter AX-20 to AX-

Methane default value ....

....

Propene default value

3. Takeover with parameter AX-1

„Taking over new components“

„AGA-10 Source“

Option 4: Data input on fixed defaults for air

In mode "default air" fixed values of air composition for the gas analysis can be used. With the additional parameter "rel. humidity" in AX-06 the water co mol-% and the remaining components of the air are normalized to 100%. The unnormalized default values for air are:

Nitrogen: 78.105 mol-%

Oxygen: 20.946 mol-%

Argon: 0.916 mol-%

Carbon dioxide:

ntent and component is calculated in

033 mol-%

Water: 0.0 .. mol-% (calculated)

The water content is calculated via the relative humidity

1. Parameter AX-01 "AGA-10 source":

"Default air"

2. Setting of the default values

Paramater AX-06 "relative

All other possibilities to transmit the volume fractions of the vidual gas components on the USM-GT-400, of the USM-GT-400.

relative humidity

humidity“

will use interface 2

indi-

Terminal connections

The following figure shows the terminal connections.

28 Ultrasonic Flowmeter USM GT400 September, 4th 2018

4 Functional principle - Ultrasonic flow measurement

Fig. 4-22: Terminal connections

The SoS calculation depends in addition to the gas components also on the gas pressure and temperature. How to measure the pressure is described in chapter 8.4; temperature measurement is given in chapter 7.4. Setting of the parameters AX-02 "SoS Source Temp." and AX-03 "SoS Source Pressure" allows to select whether these measured values of temperature and pressure ar

e u

sed for AGA-10 calculation or default values AX-04 and AX-

05.

Fig. 4-23: Pressure and Temperature input

The electric connection of pressure (p) and temperature (T) has to be done a terminals 26 to 31; AUX1 = p; AUX2 = T.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 29

4 Functional principle - Ultrasonic flow measurement

4.4.3

Data input via RMGBus

The data of a gas chromatograph (eg. RMG GC9000 or GC9300) can be delivered as RMGBus telegram via the RMGBus protocol. Therefore, the coordinate AX-01 “SoS AGA-10 source data“ is set to "Serial port 2" and the serial interface in the mode "RMGBus". Additionally the parameters of the interfaces USM-GT-400 a

the RMGBus master device have to be aligned to each other.

Because the content of the telegram may have data from different streams, the AX-09 "Stream selection". Parameter AX- fixes how many components are part of the telegram. When using a GC9000 this parameter has to be set to "RMGBus" to offer a correct

1. Parameter J-

2. Setting the parameters of serial 2:

„right“ stream has to be set with the parameter 

evaluation for older versions of the software GC9000.

"RMGBus"

J-26 "baud"

27 "bits"

J-

28 "parity"

J-

Opt. Ser2 mode"

25 "

08 "RMGBus mode"

4.4.4

atch RMGBus master:

"Serial port 2"

3. Parameter AX-01 "AGA-10 source":

"Serial port 2"

4. Parameter AX-07 "maximum tim

Time in minutes, within which a new telegram has to come via RMGB

5. Parameter AX-08 "RM

GC9000: "RMGBus"

GC9300: "RMGBus 24 Komp."

6. Parameter AX-09 "Stre

Allows the setting of the

GBus mod

am selection":

desired streams.

eout":

e":

Data via Modbus (USM-GT-400 is SLAVE)

The gas data can be written to Modbus USM-GT-400 (USM-GT400 is Slave). Data source can be any field devices that operate as a Modbus master on the bus. The individual gas components will be written into the Modbus register of parameters AY- 20 to AY- 44 . To accept these values for the AGA-10 calculation parameters AX- will be set as:

11 h

as to be set to "Set new comp.". The parameters

30 Ultrasonic Flowmeter USM GT400 September, 4th 2018

4 Functional principle - Ultrasonic flow measurement

1. Parameter J-25 "Opt. Ser2 mode"

"Modbus"

2. The parameters of serial port 2 have to be adapted to the setting of the Modbus mas

J-26 "baud"

ter:

J-27 "bits

J-28 "parit

3. The to the setting of the master. Due to the configuration of the hardware it has to be set to RS232 or RS485, too:

J-29 "Modbus protocol 2"

J-30 M

4. Par

"Serial port 2"

5. Parameter J-25 "Opt. Ser

"Modbus Master"

Modbus has to be set to "RTU" or "ASC

odbus2 HW Fashion

ameter AX-01 "AGA-10

source":

2 mode"

II" according

Fig. 4-24: Import of data via Modbus

4.4.5

September, 4th 2018 Ultrasonic Flowmeter USM GT400 31

Import of data via Modbus (USM-GT-400 is Master)

USM-GT-400 gets the gas data via Modbus. It is Modbus master and asks continuously if new data are available. In this case, all the components are re-read and fed to the AGA-10 calculation. Parameter AX-10 "Modbus Master Target" sets which device the USM-GT-400 is addressing. If the GC9300 is chosen no Modbus register needs to be set at AZ-01 to AZ-54 for status and part of the gas component.

4 Functional principle - Ultrasonic flow measurement

1. Parameter AX-07 "maximum timeout":

Time [minutes] in which a new telegram must via RMGBus

2. Adjustment of the parame

J-26 "baud"

27 "bits"

J-

28 "parity"

J-

Modbus configuration:

J-29 "Modbus protocol 2"

Mas

ter has to be set to "RTU" or "ASCII"

J-30 M

Hardware configuration can be se RS485

J-31 "Modbus address 2"

Sla

4. Parameter AX-01 "AGA-10 source":

"Serial port 2"

5. Parameter AX-07 "maximu

odbus2 HW Fashion

ve address of the device with the gas data

r of serial port 2

lected as RS232 or

m tim

eout":

have come

Time [minutes] in which a new telegram must

Timeout: During the transfer of data, an ad available, generating a status signal if no new data arrived within the adjusted time.

6. Parameter AX-10

"Modbus Master Target": "GC9300"?

If yes, continue after 8, otherwise at 7

7. Parameter AZ-01 - AZ-54

Enter Modbus registers of the gas components and status

the slave device

justable time-out is

have come

Treatment of the gas data

The gas data are validated after transmission and optionally normalized. The AGA-10 gas equation components; it might even accept up to 24 components adding some (surplus) gas components to other components.

Neo-pentane: added

to n-pentane (see ISO 12213-2)

accepts up to 21 gas

Propene: add

Ethene: added to CO

32 Ultrasonic Flowmeter USM GT400 September, 4th 2018

ed to propane

(see ISO 12213-2)

4 Functional principle - Ultrasonic flow measurement

Hexane+: sum of n-hexane, n-heptane, n-octane, n-nonane and

n-decane. If there is only hexane+ in the samples and none of the above mentioned components, then hexane+ is added to hexane. In case one of these components is > 0

nored.

, then hexane is +

Normalization to 100 mol-%: If 100 mol-%, then the components are normalized to a total of  100 mol-% (can only be applied if the sum < 110 mol-%). Otherwise, Bit 0 in AW-0 will be set and the calculation takes place with 100 mol-% methane instead.

the sum of gas components isn‘t

is > 0 mol-% and 

1 "SOS calculation status"

Fig. 4-25: Sequence of gas components treatment

September, 4th 2018 Ultrasonic Flowmeter USM GT400 33

4 Functional principle - Ultrasonic flow measurement

Example 1

Fig. 4-26: Classification of gas components

The following examples demonstrate the classification of the gas components into the 21 AGA-10 components

Component Input

mol-%

Methane 35.0 35.0 70.0

Ethane 5.0 5.0 10.0

Propane 1.0 2.0 4.0

Propene 1.0 - -

iso-Pentane 1.0 - -

n-Pentane 1.0 2.0 4.0

Ethen 0.8 - -

Hexane+ (5.0) - -

Hexane 3.0 3.0 6.0

0.2 1.0 2.0

AGA-10 unnormalized mol-%

AGA-10  normalized mol-%

Nonane 2.0 2.0 4.0

Sum 50.0 50.0 100.0

34 Ultrasonic Flowmeter USM GT400 September, 4th 2018

4 Functional principle - Ultrasonic flow measurement

Example 2

Component Input

mol-%

Methane 80.0 80.0 80.0

Ethane 5.0 5.0 5.0

Propane 2.0 2.0 2.0

n-Butane 1.0 1.0 1.0

neo-Pentane 1.0 - -

n-Pentane - 1.0 1.0

Ethen 2.0 - -

Hexane+ 5.0

Hexane - 5.0 5.0

Nitrogen 4.0 4.0 4.0

Sum 100.0 100.0 100.0

- 2.0 2.0

AGA-10 unnormalized mol-%

AGA-10  normalized mol-%

Status code of AGA 10 calculation

Coordinate AW-01 gives the status code of the AGA-10 calculation.

This is a bit-coded value represente

d as a hexadecimal code. A value of "0000h" indicates a AGA-10 calculation with errors. The meaning of the individual bits are:

Bit Meaning

Components invalid

Sum of the un-normalized gas components  is <= 0 or > 110 mol-%

Timeout of new gas data exceeded

Within the defined time period in AX-07,

no new gas data

arrived. Possible reason:

• Time too short

• Communication interrupted

• transfer register has not been filled (for Modbus slav

e)

• Wrong RMGBus telegram or wrong stream selection

If there are new gas components latest within three times of the given timeout time, the error status will be reset.

Temperature Error

The temperature measurement is disturbed. Calculation will be done with the default value.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 35

4 Functional principle - Ultrasonic flow measurement

Pressure errors

The pressure measurement is disturbed. Calculation will be done with the default value.

Simulation active

4.5

915

The message "188: AGA-10" appears, if the status code is not 0. The Modbus master function is flexible in order to support PGC's other manufacturers, too; for example a Siemens PGC. Activating the RS 485 interface as Mod chapter 10.3.3.

Batch mode

Parameters E-01 "USE09 mode" is set t no data (results) of the DSP will be accepted

no value

Error AGA 10 calculation

There is an error within the AGA-10 culation is on hold. Reason may be wrong pressure or temperature values, ...

no value

bus master

o simulation =

calculation. The cal-

is described in

In general, the USM-GT-400 is set for an optimal operation without disturbance. The setting / changing of the batch mode allows adaptation to disturbed c at "high-turbulent" flow conditions as well as at "strong background noise" conditions. High turbu velocity profiles and rapidly changing asymmetries. A "smallest" batch mode should be chosen. At strong background noise, the signal detection can be disturbed, too. A "longer" batch mode increases the signal stability significantly permits a change of the signal duration.

• P1 Number of F-batches per

• ...

• P8 Number of F-batches per

The default values ar activated. All larger values are squared; F-Batch 2 means there are 4 signals superimposed. If the F-Batch is active the ring down time should be chosen as short as possible, preferably to 0 ms. The slow batch mode can be activated in coordinate AI-09; it is to be squared for all paths, too.

36 Ultrasonic Flowmeter USM GT400 September, 4th 2018

onditions. The setting allows operation

ent means highly distorted

The number of batches

measuring path 1

measuring path 8

e 2. 0 and 1 are identical; there is no batch

5 Safety

Safety

In this chapter you will receive information on using the device in a safe manner.

Contents 5.

5.1 Intended use ....................................................... 37

5.2 Layout of instructions

5.3 Qualification of the personnel

5.4 Safety instructions

5.4.1 Hazards during transporting ................................... 40

5.4.2 Hazards during installation

5.4.3 Hazards during start up

5.4.4 Hazards during cleaning

5.4.5 Hazards during maintenance and repairs

5.4.6 Hazards during operation

5.4.7 Hazards for operation in potentially 

explosive environments

....................................... 38

.......................... 39

............................................ 39

..................................... 41

.......................................... 43

......................................... 43

.............. 44

....................................... 45

.......................................... 45

5.1

5.5 Responsibilities of the operator ....................... 46

Intended use

The Ultrasonic Flowmeter USM GT400 device is used to measure the flow velocity of the gases in a pipeline and calculate th operating flow during running operation.

The Ultrasonic Flowmeter USM GT40 as ultrasonic gas meter or device in the following.

When used for its intended purpose, the ultrasonic ga suitable for use in potentially explosive areas classified as zone 1.

0 is hereafter designated

s meter is

September, 4th 2018 Ultrasonic Flowmeter USM GT400 37

5 Safety

Danger

Warning

Caution

Notice

The device complies with ignition protection class II 2 G Ex de IIB+H2 T6 Gb, ambient temperature between -40°C and +55° or Class 1, Division 1 Group B, C and code T5/T6 is -40°C to +40/+55°C..

The ultrasonic gas meter complies with the standards, directives and gu

 Chapter 14.5, „Standards, directives a

C

idelines.

page 178

bient temperature for

D, am

uidelines“ on

nd g

5.2

These technical limits must be maintained for a safe us ultrasonic gas meter:

 Chapter 13, „Technical specifications“ on page 159

Layout of instructions

The following instructions are used:

This warning instruction informs you of potentially hazardous situations that can occur as a result of incorrect operation or human error. If these situations are not avoided, they can lead to fatal or severest injuries.

This warning instruction informs you of possible hazardous situations that can occur as a result of incorrect operation or human error. If these situations are not avoided, they can lead to fatal or severe inju ries.

e of the

This warning instruction informs you of potentially hazardous situations that can occur as a result of incorrect operation or human error. these situations are not avoided, they can result in material damage to the device or the vicinity.

This information gives you tips on how to simplify your work. With this screen, you additionally receive further information on the device or the work process.

38 Ultrasonic Flowmeter USM GT400 September, 4th 2018

5 Safety

Danger

5.3

Qualification of the personnel

Operating personnel The operating personnel are to use and operate the device within

the scope of the intended purpose.

Maintenance personnel Work on the device must only be carried out by specialist person-

nel that can carry out the respective work assigned to them as a result of their applicable regulations. These specialist personnel are familiar with the legal guidelines for accident prevention and can evaluate and avoid possible risks by themselves.

• Mechanical installation must only be carrie

respectively qualified specialist personnel.

• Installation on electrical components m

out by qualified electricians. The specialist personnel require a training especially for

work

ing in potentially explosive env sonnel are persons that can ver education according to DIN VDE 0105, IEC 364 or a similar national standards..

•Initial start up personal (training by RMG) or by service personal from RMG.

• Maintenance and cleaning mus respectively qualified specialist personnel.

aining, knowledge and experience as well as the

d out by the

ly be carried

ust on

ironment. Specialist per-

ify a training / further

only be carried out by especially trained

must

t only be c

arried out by the

5.4

Safety instructions

Observe the following safety instructions

Non-observance of these safety instructions can lead to a risk of life and limb and health of the person as well as damage to the environment or property damage.

Note that the safety instructions in this operating instruction and on the device cannot cover all possible hazardous situations as the combination of different circumstances is impossible to predict. To simply follow the instr be sufficient enough to ensure for correct operation. Always be observant and also consider the following:

• Befor

• Always

e working with the device for the first time, read through this ope instructions carefully.

the plac

rating instruction and, in particular, follow the safety

keep the operating instructions within reach for use at

e of installation.

uctions

specified may not normally

September, 4th 2018 Ultrasonic Flowmeter USM GT400 39

5 Safety

• The operating instruction warns against the residual risks for

users, third parties, devices or other material assets. The safety instructions used refer to residual risks that cannot be avoided due to the design.

• For safe operation, t and followed.

• Oper

• Also obs

• Th

• Se

• Cha

• For safe operation, the technical spec

• For a safe operation, t

ate the device only in a sound state and when observing

operating instruction.

the

erve the local

and assembly guidelines.

e manufacturer is not responsible for any damage that

sult as a consequence of not observing the operating

re instruction.

rvice and maintenance work or repairs that are not scribed in the operating instruction must not be carried out

de without previous consultation with the manufacturer.

nges to the device are forbidden.

observed and followed. Performance limits must not be exceeded.

scope of its intended use.

he safety

he dev

instructions must be observed

legal accident prevention, installation

ifications must be

ice must only be used in the

5.4.1

The device is exposed to different life phases, su stallation, start upstart up, operation, maintenance and cleaning.

he following sections must be sorte

the life phases.

Hazards during transporting

The device may be damaged when lifting and putting down, tipping over or falling down. By disregarding the load bearing capacity of t severe injuries for persons in the vicinity.

• Li

ft the device only on the inten

• Before lifti

• Never stand under suspended loads.

• Observe the weight spe

meter at hand.

he lifting gear, the device may fall. There is a risk of

ng, make sure that the load is safely secured.

ch as, e.g., in-

d thematically according to

ded lifting eyes.

cifications for the ultrasonic gas

40 Ultrasonic Flowmeter USM GT400 September, 4th 2018

5 Safety

5.4.2

Hazards during installation

When you carry out work on electric systems in potentially explosive environments, incorrect work may

• Make sure that no potentially explo

hand before starting work.

If personnel that have insufficient qualifications carry they can incorrectly assess hazards. Explosions can occur.

• Ca

rry out the work only if you have the respec

tion and are a trained specialist pe

• Carry out the installation

standards:

• CAN/CSA-C22.2 No. 0-1191

• CSA C22.2 No. 30

• CSA C22.2 No. 142

•UL 916

• UL 1203

or similar national standards.

In potentially explosive atmo still remain as ignition sources for up to one minute after being switched off.

• Dis

connect the device from the power supply before starting

the ma

• Se

• Cordon-off t

and signs.

• Afte

sta connect to earth and short-circuit.

• Make

• Make sure that no stripped cable is loca

ing of the ultrasonic electronics and the connection box.

intenance work.

curing against reconnection.

he work area of the device, e.g., using a barrier

r switching off the device, wait at least one minute before

rting work. Ensure that the device is voltage-free. Then

sure that the insulation of t

lead to explosions.

sive atmosphere is at

out work,

tive qualifica-

rson.

according to the following

pheres, dangerous voltages can

he cables are intact.

ted outside the hous-

If the device is not installed according to the operating instructio then there is not enough explosion protection.

• Insta

If you do not use the appropriate may be damaged. The explosion protection is void.

• Us

• Make

• Use only an Atex or IECEx certified EMC c

September, 4th 2018 Ultrasonic Flowmeter USM GT400 41

ll the device according to the

e tools that have been recommended for the respective

k in the operating instruction.

wor

sure that the performance data of the power connec-

tion comply

nection in the protection categ metric thread (M20x1.5).

with the specificat

operating instruction.

tool and material, components

ions of the type plate.

able screw con-

ory increased safety with a

5 Safety

• Creepage distances and clearances must be maintained.

• Openings for line feeds not used

resistant, anti-self-loosening and twisting safe blind plugs.

• Th

e line insulation must reach to the terminals

ping, the conductor itself mus

• When closing the housing, take car effective in order to ensure for the protection category IP 66 / NEMA 4X.

• Hous

• Ob

• Use ca

ing cover or housing with dam

replaced immediately.

serve the applicable national guidelines in the individual

countries

bles that match th

e cable glands.

must be sealed by impact

. When strip-

t not be damaged.

e that the seals remain

aged thread must be

Gas may represent a risk to life and limb in dif pending on the gas type, different hazards may have an effect on you

with respective consequences. You may experience intoxica-

tion and injuries. There is also a risk of explosion.

• Befor

• Install t

• Ma

The device is exposed to high pressures. pressure are removed / assembled, the high pressure may escape suddenly causing the component to fly danger!

• Install t

• With systems subjected to pressure:

If gas escapes at high temperature, there is a risk of life threate ing burns. You may suffer burn injuries in the event of contact with h

ot surfaces.

• Allow the comp

• W

e working, inform yourself about the media in the

tem.

sys

he device only when the system is switch

depressurized and secured.

ke sure that there is no potentially explos

at the installation location.

he device only when the system is dep

have t

he assembly work (Hot-Tap

specially trained personnel.

nts to cool down before working in the

one

system.

ear personal protective equipment.

ping) only carried out by

ferent ways. De-

ed off,

ive gas mixture

If components under

around. Mortal

ressurized.

connections not required during ope

If escape. Risk of explosion and intoxication!

• Before st plugs according to 94/9/EC.

• Rep tation with certified blin

500.

42 Ultrasonic Flowmeter USM GT400 September, 4th 2018

rt up, seal all open connections with certified blind

lace the blind plugs that have been installed for transpor-

d plugs according to 94/9/EC or NEC

ration remain open, gas will

5 Safety

5.4.3

5.4.4

Hazards during start up

If personnel that have insufficient qualifications carry out work, they can incorrectly assess the hazards. Explosions can occur.

• Ca

rry out the work only if you have the respec

tion and are a speciali

If the device is not sealed correctly during installation then gas

y escape. Explosions can occur. Danger of poisoning!

• Check th

• Take the system immediately out

leak.

e co

Hazards during cleaning

If the device is not cleaned according to the operating instruction then the device may be damaged.

• Clean

If you do not use the appropriate tool, components may be damaged. The explosion protecti

• Use tools that have been recommended for the respective

the device only according to

wor

k in the operating instruction.

tive qualifica-

st person.

nnections for leaks.

of operation if you detect a

the operating instruction.

on is void.

Cleaning agents / corrosion protec health.

• Always wear

• Ensure for good ventilation and do not inhale vapors!

• Observe the safety data sheet!

otective gloves and eye protection.

tion used may be harmful to

September, 4th 2018 Ultrasonic Flowmeter USM GT400 43

5 Safety

5.4.5

Hazards during maintenance and repairs

If personnel that have insufficient qualifications carry out work, They can incorrectly assess hazards when working. Explosions can occur.

• Carry out the work tion and are a trained specialist person.

Flange joining elements, pressure tapping screw connections

valves must not be removed if the system is subject to pres-

and sure. Components may dangerously spray cause intoxication and burns. Risk of explosion!

• Fo

r the flange connection, use only the matching combina-

of screw bolts, nuts and sea

tion tightening torque of the flange connection for this combination.

• In do

• Use only genuin

ing so, observe the specific

facturer or system operator.

e spare parts from RMG. 

It is forbidden to install spare pa turers. It voids all guaran explosion protection is no longer ensured.

if you have the respective qualifica-

only

ls. Select the appropriate

ations of the system manu-

rts from third-party manufac-

tees and claims for guarantee. The

. Escaping gas may

When working on live devices in potentially explosi spheres, resulting sparks may lead to an explosion.

• Only

• Make sure that there is no potentially explosive atmosphere

• Afte

• Chec

Sp ar

Under normal operating conditions, the transducer cannot be accessed from the outside, thus no sparks can or friction of the transducer against hard materials.

• Th

• pr

work on de-energized devices when in potentially explo-

sive atmosph

before s

r working provide on pressurized components, leaks may

. Escaping gas may lead to intoxication, Risk of

occur explosion!

k all components for leaks!

ecial requirements for a safe operation in potentially explosive

eas classified as zone 1:

e transducers are made from tit rub against the transducers, this can generate a spark thus leading to an explosion!

event hard objects from kno

transducers.

eres (except for intrinsically safe circuits).

tarting work.

anium. If objects knock or

cking or rubbing against the

ve atmo-

result from impacts

Also observe these warning instructions:

 „Hazards during installation“ on page 41

44 Ultrasonic Flowmeter USM GT400 September, 4th 2018

5 Safety

5.4.6

Hazards during operation

If the device is loaded with a pressure that is too high, components may leak and burst.

• Never

Flange joining elements, pressure t valves must not be removed if the system is subject to pressure.

Components may dangerously spray. Escaping gas may cause intoxication and burns. Risk of explosion!

• Obs

The device can be heated or cooled gas. You may be subject to burns when making skin contact with the device.

• W

Breakages or cracks may be caused to the device if the gas temperature or ambient temperature is o temperature ranges. Gas escaping may cause intoxication and burns. Risk of explosion!

• Never

exceed the maximum operating p

cations on the type plate).

erve the specifications of the system ma

system operator.

ear protective gloves that protect against heat and cold for

work.

this

exceed the maximum gas temp

ent temperature of 80°C.

ressure (see specifi-

apping screw connections and

nufacturer or

by the temperature of the

utside the specified

erature and / or ambi-

5.4.7

Hazards for operation in potentially explosive environments

If the device is operated with damaged or missing components then gas may escape. In event of damaged threads, the ignition penetration safe gap is no longer guaranteed. Escaping gas may cause intoxication and burns. Risk of explosion!

• Op

erate the device only in a so

If you carry out technical changes to the can no longer be guaranteed.

• Use

the device only in its

und and complete state.

device, safe operation

original state.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 45

5 Safety

5.5

Responsibilities of the operator

• You being the operator must ensure that only sufficiently

qualified personnel work on the device.

 „Qualification of the personnel“ on page 39

• M

ake sure that all employees that are using the device have

ead and understood this operating instruction. Moreover, you are also obliged to train the personnel at regular intervals and inform them of the hazards.

• Mak

• The res

• Provide the personnel with the ne

• Using suitable meas

e sure that all work on the de qualified persons and checked by responsible specialist personnel.

ponsibilities for installation, operation troubl

ing, maintenance and cleaning must b

equipment.

 „Qualification of the personnel“ on page 39

res, ensure that that constructive risks are ruled out when using the device. Inform your personnel about the risks when using the device.

vice is only carried out by

e clearly specified.

cessary protective

eshoot-

46 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Transport and storage

In this chapter you will receive information on the scope of supply, transport and storage of the device.

Content 6.

6.1 Transport ............................................................ 47

6.1.1 Scope of supply ...................................................... 48

6.1.2 Transporting the device

6.1.3 Unpacking the device

6.1.4 Disposal of packaging material

6.1.5 Prior to installation

6.1.6 Removing the transporting locks

6.2 Packing the device for transportation ............. 55

6.3 Storage

6.3.1 Packing the device for storage ............................... 63

6.3.2 Checking the device after storage

............................................................... 62

.......................................... 49

............................................. 49

.................................................. 53

.............................. 53

............................ 53

.......................... 63

6.1

Transport

The device will be packed to customer-specifics according to the transport requirements. In this chapter you will receive information on the standard packaging

of the device.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 47

6 Transport and storage

6.1.1

Scope of supply

The scope of supply may deviate depending on the options of the orders.

The following are included in the scope of supply:

Component Quantity

Ultrasonic gas meter USM GT400 (including US-Electronic)

Extension box

In countries where ATEX / IECEx

(

standards apply, connected at the ultrasonic electronic)

Special tools to open the US electronic 2

Inlet and outlet spool piece 1 (optional)

Certificate of flow calibration 1

Certificate of material used 1

Certificate of stability 1

Certificate of density 1

Software RMGView

Operating instruction of the device 1

Screws and set of blank plugs 1

USM

48 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

6.1.2

Transporting the device

A Euro pallet B Retaining bolts x 2 C Ultrasonic gas meter D Retaining strap x 2 E Timber wedge x 2

6.1.3

Fig. 6-1: Device secured on a Euro pallet

The device is as standard supplied on a Euro pallet (A). The device can be protected by a customer-specific outer packaging. To secure the devic device (C) is supplied with retaining straps (D) and bolted to timber wed addition

The device can be transported on the pallet using a lifting cart or a fork lift.

ges (E). The retaining bolts (B) of the device provide al support.

Unpacking the device

 Remove the outer packaging

The outer packaging of the device is suite cifics in order to protect the de influences from the environment during transport.

Options for the outer packaging

• sea-proof wooden crate

• cardboard packagings

e against tipping-over and rolling away, the

d to customer spe-

vice against damage or

can be, for example:

1 Remove the outer packing.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 49

6 Transport and storage

2 Recommendation: store the outer packaging for the future or

for returning to RMG for service work.

A Retaining bolts

Fig. 6-2: Retaining bolts of the device

3 Make sure that the retaining bolts (A) are screwed in, if

necessary.

50 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Warning

 Removing the device from the Euro pallet

A Lifting eyes B Lifting gear chains

Fig. 6-3: Attaching the lifting gear

Risk of injury during transport

The device may be damaged when lifting and putting down, tipping over or falling down. By disregarding the load bearing capacity of the lifting gear, the device may fall. There is a risk of severe injuries for persons in the vicinity.

tended

• Lift the device only on the in

• Before lifting, make sure that the load is safely secured.

• Never stand under suspended loads.

• Observe the weight specifications for the ultrasonic gas me hand.

lifting eyes.

ter at

1 Attach a suitable lifting gear (B) to the lifting eyes (A) of the

device.

2 Tension the chain of the lifting gear slig

htly to secure the

device.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 51

6 Transport and storage

Warning

A Timber wedge B Tension straps

Fig. 6-4: Remove the timber wedges and retaining straps

3 Undo and remove the tension straps (B).

Risk of injury during transport

• Lift the device only on the intend

• Before lifting, make sure that the load is safely secured.

• Never stand under suspended loads.

• Observe the weight specifications for the ultrasonic ga hand.

ed lifting

eyes.

s meter at

4 Carefully lift the device with a lifting gear until the Euro pallet

can be pulled from underneath the device.

5 Pull the Euro pallet from u

6 Recommendation: store the Euro pallet for t

nder the device.

he future or for

returning to RMG for service work.

52 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Notice

6.1.4

6.1.5

Disposal of packaging material

If the packaging material and the Euro pallet are no longer required, dispose of the material in an environmentally responsible manne

r according to the country-specific standards and

guidelines.

Prior to installation

The transport locks must only be removed once the device has been installed in the system and the device has been transported to the installation location.

Damage to the device from contamination and humidity

If transport locks are removed too early, contamination and humidity may enter the device. The device could be damaged.

• Disassemble the transport device.

The following belong to the transport locks:

• Blind plug

• Protective sticker

• Retaining bolts

mmendation: remove the retaining bolts

solutely necessary. This is the only way to ensure that the

ab device does not tip over or roll away after being installed.

• Cor

rosion protection mat

locks immediately before installing the

only if it is

6.1.6

September, 4th 2018 Ultrasonic Flowmeter USM GT400 53

Removing the transporting locks

The removal of the transport locks is described here on the example of a connection or flange. The transport locks also have to be rem located.

 Removing the pr

oved from all connections where the transport locks are

otective sticker / blind plugs from the

flanges

The flanges are supplied sealed with a protective sticker blind plug made of plastic.

6 Transport and storage

Removing the protective sticker

A Protective sticker B Flange

Fig. 6-5: Removing the protective sticker

1 Release the protective sticker from the sealing surface of the

flange.

2 Remove any residual adhesives or other impu

sealing surfaces of the flange using a gentle cleaning agent.

Remove the blind plugs 1 Pull the blind plugs out of the openings.

rities from the

54 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

 Remove the corrosion protection mat

The inside of the device is protected using tection mat. The corrosion protection mat must be before installation.

A Position of the corrosion protection mat

Fig. 6-6: Corrosion protection mat in the device

a corrosion pro-

removed

6.2

1 Remove the corrosion protection mat (A) from the device.

Packing the device for transportation

The device must be packed to customer-specifics according to the transport requirements. In this chapter you will receive information as to how the device is as standar

For packaging, use the original packaging mater set that was supplied with the device.

If you no longer have the original packaging material and sealing set, you ca quired from RMG.

RMG service would be pleased to consult you as to how the device should be packed.

You need the following for standard packaging:

• Euro pallet with timber wedges (with the original packaging, the timber pallet).

• T

• Transport locks

• Sealing set (blind plugs)

n order the packaging material and sealing set re-

wedges are already pre-mounted on the Euro

wo tensioning straps

d packed.

ial and sealing

September, 4th 2018 Ultrasonic Flowmeter USM GT400 55

6 Transport and storage

Caution

• Acid-free corrosion protection agent, e.g., ESSO RUST BAN 397, Mobil Oil Tecrex 39

 Ensure for a safe position of the device

Risk of injury from missing retaining bolts

If the device is put down without the retaining bolts, it can tip over or roll away. Servere injuries may occur.

• Before starting work, make sure that the retaining bolts are screwed in.

A Retaining bolts with counter-nuts

Fig. 6-7: Check the retaining bolts

The retaining bolts are screwed into the device ex-factory. These ensure for a safe position.

1 Make sure that the retaining bolts are screwed in and that the

counter

-nuts are secured.

Recommendation: remove the retaining bolts only if it is absolutely neces

sary. This is the only way to ensure that the

device does not tip over or roll away after being installed.

56 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Warning

 Lifting the device onto the Euro pallet

A Lifting eyes B Lifting gear chains

Fig. 6-8: Attaching the lifting gear

Risk of injury during transport

tended

• Lift the device only on the in

• Before lifting, make sure that the load is safely secured.

• Never stand under suspended loads.

• Observe the weight specifications for the ultrasonic gas me hand.

lifting eyes.

ter at

1 Attach a suitable lifting gear (B) to the lifting eyes (A) of the

device.

2 Tension the chain of the lifting gear slig

htly.

3 Undo the bolted connections from the system so that the

vice can be lifted out.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 57

6 Transport and storage

Warning

A Retaining bolts B Tension straps C Timber wedge

Fig. 6-9: Secure the device on the Euro pallet

4 Place the Euro pallet under the device.

Without the retaining bolts (A) the flange must be guided

en the timber wedges (C).

betwe

Risk of injury during transport

• Lift the device only on the intended lifting

• Before lifting, make sure that the load i

• Never stand under suspended loads.

• Observe the weight specifications for the ultrasonic ga hand.

eyes.

s safely secured.

s meter at

5 Carefully place the device on the Euro pallet with the lifting

gear.

6 Secure the device using the tensioning straps (B).

e tensioning straps must have

a tight fit and must secure

the device.

58 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Notice

 Place the corrosion protection mat inside the device

Damage to the device from corrosion

If the device is not protected against corrosion, the function of the device may be affected.

• Place the corrosion protection mat inside the devi

ce.

A Position of the corrosion protection mat

Fig. 6-10: Corrosion protection mat in the device.

1 Clean the device and protect all blank parts against corrosion

with an acid-free corrosion protection agent, e.g., ESSO RUST BAN 397, Mobil Oil Tecrex 39.

 Chapter 11.7, „Cleaning the device“ on page 148

2 Place the corrosion protection mat (A

) inside the device.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 59

6 Transport and storage

 Provide the connection box (ATEX / IECEx) with blind

plugs

A Wrench B Screwed cable gland C Blind plug

Fig. 6-11: Mount the blind plugs

1 Insert the blind plugs (C) into the connection.

2 Tighten the screw connection (B) with a suitable wr

The following sealing bolts supplied must be used in countries where CSA / FM guidelines apply. If only transport is taking place, you can use 1/2" or 1" screws with appropriate length as an alternative.

ench (A).

60 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

 Applying the protective sticker / blind plugs to the

flanges

Sealing the flange with protective

ickers

The flanges must be sealed with a protective sticke plug made of plastic.

A Protective sticker B Flange

Fig. 6-12: Applying the protective sticker

1 Clean the sealing area with grease remover.

r or blind

Sealing the flange wit

The sealing surface must be free of grease and contamination.

ick the protective sticker (A) onto the sealing surface

2 St

flange (B).

h blind plugs 1 Inser

the blind plugs have a tight fit.

of the

t the blind plugs into the opening of the flange so that

September, 4th 2018 Ultrasonic Flowmeter USM GT400 61

6 Transport and storage

Notice

Danger

 Applying the outer packaging to the device

Damage caused to the device from incorrect storage / transport

If the device is not protected correctly by the packaging material, dirt or humidity may enter the device and damage it.

• Pack the device according to the instruction. Consider the special transport requirements on the packaging mate-

• rial, e.g., for transpor

• Please contact RMG service in case of doubt.

Use the original packaging that was supplied along with the device. Please contact RMG service if you have any questions.

Options for the outer packaging can be, for example:

• sea-proof wooden crate

• cardboard packagings

t overseas.

6.3

Storage

1 Protect the device in the outer packaging against environ-

mental influences.

In this chapter you will receive information on the correct storage of the device. You are also provided with information that must be observed when storing for long periods.

Mortal danger from damage in the warehouse

If the device is stored for longer than one year, the device may be damaged from incorrect outer packaging or securing of the device. In potentially explosive environment, a defective device may lead to an explosion. Danger of poisoning!

• Avoid long storage times.

ice if

• Have the device checked by RMG serv ger than one year. For this purpose, send

the storage time is lon-

the device to RMG.

62 Ultrasonic Flowmeter USM GT400 September, 4th 2018

6 Transport and storage

Notice

Danger

6.3.1

6.3.2

Packing the device for storage

Damage caused to the device from incorrect storage / transport

If the device is not protected correctly by the packaging material, dirt or humidity may enter the device and damage it.

• Pack the device according to the in

• Consider the special transport requirements on the packaging material, e.g., for transport overseas.

• Please contact RMG service in case of dou

1 Packing the device.

 „Packing the device for transportation“ on page 55

2 Observe the approved ambient temperature for storage.

 Chapter 13.1, „Performance data“ on page 160

Checking the device after storage

Mortal danger from damage in the warehouse

• Avoid longer storage times.

• Have the device checked by RMG service if the ger than one year. For this purpose, send the device to RMG.

struction.

bt.

storage

time is lon-

 Checking the device for any signs of damage

There is a high risk to life and limb if a dam

aged device is

used.

The following damage can compromise safety and the function of the device:

• notches on the flange sealing su

rfaces

• corrosion in the device or on the sealing surfaces

• cracked glass of the viewing window

• clouded glass of the viewing window

• cracks, flaking on the housing

he covers

or t

• flaking paint

1 Check that the device is intact by

If you discover that there is, e.g., any d age to the device, the device may only b

a visual inspection.

amage or other dam-

e re-used after

consulting RMG.

2 If damaged: please contact RMG services.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 63

6 Transport and storage

64 Ultrasonic Flowmeter USM GT400 September, 4th 2018

7 Construction and Planning

Construction and Planning

In this chapter you will receive information on how you can integrate the device into the system and what you have during this process.

Contents 7.

7.1 Connection flanges ........................................... 65

7.2 Seals

7.2.1 Flat seal .................................................................. 67

7.2.2 Grooved gaskets

7.2.3 Spiral seals

7.3 Screws ................................................................ 70

7.4 Installation possibilities

7.4.1 Dependency on the gas flow direction ................... 71

7.4.2 Two devices series connecte

................................................................... 66

.................................................... 68

............................................................. 69

.................................... 71

d (Face to Face) ....... 74

to observe

7.1

7.5 Flow computer ................................................... 75

Connection flanges

The devices from RMG are equipped with connection flanges.

The joining dimensions of the flanges for the pipelines to be connected must correspond to the con device flanges.

• ANSI

• DIN press

pressure stages: The flange joining dimensions comply

the standard ASME B 16.5.

with

re stages: The flange joining dimensions comply

with the standard DIN EN 1092.

nection dimensions of the

September, 4th 2018 Ultrasonic Flowmeter USM GT400 65

7 Construction and Planning

Danger

Notice

7.2

Seals

Escaping gas from incorrect seals

If incorrect flange seals are used for several ultrasonic gas meters, potentially explosive gas mixtures can escape due to leaks. Risk of intoxication and explosion! Moreover, the pressure of the flange increases with the improper tightening of the screw bolt.

• Make sure that the flat seal does face into the pipeline.

Malfunctions from incorrect seals

If flange seals are used for ultrasonic gas meters that protrude into the pipeline, the measuring accuracy may be influenced.

• Make sure that the flat seal does face into the pipeline.

The durability of the flange connections has been verified for seals with the following maximum material values according to the AD2000 regulations.

Flat seals: k0 x KD = 20 x bD | k1 = 1.3 x bD (N/mm)

not protrude over the sealing sur-

Grooved gaskets: k0 x KD = 15 x bD | k1 = 1.1 x bD (N/mm)

Spiral seals: k0 x KD = 50 x bD | k1 = 1.4 x bD (N/mm)

Octagonal ringjoint seal::

KD = 480 N/mm

66 Ultrasonic Flowmeter USM GT400 September, 4th 2018

7 Construction and Planning

7.2.1

DN  in mm (inch)

80 (3) 90 (3.54)

Flat seal

d1 in mm (inch)

89 (3.5)/ANSI150

Fig. 7-1: Dimensions of the seal

d1 = Inside diameter d2 = Outside diameter x = Seal thickness 1.5 to 5 mm

PN 10 PN 16 ANSI 150 PN 25 PN 40

d2 in mm (inch)

142 (5.59) 142 (5.59) 136.5 (5.37) 142 (5.59) 142 (5.59)

100 (4) 115 (4.53) 162 (6.38) 162 (6.38) 175 (6.89) 168 (6.61) 168 (6.61)

150 (6) 169 (6.65) 218 (8.58) 218 (8.58) 222 (8.74) 225 (8.86)

200 (8) 220 (8.66) 273 (10.75) 273 (10.75) 279 (10.98) 285 (11.22) 292 (11.52)

250 (10) 274 (10.79) 328 (12.91) 330 (12.99) 340 (13.39) 342 (13.46)

300 (12) 325 (12.80) 378 (14.88) 385 (15.16) 410 (16.14) 402 (15.83) 418 (16.46)

400 (16) 420 (16.54) 490 (19.29) 497 (19.57) 514 (20.24) 515 (20.28)

500 (20) 520 (20.47) 595 (23.43) 618 (24.33) 607 (23.90) 625 (24.61) 628 (24.72)

600 (24) 620 (24.41) 695 (27.36) 735 (28.94) 718 (28.27) 730 (28.74) 745 (29.33)

225 (8.86)

353 (13.90)

547 (21.54)

September, 4th 2018 Ultrasonic Flowmeter USM GT400 67

7 Construction and Planning

7.2.2

Grooved gaskets

Fig. 7-2: Dimensions of the seal

d1 = Inside diameter d2 = Outside diameter x = Seal thickness 1.5 to 5 mm

ANSI 300 / ANSI 600 PN 64

DN  in mm (inch)

80 (3) 98.4 123.8 95 121

100 (4) 123.8 154.0 11 8 144

150 (6) 177.8 221.7 170

d1 in mm

d2 in mm

d1 in mm

d2 in mm

204

200 (8) 228.6 266.7 220 258

250 (10) 282.6 320.7 270

300 (12) 339.7 377.8 320 365

400 (16) 422.3 466.7 426

500 (20) 530.2 581.0 530 578

600 (24) 631.8 682.6 630 680

315

474

68 Ultrasonic Flowmeter USM GT400 September, 4th 2018

7 Construction and Planning

7.2.3

DN  in mm (inch)

80  (3)

Spiral seals

Fig. 7-3: Dimensions of the seal

d1 = Inside diameter of the centering ring d2 =Inside diameter of the seal d2 = Outside diameter x = Seal thickness 1.5 to 5 mm

ANSI 300 PN 64 ANSI 600

d1 in mm (inch)

81  (3.19)

d2 in mm (inch)

101.6 (3.98)

d3 in mm (inch)

120.7 (4.75)

d1 in mm (inch)

86 (3.39)

d2 in mm (inch)

95 (3.74)

d3 in mm (inch)

119 (4.69)

d1 in mm (inch)

81 (3.19)

d2 in mm (inch)

101.6 (3.98)

d3 in mm

(inc

120.7 (4.75)

100  (4)

150  (6)

200  (8)

250 (10)

300 (12)

400 (16)

500 (20)

600 (24)

106.4 (4.19)

157.2 (6.19)

215.9 (8.5)

268. (10.6)

317.5 (12.5)

400

5.7)

500 (19.7)

603. (23.8)

3

127.0  (5.00)

182.6  (7.19)

233.4  (9.19)

287.3  (11.31)

339.9  (13.38)

422.4  (16.63)

525.5  (20.69)

628.7  (24.75)

149.4  (5.88)

209.6  (8.25)

263.7 (10.38)

317.5 (12.50)

374.7 (14.75)

463.6 (18.25)

577.9 (22.75)

685.8 (27.00)

108 (4.25)

162 (6.38)

213 (8.39)

267 (10.5)

318 (12.5)

414 (16.3)

518 (20.4)

618 (24.3)

120 (4.72)

174 (6.85)

225 (8.86)

279 (10.98)

330 (12.99)

426 (16.77)

530 (20.87)

630 (24.80)

144 (5.67)

20 (7.87)

257 (10.12)

315 (12.40)

366 (14.41)

466 (18.35)

574 (22.60)

674 (26.54)

120.7 (4.75)

174.8 (6.88)

225.6 (8.88)

274.6 (10.81)

327.2 (12.88)

412.8 (16.25)

520.7 (20.50)

628.7 (24.75)

120.7  (4.75)

174.8 (6.88)

225.6 (8.88)

274.6 (10.81)

327.2 (12.88)

412.8 (16.25)

520.7 (20.5)

628.7 (24.75)

149.4 (5.88)

209.6 (8.25)

263.7 (10.38)

317.5 (12.50)

374.7 (14.75)

463.6 (18.25)

577.9 (22.75)

685.8 (27.00)

September, 4th 2018 Ultrasonic Flowmeter USM GT400 69

7 Construction and Planning

Notice

7.3

Screws

Temperature range for bolts and nuts

-40°C to +80°C

Pressure stages Version 1 Version 2 Version 3

PN10, PN16, PN25, PN40, PN64

Bolts according to DIN EN ISO 4014

material 25CrMo4, nuts

–

according to DIN EN ISO 4032 of

rMo4

20 Grade L7,

rding to

20 Grade

Bolts according to ANSI B1.1 of material 42CrMo4

, nuts according to ANSI B1.1 of material 42CrMo4

Bolts with reduced shank according to DIN 2510 of materia according to DIN 2510 of materia

ANSI150, ANSI300, ANSI600

material 25C

Bolts according to ANSI B1.1 of material ASTM A 3 nuts acco ANSI B1.1 of material ASTM A 3

The stability of the flange connection was verified using the screws list

ed above in conjunction with the seals listed in Chapter 7.2. Other screw / flange versions have not been inspected.

l 25CrMo4, nuts

l 25CrMo4

Variant 3 bolts with reduced shank may

only be used for devices within the area of PED (Pressure Equipment Directive) application.

DN80

Screws are provided by RMG for the USM-GT400 for diameter DN80.

Depending on the flange type the following hexagonal bolts are used for DN80:

PN16/10 PN40/25 PN64 ANSI150 ANSI300 ANSI600

DIN EN 24014 (DIN931 ISO4014) M16 x 48 – 8.8 L=48 mm or material: 25CrMo4  galvanized

DIN EN 24014 (DIN931 M16 x 52 – 8.8 L=52 mm or material: 25CrMo4  galvanized

ISO4014)

DIN EN 24014 (DIN931 ISO4014)

M16 x 56 – 8.8 L=56 mm or material: 25CrMo4  galvanized

5/8“ - 11 UNC 2A x 2 1/8“

L=54mm (2 1/8“)

A320 Grade7

UNC

These screws can only be used down to -10°C.

These screws can be used down to -46°C.

or material: 42CrMo4 galva-

nized

3/4“ - 10 UNC 2A x 2 1/4“ L=54mm (2 1/4“)

A320 Grade7

UNC or material: 42CrMo4 galva-

nized

3/4“ - 10 UNC 2A x 2 5/8“ L=54mm (2 5/8“) UNC A320 or material: 42CrMo4 galva-

nized

Grade7

70 Ultrasonic Flowmeter USM GT400 September, 4th 2018

7 Construction and Planning

7.4

7.4.1

Installation possibilities

You have different possibilities when installing the device into your system. Please verify a proper inner diameter of any pipe that is connected to the meter.

–See „Inner diameter of connecting spool pieces“ on

page 168

Dependency on the gas flow direction

In order for the installation to correspond to the requirements of the Measurement Instrument Directive 2004/22/EC (MID) or Measurement Canada (MC), the device must be installed with an inlet and outlet piping.

With this installation, the device can be used for surements and for secondary measurements.

Unidirectional operation

calibrated mea-

A Temperature sensor

Fig. 7-4: Unidirectional operation

September, 4th 2018 Ultrasonic Flowmeter USM GT400 71

7 Construction and Planning

A Flow conditioner B Temperature sensor

Fig. 7-5: Unidirectional operation - compact installation

72 Ultrasonic Flowmeter USM GT400 September, 4th 2018

A Temperature sensor

Fig. 7-6: Bidirectional operation

7 Construction and Planning

Bidirectional operation

A Flow conditioner B Temperature sensor

Fig. 7-7: Bidirectional operation - compact installation < DN 300 (12")

A Flow conditioner B Temperature sensor

Fig. 7-8: Bidirectional operation - compact installation DN 300 (12")

September, 4th 2018 Ultrasonic Flowmeter USM GT400 73

7 Construction and Planning

Notice

7.4.2

Two devices series connected (Face to Face)

You can install one or several devices in series.

Malfunctions from pairing the devices incorrectly

If the devices do not match one-another for these installation possibilities, incorrect measurements may occur.

• Please consult RMG if a Face-to-Face installation is possible with the desired devices and number of devices.

A Tapered bore B Inner diameter

Fig. 7-9: Face-to-Face installation

With this installation option, two or several devices are connected with one-another via the flanges. Third-party manufacturer devices can also be connected to RMG devices.

For this purpose, a tapered bore can be applied to the flanges on the inlet and outlet piping.

The

flanges that are used to connect the devices with one-another do not require a tapering. For third-party manufacturer devices, you have to check if a tape

For the device with the smaller inner diameter it is mandatory to use a tapering.

If two RMG devices are connected with one-another, the inner diameter must be continuously the same. Different siz cannot be connected to one-another.

ring is required.

ed devices

74 Ultrasonic Flowmeter USM GT400 September, 4th 2018

7 Construction and Planning

7.5

Flow computer

If required, you can connect one or two flow computers to the device.

Follow the installation g

 Operating instructions of the flow computer

e 2 interfaces RS485-1 and RS485-2 have the same features

and you ma

However, the RS 485-1 (in contrary permit a parameterizable byte sequence for the data types Long and Float. We therefore recommend that you use the RS 485-1 for the DZU protocol and the RS 485-2 for instance F communication. You may find more in

Flow computer from RMG The device is compatible with the following flow computer series

from RMG

• ER

• ERZ 24

If you want to use the flow computer from RMG specified above,

do not have to carry out any configurations. The flow comput-

you ers from RMG can directly process the gas meter from RMG directly. For this purpose, the flow computer has to be connected to the digital interface RS485-1 in order to allow all diagnosis functions to be used. If you want to install an additional flow computer for reasons of security, this must be connected via the interface RS485-2.

y change in the following1 to 2 (and 2 to 1) freely.

00 NG

Z 20

uidelines of the flow computer:

to the RS 485-2) does not

rmation in chapter 8.3.

protocol of the ultrasonic

Flow computer from third-party

manufacturer

September, 4th 2018 Ultrasonic Flowmeter USM GT400 75

Flow computers from third-party manufacturers can be connected to the device. These can only be conn interface RS485-2. This interface communicates via a Modbus protocol. In order to be able to use all diagnosis functions, the Modbus must be configured. You can also use the high-frequency outputs pulse 1 and 2. When par the maximum possible gas flow rate correlates to a maximum frequency of 2 kHz. All diagnosis functions cann interface.

If you are using a third-party manu configure the flow computer.

ected to the digit

meterizing, take care that

ot be used via this

facturer device, you have to

7 Construction and Planning

Explosive atmospheres

Device group II zone 1

Maximum distance 500 m / 1640 ft

Safe area

or Class1, Division1

Connecting a flow computer for example an ERZ2000 / ERZ2400

Fig. 7-10: Connection diagram for connection of a flow computer fo r example an ERZ2000 / ERZ2400

The cable length must not exceed a length of 500 meters / 1640 feet.

More information on the installation found here:

 Oper

ating instructions of the flow computer

of a flow computer can be

76 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

Installation

In this chapter you are provided with information on how you can correctly install the device and what you have to observe during the process.

The tasks of the chapter described must only be carried out by trained and certified personal.

Content 8.

8.1 Assembly work preparations ............................ 78

8.2 Installation of the device

8.2.1 Mounting the inlet and outlet piping ........................ 80

8.2.2 Installation of the connection box

8.3 Connecting the device electrically ................... 84

8.3.1 Connecting the power supply ................................. 89

8.3.2 Digital interfaces of USM-GT400

8.3.3 Connecting the computer for RMGView

8.3.4 Connecting the flow computer

8.3.5 Connection of external DSfG

8.3.6 Interface converter

8.3.7 Connecting the device to earth

................................... 80

........................... 81

............................ 90

USM

.......... 91

................................ 92

-Device-F via Modbus ....

............................................... 108

............................. 110

8.4 Installing the pressure connection ................ 112

8.5 Outdoor installation

September, 4th 2018 Ultrasonic Flowmeter USM GT400 77

......................................... 114

8 Installation

Danger

Warning

Caution

8.1

Assembly work preparations

Mortal danger from electric current

In potentially explosive environments, dangerous voltages can still remain as ignition sources for up to one minute after being switched off.

• Disconnect the device from the power supply before star maintenance work.

• Secure the device against being switched back on.

• Cordon-off the work area of the device, e.g., using a b signs.

• After switching off the device, wait at least one minute before starting work. Ensure that the device is volt earth and short-circuit.

Mortal danger from components under pressure

Flange joining elements, pressure tapping screw conn valves must not be removed if pressure is applied to the device. Components may be flung-around. Gas escaping may cause intoxication

burns. Risk of explosion!

and

• Carry out work on the device only when it is in a voltage-free state, is vented and without pressure.

Mortal danger from incorrect work

Hazards can only be recognized and avoid sonnel. If work is carried out by persons who have not been trained these special activities in potentially explosive areas, they may cause an explosion.

• Have installations only carried out by especia (expert according to DIN VDE 0105, IEC 364 or similar national standards).

Mortal danger from damaged sealing surfaces

If sealing surfaces are damaged, e.g., from notches or scratch leaks may occur. Risk of intoxication and explosion!

• Install only an undamaged device.

age-free. Then connect to

ed by specially trained per-

ting the

arrier and

ections and

for

lly trained personnel

es,

Risk of injury during transport

• Lift the device only on the intend

• Before lifting, make sure that the load is safely secured.

• Never stand under suspended loads.

• Observe the weight specifications for the ultrasonic ga hand.

Risk of injury from missing retaining bolts

If the device is put down without the retaining bolts, it can tip over or roll away. Serious injuries may occur.

• Before starting work, make sure that the retaining bolts are screwed in.

ed lifting

eyes.

s meter at

78 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

Notice

Damage to the device when used as a climbing aid

If the device is used as a climbing aid, components may be damaged.

•Do not use the device as a climbi

• Use a suitable non-slip step that allows you to easily and safely reach the components.

 Carry out preparatory work

1 Unpack the device.

 Chapter 6.1.3, „Unpacking the device“ on page 49

ng aid.

For ATEX / IECEx

2 Remove the transporting lock

 Chapte

r 6.1.6, „Removing the transporting locks“ on

page 53

A Wrench B Screwed cable gland C Blind plug

Fig. 8-1: Remove the blind plugs

3 Unscrew connection (B) with a suitable wrench (A).

4 Pull the blind plugs (C) out of the connection.

5 Scre

w glandes not required must be r

eplaced by explosion-

proof screw connections.

Recommendation: store the blind plugs for the future or fo

returning to RMG for service work.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 79

8 Installation

Danger

For NEC 500 In countries where CSA / FM guidelines apply, the connec-

tions not required must be provided with gask factory. Please leave these in the screw connection and only connect the cable that leaves the conduit seal. When joining the conduits to the flame block, ensure for a slight gradient away from the flame block in order to avoid the accumulation of water on the conduit seal. Moreover, also ensure that you do not twist the conduit seal when securing the conduit as the cable in the electrics housing may tear-off as a result. If necessary, use a respective bolted connection (union).

et screws ex-

8.2

8.2.1

For all devices 6 Secure the device with r

 Chapter 6.2, „Ensure for a safe position of the device“ on

page 56

7 Check the device for any signs of damage.

 Chapter 6.3.2, „Checking the device for any signs of dam-

age“ on page 63

8 Clean the sealing surface of the flange from c

with a gentle cle

aning agent.

etainin

Installation of the device

Mounting the inlet and outlet piping

Escaping gas from incorrect seals

If flange seals are used for ultrasonic gas meters that protrude into the pipeline, potentially explosive gas mixtures may escape due to leaks. Risk of intoxication and explosion!

• Make sure that the flat seal does face into the pipeline.

not protrude over the sealing sur-

g bolts for the installation.

ontamination

Observe the instructions for the dimensions!

 Chapter 13.5,„Weights and dimensions“ on page 163

80 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

Notice

A Inlet piping B Ultrasonic gas meter C Outlet piping

Fig. 8-2: Installation of the Inlet and outlet piping

The bolted connection of Inlet (A) and outlet piping (C) must be tightened according to the tightening torque of the plant manufacturer. The tightening torque must comply with the bolts and seals used.

8.2.2

1 Clean

2 Tighten the bolts cross-wise in order to avoid tensioning.

In general, only the horizontal installation of the USM GT400 is strongly recommended. Turning the meter by more than 2 flange holes should not be used to avoid the collection of condensate in the sensor pockets. Only in dry and clean gas, other installation positions might be possible also, but it is not recommendable.

the sealing surface of the flang

with a gentle cleaning agent.

Installation of the connection box

The device can be ordered in different versions. Depending on the version ordered, another procedure must be carried out for the installation.

These are the order versions:

• conn

ection box according to ATEX / IECEx

 „Installatio

page 82

ection according to NEC 500

box must be installed here, only connect the cable accord-

ing to their designation.

 Cable

page 84

n of the connection box (ATEX / IECEx)“ on

connection „Connecting

e from contamination

the device electrically“ on

September, 4th 2018 Ultrasonic Flowmeter USM GT400 81

8 Installation

Installation of the connection box (ATEX / IECEx)

A Connection box Ex-de

Fig. 8-3: Connecting the connection box

This version of the connection box is supplied in countries where the ATEX / IECEx standards apply.

The external connecting housing is pre-assembled and connected electrically to the ultr

asonic electronics ex-factory.

82 Ultrasonic Flowmeter USM GT400 September, 4th 2018

 Open the connection box (Ex-de)

8 Installation

A Cover B Screws C Screwdriver

Fig. 8-4: Opening the connection box cover

1 Unscrew the screws (B) using a suitable screwdriver (C).

2 Remove cover (A).

 Closing the connection box (Ex-de)

1 Place cover (A) onto the connection box.

2 Screw in the sc

rews (B) using a suitable screwdriver (C).

Joining the device to the customers flameproof connection box

With this order version, no connection box is mounted on the device.

The device offers the connection by cable that are routed through

flame block. The wiring in the ultrasonic electronics is carried

the out ex-factory. The cables are marked accordingly for connecting and can be connected in a customer’s connection box.

Observe the following when installing:

• The

• Select a maximum cable length of three meters. If you need

September, 4th 2018 Ultrasonic Flowmeter USM GT400 83

cables must be connected according to t

to use longer cables, pleas

e contact RMG services.

he lettering.

8 Installation

8.3

Connecting the device electrically

In this chapter you will receive information on connecting the electrical connections.

The terminal strip for the electrical connection is located in the ex-

nal connection box. The terminal assignment and the

ter markin

gs of the cable are always identical.

Fig. 8-5: Connection assignment on the terminal strip

Maximum assignment The maximum assignment are always completely available for

the connections of the Ex-de connection box.

• Cur

rent / voltage supply (24 VDC)

• Warning message (Warn)

• Alarm message (Alarm)

• Pulse output for "Forwards mode" (

mode" (Pulse 2)

• 2 x dir

• Interface for RMGView

• Interface for an RMG flow comp

• Interface for any flow computer (RS 485 2)

• Anal

• Connection for a pressure sensor as a 2-wire 4-20mA

• Con

og output (4-20 mA)

(AU

1; Terminal 26: [P +] Terminal 27: [P -])

nection for a temperature sensor (PT100; AUX2; Terminal 28: [PT100 [PT100 -] Terminal 31: [PT100 -])

Pulse 1

ection detectors for bi-directional operation

USM

(RS 485 0)

uter (RS 485 1)

++], Terminal 29: [PT100 +

) and "Backwards

] Terminal 30:

(I/O1/2)

84 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

Cable specification The following cable specifications are according to a complete

assignment of the USM-GT-400 ATEX / IECEx version. The cable types listed are recomme technically comparable cable types.

ndations that can be replaced by

Power supply 24 VDC

Interface:  RS485-0, RS485-1, RS485-2

(can be layed in one cable)

AUX1 LIYCY 

AUX2 LIYCY 

Analog out: 4..20 mA LIYCY 

Warning + alarm LIYCY 

Pulse1 + pulse2 + I/ O1+ I/O2

ÖLFLEX® CLASSIC

3 x 1.5 mm² 3 x 2.5 mm

LIYCY (TP)

3 x 2 x 0.75 mm²

2 x 0.75 mm²

2 x 2 x 0.75 mm²

2 x 0.75 mm²

2 x 2 x 0.75 mm²

LIYCY (TP)  4 x 2 x 0.75 mm²

Cable 

12.3 mm

13.5 mm

9,4 mm



6.0 mm



8.5 mm



6.0 mm



8.5 mm



10.7 mm

Twisted pair cable (TP) are only required in case of multiple circuits in one cable. Otherwise, LIYCY 2 x 0.75 mm² is sufficient for all signal outputs.

September, 4th 2018 Ultrasonic Flowmeter USM GT400 85

8 Installation

Connection box according to ATEX / IECEx

A Ex-de for Europe

Fig. 8-6: Close the connection box

In those countries where the standards ATEX and IECEx are valid, the device is supplied

The external connection box is connected sonic electronics ex-factory and pr electronics. The external connection box does not have to be mounted.

with the connection box Ex-de (A).

electrically to the ultra-

e-assembled on the ultrasonic

Connection according to NEC 500

The number of lines that are permitted to be routed through the cable gland (½" and ¾") on the electrics housing and flame block is limited. Accordingly, this results in 4 different constellations that reflect the possibilities for connection.

The numbers given below at each figure o number of cables; all cables are labeled due to the number of the basic upper terminal block.

nly counts the limited

86 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

Version 1: Minimum assignment - ½" sealing fitting

Fig. 8-7: ½" cable gland with 11 wires, size AWG 18

1 ½" sealing fitting, connected with 11 wires, size AWG 18 (per-

mitted, max. 11; Killark Type ENY-1TM).

For this version, the ERZ 2000 or ERZ 2000 NG cannot connected via the DZU protocol (RS 485-1).

Version 2: Minimum assignment for bi-directional operation - ¾" sealing fitting

Fig. 8-8: ¾" cable gland with 20 wires, si ze AWG 18

2 ¾" sealing fitting, connected with 20 wires, size AWG 18

(permitted, max. 20; Killark Type ENY-2TM).

September, 4th 2018 Ultrasonic Flowmeter USM GT400 87

8 Installation

For bi-directional operation. For this version, the ERZ 2000 or ERZ 2000 NG cannot be con-

nected via the DZU protocol (RS 485-1).

Version 3: Minimum assignment for operation with pressure and temperature measurement - ¾" sealing fitting

Fig. 8-9: Measuring with pressure and temperature

For measuring with pressure and temperature: For this version, the ERZ 2000 or ERZ 2000 NG cannot be con-

nected via the DZU protocol (RS 485-1).

Version 4: Maximum assignment

1/2" and 3/4" sealing fitting

Fig. 8-10: ½“ and ¾“ sealing fittings with up to 31 wires of size AWG 18

88 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

3 Connect ¾" sealing fitting with 20 wires of size AWG 18 (per-

mitted, max. 20; Killark type ENY-2TM) and ½" cable gland with

11 wires of size AWG 18 (permitted, max. 11; Killark type

ENY-1TM).  All connections are routed to th nected and used.

Not used cables need to be isolated or connected to any unused free terminals.

e outside

and can be con-

8.3.1

A Power supply

Connecting the power supply

Fig. 8-11: Connection assignment on the terminal strip

1 Connect the power supply to the terminals 24 VDC (A).

 Figure 8-16 on page 94

September, 4th 2018 Ultrasonic Flowmeter USM GT400 89

8 Installation

Notice

8.3.2

Fig. 8-12: Dgital interfaces RS485-0 (A), RS 485-1 (B) and RS 485 -2 (C)

Digital interfaces of USM-GT400

The interfaces RS 485-0, RS 485-1 and RS 485-2 are basically equal and can be set for all possible connections. However, there are minor differences. These are taken into account in the recommended connections and make it recommended devices or the PC if they are followed.

ier to connect the

eas

Please use the connections as recommended below.  If connections are used differently additional, extensive settings may become necessary.

Recommended connections at the digital outputs.

RS 485-1 RS 485-2

IGM-protocol, DZU-protocol

ERZ2000, ERZ2400,

Instanz-F,

ERZ ..., 

Flowcomputer other suppliers

protocol, device

RS 485-0

RMGView (service)

USM

ERZ2000-NG, ERZ2000-DI

features

no parameterizable byte sequence for data types Long and Float

Modbus-Master, can handle IGM- and DZU-protocol, too, parameterizable byte sequence for data types Long and Float

90 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

8.3.3

A Service connection

Connecting the computer for RMGView

USM

Fig. 8-13: Connection assignment on the terminal strip

1 Connect the computer to the terminals RS 485-0 (A).

In order to connect, you need an interface converter from USB to RS

8.3.4).

485. (please see recommendations in chapter

September, 4th 2018 Ultrasonic Flowmeter USM GT400 91

8 Installation

8.3.4

Connecting the flow computer

A Ex-de according to ATEX und

IECEx

Fig. 8-14: Connection box types

The flow computer is connected to the terminal strip of the external connection box (A).

1 Ope

 Conne

Connection via data cable for ERZ 2000

Use the following cable:

• twisted pair and shielded cable

• maximum length 500 m / 1640

• line cross-section min. 2 × 2 × 0.75 mm

n the cover of the connection box.

 „Open the connection box (Ex-de)“ on page 83

cting the flow computer from RMG

92 Ultrasonic Flowmeter USM GT400 September, 4th 2018

8 Installation

A Connection Flow computer 1 B Connection Flow computer 1

Fig. 8-15: Connection assignment on the terminal strip

The 2 interfaces RS485-1 and RS485-2 have the same features and you may change in the following1 to 2 (and 2 to 1) freely.

1 Connect the first flow computer to the terminals

RS 485-1 (A).

2 Connect the second flow computer to t

RS 485-1 (B).

he terminals

September, 4th 2018 Ultrasonic Flowmeter USM GT400 93

8 Installation

 Connecting a flow computer from third-party manufac-

turers

A Connection Warning messages B Connection Warning messages C Connection Pulse 1 D Connection Pulse 2 E Connection RS 485-1 F Connection of S 485-2

Fig. 8-16: Connection assignment on the terminal strip

Flow computers from third-party manufacturers can be connected to RS 485-1 or RS 485-2 terminals. This interface comm

unicates via a Modbus protocol.

All diagnosis functions can be made available via a configuration

e Modbus.

of th

Flow computers from third-party manufacturers can also be connected to the terminals Pulse 1 and Pulse 2. When pa

rameterizing, take care that the maximum possible gas flow rate is assigned to a maximum frequency of 2 kHz. All diagnosis functions are not available.

1 Connect the flow computer to terminals RS 485-1 (E), RS

5-2 (F) or Pulse 1 (C) and 2 (D).

arning and alarm messages are also available. You also have to operation.

connect a direction contact for bi-directional

2 Connect the terminal Warn (A) fo

3 Connect the terminal Alarm (B) for alarm messages.

94 Ultrasonic Flowmeter USM GT400 September, 4th 2018

r warning messages.

8 Installation

Notice

8.3.5

Connection of external DSfG-Device-F via Modbus

Even though DSfG Device-F (DSfG Instanz-F) is a German standard the wish for a common connection for different ultrasonic gas flow rate meters may arise in other countries as well. Therefore this connection and its treatment is mentioned here, too.

The intension to connect Ultrasonic gas meters comparable to an electronic evaluations unit via the sam e proto col ari ses due to the wish to transfer "all" data determined by an ultrasonic gas meter, i. e. measured values as well as status information or diagnostic data. Therefore the connection via DSfG-device-F has become the standard in Germany.

Since the USM GT400 does not have its own DSfG bus access, its

DSfG-ins

computer, the ERZ 2000-NG, which has this access. To realize the access the necessary data are transferred between the  ERZ 2000-NG and USM GT400 via Modbus, ferred to as Instance-F, although it only provides the data required for DSfG

tance-F protocol is implemented externally via a flow

which is of

Instance-F.

ten re-

September, 4th 2018 Ultrasonic Flowmeter USM GT400 95

8 Installation

Fig. 8-17: Data exchange between ERZ 2000 NG and USM-GT-400

The corresponding settings can be found in the VK Modbus Master USM menu in the ERZ2000-NG. The corresponding register expressions can be found in the VJ register expressions menu. In the USM GT400, the Modbus registers of instance F are listed in column BA.

Electrical connection

The following figure shows the rear panel of the ERZ2000-NG. The USM GT400 is connected to the serial interface COM6.

96 Ultrasonic Flowmeter USM GT400 September, 4th 2018

RMG USM GT400 Operating Instruction

Specifications and Main Features

Frequently Asked Questions

User Manual

1 About this manual

Objective of the manual

Specialized knowledge required

Abbreviations

Symbols

Validity of the manual

2 Brief instructions

Mechanical connection

Connection flanges

Inlet / outlet piping

Joining pressure connections

Electrical connection

Start Up

Earthing

Parameter setting

3 Device overview

Main components

Ultrasonic electronics

Display screen

Buttons

Reset button

Switches

Light emitting diodes

4 Functional principle - Ultrasonic flow measurement

General description

Quality of installation

Turbulence

Profile and symmetry factor

Meter performance

Correction of the base line

Correction of the baseline for the velocity

Base line correction via polynomial

Correction via a piecewise linearization

Diagnostic function Speed of Sound

Standard method of SoS calculation

SoS calculation via gas components

Diagnostic function SoS

Extended SoS calculation

TW setting

Import of gas composition data

Option 4: Data input on fixed defaults

Option 4: Data input on fixed defaults for air

Terminal connections

Data input via RMGBus

Data via Modbus (USM-GT-400 is SLAVE)

Import of data via Modbus (USM-GT-400 is Master)

Treatment of the gas data

Status code of AGA 10 calculation

Batch mode

5 Safety

Intended use

Layout of instructions

Qualification of the personnel

Safety instructions

Hazards during transporting

Hazards during installation

Hazards during start up

Hazards during cleaning

Hazards during maintenance and repairs

Hazards during operation

Responsibilities of the operator

6 Transport and storage

Transport

Scope of supply

Transporting the device

Unpacking the device

Disposal of packaging material

Prior to installation

Removing the transporting locks

Packing the device for transportation

Storage

Packing the device for storage

Checking the device after storage

7 Construction and Planning

Connection flanges

Seals