Solartron Mobrey 7828 Manuel utilisateur
Precision measurement solutions
7828
Density Transmitter
TECHNICAL MANUAL
78285000
Copyright © 2001
Solartron Mobrey Ltd.
All Rights Reserved
Solartron-Mobrey pursues a policy of continuous development and product improvement. The
specification in this document may therefore be changed without notice.
To the best of our knowledge, the information contained in this document is accurate and Solartron-
Mobrey cannot be held responsible for any errors, omissions or other misinformation contained herein.
No part of this document may be photocopied or reproduced without the prior written consent of
Solartron-Mobrey.
7828 Density Transmitter Technical Manual
78285000_AB iii
IMPORTANT
HANDLE THE 7828 WITH CARE
DO NOT drop the transmitter.
DO NOT use liquids incompatible with materials of
construction.
DO NOT operate the 7828 above its rated pressure.
DO NOT pressure test beyond the specified Test pressure.
ENSURE all explosion proof requirements are applied
ENSURE transmitter and associated pipework are pressure
tested to 1½ times the maximum operating pressure
after installation.
ALWAYS store and transport the 7828 in its original
packaging.
7828 Density Transmitter Technical Manual
iv 78285000_AB
7828 Density Transmitter Technical Manual Contents
78285000_AB v
Contents
SECTION 1 - INTRODUCTION
1.1 ABOUT THE 7828 DENSITY TRANSMITTER.................................... 1-1
1.1.1 What is it?..........................................................................................1-1
1.1.2 7828 measurements..........................................................................1-2
1.1.3 What is it used for?............................................................................1-2
1.1.4 Typical 7828 application....................................................................1-3
1.2 7828 OPTIONS...................................................................................1-4
SECTION 2 - MECHANICAL INSTALLATION
2.1 INTRODUCTION................................................................................2-1
2.2 BOUNDARY AND VISCOSITY EFFECTS.......................................... 2-3
2.2.1 Boundary effects................................................................................2-3
2.2.2 Viscosity effects.................................................................................2-6
2.3 STANDARD INSTALLATIONS...........................................................2-7
2.3.1 7828 orientation.................................................................................2-8
2.3.2 Free stream installation - flanged fitting.............................................2-9
2.3.3 Free stream installation - weldolet...................................................2-10
2.3.4 T-piece installation...........................................................................2-11
2.3.5 T-piece weldolet installation.............................................................2-12
2.3.6 Flow-through chamber installation...................................................2-13
2.4 INSTALLATION INTHE PIPELINE OR SYSTEM............................ 2-14
2.4.1 Fluid at the sensor...........................................................................2-14
2.4.2 Thermal effects................................................................................2-14
2.4.3 Flow rate..........................................................................................2-15
2.4.4 Entrained gas...................................................................................2-15
2.4.5 Solids contamination........................................................................2-15
2.4.6 Example installation.........................................................................2-15
2.5 COMMISSIONING............................................................................ 2-16
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vi 78285000_AB
SECTION 3 - ELECTRICAL INSTALLATION
3.1 INTRODUCTION.................................................................................3-1
3.2 INSTALLATION CONSIDERATIONS.................................................3-2
3.2.1 Power supply .....................................................................................3-2
3.2.2 EMC...................................................................................................3-2
3.2.3 Ground connections...........................................................................3-2
3.2.4 Cabling...............................................................................................3-2
3.2.5 Surge protection.................................................................................3-3
3.3 WIRING THE 7828..............................................................................3-4
3.3.1 Wiring Procedure...............................................................................3-5
3.4 CONNECTIONS..................................................................................3-7
3.4.1 Power.................................................................................................3-7
3.4.2 RS485................................................................................................3-7
3.4.3 RS485 to RS232................................................................................3-8
3.4.4 RS485 Multidrop..............................................................................3-11
3.4.5 Transmission mode .........................................................................3-11
3.4.6 Analog 4-20mA output.....................................................................3-11
3.5 INSTALLATION INEXPLOSIVE AREAS..........................................3-12
SECTION 4 - USING ADVIEW
4.1 WHAT IS ADVIEW?............................................................................4-1
4.2 INSTALLING ADVIEW........................................................................4-1
4.3 STARTING ADVIEW...........................................................................4-2
4.3.1 Setting up serial communications......................................................4-2
4.4 USING ADVIEW..................................................................................4-5
4.4.1 ADView facilities................................................................................4-5
4.4.2 Menu bar............................................................................................4-6
4.4.3 Configuring a slave address..............................................................4-6
4.4.4 Board configuration............................................................................4-7
4.4.5 Data logging.....................................................................................4-10
4.4.6 Register Dump/load.........................................................................4-11
4.4.7 Register Read/write.........................................................................4-12
7828 Density Transmitter Technical Manual Contents
78285000_AB vii
SECTION 5 - CALIBRATION CHECK
5.1 CALIBRATION................................................................................... 5-1
5.1.1 Factory calibration .............................................................................5-1
5.1.2 Calibration of transfer standards .......................................................5-1
5.1.3 Instrument calibration ........................................................................5-1
5.1.4 General density equation...................................................................5-2
5.2 SAMPLE CALIBRATION CERTIFICATE............................................ 5-3
5.3 USER CALIBRATIONCHECKS.........................................................5-4
5.3.1 Ambient air calibration check.............................................................5-4
5.3.2 On-line calibration adjustment...........................................................5-4
SECTION 6 - MAINTENANCE
6.1 GENERAL..........................................................................................6-1
6.2 GENERAL MAINTENANCE ...............................................................6-2
6.2.1 Physical checks.................................................................................6-2
6.2.2 Electrical checks................................................................................6-2
6.2.3 Calibration check...............................................................................6-2
6.3 FAULT ANALYSIS AND REMEDIAL ACTION...................................6-3
6.3.1 Mechanical servicing .........................................................................6-3
6.3.2 Time Period Trap...............................................................................6-3
APPENDIX A - SPECIFICATION
A.1 GENERAL..........................................................................................A-1
A.2 SPECIFICATION................................................................................A-1
A.2.1 Sensor performance..........................................................................A-1
A.2.2 Environmental....................................................................................A-2
A.2.3 Transmitter power supply ..................................................................A-2
A.2.4 Analog output.....................................................................................A-2
A.2.5 RS485 Interface.................................................................................A-3
A.2.6 Approvals...........................................................................................A-3
A.3 FACTORY DEFAULTCONFIGURATION ..........................................A-4
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viii 78285000_AB
APPENDIX B - CALCULATED PARAMETERS
B.1 INTRODUCTION................................................................................B-1
B.2 BASE DENSITY REFERRAL.............................................................B-2
B.2.1 Matrix density referral....................................................................... B-2
B.2.2 API density referral........................................................................... B-3
B.3 CALCULATED PARAMETERS..........................................................B-6
B.3.1 Specific Gravity................................................................................. B-6
B.3.2 Degrees Baumé................................................................................ B-6
B.3.3 Degrees Brix..................................................................................... B-6
B.3.4 Quadratic Equation........................................................................... B-6
B.3.5 % Mass............................................................................................. B-7
B.3.6 % Volume ......................................................................................... B-7
B.3.7 API degrees...................................................................................... B-7
APPENDIX C - SAFETY CERTIFICATION
C.1 INTRODUCTION................................................................................C-1
APPENDIX D - MODBUS COMMUNICATIONS
D.1 INTRODUCTION................................................................................D-1
D.2 ACCESSING MODBUS REGISTERS................................................D-2
D.2.1 Establishing Modbus Communications.............................................D-2
D.3 MODBUS IMPLEMENTATION...........................................................D-3
D.3.1 Register size and content.................................................................D-3
D.4 MODBUS REGISTER ASSIGNMENTS .............................................D-4
D.5 INDEX CODES...................................................................................D-7
D.5.1 API product type...............................................................................D-7
D.5.2 Pressure, temperature, density and other units................................D-7
D.5.3 Special function.................................................................................D-8
D.5.4 Special function quadratic equation name........................................D-8
D.5.5 Special function quadratic equation units.........................................D-9
D.5.6 Output averaging time ......................................................................D-9
D.5.7 Analog output selection.....................................................................D-9
D.5.8 Referral temperature.......................................................................D-10
D.5.9 Alarm coverage............................................................................... D-10
D.5.10 Alarm hysteresis.............................................................................D-10
D.5.11 Software version.............................................................................D-10
D.5.12 Hardware type.................................................................................D-11
7828 Density Transmitter Technical Manual Contents
78285000_AB ix
D.5.13 User selected alarm variable.......................................................... D-11
D.5.14 Unit type.......................................................................................... D-11
D.5.15 Status Register flags....................................................................... D-12
D.6 ESTABLISHING MODBUS COMMUNICATIONS ............................D-13
D.7 EXAMPLE OF DIRECT MODBUS ACCESS....................................D-15
D.7.1 Example 1: Reading line density (16-bit register size).................... D-15
D.7.2 Example 2: Reading line density (32-bit register size).................... D-16
APPENDIX E - REFERENCE DATA
E.1 CONVERSION TABLES.....................................................................E-1
E.1.1 Length units.......................................................................................E-1
E.1.2 Mass units..........................................................................................E-1
E.1.3 Mass flow units..................................................................................E-1
E.1.4 Volume flow units...............................................................................E-2
E.1.5 Volume/capacity units........................................................................E-2
E.1.6 Temperature units .............................................................................E-2
E.1.7 Pressure units....................................................................................E-2
E.1.8 Density units......................................................................................E-3
E.1.9 Dynamic viscosity units......................................................................E-3
E.1.10 Kinematic viscosity units....................................................................E-3
E.2 PRODUCT DATA...............................................................................E-4
E.2.1 Density/temperature relationship of hydrocarbon products...............E-4
E.2.2 Platinum resistance law (to DIN 43 760)...........................................E-6
E.2.3 Density of ambient air (in kg/m3)........................................................E-6
E.2.4 Density of water (in kg/m3to ITS-90 temperature scale)...................E-6
APPENDIX F - COSSH FORM
7828 Density Transmitter Technical Manual
x78285000_AB
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