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Installation & Configuration Manual
P/N MMI-20018786, Rev. AB
December 2011
Micro Motion 7835/45/47
Liquid Density Meters
Standard and Advanced Electronics
©2011, Micro Motion, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. Micro
Motion, ELITE, ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Process Management family of
companies. All other marks are property of their respective owners.
Micro Motion 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
Micro Motion cannot be held responsible for any errors, omissions, or other misinformation contained herein. No part of this
document may be photocopied or reproduced without prior written consent of Micro Motion.
Installation & Configuration Manual i
Contents
Chapter 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Safety guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.4 Electronics product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.5 Advanced electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5.1 Baseboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5.2 Option board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5.3 Remote display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 2004/22/EC (MID) applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 2 Installation Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 General information applicable to the complete system . . . . . . . . . . . . . . 7
2.2.2 Pressure bearing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Installation planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Meter mounting and pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.6 Calculation of pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.7 Special considerations for hygienic applications (7847 meter only) . . . . . . . . . . . . . 14
2.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier . . . . . . . . . . . . 14
2.9 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.10 Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3 Electrical Connections (Standard). . . . . . . . . . . . . . . . . . . . . . . . . 21
3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2 MID (2004/22/EC) Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.3 Ground connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.4 Use with Micro Motion signal converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.4.1 System Connections (Hazardous Area only) . . . . . . . . . . . . . . . . . . . . . . 22
3.4.2 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5 Use with customer’s own equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.5.1 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.5.2 System Connections (Hazardous Area only) . . . . . . . . . . . . . . . . . . . . . . 25
3.6 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 4 Electrical Connections (Advanced) . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2 MID (2004/22/EC) Requirements (7835/7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3 Planning an Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.4 Electrical installation in safe areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
ii Micro Motion 7835/45/47 Liquid Density Meters
Contents
4.4.1 Electrical Installation with Signal Converter . . . . . . . . . . . . . . . . . . . . . . 31
4.5 Electrical installation in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5.1 Safety Barrier and Galvanic Isolator Selection . . . . . . . . . . . . . . . . . . . . 32
4.5.2 Electrical connections in a hazardous area . . . . . . . . . . . . . . . . . . . . . . . 34
4.6 Baseboard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.7 Baseboard plus HART® Option Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.7.1 Electrical Installation for HART® Communications . . . . . . . . . . . . . . . . . 40
4.8 Advanced Density Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Chapter 5 Electrical Connections (Entrained Gas Option) . . . . . . . . . . . . . . . . 43
5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.2 Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3 Use with Signal Converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.1 System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.4 Use with Customer’s Own Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.4.1 System Connections for Safe Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.5 Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 6 Calibration and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.1.1 For Standard Electronics Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.1.2 For Advanced Electronics Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.2 Interpretation of calibration certificate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.2.1 General density equation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.2.2 Temperature correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.2.3 Pressure correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.2.4 Velocity of sound correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.3 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.3.1 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.3.2 Calibration of transfer standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.3.3 Instrument calibration certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.3.4 Pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.3.5 Insulation test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.3.6 Calibration check methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.4 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Chapter 7 Remote Display and Digital Communications. . . . . . . . . . . . . . . . . 59
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.2 Mechanical Installation of the 7965 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . 59
7.3 Safe Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.4 Hazardous Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.5 Configuring the Baseboard using the Remote Display . . . . . . . . . . . . . . . . . . . . . . . 61
7.5.1 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.5.2 Slave address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.5.3 Demo mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.5.4 Navigating the menu structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.5.5 Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.6 Multi-drop installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
7.7 Electrical installation of Computer Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
7.7.1 Connections using an RS-232/485 Converter . . . . . . . . . . . . . . . . . . . . . 67
Installation & Configuration Manual iii
Contents
Chapter 8 Using ADView and ProLink II . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1 Using ADView Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1.1 What is ADView? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1.2 Installing ADView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1.3 Starting ADView. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.1.4 Understanding ADView Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.2 Using ProLink II Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.2.2 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.2.3 Connecting from a PC to a transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.2.4 ProLink II configuration upload/download . . . . . . . . . . . . . . . . . . . . . . . . 79
8.2.5 ProLink II language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Chapter 9 General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.2 Fault analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.3 General maintenance procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.4 Physical checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.4.1 Check calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
9.4.2 Remedial servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Appendix A 7835 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.1 Density performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
A.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
A.5 OIML R117-1 classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
A.6 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
A.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
A.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
A.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
A.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Appendix B 7845/7847 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
B.1 Density performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
B.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
B.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
B.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
B.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
B.5 OIML R117-1 classifications (7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
B.6 General classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.6.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
B.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Appendix C Electronics Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.1 Standard Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
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C.1.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.1.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.2 Standard Entrained Gas Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.2.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.2.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.3 Advanced Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.3.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.3.2 Analog Output (including HART
®
Output) . . . . . . . . . . . . . . . . . . . . . . . . 94
C.3.3 Tube Frequency/Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
C.3.4 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
C.3.5 Time Period Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
C.3.6 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
C.4 Environmental Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
C.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
C.4.2 IP rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Appendix D Calculations and Configurable Factors
(Advanced Electronics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
D.1 Baseboard configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
D.2 Baseboard diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
D.3 Meter calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
D.3.1 Base density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
D.3.2 Special function calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
D.3.3 Quartic equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Appendix E Calibration Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
E.1 Example calibration certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Appendix F Modbus Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
F.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
F.2 Outline of the Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
F.3 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
F.4 Modbus dialect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
F.4.1 Register size and content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
F.5 Establishing Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
F.6 Modbus commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
F.7 Modbus register assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
F.8 Index and enumeration codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
F.8.1 Meter type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
F.8.2 Density, temperature, and pressure units . . . . . . . . . . . . . . . . . . . . . . . 122
F.8.3 Special function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
F.8.4 Special function quartic equation name codes . . . . . . . . . . . . . . . . . . . 123
F.8.5 Special function quartic equation units codes . . . . . . . . . . . . . . . . . . . . 123
F.8.6 Averaging time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
F.8.7 Analog output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
F.8.8 User-defined alarm variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
F.8.9 Normal alarm states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
F.8.10 Alarm coverage codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
F.8.11 Alarm hysteresis codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
F.8.12 Software version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
F.8.13 Status register flags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Installation & Configuration Manual v
Contents
Appendix G HART
®
Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
G.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
G.2 HART® basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
G.2.1 Physical form of transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.2.2 Transaction protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.2.3 Message structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.2.4 Data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.2.5 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.3 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.3.1 HART® conformance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
G.4 HART® Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
G.4.1 Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
G.4.2 Common Practice Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
G.5 Transmitter specific command structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
G.5.1 Command 128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
G.5.2 Command 129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
G.5.3 Table 1 - Identification codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
G.5.4 Table 2 - Limits and constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
G.5.5 Table 3 - Output / transmitter variable designations . . . . . . . . . . . . . . 134
G.5.6 Table 4 - Transmitter variable designations . . . . . . . . . . . . . . . . . . . . . 134
G.6 Summary of HART® functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Appendix H Certified System Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
H.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Appendix I Return Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
I.1 General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
I.2 New and unused equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
I.3 Used equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
vi Micro Motion 7835/45/47 Liquid Density Meters
Contents
Installation & Configuration Manual 1
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
Chapter 1
Introduction
1.1 Safety guidelines
Handle the 7835/45/47 liquid density meter with great care.
• Do not drop the meter or subject it to severe mechanical shock.
• Do not expose the meter to excessive vibration.
• Ensure axial loading from pipework does not exceed 1/2 tonne.
• Ensure all electrical safety requirements are applied.
• Ensure the meter and associated pipework have been pressure tested to 1-1/2 times the
maximum operating pressure.
• Do not use liquids incompatible with the construction.
• Do not operate the meter above its rated pressure.
• Do not expose the meter to excessive vibration (> 0.5 g continuous).
• Ensure meter is not transported when it contains hazardous substances. This includes fluids
that may have leaked into, and are still contained, within the case.
• To return a meter, refer to Appendix I for more information on the Micro Motion return policy.
Safety messages are provided throughout this manual to protect personnel and equipment. Read each
safety message carefully before proceeding to the next step.
1.2 Product overview
All of the products consist of a mechanical meter and an electronics unit that is normally mounted
inside the meter electronics housing. Together, the electronics and meter provide a system for
continuous on-line measurement of liquid density and temperature.
In applications where the pipeline temperature could exceed 110 °C (230 °F), the electronics should
be mounted in a Remote Amplifier Box (see Chapter 3 and Chapter 4 for more details.)
2 Micro Motion 7835/45/47 Liquid Density Meters
Introduction
Figure 1-1. 7835/45/47 liquid density meter
Liquid density is determined from the resonant frequency of a vibrating tube containing the liquid,
and liquid temperature is determined from a 100-Ω RTD.
1.3 Product range
The meters are identical mechanically, except for the material used in the wetted parts and the
flanges/couplings. A fully welded design is utilized to ensure maximum reliability in the most severe
environments. A rupture disc is embodied in the meter end plate furthest from the amplifier housing.
This disc will rupture if a pressure build-up occurs within the case, in the unlikely event of a tube
assembly leak; the operation of the rupture disc is shown in Figure 2-2.
1.4 Electronics product range
The meters described above may be operated with any of the following electronics options. However,
the electronics options are not all directly interchangeable; this is because the Advanced electronics
boards are physically longer than the Standard electronics boards, and so only fit in the extended
electronics enclosures provided with an Advanced meter.
It should be noted that the Standard Entrained Gas Electronics are NOT suitable for operation in
hazardous areas, whereas all of the other electronics boards are suitable.
For further details of the performance of the different electronics boards, please refer to the
appropriate chapters.
Table 1-1. Meter product range
Meter Tube material Features
7835 NI-SPAN-C
®
Low temperature coefficient and long term stability, appropriate for fiscal
applications.
7845 316L Stainless
steel
Good resistance to corrosion.
7847 316L Stainless
steel
Designed for the hygiene requirements of the food processing industry and has
3A authorisation. Please refer to Section 2.7 for special cleaning and installation
requirements in hygienic applications.
Electronics Enclosure
Meter
transducers
Installation & Configuration Manual 3
Introduction
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
1.5 Advanced electronics
In contrast to a meter fitted with Standard electronics (which requires a Signal Converter for
operation), the meter with Advanced electronics will provide a complete measurement system.
An Advanced baseboard, plus meter, provides a complete system for measuring liquid density and
liquid temperature. A Remote Display or one of the optional boards may be required if outputs need
to be configured in the field or if additional functionality is required.
Table 1-2. Electronics product range
Standard Electronics
Density version
Basic amplifier circuit providing a frequency signal (indicating
liquid density) and RTD resistance (indicating liquid temperature).
Interfaces with a Signal Converter.
Entrained gas
version
Similar amplifier circuit to the above but meter operating at a lower
frequency which is more insensitive to entrained gas. It is NOT
suitable for operation in hazardous areas.
Advanced Electronics
Density version
Entrained gas
version
Microprocessor controlled circuit with a choice of analog and
digital outputs providing a direct measurement of density and
temperature. Also providing a selection of calculated parameters
and several diagnostic functions.
As above but meter operating at a lower frequency more
appropriate for liquids with entrained gas. Suitable for operation in
hazardous areas.
Remote Amplifier Box
Advanced
Electronics
Suitable for operation in hazardous areas.
784521A: IIB Approval (ATEX)
784522A: IIC Approval (ATEX)
784523A: CSA Approval
784524A: Non-classified (supplied as spare for customer
installation).
Note that the advanced electronics amplifier cannot be fitted into
the Standard electronics Remote Amplifier Box.
4 Micro Motion 7835/45/47 Liquid Density Meters
Introduction
Figure 1-2. Advanced electronics baseboard and remote display
For convenience, the Advanced system design and performance are outlined below.
1.5.1 Baseboard
The baseboard can be considered the heart of the system. Along with a liquid density meter, it
provides a complete system for measuring liquid density and liquid temperature. The baseboard
performs a range of useful calculations and provides the following outputs:
• Two fully configurable 4–20 mA outputs.
• One pulse output providing either an alarm status signal or the meter tube frequency.
• An RS-485 digital communications link using RTU Modbus protocol.
1.5.2 Option board
The option board fits directly onto the baseboard. One option board is presently available.
• HART
®
board – providing an additional 4–20 mA output and full HART communications.
Only one board may be fitted at a time.
1.5.3 Remote display
The 7965 remote display is intended for either handheld or wall-mounted use. It provides a
convenient means for displaying calculated data and for configuring or analyzing the system setup. It
communicates via the baseboard RS-485 digital communications link. One remote display can
communicate with a number of meters if they are connected together on the same RS-485 link.
1.6 2004/22/EC (MID) applications
Mobrey Limited, a division of Emerson Process Management, has evaluated the 7835 and 7845 liquid
density meters against OIML R117-1:2007 and WELMEC guide 8.8 for use in measuring systems for
the continuous and dynamic measurement of quantities of liquids other than water. This evaluation
was in compliance with the European Measuring Instrument directive (2004/22/EC) annex MI-005.
Baseboard
Option board
Remote Display
7965 DISPLAY
Installation & Configuration Manual 5
Introduction
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
You may use the evaluation certificate for the 7835 and 7845 liquid density meters, with written
permission of Mobrey Limited to assist in obtaining an EC-type examination certificate for the
complete measuring system.
6 Micro Motion 7835/45/47 Liquid Density Meters
Introduction
Installation & Configuration Manual 7
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
Chapter 2
Installation Procedure
2.1 General
This chapter describes the mechanical installation of the 7835/45/47 liquid density meter.
2.2 Safety Information
2.2.1 General information applicable to the complete system
• These safety instructions are to be used whenever handling or operating this product. Suitably
trained personnel shall carry out the installation both mechanical and electrical in accordance
with the applicable local and national regulations and codes of practice for each discipline.
• Safe working practices for the media and process concerned must be followed during the
installation and maintenance of the equipment. Depressurize and isolate the system before
starting to loosen or remove any connection.
• If the equipment is likely to come into contact with aggressive substances, it is the
responsibility of the user to take suitable precautions that prevent it from being adversely
affected.
• It is the responsibility of the installer/user of this equipment to ensure:
• This product is not used as a support for other equipment or personnel.
• This product is protected from impact.
• It is important that this sensor is handled with care due to its weight and sensitivity to impact;
ensure lifting straps are fitted around flanged ends.
8 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
2.2.2 Pressure bearing parts
• It is the responsibility of the installer/user of this equipment to ensure:
• The materials of construction are suitable for the application.
• All piping connections conform to the local and national regulations and codes of practice.
• The pressure and temperature limits for this equipment are not exceeded, if necessary by
the use of suitable safety accessories. See Table 2-1.
• Correct gaskets/seals are fitted and are compatible with the media and process.
• The installed sensor is adequately supported for weight and vibration effects.
• Personnel are protected from hot burns by guards, thermal lagging or limited access.
Allow time to cool prior to carrying out maintenance operations. It is recommended that
“HOT” notices are fitted in the vicinity of the equipment where applicable.
• Regular inspection for corrosion and wear are carried out, both internal and external.
• The sensor must not be fitted until all installation work and final pre commissioning checks are
carried out. Do not remove blanking plugs until the sensor is fitted.
• The sensor must be installed in compliance with this manual, to ensure correct fitting. This
applies to all variants.
• The user should not repair this equipment, but general maintenance can be applied as
described within this manual.
Table 2-1 Pressure ratings: 316/316L dual-rated stainless steel
Process
Flange fitting
Pressure Rating
20°C 110°C
Class 600 1440.2 psi (99.3 bar) 1203.8 psi (83.0 bar)
Class 900 2159.6 psi (148.9 bar) 1805.7 psi (124.5 bar)
PN40 580.2 psi (40.0 bar) 539.5 psi (37.2 bar)
PN100 1450.4 psi (100.0 bar) 1348.9 psi (93.0 bar)
Installation & Configuration Manual 9
Installation Procedure
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
2.3 Installation planning
When planning the installation of a meter, it is important to consider the following factors:
2.4 Meter mounting and pipework
This section considers in more detail the mounting of the meters and the design of the associated
pipework, including the calculation of pressure drop in the meter.
The preferred methods of supporting the meter are shown in Figure 2-1.
Table 2-2. Installation considerations
Safety
When installing in a process line, it is important that the construction material of the wetted
parts (tube) is matched to the non-corrosive performance of the liquid passing through the
instrument. Failure to observe this requirement can cause deterioration of the central tube
(the bellows) and loss in measurement accuracy, or even a failure if leaking occurs. For
advice on which meter in the range is appropriate, please contact Micro Motion.
The NI-SPAN-C material of the central tube is not rated for ‘sour’ service as defined in
NACE specification MR0103-2005. For advice in this application, please contact
Micro Motion.
Serviceability
Installing the meter in a by-pass configuration allows it to be removed for servicing or
calibration without affecting the main pipeline. Possible by-pass configurations are shown in
Figure 2-3.
Performance
Pipe stresses and
vibration
Axial load should not exceed ½ tonne, so pipe-work should have a degree of flexibility.
Excessive pipe vibration should be avoided. Figure 2-2 for preferable mounting positions.
Gas bubbles The presence of gas bubbles can seriously affect the meter performance and so the
following points should be considered:
• The liquid must always be at a pressure substantially above its vapor pressure.
• All pipe-work couplings and joints must be airtight.
• No vortex should be present at the inlet to the meter.
• Cavitations, caused by pumping, should not generate bubbles from dissolved gases.
• If a pump is used it should ‘push’ rather than ‘pull’ the product through the meter.
Meter orientation • For low flow rates, for example 750 liters/hour (2.7 gal/min.), the meter should preferably
be mounted vertically or at an incline, with the flow in an upwards direction.
• If the liquid contains solid particles, the direction of flow should be upwards unless the
particles are large enough not to be carried with the flow, in which case the direction of
flow should be reversed.
• The meter should be mounted with the electric cable running downwards thereby
minimizing the ingress of water should a cable gland become defective.
Flow rate A fast flow rate, for example 3000 liters/hour (11 gal/min.), will help to achieve good
temperature equilibrium and have a self-cleaning action.
A low flow rate, for example 1000 liters/hour (3.7 gal/min.), is recommended if the product
contains particles which may cause erosion.
The meters exhibit a small flow dependent density reading. For flow rates up to 15000
liters/hour (55 gal/min) and assuming no consequent line pressure or product changes, the
maximum density offset will be less than 0.2 kg/m
3
.
Temperature stability Thermally lag the meter and the inlet and slipstream/bypass-loop pipework to ensure good
temperature stabilisation.
10 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
Figure 2-1 Preferred methods of mounting meters (support)
For continuously high flow rates, the mounting position can be selected to simplify the associated
pipework and help minimize the pressure and temperature losses (see Figure 2-2).
1st
Meter supported
in two positions around
1” schedule 80 pipe.
Meter supported
in two positions around
outer case (4” diameter).
3rd
Meter supported
in two positions around
the immediate pipework.
2nd
Installation & Configuration Manual 11
Installation Procedure
Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction
Figure 2-2 Preferred methods of mounting meter (angles)
1st
FLOW
90
o
Rupture plate blow out
Electric Cable
Direction of flow should
be reversed for slurries.
2nd
>60
o
Rupture plate blow out
Electric Cable
Direction of flow should
be reversed for slurries.
FLOW
Flow rate should be kept high
to prevent gas bubbles & sediment
from forming on the resonant tube.
3rd
Rupture plate blow out
Electric Cable
FLOW
12 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
Figure 2-3 Typical bypass pipeline configurations
‘S’ Bend Method
Pressure Bend Method
Pitot Tube Method
Laminar Flow Method
Orifice Plate Method
Direction of Flow
Pump Method
PUMP
PUMP
Integral Cleaning System
CLEANING LIQUID
/
