Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Manuals & Guides

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.

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

Installation & Configuration Manual i

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

ii Micro Motion 7835/45/47 Liquid Density Meters

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

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

Output) . . . . . . . . . . . . . . . . . . . . . . . . 94

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

iv Micro Motion 7835/45/47 Liquid Density Meters

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

Installation & Configuration Manual v

Contents

vi Micro Motion 7835/45/47 Liquid Density Meters

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.)

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 1

Introduction

Electronics Enclosure

Meter

transducers

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.

Table 1-1. Meter product range

Meter Tube material Features

7835 NI-SPAN-C

7845 316L Stainless

steel

7847 316L Stainless

steel

Low temperature coefficient and long term stability, appropriate for fiscal applications.

Good resistance to corrosion.

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.

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.

2 Micro Motion 7835/45/47 Liquid Density Meters

Introduction

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

Advanced Electronics

Density version

Entrained gas version

Remote Amplifier Box

Advanced Electronics

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.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

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.

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.

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.

Installation & Configuration Manual 3

Introduction

Baseboard

Option board

Remote Display

7965 DISPLAY

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

4 Micro Motion 7835/45/47 Liquid Density Meters

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.

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.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 5

Introduction

6 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 2

Installation Procedure

2.1 General

This chapter describes the mechanical installation of the 7835/45/47 liquid density meter.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

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.

Installation & Configuration Manual 7

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.

Table 2-1 Pressure ratings: 316/316L dual-rated stainless steel

Process Flange fitting

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)

Pressure Rating

20°C 110°C

• 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.

8 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

2.3 Installation planning

When planning the installation of a meter, it is important to consider the following factors:

Table 2-2. Installation considerations

Safety

Serviceability

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.

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

Gas bubbles The presence of gas bubbles can seriously affect the meter performance and so the

Meter orientation • For low flow rates, for example 750 liters/hour (2.7 gal/min.), the meter should preferably

Flow rate A fast flow rate, for example 3000 liters/hour (11 gal/min.), will help to achieve good

Temperature stability Thermally lag the meter and the inlet and slipstream/bypass-loop pipework to ensure good

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.

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.

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.

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

temperature stabilisation.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

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.

Installation & Configuration Manual 9

Installation Procedure

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

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).

10 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

1st

FLOW

Rupture plate blow out

Electric Cable

Direction of flow should be reversed for slurries.

2nd

>60

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

Figure 2-2 Preferred methods of mounting meter (angles)

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 11

Installation Procedure

‘S’ Bend Method

Pressure Bend Method

Pitot Tube Method

Laminar Flow Method

Orifice Plate Method

Direction of Flow

Pump Method

PUMP

Integral Cleaning System

CLEANING LIQUID

Figure 2-3 Typical bypass pipeline configurations

12 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

200 f

×L×

×ρ×

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

2.5 Pressure drop in the meter

The pressure drop in the meter depends on:

• Flow rate (V), and

• Kinematic viscosity (

υ)

Table 2-3. Pressure drop at various flow rates

Flow Rate Flow Velocity Pressure Drop

(liters/hour) (V m/s)

1000 0.6 0.003 0.004

4000 2.5 0.033 0.048

12000 7.6 0.238 0.345

(1) Indicates laminar flow (fluid density 1.0 g/cc)

υ = 2 cS u = 10 cS

2.6 Calculation of pressure drop in the meter

The meter should be considered as a straight pipe of 23.6 mm (0.929”) internal diameter and 1.03 m (40.551”) in length. The following formula has been proven to apply to the meter by measurements at 12000 liters/hour (44 gal/min).

Where:

• h = Pressure drop (bars)

(1)

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

• f = Friction coefficient

• L = Pipe length (m) = 1.03 mm

• D = Internal pipe diameter (mm) = 23.6 mm

• V = Mean fluid velocity (m/s)

•

= Fluid density (g/cc)

• g = 9.81 (m/s

For viscous or laminar flow (Reynolds Number R

• Frictional Coefficient (f) = 16

)

less than 2000):

÷ R

For turbulent flow (Re greater than 2500):

• Frictional Coefficient (f) = 0.064

Where, pipe R

= 1000 x V x D ÷ υ [υ = kinematic viscosity (cS)]

÷ R

0.23

In addition to the pressure drop caused by the liquid flow through the instrument, it will be necessary to calculate the pressure drop in any associated sample pipework before concluding the system design requirements.

Installation & Configuration Manual 13

Installation Procedure

2.7 Special considerations for hygienic applications (7847 meter only)

The 7847 meter is specially designed for use in hygienic applications. The following points should be considered when planning an installation for a hygienic application.

Table 2-4. Considersations for hygienic applications

Meter orientation

Meter mounting

Steam cleaning

Electrical installation

Post installation

The 7847 shall be installed in the vertical plane to prevent the accumulation of product residue in the convolutions of the bellows, causing contamination, especially during the final rinse when cleaning. The installation shall include a means of draining the meter.

The method of mounting the meter shall comply with 3-A recommendations. Process seals suitable for the media and complying with 3-A recommendations shall be used.

Where it is necessary to sterilize the meter using the steam cleaning process, ensure the temperature and duration of cleaning does not exceed 250 °F (121 °C) for a period of 30 minutes. Exceeding this limit may permanently damage the meter’s amplifier circuit.

Cable glands and blanking plugs with a minimum rating of NEMA 4/IP66, shall be used to ensure the environmental rating of the enclosure is not reduced.

Ensure the cable glands, blanking plugs, lid, and seal are in place and tightened to prevent moisture and dust ingress.

2.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier

For operating in product temperatures greater than 230°F (110 °C), it is necessary to remove the amplifier unit from direct contact with the meter to a remote position. For this purpose, a flexible PTFE conduit with over-braiding of stainless steel mesh is introduced between the amplifier housing and the new amplifier housing. Three twisted pair cable looms are fed through the conduit to complete the extended meter/amplifier connections.

This high temperature arrangement allows the amplifier unit to be mounted in a more temperate environment and in no way impairs the operational accuracy of the meter. The maintenance and calibration procedures remain relevant to the re-configured meter assembly.

Figure 2-4 shows the installation for the 78452 version, which is for Advanced Electronics only.

14 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

Figure 2-4. 7845 with Advanced electronics remote amplifier unit installation

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 15

Installation Procedure

2.9 Post-installation checks

After installation, the meter should be pressure tested to 1.5 times the maximum working pressure of the system but not to a value exceeding the meter test figure shown on the meter label.

If the pressure test figure is exceeded, the meter may be irrevocably damaged.

16 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

2.10 Installation Drawings

Figure 2-5 Installation for the 7835/45/47 with Standard electronics

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 17

Installation Procedure

Figure 2-6 Installation drawing for the 7835/45/47 with Advanced electronics

18 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

Figure 2-7 Flanges used for the 7835/45/47 liquid density meters

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

Installation & Configuration Manual 19

Installation Procedure

20 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 3

Electrical Connections (Standard)

3.1 General

This chapter describes the electrical installation of the 7835/45/47 liquid density meters with Standard Electronics fitted. The units are identical, except where the 7845 and 7847 meters are to be used at temperatures above 110

3.2 MID (2004/22/EC) Requirements

To comply with the MID (2004/22/EC) directive:

• The digital communication (Modbus and HART) must be disconnected during operational use. It can only be used for commissioning and maintenance.

• Unused cable ports must be sealed with suitably rated blanking plugs.

• After commissioning or maintenance of the meter, you must seal the enclosure cover to secure legally relevant parameters from unauthorized modification.

See Section 3.2.1 for more information on securing the meter from unauthorized access to the meter controls.

°C (230 °F) when the remote amplifier version is recommended.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

3.2.1 Securing the meter for MID

To seal the meter from unauthorized access after commissioning or maintenance, Micro Motion has provided additional holes on the electronics housing cover to attach a locking wire to the transmitter cover. The securing component must bear the mark as laid down by the national inspection authority. Figure 3-1 illustrates the suggested method for sealing the meter.

Note: When installing the meter in a MID measuring system, you must consider the method in which the system will be verified to meet MID requirements. This method may impact the design of the measurement system, and we recommend you involve the national inspection authority early in the design process.

Installation & Configuration Manual 21

Electrical Connections (Standard)

Stainless steel locking wire (supplied by MID inspector)

Bonding crimp (supplied by MID inspector)

Use hole in screw(s) to attach locking wire

Figure 3-1 MID seal method

3.3 Ground connections

The earthing pads on the mounting face of the amplifier unit MUST make good contact with the meter case by the M3 cage nuts. The meter should be grounded via the pipework.

The external earth bonding point of the meter is located inside the maintaining amplifier housing.

The 0V power supply lead should be earthed at the supply end, or at the safety barriers if applicable.

3.4 Use with Micro Motion signal converters

3.4.1 System Connections (Hazardous Area only)

When the meter is used in a hazardous area, a safety barrier MUST be interposed between the meter and the signal processing equipment. (See Chapter 3 for information on selecting a safety barrier.)

• For installation of the CSA certified unit in a hazardous area, refer to Appendix H.

• For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety instructions booklet shipped with your unit (also available at www.micromotion.com).

3.4.2 System connections (Safe Area only)

The density system connections are illustrated in Figure 3-2.

22 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Standard)

Figure 3-2 Electric connection diagram to signal converters

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

3.5 Use with customer’s own equipment

3.5.1 System connections (Safe Area only)

• Power supply to density meter: 15.5 V to 33 V dc, 25 mA minimum

• Power supply to RTD: 5 mA maximum

The frequency at which the meter is operating can be detected by using a series resistor in the +VE power line. The value of resistance to be used for a given supply voltage must not exceed the value obtained from the LOAD NOMOGRAM (Figure 3-4). The electrical connections to be made are shown in Figure 3-3.

Installation & Configuration Manual 23

Electrical Connections (Standard)

7835/45/46/47 with

Standard Electronics

PRT

See Note

POWER +VE

SIGNAL +VE

POWER −VE

SIGNAL −VE

PRT SUPPLY +VE

PRT SIGNAL

PRT SUPPLY −VE

Figure 3.2 - Electrical Connection Diagram

7835/45/46/47 with Standard Electronics to Customer’s Own Equipment

POS +

NEG -

SIG

Note: See Load Nomogram (Figure 3.3) to determine R value.

1μF

Meter

RTD

Figure 3.3 Load Resistance Nomogram

Supply Voltage (volts d.c.)

(33)

Maximum Supply Voltage ‘E’

100

200

300

400 500 600

700

Loa

d R

Supply Voltage

Maximum Load Resistance

for Given Supply Voltage

Maximum Load Resistance (ohms)

Note: It is recommended that the actual load resistor should

be 50 ohms less than that given by the Nomogram.

Figure 3-3 Electrical connection diagram to customer’s own equipment

24 Micro Motion 7835/45/47 Liquid Density Meters

Figure 3-4 Load resistance

Electrical Connections (Standard)

3.5.2 System Connections (Hazardous Area only)

Installation of the meter, the safety barriers, and the customer's signal processing equipment is shown in Figure 4.4.

• For installation of the CSA certified unit in a hazardous area, refer to Appendix H.

• For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety instructions booklet shipped with your unit (also available at www.micromotion.com).

Note: Whenever there is disagreement between connection details on the figures dealing with Hazardous Areas and Certified System Diagrams, the Certified System Diagrams are the authoritative documents.

Figure 3-5 Electrical Connection Diagram with Standard Electronics to Customer’s Own Equipment

(Hazardous AREAS)

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

3.6 Post-installation checks

After installation, the following procedure will indicate to a high degree of confidence that the meter is operating correctly.

Measure the current consumption and the supply voltage at the meter amplifier. This should be within the limits:

• 15.5 to 33Vdc, 17mA ±1mA (Safe Areas)

• 15.5 to 21.5Vdc, 17mA ±1mA (Hazardous Areas)

With the meter empty, clean and dry, measure the periodic time of the output signal and check that it is as specified on the meter calibration certificate (air check), to within the limits given in the table below.

Installation & Configuration Manual 25

Electrical Connections (Standard)

Meter type Air check limit at 20°C Added temperature effect

7835 ±60 ns ±10 ns/°C 7845/47 ±60 ns –300 ns/°C

26 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 4

Base board

Option board

Remo te Display

7965 DISPLAY

Electrical Connections (Advanced)

4.1 General

This chapter describes the electrical installation of the 7835 and the 7845/7847 Liquid Density Meters when fitted with the Advanced electronics option.



The first sections of this chapter address the installation and configuration of the Advanced Baseboard, and the later sections concern the Advanced option boards. Further details about the

installation of the Remote Display are given in the Micro Motion 7835/45/47 liquid density meter Configuration and Use Manual.

4.2 MID (2004/22/EC) Requirements (7835/7845 Only)

To comply with the MID (2004/22/EC) directive:

• The digital communication (Modbus and HART) must be disconnected during operational use. It can only be used for commissioning and maintenance.

• Unused cable ports must be sealed with suitably rated blanking plugs.

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

• After commissioning or maintenance of the meter, you must seal the enclosure cover to secure legally relevant parameters from unauthorized modification.

See Section 4.2.1 for more information on securing the meter from unauthorized access to the meter controls.

Installation & Configuration Manual 27

Electrical Connections (Advanced)

Stainless steel locking wire (supplied by MID inspector)

Bonding crimp (supplied by MID inspector)

Use hole in screw(s) to attach locking wire

4.2.1 Securing the meter for MID

To seal the meter from unauthorized access after commissioning or maintenance, Micro Motion has provided additional holes on the electronics housing cover to attach a locking wire to the transmitter cover. The securing component must bear the mark as laid down by the national inspection authority. Figure 4-1 illustrates the suggested method for sealing the meter.

Figure 4-1 MID seal method

28 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

4.3 Planning an Electrical Installation

When planning the electrical installation of an Advanced unit, it is important to consider the points given below.

Safety

Power supply

Ground connections

Cable parameters

EMC

• Electrical installation in hazardous areas requires strict adherence to local codes of practice.

• For installation of the CSA certified unit in a hazardous area, refer to Appendix H.

• For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety instructions booklet (available at www.micromotion.com).

• The Advanced electronics operate from a nominal 24V supply, but will operate from any supply in the range 9.5V to 28V, measured at the supply terminals on the baseboard.

• The output circuits on the baseboard are all loop-powered and are isolated from the main circuit. If required, the main circuit and the output circuits can be powered from a common power supply.

• When selecting a suitable power supply voltage, you must take into account voltage drops caused by the connecting cable (see below) and in hazardous areas, across zener barriers or galvanic isolators.

• The earthing pads on the baseboard must make good contact with the meter case via the M3 bolts.

•If a HART® option board is used, the indicated earthing point must make good contact with the baseboard earthing points.

• The 0V power supply lead should be earthed at the supply end, or at the safety barriers if applicable.

• Where long cable lengths are required the cable resistance may be significant. When operating from a 24V supply in safe areas the following limits apply:

- Maximum line resistance (Ω)

- Power supply 260

- Remote Display 60

- Outputs 500

For further details relating to the maximum line resistance, please refer to Appendix D.

• When calculating the maximum cable lengths please note that the current loop is 2 times the cable length, and so the cable resistance is given by: 2 x (dc resistance per unit length) x (cable length).

• Typical cables would comply with BS5308 Type 1 or 2.

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the meter be connected using a suitable instrumentation cable. The instrumentation cable should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, the overall screen should be connected to earth at both ends (360° bonded at both ends). The inner individual screen(s) should be connected at only one end, the controller (e.g. signal converter) end.

• Note that for intrinsic safety, termination of the inner individual screen(s) to earth in the hazardous area is NOT generally permitted.

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable ports should be fitted with metal blanking plugs.

• When the 78452 (Advanced Remote Amplifier) is used, the ferrite ring, which is supplied, must be fitted around the connecting cable. For installation in hazardous areas, refer to the certified system drawings in Appendix H, and the safety instruction booklet that came with the meter (also available at www.micromotion.com) .

Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction Installation Procedure Electrical Connections (Advanced)Electrical Connections (Standard)Introduction

4.4 Electrical installation in safe

areas

All connections to the baseboard are made to terminals 1 to 12 of the terminal block PL2 as shown in Figure 4-2.

Installation & Configuration Manual 29

Electrical Connections (Advanced)

Ana lo g 1

Anal og 2

Alarm

22mA

2mA

Alar m

22m A

2mA

OPTIONAL

BOAR D

PL1

PL 2

P/U 1 P/U 2

PRT -

SIG SIG +

PRT +

DRIVE

PUL SE 1

ANA LO G 1

SUP P LY +

+ A B

DISPLAY

Eart hing Point

Ea r t h i ng Po i n t

ANA LO G 2

12 34 5

678910

12345

789

Jumper Links

Foam support strip

Figure 4-2 Baseboard Layout



30 Micro Motion 7835/45/47 Liquid Density Meters

Note: There is no reason to remove the baseboard under normal circumstances. If it is removed, however, care should be taken, when replacing the board, to push it firmly against the foam strip, as this helps to prevent the board from excessive flexing.

Figure 4-3 shows a schematic representation of the electrical connection diagram for the Advanced Baseboard and Remote Display in safe areas. In this example, the pulse output is shown driving an alarm device such as a relay.

Electrical Connections (Advanced)

Analog

Output

+16V to 28V

50 0 Ω MAX

Pulse

Cable Screen 1

0V Power 2

+v e Power 3

A 4 B 5

Remote

Display

Analog

Output

(as abo ve)

1 +

2 -

}

8 -

7 +

9.5V to 28V dc Power Supply

12 B

11 A

10 +

9 -

}

4 -

3 +

5 +

6 -

}

Remote

Display

An al og 1

Analog 2

Supply

+5V to 28V

Pulse

Output

Adv a nce d

Density

Baseboard

PL2 C onn ecti on s

Load

500Ω min imum

10 00 Ω typical

Figure 4-3 Connection Diagram (Safe areas)



Installation & Configuration Manual 31

4.4.1 Electrical Installation with Signal Converter

Figure 4-4 shows a typical electrical connection diagram for use in safe areas using signal converters.

Electrical Connections (Advanced)

1000Ω

+ Densit y Pwr

+ Density Input

- Density Pw r

- Density Input

+ Analog Input

SE E FL O W

COMPUTE R/

SIGNAL

CONVERTER

HANDB O OK

FOR

CONNECTION

DETAILS

(5)

(6)

+ Density Pwr

- Density Pwr

- Analog Input

+Density Pwr

- Density Pwr

Power Supp ly

Analog 1 (Analog 2)

Fre q/A larm

+VE

-VE

+VE

-V E

+VE

-VE

7835/45/47 with advanced electronics

7950/51

Figure 4-4 Electrical connection diagram when using a signal converter (Safe area)



4.5 Electrical installation in hazardous

When used in hazardous areas, safety barriers MUST be interposed between the meter and the signal processing equipment. Some of the safety barriers are unsuitable for certain installations, as discussed below.

4.5.1 Safety Barrier and Galvanic Isolator Selection

Power Supply (PL2 terminals 7 and 8)

As a general rule, the IIB safety barrier should be used where possible as this allows the maximum power to the meter, facilitating a wide range of installations and system configurations.

Where the installation requires the IIC safety barrier, it is important to check that sufficient power is available to power the meter and all of the options. The table below summarizes the maximum line resistances allowable for the main system configurations assuming a 24V supply and a minimum of

9.5V available at the supply terminals on the baseboard.

areas

• For installation of the CSA certified unit in a hazardous area, refer to Appendix H.

• For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety instructions booklet shipped with the unit (also available at www.micromotion.com).

32 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

()

1150

95.02.828

×−

Table 4-1 Maximum line resistances for main system configurations

Advanced System combination

Baseboard 340

Baseboard + remote display 260

Baseboard + locally powered remote display 280

Baseboard + HART

board 270

+ display 250

Zener Safety Barriers

Power to the main circuit may be obtained through a simple 164Ω barrier or two 300Ω 28V barriers in parallel for IIB applications, or through a single 234Ω 28V barrier in IIC applications.

The main characteristics of the safety barriers are given in Table 4-2. Using this information and the information given in Table 4-1, the most suitable barriers for a particular application can be ascertained.

Maximum line resistance (Ω) (barrier + cable)

Table 4-2 Safety barrier characteristics

Example Type Group Safety Description (Ω) Max. resistance (Ω)

MTL 729P IIB 164 184

MTL 728P IIC 234 253

P&F Z728H IIC 240 250

Note: The power supply input is protected internally by an 8.2V±5% clamp diode and a 1

resistor.

This limits the maximum current that can flow into the device:

max

Maximum voltage from barrier

Minimum resistance of barrier/input combination

- Minimum voltage at input

For example, if two 28V, 300Ω barriers are used in parallel, the effective resistance is 150Ω.

The maximum current is:

= = 134mA

max

…and not 185mA, as might be expected if the input protection diode was not present.

Galvanic Isolators

Galvanic isolators are suitable for powering the main board in IIB applications, but are NOT suitable for powering the main board in IIC applications. Also, IIC isolators are not suitable for use when Modbus communications are required.

The main characteristics of the galvanic isolators are given here. Using this information and the information given in the table above, the most suitable galvanic isolators for a particular application can be ascertained.

Installation & Configuration Manual 33

Electrical Connections (Advanced)

Table 4-3 Galvanic isolator characteristics

Example Type Group Max output impedance (Ω)

MTL 3022 IIB 165

P&F KFD2-SD-Ex1.36 IIB 160

P&F KFD2-SL-Ex1.36 IIB 160

MTL 5022 IIB 143

Analog (4 to 20mA) outputs including HART

(PL2 terminals 3 & 4, 5 & 6 and HART PL3 3 & 4)

Any of the zener safety barriers listed on the system certificates are suitable for operation with the Advanced Density analog outputs. Some galvanic isolators may not be capable of driving the 2mA and 22mA out-of-range alarm states available on the Advanced Density system; for details please check with the barrier supplier.

Pulse output

(PL2 terminals 1 & 2)

The pulse output can be configured to output either a status / alarm signal or the resonant frequency of the density meter; the latter requires the safety barrier to have a bandwidth of at least 1 kHz.

The table below indicates which galvanic isolators may be used for frequency-configured pulse output; zener barriers may be used for either configuration.

Table 4-4 Pulse output configurations

Example Type Output description Pulse output configuration

MTL3011 Relay Status / alarm

MTL3012 Solid state (dc to 2kHz) All

MTL4013 Solid state (dc to 5kHz) All

MTL4014 Relay Status / alarm

MTL5011 Relay Status / alarm

MTL5016 Relay Status / alarm

MTL5017 Relay Status / alarm

4.5.2 Electrical connections in a hazardous area

Table 4-5 Electrical connections in a hazardous area

Drawing Reference Description

Advanced Electronics, HART, MODBUS, and Zener Barrier (Gas Groups A, B, C and D)

Advanced Electronics, HART, MODBUS, Remote Display, Zener Barrier (Gas Groups A, B, C, and D)

34 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

Table 4-5 Electrical connections in a hazardous area

Figure 4-5 Electrical connection diagram when using Advanced Electronics, HART, MODBUS, and

Zener Barrier in a Hazardous Area (Gas Groups A, B, C and D)

Advanced Electronics with HART Multi-drop, and Zener Barrier (Gas Groups C and D)

Advanced Electronics with HART Multi-drop, Remote Display, Zener Barrier (Gas Groups C and D)

Electronics with HART Multi-drop, Remote Display, Galvanic Isolator (Gas Groups C and D)

Installation & Configuration Manual 35

Electrical Connections (Advanced)

Figure 4-6 Electrical connection diagram when using Advanced Electronics, HART, MODBUS,

Remote Display, and Zener Barrier in a Hazardous Area (Gas Groups A, B, C, and D)

36 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

Figure 4-7 Electrical connection diagram when using Advanced Electronics with HART Multi-drop,

and Zener Barrier in a Hazardous Area (Gas Groups C and D)

Installation & Configuration Manual 37

Electrical Connections (Advanced)

Figure 4-8 Electrical connection diagram when using Advanced Electronics with HART Multi-drop,

Remote Display, and Zener Barrier in a Hazardous Area (Gas Groups C and D)

38 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

Figure 4-9 Electronics with HART Multi-drop, Remote Display, and Galvanic Isolator in a Hazardous

Area (Gas Groups C and D)

4.6 Baseboard Configuration

The baseboard is supplied with one of the following two software versions:

• General software version - normally used in the food and process industries.

• Fiscal software version - normally used in Crude oil or refined petroleum applications.

The only difference between the two software versions is the available calculations.

Installation & Configuration Manual 39

Electrical Connections (Advanced)

Irrespective of which software version is running, when the unit is received from the factory, it is pre-configured to output the following signals:

Output Output Parameter

Analog 1 (4-20mA) Line density (700 to 1000 kg/m³)

Analog 2 (4-20mA) Temperature (0 to 100°C)

Pulse output Frequency (default)

For many applications, the factory default configuration described above will be quite acceptable. However, if any of the additional calculated parameters or different output ranges are required, then a simple Baseboard re-configuration can be performed using a Remote Display, or PC.

Alarm: Untriggered – High (default)

4.7 Baseboard plus HART

The HART

option board connects with the Baseboard using the 40-way connector provided and supported by two plastic posts. A tag is provided for connecting to the chassis earth point on the Baseboard.

The HART

option board is a loop-powered 4-20mA output which can support HART® communications or can be used to provide a third analog output. The unit is always designated as a

HART

For HART

slave unit, i.e. it only communicates when it receives a message asking it to do so.

communications, the option board output is regarded as the primary output, and the

baseboard outputs as the secondary and tertiary outputs.

4.7.1 Electrical Installation for HART

For safe area installations, electrical connections to the HART Figure 4-10.

• For installation of the CSA certified unit in a hazardous area, refer to Appendix H.

• For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety instructions booklet shipped with your unit (also available at www.micromotion.com).

In safe areas, up to 15 HART should be attached in parallel across the two points indicated as X and Y in Figure 4-10. If more than one HART

Advanced unit is installed on a single HART® communication link, each unit must be given a unique HART non-zero value, the output current is automatically set at 4 mA.

Option Board

Communications

option board are shown in

slave units may be installed on one HART® communication link. They

slave address in the range 1 to 15. Whenever the HART® address is set to a

40 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Advanced)

Hand Held

Communicator

Analogue +

Analogue -

HCC

HART

Optio n B oard

Sla ve Devi c e

Power Supply

Master

HART Device

Network

Resistance

23 0 t o 50 0Ω

Figure 4-10 HART® Option Board Electrical Connection Diagram



4.8 Advanced Density Post-Installation Checks

After installation, the following procedure will indicate to a high degree of confidence that the meter and Advanced system is operating correctly.

1. Measure the supply voltage at the meter amplifier (PL2, pins 7 and 8). This voltage should be within the limits of 9.5 to 24Vdc in safe areas and 9.5 to 20Vdc in hazardous areas. In safe areas, the current to the baseboard should not exceed 80mA.

2. With the meter empty, clean and dry, measure the periodic time of the output signal and check that it is as specified on the meter calibration certificate (air check), to within the limits given in the table below.

Meter type Air check limit at 20 °C Added temperature effect

7835 ±60 ns ±10 ns / °C 7845/47 ±60 ns – 300 ns / °C

Installation & Configuration Manual 41

Electrical Connections (Advanced)

42 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 5

Electrical Connections (Entrained Gas Option)

5.1 General

This chapter concerns the operation of 7845/47 liquid density meters when fitted with the Standard Entrained Gas amplifier.

7845/47 Entrained Gas Liquid Density Meters with Standard Electronics are NOT intrinsically safe.

5.2 Ground Connections

The earthing pads on the mounting face of the amplifier unit MUST make good contact with the meter case by the M3 cage nuts. The external earth bonding point of the meter is located inside the maintaining amplifier housing. The meter should be grounded via the pipework.

The 0V power supply lead should be earthed at the supply end, or at the safety barriers if applicable.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

5.3 Use with Signal Converters

The 7845/47 E.G. Liquid Density Meter (with Standard Electronics)/signal converter system can only be operated in SAFE AREAS.

5.3.1 System Connections

The density system connections are illustrated in Figure 5-1 below.

Installation & Configuration Manual 43

Electrical Connections (Entrained Gas Option)

Figure 5-1 Electrical connection diagram (7945/47 E.G. to Signal Converters)

5.4 Use with Customer’s Own Equipment

5.4.1 System Connections for Safe Areas

7845/47 Entrained Gas Liquid Density Meters with Standard Electronics are NOT intrinsically safe.

Power supply to Density Meter: 15.5 V to 33 V d.c., 25 mA min.

Power supply to RTD: 5 mA max.

The frequency at which the meter is operating can be detected by using a series resistor in the +VE power line. The value of resistance to be used for a given supply voltage must not exceed the value obtained from the LOAD NOMOGRAM (Figure 5-2). The electrical connections to be made are shown in Figure 5-3.

44 Micro Motion 7835/45/47 Liquid Density Meters

Electrical Connections (Entrained Gas Option)

7845/47 E.G.

PRT

See Note

POWER +VE

SIGNAL +VE

POWER -VE

SIGNAL -VE

PRT SUPPLY +VE

PRT SIGNAL

PRT SUPPLY -VE

POS +

NEG -

SIG

Note: See Load Nomogram (Figure 5.2) to determine R value.

1μF

Figure 5-2 Load Resistance Nomogram

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

Figure 5-3 Electrical Connection Diagram – 7845/47 E.G. to Customer’s Own Equipment (SAFE

AREAS)

Installation & Configuration Manual 45

Electrical Connections (Entrained Gas Option)

5.5 Post-Installation Checks

After installation, the following procedure will indicate that, to a high degree of confidence, the meter is operating correctly.

1. Measure the current consumption and the supply voltage at the meter amplifier. This should be within the limits:

• 15.5V to 33V d.c.

•75mA

±10mA

With the meter empty, clean and dry, measure the periodic time of the output signal and check that it is as specified on the meter calibration certificate (air check), to within acceptable limits (e.g. 500ns), after making allowances for different ambient conditions.

46 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 6

Calibration and Performance

6.1 General

The 7835/45/47 liquid density meters (including Entrained Gas versions) are calibrated at the factory, and are supplied with their own test and calibration certificates.

The calibration certificate specifies various calibration constants that allow the user to convert the output periodic time signal from the meter into a density value. (See Appendix E for specimen calibration certificates.)

6.1.1 For Standard Electronics Units

For units with Standard electronics, the calibration constants will need to be programmed into a signal processing instrument such as a signal converter. Density calculations are performed on the signal processing instrument.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

6.1.2 For Advanced Electronics Units

For units with Advanced electronics, the calibration constants are pre-programmed into the electronics and normally require no further consideration. The calculations in this chapter are performed by the electronics on the meter.

Important Information

If you have obtained a replacement calibration certificate for an Advanced Electronics unit, the set of pressure coefficient constants K20A, K20B, K21A and K21B that fall within your operating pressure range can be programmed into the Advanced Electronics using ADView or ProLink II software (downloadable from web sites listed on the back page).

(If your operating pressure range falls between two of the sets of operating pressure ranges on the new certificate, contact the factory for a new calibration certificate.)

The Advanced Electronics keeps a write-protected copy and a working copy of all coefficients. The integrity of the working coefficients is safe, and so for simplicity it is recommended that the working coefficients only be changed. This is achieved by writing to registers 131 and 132. (See Chapter 8 for a guide to using ADView or ProLink II.)

Alternatively, a new FRAM memory chip can be issued which holds the calibration coefficients. However, in replacing the FRAM device some user configured data may be lost (e.g. upper and lower limits on the analog outputs, matrix referral points, special function, user defined line pressure etc.).

Installation & Configuration Manual 47

Calibration and Performance

The general density equation is: D = KK K01 2

ττ

Where :

D = The un cor rected densi ty (kg/m

) of liqui d

= Periodic time (μs) of v ibration

= 1/f where ‘f’’ is the frequency of vibration

2&1,0 KKK = Constants fr om the Calibration Certificate

The e qua t ion used for thi s cor recti on is :

()

[]

()

DKt Kt11820 1920+−+−

Where:

= Te mper ature co rrec ted d ensi ty (kg/ m3)

D = Densi ty ca lcul at ed using eq uat ion 1

t = Temperature (degrees C)

K and K18 19 = Constants from the Calibration Certificate

6.2 Interpretation of calibration certificate

6.2.1 General density equation

The basic meter constants, K0, K1, and K2 are computed from the factory calibration on three fluids. Using these constants and the general density equation, the density of the liquid within the meter can be calculated.

It is stated on the calibration certificate that the basic constants are determined from a calibration at a temperature of 20 °C (68 °F) and at a pressure of 1 bar (14.5 psi). If the operating conditions of the meter differ from that of the calibration conditions, a correction to the density calculated using the general equation is required.

6.2.2 Temperature correction

If the meter operates at temperatures other than 20 °C (68 °F), a correction to the density calculated using equation (1) must be made using the temperature coefficient data given on the calibration certificate.

6.2.3 Pressure correction

The meter design has a unique facility to reduce the influence of the line pressure on the density measurement but there is a residual effect for which correction may be required. This residual pressure effect before a pressure correction is illustrated for the 7835/45/47 meter in the following figures.

48 Micro Motion 7835/45/47 Liquid Density Meters

Calibration and Performance

-10

0 20 40 60 80 100 120 140

Pressure (Bar Absolute)

Density Offset (kg/m

)

Uncorrected pressure effects on the meter fall within these bands

0 5 10 15 20

Pressure (Bar Absolute)

Density Offset (kg/m

)

Figure 6-1 Pressure effect on the7835/45/47 meter before pressure correction (at 20°C)

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

Figure 6-2 Pressure effect on 7845/47 Entrained Gas before pressure correction (at 20°C)

Installation & Configuration Manual 49

Calibration and Performance

The equation used to apply pressure correction is:

()

[]

()

DKP KP

120 1 21 1+−+−

Where:

= Temper ature an d pressure cor rec te d d ensity (kg/m3)

= Tem per at ure correct ed d ensity (kg/ m3)

P = Pressure in bar absolute

K 20 =

()

KAKBP20 20 1+−

K 21 =

()

KAKBP21 21 1+−

During the calibration of the meter, which is normally performed at a pressure of 1 bar (14.5 psi), the pressure influence is also measured. This data is also shown on the calibration certificate (see Appendix E).

Note: K20A, K20B, K21A, and K21B are the pressure coefficient constants on the calibration certificate.

Note: The pressure correction is further enhanced on units that operate above 41 bar (595 psi) by having sets of pressure coefficient constants covering subsets of the full operating pressure range. Only one set of pressure coefficient constants is selected from your calibration certificate according to your operating pressure range. If your operating pressure range falls within the range of two sets of pressure coefficient constants, contact Micro Motion for a new calibration certificate. See Appendix E for an example calibration certificate.

Note: If it is required to apply temperature and pressure corrections, the temperature correction is applied first.

Figure 6-3 shows the typical residual error curves after pressure corrections for 7835 (100Bar) units using three sets of pressure coefficient constants. Each set covers a sub-set of the 100Bar range. The uncertainty specification for a 7835 is indicated by the upper and lower limit lines. The uncertainty for the 7835 pressure coefficients is uncertainty of

Note: Only one set of pressure coefficient constants is selected from your calibration certificate according to your operating pressure range. For specimen calibration certificates, see Appendix E.

±0.15 kg/m

±0.003 kg/m

. This is in addition to the instrument calibration

50 Micro Motion 7835/45/47 Liquid Density Meters

Calibration and Performance

-1.00

-0.80

-0.60

-0.40

-0.20

0.00

0.20

0.40

0.60

0.80

1.00

0 1020 3040 5060708090100110

Pressure (BarG)

Magnitude (kg/m3)

New K20 K21

Uppe r limit

Low er limit

-1.00

-0.80

-0.60

-0.40

-0.20

0.00

0.20

0.40

0.60

0.80

1.00

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160

P r e ssure ( Ba r G )

Magnitude (kg/m3)

New K20 K21

Upper limit

Low e r limit

Figure 6-3 Residual pressure effect after pressure correction – 7835 (100Bar) units (at 20°C)

Figure 6-4 shows the typical residual error curves after pressure correction for 7835 150Bar units using four sets of pressure coefficient constants. Each set covers a sub-set of the 150Bar range. The uncertainty specification for a 7835 is indicated by the upper and lower limit lines. The uncertainty for the 7835 pressure coefficients is ±0.003 kg/m uncertainty of +/-0.15kg/m

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

. This is in addition to the instrument calibration

Note: Only one set of pressure coefficient constants is selected from your calibration certificate according to your operating pressure range. For specimen calibration certificates, see Appendix E.

Figure 6-4 Residual pressure effect after pressure correction – 7835 (150Bar) units (at 20°C)

Figure 6-5 shows the typical residual error curves after pressure correction for 7845K (100Bar) units using three sets of pressure coefficient constants. Each set covers a sub-set of the 100Bar range. The 7845 uncertainty specification is indicated by the upper and lower limit lines. The uncertainty for the 7845K pressure coefficients is ±0.006kg/m uncertainty of +/-0.035kg/m3.

Installation & Configuration Manual 51

. This is in addition to our stated instrument calibration

Calibration and Performance

-1.50

-1.00

-0.50

0.00

0.50

1.00

1.50

0 102030405060708090100110

Pressure (BarG)

Magnitude (kg/m3)

New K20 K21

Upp er limit

Low er limit

-1.00

-0.80

-0.60

-0.40

-0.20

0.00

0.20

0.40

0.60

0.80

1.00

0 102030405060

Pressure (BarG)

Magnitude (kg/m3)

New K20 K21

Upper limit

Low e r limit

Note: Only one set of pressure coefficient constants is selected from your calibration certificate according to your operating pressure range. For specimen calibration certificates, see Appendix E.

Figure 6-5 Residual pressure effect after pressure correction – 7845K (100Bar) units (at 20°C)

Figure 6-6 shows the typical residual error curves after pressure correction for 7845 (50Bar) units using one set of pressure coefficient constants. The set covers the full 50 Bar range. The 7845 uncertainty specification is indicated by the upper and lower limit lines. The uncertainty for the 7845K pressure coefficients is ±0.006kg/m uncertainty of +/-0.035kg/m3.

Note: Only one set of pressure coefficient constants is selected from your calibration certificate according to your operating pressure range. For specimen calibration certificates, see Appendix E.

Figure 6-6 Residual pressure effect after pressure correction – 7845 (50Bar) units (at 20°C)

52 Micro Motion 7835/45/47 Liquid Density Meters

. This is in addition to our stated instrument calibration

Calibration and Performance

Alternatively, the following equations may be used:

VOS

Dp 1

14 06

1400

×−

⎛ ⎝

⎜

⎞ ⎠

⎟

⎡

⎣

⎢

⎤

⎦

⎥

. E

DVV

PCA

Where:

VOS

(kg/m3)

= Temperature and pressure corrected density (kg/m3)

= Calibration VOS (m/s)

= Liquid VOS (m/s)

can be obtained direct from Figure 5.2 or may b e calculated as follows:

= 100 1455+ . D

for a DP of 300kg/m3 to 1100k g/m3

= 2690 09− . D

for a DP of 1100kg/m3 to 1600kg/m3

Optimization for pressure-temperature coupling effect (7835 meters only)

For the calibration of 7835 meters, a new generic constant is being applied to calculate the K21A pressure coefficient that is valid for use over a limited operating temperature and pressure range. The revised K21A pressure coefficient is selected from a table in a new format calibration certificate and is unique to the 7835 meter. The application of this K21A coefficient does not change the density calibration coefficient format or the density calibration equations previously used in the flow computer software.

Note: This constant can only be applied to 7835 meters that have been calibrated at the factory beginning in January 2011. Additionally, it is not possible to recalculate a revised K21A for units that have been recertified at external calibration facilities.

The new constant is being applied as an intermediary measure to meet the requirements of the United Kingdom Department of Energy and Climate Change (DECC) directive regarding the calibration of liquid density meters. The DECC directive recommended that by July 2011 all density meters be calibrated at the anticipated operating conditions (such as simultaneously at temperature and pressure). Micro Motion is in process of redesigning the calibration stands so that they can operate at a combined elevated temperature and pressure. These stands are planned to be completed and operational by July 2011.

For an example of the calibration certificate that includes the new K21A pressure coefficients, see Appendix E.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

6.2.4 Velocity of sound correction

The Velocity of Sound (VOS) in the process liquid may have an effect on the accuracy of the indicated density. The calibration of the 7835 meter has been optimized to a density/VOS relationship as indicated in Figure 6-7. If the VOS of the process fluid deviates substantially from the relationship in Figure 6-7, it may be desirable to apply a correction. This may be achieved by the simple introduction of a calibration offset using the data in Figure 6-7. Adjustment of the value basic equation will achieve this.

Vel ocit y of s ou nd and tem perat ure correct ed d ensity

in the

Installation & Configuration Manual 53

Calibration and Performance

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

800

000

120

1400

160

Indicated Density (kg/m3)

Velocity of Sound (m/s)

+2kg/m3

Nominal

-2kg/m3

Values shown are the required corrections True density = Indicated density + Corrections

Figure 6-7 Optimized velocity of sound relationship for the 7835/45/47 meter

6.3 Calibration

6.3.1 Factory calibration

The 7835/45/47 liquid density meters are calibrated prior to leaving the factory against Transfer Standard instruments, traceable to National Standards. Three fluids are used in the calibration – ambient air whose density is derived from look-up tables, hydrocarbon oil of about 815 kg/m

and a high-density fluid in the range 1400 to 1500 kg/m

density. Several of the instruments-under-test are connected in parallel between two Transfer Standard Instruments on the Micro Motion special flow rig. During a calibration, and as the liquid flows through the instruments, readings are only taken when the indicated densities on the two Transfer Standard Instruments agree. In this way, a high integrity of calibration is achieved.

Measurements are also made under conditions of changing temperature and pressure to establish the magnitude of these effects on the instrument. From all this data, a calibration certificate is generated for each instrument.

Samples of the instruments are further tested by the Micro Motion Quality Assurance Department to

54 Micro Motion 7835/45/47 Liquid Density Meters

verify the calibration.

6.3.2 Calibration of transfer standards

The Transfer Standard instruments used in the calibration are selected instruments that are calibrated and certified by the ISO/IEC17025-certified calibration laboratory.

Transfer Standard calibration uses a number of ‘density certified’ liquids. The densities of these certified liquids are obtained using the Primary measurement system, whereby glass sinkers of defined volumes are weighed in samples of the liquids.

density

Calibration and Performance

Calibration is performed by pumping each certified liquid through the Transfer Standard in a closely controlled manner and recording the output signal in each case. A calibration certificate is issued for each Transfer Standard.

Calibrations are repeated, typically every six months, producing a well-documented density standard.

6.3.3 Instrument calibration certificate

Each instrument is issued with its own calibration certificate (see Appendix E for samples), containing four important pieces of data:

• The instrument serial number.

• The output signal/density relationship. This is based on three calibration points – air, medium density and high-density fluids. The air and high density fluid points are offset to achieve the product velocity of sound/density profile described earlier. However, the signal value at Air Density is also given for check purposes.

• Temperature coefficient data, describing the correction which should be applied to achieve the best accuracy if the instrument is operating at product temperatures other than 20 °C (68 °F).

• Pressure coefficient data, describing the correction that should be applied to achieve the best accuracy if the instrument is operating at elevated pressures.

A second page of the calibration certificate is retained by Micro Motion and contains all the calibration measurements.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

6.3.4 Pressure test

A hydrostatic pressure test is carried out to a pressure value specified on the instrument label and on the instrument calibration certificate. This test loads the instrument structure to a pressure that exceeds the maximum permitted operating pressure of the instrument.

Note: During manufacture, the welded structure is pressure tested to conform to the requirements of EN50018:1997. The outer case is able to withstand 100 bar of internal pressure in the event of tube/bellows failure.

6.3.5 Insulation test

To comply with Intrinsic Safety requirements, a 500 Vac insulation test is carried out between the electrical terminals and the instrument case.

6.3.6 Calibration check methods

There are two methods employed in calibration checks:

• Air checkpoint, which is simple and convenient and highlights long term drift, corrosion and deposition.

• Liquid calibration verification comprising two choices:

- Drawing off a sample of the liquid being measured and obtaining its density, using a

hydrometer (for stable liquids) or pyknometer (for unstable liquids).

- Using a second density meter.

Ambient air check

1. Isolate, drain and if necessary, disconnect the meter from the pipeline.

Installation & Configuration Manual 55

Calibration and Performance

2. Clean and dry the wetted parts of the meter and leave them open to the ambient air.

3. Apply power to the instrument and check that the time period of the output signal agrees with the 'Air Check' figure shown in the calibration certificate, to within acceptable limits.

Some variation between the two figures is to be expected due to changes in ambient air conditions. The density indication if using the K0, K1 and K2 factors will be about –0.9 kg/m because the basic density equation has been optimized for best performance over the normal operating density range.

This test will indicate whether there has been a calibration offsets due to corrosion, deposition or long term drift. When this test is applied to the the meters, their temperature coefficient has a significant effect and must be considered. The following table shows the temperature correction for the 7835 and 7845 Standard and Entrained Gas versions.

Temperature

Meter

7835 ±10 ns/°C ±60 ns

7845 –300 ns/°C ±60 ns

7845 Entrained Gas

correction

–700 ns/°C ±500 ns

Air check limit at 20 °C

4. Reconnect the meter to the pipeline if serviceable, or remove it for further servicing.

Liquid density check – sample method

If it is necessary to verify the calibration using liquid at operating conditions, then the following sample methods are recommended:

For Stable Liquids:

1. Draw off a sample of the liquid into a suitable container, at the same time noting the indicated density, temperature and pressure of the liquid.

2. Measure the density of the sample under defined laboratory conditions, using a hydrometer or other suitable instrument.

3. Refer the density measurement under laboratory conditions to that under the line operating conditions of temperature and pressure.

4. Compare the referred density figure with that indicated by the density meter.

Note: It is essential that a good understanding of the physical properties (temperature coefficient, etc.) of the liquid is acquired when using this method.

For Unstable Liquids:

1. Couple a pressure pyknometer and its associated pipework to the pipeline so that a sample of the liquid flows through it.

2. When equilibrium conditions are reached, the meter density reading is noted as the pyknometer is isolated from the sample flow.

3. Remove the pyknometer for weighing to establish the product density.

4. Compare the pyknometer registered density with that obtained from the meter.

Sampling Techniques

Sampling should comply with the international sampling standards (ISO 3171, ASTM D 4177, API

8.2 and IP 6.2).

56 Micro Motion 7835/45/47 Liquid Density Meters

Calibration and Performance

For further details of these procedures, reference should be made to:

Institute of Petroleum: Petroleum Measurement Manual

American Petroleum Institute: Manual of Petroleum Measurement Standards

Liquid density check – second density meter

It is often the practice, especially in fiscal metering applications, to use two or more density meters in a continuous measurement mode as a means of improving the integrity of the measurement system. Any unacceptable discrepancies between the measurements can immediately raise the necessary alarm signals.

1. Connect the second density meter to the pipeline adjacent to meter being checked so that it receives the same sample of fluid under the same conditions of temperature and pressure as the meter under test.

Part VII Section 1 – Method IP 160 (Hydrometer Method)

(BS2000–160, ISO3675, ASTM 1298)

Part VII Section 2 – Continuous Density Measurement

Chapter 14 – Natural Gas Fluids – Section 6:

Installing and proving density meters used to measure hydrocarbon liquid with densities between 0.3 and 0.7 g/cc at

15.56 °C (60 °F) and saturation vapor pressure, 1991.

2. Connect the second meter to its readout equipment, switch on and allow both systems to reach equilibrium conditions.

3. Compare the two readings, making any necessary corrections.

This method of automatic checking has proved to be a very successful technique and where there is a facility for two instruments, the practice of exchanging one for a newly calibrated instrument is proving successful. This is sometimes referred to as the "Substitution Method".

It is very important when using one instrument to verify the performance of a second and similar instrument, to ensure there are no unaccounted for systematic errors which would are not highlighted.

6.4 Performance

Micro Motion meters are generally calibrated using specified fluids at 20 °C and 1 bar absolute. When operating at other conditions, it is necessary to increase the uncertainty of measurement by the magnitude of the offsets if no corrections are applied or by a fraction of the offsets if corrections are applied.

The following table lists the sources and magnitudes of the offsets affecting the meters covered in this manual (including an example below).

Table 6-1. Source and magnitude of measurement offsets

Error source 7835 7845/47 7845/47 Entrained Gas

A Primary Standard 0.05 kg/m

B Transfer Standard 0.1 kg/m

C Instrument Accuracy (at

calibration conditions)

0.15 kg/m

0.05 kg/m

0.1 kg/m

30.15 kg/m

0.05 kg/m

0.1 kg/m

1.0 kg/m

57 Micro Motion 7835/45/47 Liquid Density Meters

Calibration and Performance

22222

GFEDC ++++

Table 6-1. Source and magnitude of measurement offsets

D Temperature (uncorrected)

Temperature (corrected)

E Pressure (uncorr’d at 50 bar)

Pressure (uncorr’d at 100 bar) Pressure (corrected)

F Velocity of Sound (uncorr’d)

Velocity of Sound (corrected)

G Long term stability 0.15 kg/m

0.02 kg/m3/deg C

0.005 kg/m

–1 to +2 kg/m +7 to +15 kg/m

/deg C

0.003 kg/m3/bar

See Section 6.2 20% of offset

/year 0.35 kg/m3/year 1.0 kg/m3/year

For total operational accuracy, the square root of the sum of the squares of each error source (C to G) is recommended, such as:

• Effective Total =

For example, if we consider instruments operating at 50 °C (122 °F) and 50 bar, six months after calibration and with no VOS offset, the total operational accuracy after corrections have been applied is derived as follows:

Table 6-2. Total operational accuracy for example quoted

0.9 kg/m

0.05 kg/m

0 to +8 kg/m

---

0.006 kg/m

/deg C

/bar

See Section 6.2 20% of offset

1.2 kg/m

0.5 kg/m

/deg C

–40 to +40 kg/m

---

Error Source 7835 7845/47

0.15 0.35

0.15 1.5

0.15 0.30

––

0.07 0.175

Effective Total 0.27 1.58

For better accuracy, it would be necessary to carry out an on-line calibration at the operating conditions. Higher accuracy can be obtained, by request, for all instruments by the use of water calibration or by UKAS certified laboratory calibration of selected fluids.

Note: The tables above relate to the effect of uncertainties on the time period output of the meter, and do not take into account any uncertainty in the measurement of the time period itself.

58 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 7

7965 DISPLAY

BaseD

LineD

S.G. Tem

987.7 K /m

123.400 °

777.0 K /m

21.3 °

Remote Display and Digital Communications

7.1 Introduction

The Advanced Baseboard provides an RS-485 digital communications link which can be used to communicate, using RTU Modbus communications protocol, with either a 7965 Remote Display or computer device up to 3280 ft (1000 m) from the meter. (Only one controlling device is permitted on the RS-485 link at any one time.) It provides a convenient means for configuring the Baseboard and for displaying or logging measurement data.

Figure 7-1 Advanced baseboard with RS-485 digital communications link

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

The RS-485 link will support multi-drop installations where, for example, one Remote Display can communicate with several Advanced units at the same time.

7.2 Mechanical Installation of the 7965 Remote Display

The 7965 Remote Display is suitable for handheld or wall-mounted operation, and is designed for use in both safe and hazardous areas.

Take care not to scratch the transparent front screen.

To install the 7965 Remote Display, the front display section must be separated from its backplate. First, gently prise off both cover plates by using a small screwdriver inserted into a slot at the corner of the cover. This reveals the four clamping screws that hold the front section to the backplate; undo these and separate the two parts.

Installation & Configuration Manual 59

Remote Display and Digital Communications

Cover plates

Clamping screws

Slots for removing cover plates

7965 DISPLAY

Figure 7-2 Installation of the 7965 Remote Display

The display may be wall mounted by first screwing the backplate to the wall through the holes spaced as shown below, and then screwing the main enclosure to the back plate with the clamping screws.

Figure 7-3 7965 Remote Display Dimensions

60 Micro Motion 7835/45/47 Liquid Density Meters

Remote Display and Digital Communications

7965 DISPLAY

BaseD 777.0 Kg/m

LineD 987.7 Kg/m

S.G. 0.778 ° Temp 21.3 °

7.3 Safe Area Electrical installation

Electrical installation of the Remote Display in a safe area is shown in Chapter 3. The maximum resistance on the power lines between the Baseboard and the Remote Display is 60Ω, which equates to a maximum cable length of 750 meters (2500 ft) for a cable of dc resistance 40Ω/km (12Ω/ 1000ft). If the Remote Display is to be operated at distances of up to 1000 meters (3280 ft) from the meter, it should be powered locally with a supply in the range 8 to 28 volts.

7.4 Hazardous Area Electrical installation

When installing in hazardous areas, contact the factory for wiring information. Please also refer to ATEX safety instruction booklet 79655010/SI for information on safety matters.

7.5 Configuring the Baseboard using the Remote Display

On either side of the liquid crystal display there are four press-keys, each of which corresponds to one of the four lines of text. These keys are used for entering data and for navigating the menu.

Figure 7-4 7965 Remote Display Press Keys

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For security purposes, a connector, located within the enclosure, can be set to disable the keypad so that the Remote Display simply displays measurement data. For additional security, password control may be used to restrict access to certain areas of the menu structure.

7.5.1 Power-up

Once the electrical installation is completed, the meter and display can be powered-up. The Remote Display undergoes a sequence of self-checks and should then give a display similar to the one above. If not, it will produce the screen shown below which indicates that communication between the meter and display has not been established.

Installation & Configuration Manual 61

Remote Display and Digital Communications

7965 DISPLAY

No devices replying < Enter demo mode > < Try again >

< Change setup >

Figure 7-5 7965 Remote Display Installation Error Message

Failure to establish communications is normally due to incorrect electrical installation or incorrect meter slave address (see below).

7.5.2 Slave address

Each meter is given a Modbus slave address. The factory default slave address is 1 (one). By entering the [Change setup] section of the display menu, the Remote Display can be configured to communicate with any valid slave address (i.e. in the range 1 to 247), or to poll all slave addresses in any given range.

If more than one meter is connected to a single display then each meter should be given a different slave address (see Section 7.5.2). If the slave address has to be changed, it is recommended that the lowest unused slave address be used.

7.5.3 Demo mode

The demo or demonstration mode allows the user to explore the Display menu structure without a meter attached.

7.5.4 Navigating the menu structure

Access to the menu structure is obtained by pressing any of the 8 keys either side of the display, giving the following menu-screen:

62 Micro Motion 7835/45/47 Liquid Density Meters

Remote Display and Digital Communications

7965 DISPLAY

Process variables Outputs Transducer setup

↓

ade

solartro

so lartron

arnborough, Hamps

Made in the U.K. by Solartron,

ou gh, Hamps

Farnborough, Hampshire, England.

sola rtron

P re s su re Communications

Figure 7-6 7965 Remote Display Menu Screen

Corresponding to each line of text, there are two keys, one either side of the display. Unless indicated otherwise, the keys on either side of the display perform the same function.

Over 100 separate menu screens are provided. However, after a few minutes of familiarization, the user should find it simple to navigate through the entire menu.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

Figure 7-7 Remote Display Menu Screens Sequence

7965 D ISPLAY

ineD 987.7 kg/m aseD 967.4 kg/m . G . 98 .0 0 e m p 21 .3 °

in the U.K. by Solartron

Farn bo rou gh , Hampshire, Engl and

796 5 DI SP LAY

Diagnostics Servic Finish

Made in the U.K. by Solartron

The menu structure can be thought of as being cyclic, so that, that by repeatedly pressing the downward arrows (↓), the user will eventually end up back at the first screen.

so la r tro

79 65 D ISP L A

et Referral Matri o c al s e tu

Farnbor

hire, Englan

so la rtron

Made in the U. K. by Solartron

79 65 DI SP LAY

rocess variable ut pu t ransducer setup

Made in the U.K. by Solartron

F arnb or oug h, Hamp s hir e, England.

79 65 DI SPLA Y

hire, England.

Some menu items lead to another level of menus, which are also cyclic. In some cases, there are several levels of menus. The simplest way of getting to know these levels is to experiment.

Installation & Configuration Manual 63

Remote Display and Digital Communications

If required, the Remote Display can be reset by pressing the four corner keys together and holding them down for about 2 seconds. When this is done, the Remote Display will re-establish communication with the meter and will bring back the front menu page displaying measurement data, from which the menu structure can be accessed once again.

7.5.5 Menu Structure

The tables below represent some of the top-level menu screens.

Menu-screen 1 at Level 1

Process variables Outputs Meter setup

↓

Menu-screen 2 at Level 1

↑

Pressure Communications

↓

Menu-screen 3 at Level 1

↑

Set referral matrix Local setup

↓

Menu-screen 4 at Level 1

↑

Diagnostics Service Finish

(See Level 2 “Process Variables” menu below)

→

(See Level 2 “Outputs” menu below)

→

Set slave address, view meter serial no. etc.

→

Line pressure, atmospheric pressure, pressure units

→

Set device addresses, poll network again

→

Temperature points, referral temperature, referral points

→

(See “Local Setup” menu below)

→

(See “Diagnostics” menu below)

→

For service engineers only

→

Return to live display

→

Process Variables (PV) Menu (Level 2)

• PV Menu-screen 1

Line density units Base density units Temperature units

↓

Set line density units to kg/m³, lb/gal etc.

→

Set base density units to kg/m³, lb/gal etc.

→

Set temperature units to °C or °F.

→

• PV Menu-screen 2

↑

P.V. averaging Set special function

↓

64 Micro Motion 7835/45/47 Liquid Density Meters

Select special function

→

Select process variable averaging (1s, 2s, 5s etc.)

→

Remote Display and Digital Communications

• PV Menu-screen 3

↑

Density offset Temperature offset < Exit variables >

Set density offset factor

→

Set temperature offset factor

→

Outputs Menu (Level 2)

• Outputs Menu-screen 1

Analog output 1 Analog output 2

↓

• Outputs Menu-screen 2

↑

Pulse (freq / alarm) Alarm settings < Exit outputs >

Local Setup Menu (Level 2)

• LS Menu-screen 1

Menu language Screen contrast System warnings

↓

• LS Menu-screen 2

↑

S/W Version

< Exit local setup >

Set variable, 4mA and 20 mA points for Output 1

→

Set variable, 4mA and 20 mA points for Output 2

→

Set pulse output to be alarm status or tube frequency

→

Set alarm state, coverage and hysteresis

→

Select menu language (currently only English)

→

Set screen contrast

→

Turn system warnings on and off

→

View display unit details

→

Set device addresses, poll network again

→

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

Diagnostics Menu (Level 2)

• Diagnostics Menu-screen 1

Pickup level Q of resonance

↓

• Diagnostics Menu-screen 2

↑

Tube period RTD resistance

↓

• Diagnostics Menu-screen 3

↑

Change fixed values Fix meter readings < Exit diagnostics >

Enter values for density etc. to use when fixing readings

→

Fix density and temperature readings to set values

→

Installation & Configuration Manual 65

Remote Display and Digital Communications

+ Pwr

-Pwr A B

7965 DISPLAY

7.6 Multi-drop installation

For a multi-drop installation each meter is allocated a different slave address and linked together in parallel as shown below. Each meter must be individually programmed with its unique slave address using the PC or remote display before they are linked together. Up to 24 meters can be connected in such an arrangement, depending on the cable parameters.

Please note that the arrangement shown below is NOT

Figure 7-8 RS-485 Multidrop Arrangement

suitable for hazardous area installations.

Note: The meters must be given different slave addresses before

they are connected together in a

multidrop arrangement, otherwise there will be communications conflicts between the meters.

The Remote Display communicates with one meter at a time; to obtain information from several meters the Remote Display must be set, each time, to interrogate the individual meters.

7.7 Electrical installation of Computer Devices

Electrical installation of computer devices having an RS-485 serial port is the same as for a Remote Display, except that the power lines are not required.

When installing in hazardous areas, a safety barrier or galvanic isolator must be interposed between the RS-232/RS-485 converter and the meter – contact the factory for wiring information. Please also refer to ATEX safety instruction booklet 79655010/SI for information on safety matters.

Personal Computers (PCs) with an RS-232 serial port can readily communicate with the Baseboard using a line powered RS-232-to-RS-485 converter, as shown below.

66 Micro Motion 7835/45/47 Liquid Density Meters

Remote Display and Digital Communications

RS232 to RS485

CONVERTER

RS232

RS485

Figure 7-9 Advanced System Linked to a Personal Computer

In order for a computer device to communicate with an Advanced unit, a software program is required to generate and interpret Modbus messages. The information provided in Appendix H is intended to enable users to write their own Modbus software. For information on using ADView software, please see Chapter 8.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

7.7.1 Connections using an RS-232/485 Converter

Terminals 11 and 12 on the Advanced unit’s Baseboard are for RS-485 (Modbus) connections to the converter, as shown in Figure 7.8. Note: The PC and converter are always located in a non-hazardous (safe) area.

Converters are available from a number of sources, and can range from simple in-line devices that simply plug into a PC’s RS-232 port, to programmable devices with full isolation between the two networks.

The Advanced unit uses a half-duplex implementation of RS-485, such that the A and B signals are used for data transmission in both directions. This requires that the RTS line is toggled to indicate the transmission direction; it can be done by the host computer, or automatically by an RS-485/232 converter which has the facility to do so. If you are using Windows NT, 2000 or XP on your PC, you should use a converter which automatically changes RTS (as detailed below) otherwise the link may not work correctly.

The optional ADView software kit includes a K3 RS-485/RS-232 converter that is manufactured by KK Systems Ltd.

The K3 converter derives its power from the PC’s RS-232 port RTS or DTR line, which must be held permanently in the high state. This is normally adequate for short distances where there are only a few devices on the network. However, the ability of the port to supply sufficient power is not guaranteed, especially for laptop PCs, and it may be necessary to connect an external power supply. This may also be necessary if using Windows NT, 2000 or XP.

To check the voltage levels, measure the voltages on the RTS input (pin 7) and the DTR input (pin 4) while the converter is connected to the PC (or other RS-232 device). This procedure needs a break-out box (not supplied).

Whichever input is powering the converter must have at least +6V during communications. Where the power is found to be insufficient, a 9V dc supply can be plugged into the option DC Input socket (Figure 7-9). See also the manufacturer’s technical information for details.

Installation & Configuration Manual 67

Remote Display and Digital Communications

PC (+Adview)

1 (A)

2 (B)

K3-ADE

RS232/RS485

Converter

R S 2 3 2

R S 4 8 5

1 2

78 9101112

3 45

PL2

If you encounter communication difficulties with RS-485, swap over the ‘A’ and ‘B’ signal connections at one end of the network.

PC (+Adview)

K2-ADE

RS232/RS485

Converter

R S 2 3 2

9 (+9V)

9V dc

Power

Supply

RS232

5 (GND)

+6V to +16V dc

Figure 7-10 RS-485 connections < 50 meters

Figure 7-11 Powering the Converter with an External 9V dc Supply (Non-hazardous Area)

68 Micro Motion 7835/45/47 Liquid Density Meters

For permanent installations, and where the network length is more than 100 meters or so, use the DIN-rail mounted device KD485-ADE from KK Systems Ltd.

The KD485-ADE is three-way isolated, providing isolation between the two ports and the power supply. It requires a +7 to +35V power supply and typically takes 1 to 2W; (power consumption is largely independent of supply voltage). It is capable of working with Windows 98, NT, 2000 and XP. For a PC running Windows NT/2000/XP, the RTS connection can be omitted.

Remote Display and Digital Communications

Port 1

RS232

Port 2

RS485

KD485-ADE

RS232 to RS485 Interface Converter/Isolator

Switch

Port 1 GND

RTS In

Power Input

Port 1 GND

TxB

TxA

RxB

RxA

Figure 7-12 Modbus connections > 100 meters

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

The default configuration of the KD485-ADE has Port 2 configured for 9600 baud. The meter uses the following parameter settings, which are not selectable:

• Baud rate: 9600

• Bits: 8

• Parity: None

• Stop bits: 2

Figure 7-13 Switches on KD485-ADE

The switch on the KD485-ADE should be set with SW1 On (to enable half-duplex operation on Port

2), with the other three switches (SW2, SW3, SW4) set to Off.

Note: In most systems, the ground (GND) connection on pin 6 of port 2 will be unnecessary.

Installation & Configuration Manual 69

Remote Display and Digital Communications

70 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 8

Using ADView and ProLink II

8.1 Using ADView Software

8.1.1 What is ADView?

ADView is a software package provided by Micro Motion to enable you to:

• Configure our density and viscosity transmitters.

• View and save data from them.

• Check that they are functioning correctly.

ADView is installed on a PC and interacts with the density/viscosity transmitter through one of the PC’s standard serial (RS-232) ports.

ADView requires Microsoft’s Windows operating system: Windows 3.1, 95, 98, NT, 2000 or XP.

Note: To connect to an RS-485/Modbus device, such as the 7835, you will need an adapter between the PC and the meter (see Chapter 4).

ADView provides many useful facilities, such as:

• Setting up serial link to communicate with the meter.

• Configuring the transmitter.

• Displaying data in real time, or as a graph.

• Logging data to a file.

• Verifying correct operation of the system, and diagnosing faults.

• Loading or storing Modbus register values.

• Read/write to individual Modbus registers.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

8.1.2 Installing ADView

ADView software is available for the PC on a variety of media (for example, CD-ROM) and is freely available to download from the Micro Motion web site (at www.micromotion.com).

1. Identify the media containing the installation files for ADView.

2. Insert the media into an appropriate drive on your PC.

3. If the installation program does not begin automatically, run the set-up ‘.exe’ file that is on the media. This does vary between different PC operating systems. In general, open the File Manager or Windows Explorer, browse the drive containing the media and double-click on the set-up ‘.exe’.)

4. When the installation program starts, you will be asked to supply your name and organization name for registration purposes, and supply a directory path into which ADView’s files can be loaded (a default directory path will be suggested).

Installation & Configuration Manual 71

Using ADView and ProLink II

5. Follow the installation instructions until installation is complete. It will normally only take a

few minutes. You can abandon the installation if you need to do so.

8.1.3 Starting ADView

Start the ADView software by navigating through the Start Menu to the program entry of ADView 6. Left-click on it once and the window shown below will then appear.

Note: Developments in ADView may mean that the screen shots differ slightly from the ones you will see on your PC screen.

Each of the six icons gives you access to the various facilities of ADView. You can choose to connect a Modbus device to one of the PC’s serial ports, or you can use ADView’s built-in simulation of the meter.

To run the simulation, choose the appropriate density meter option. Then, click on the

Options > Simulate board response from the menu bar and choose

OK buttons, as necessary, to return to the

main ADView screen. When simulation is chosen, ADView ignores the serial port and supplies simulated data. However, you do still need to click on the by the Connect button. Then, click on the

OK buttons, as necessary, to return to the main ADView

Communications Setup button followed

screen.

Setting up serial communications

To operate with a real Modbus device, you will need to connect it to a suitable power supply (see the technical manual for the device) and need a connection to a serial port on the PC. Full details for connecting to the Modbus (RS-485) link on the meter are in Chapter 4.

72 Micro Motion 7835/45/47 Liquid Density Meters

Using ADView and ProLink II

ADView automatically configures the selected port with the correct settings for the device. For the meter, this is 9600 baud rate, 8 data bits, no parity, 1 stop bit, and Xon/Xoff (software) flow control.

8.1.4 Understanding ADView Features

ADView facilities

The main ADView window gives access to the various facilities available. A brief description of each is listed below. Using the facilities is largely intuitive so that you can quickly learn the system.

Communications Setup

Sets up and checks RS-232/RS-485 communications.

Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option) Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option) Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option) Calibration and Performance Using Adview and ProLink IIRemote Display and Digital Comm.Electrical Connections (EG Option)

Board Configuration

Enables you to select the measured parameter and range for the analog output, and to configure density referral by entering matrix values or K factors, as well as special calculations, line pressure and averaging time. Displays instantaneous values of a selectable output parameter and the analog output.

Data logging

Provides tabular data from transmitters of line and base density, temperature and special function. One parameter can be displayed as a graph. Data can also be logged to a file in either Excel (tab delimited) or Notepad (space delimited) formats. The frequency at which results are logged can be set, and logging can be started and stopped.

With this facility you can dump the contents of all (or selected) Modbus registers from the device, or alternatively transmit values to them. File format is selectable (Excel/tab delimited, or Notepad/Space delimited).

Transducer details

Shows a list of meter details such as type, serial number, calibration dates, software version, etc.

Diagnostics

Enables you to view:

- live sensor readings

- the status of the meter

- values of working coefficients You can also verify calculations.

Installation & Configuration Manual 73

Using ADView and ProLink II

Menu bar

File

Tools

Options

Window

Help

Exit Exit ADView program.

Health Check Determines whether the system is functioning correctly.

registers (see Section F.7)

Direct Comms. Enables you to specify exactly what will be transmitted on

the Serial link (see Appendix F).

Engineer Status Only used by Micro Motion service engineers.

Simulate board response/ Actual Board

Enable / disable screensaver Allows you to select between these two options. When

About ADView Displays software version number.

Allows you to select between these two options

enabled, the screensaver operates as configured by the Windows system settings.

Provides a means of opening or selecting ADView’s facilities.

Configuring a slave address

The factory configuration sets the slave address to 1. However, in many applications it will be necessary to allocate another address. In a multi-drop application, where several Modbus devices are connected on the same network, it is essential to configure unique slave addresses for each device.

To do this, you will need to run ADView and use the Register Read/Write facility. Check the value in Register 30 (Modbus Slave Address). If it is not the required value, enter the desired value and click on the write button. The meter will now be configured with the new slave address.

Board configuration

The board configuration controls the way in which the meter will process and present data, user settings, calibration constants and other factors. This data is stored in non-volatile memory known as registers; a full list of the registers used in the meter is given in Appendix F.

To configure the meter, it is necessary to write data into the configuration registers using the RS-485/Modbus link. ADView provides a convenient and graphical way of doing this without you needing to know about register addresses and data formats.

Certain parameters are not available for configuration by ADView, including the Density Offset value which may be required to fine tune the calibration of the meter. However, ADView does have tools for reading and writing to individual Modbus registers (using the and for direct communication on the Modbus (using

Tools > Direct Comms). More details and

Tools > Register Read/Write facility),

examples are given in Appendix F, but for the significant majority of applications these tools will not be required.

74 Micro Motion 7835/45/47 Liquid Density Meters

Using ADView and ProLink II

There is no facility within ADView or the meter to ‘reset’ to a default configuration. Therefore, before attempting any alterations to the configuration, you are strongly advised to use the Register Dump/Load facility in ADView to store the existing configuration. Then, if any mishap occurs, you will be able to restore the configuration from the saved file.

ADView’s Board Configuration window is shown below:

To exit from any of the configuration windows without making any changes, press the

Esc key on

your computer keyboard.

Density referral (Configure… button)

To configure the density referral calculation, you will need to enter the relevant information.

•For matrix referral, this is a set of four values of density for each of up to five different temperatures; Appendix D gives more details on this.

•For API referral, you can select the product type, which automatically adjusts the coefficients of the General Density Equation (see Chapter 6), or enter your own values.

Installation & Configuration Manual 75

Using ADView and ProLink II

The Log Setup button – which is activated when logging has been stopped – enables you to configure the frequency of logging, where the logged data will be filed, and the format of the data.

Display Selection dropdown list to select the transmitter and parameter to be displayed on the graph

For selecting the parameter to be logged.

Click Show Graph to configure and display graph

For multi-drop configurations, the output of up to three transmitters can be displayed simultaneously.

Tabular display of instantaneous output of transmitter.

Select analog output of another transmitter.

Click OK to close Data Logging window

Graphical representation of analog output.

Click Start to start logging.

Click Stop to stop logging

Special function (Configure… button)

The range of special functions (calculated parameters) that are available depends on the referral type selected.

Special Function API referral Matrix referral

Specific Gravity ✓✓

API° ✓

% mass ✓

% volume ✓

° Baumé ✓

° Brix ✓

User defined quartic ✓

None ✓✓

When you select the Special Function you require, the configuration window will alter to allow you to input the relevant parameters, if applicable. Note that you can only select one Special Function to be available at any one time.

When you are satisfied with the configuration, you should save it to a file, using the

Dump/Load

facility, as a safeguard against subsequent loss or alteration.

Data logging

ADView’s Data Logging function is a useful tool for checking setups and performing experimental data capture. The diagram below explains some of the features.

76 Micro Motion 7835/45/47 Liquid Density Meters

Using ADView and ProLink II

Address of unit being accessed

Enter desired filename for Dump, or required filename for Load.

Choose which sets of registers to save to file, or simply save all of them.

You can also specify individual registers.

Choose data delimiter

(Dump only)

Restore a previously saved set of register data from file.

Store the selected register data to a file.

This facility is essential for saving the configuration of your meter. You should use it to save the current configuration before you start to alter it, in order to restore it if things go wrong for any reason. Also, if you send the transmitter away for servicing or re-calibration, you should save the current configuration. Details are given below.

In a few cases, it may be useful to write directly to a single Modbus register. Two likely occasions for using this feature are to set the Slave Address of the unit and to configure a density offset. Appendix F has a complete list of the registers.

Before making any changes to individual registers, you should save the current configuration to a file (see Register DUMP/LOAD) to safeguard your configuration if anything goes wrong.

From ADView’s menu bar, select

Tools > Register Read/Write.

Installation & Configuration Manual 77

Using ADView and ProLink II

To see a complete list of Modbus register numbers and descriptors, click here.

Choose the one you want to access.

For non-numerical values, click here to see complete list of possible entries and select one to write into the register.

Enter numerical values directly.

The Write button causes the current value to be written to the selected register.

You can read and write to any number of registers. When you have done all you want to, click OK.

The Read button causes the current value of the chosen register to be displayed.

The current register number appears here.

8.2 Using ProLink II Software

8.2.1 Overview

ProLink II is a Windows-based configuration and management tool for Micro Motion transmitters. It provides complete access to transmitter functions and data.

This chapter provides basic information for connecting ProLink II to your transmitter. The following topics and procedures are discussed:

• Requirements (see Section 8.2.2)

• Configuration upload/download (see Section 8.2.4)

The instructions in this manual assume that users are already familiar with ProLink II software. For more information on using ProLink II, see the ProLink II manual.

8.2.2 Requirements

To use ProLink II with a 7835/45/47 liquid density meter, the following are required:

• ProLink II v2.9 or later

• Signal converter(s), to convert the PC port’s signal to the signal used by the transmitter

- For RS-485 connections, an RS-485 to RS-232 signal converter. See Section 4.5 for information.

- 25-pin to 9-pin adapter (if required by your PC)

8.2.3 Connecting from a PC to a transmitter

Table 8-1 describes the options for connecting ProLink II to your transmitter. See Section 4.4 and Section 4.5 for more information.

78 Micro Motion 7835/45/47 Liquid Density Meters

Using ADView and ProLink II

Table 8- 1 Connection options for 7835/45/47 liquid density meter

Connection Physical layer Protocol

RS-485 terminals or RS-485 network (see Section 4.5)

RS-485 Modbus

8.2.4 ProLink II configuration upload/download

ProLink II provides a configuration upload/download function which allows you to save configuration sets to your PC. This allows:

• Easy backup and restore of transmitter configuration

• Easy replication of configuration sets

Micro Motion recommends that all transmitter configurations be downloaded to a PC as soon as the configuration is complete.

To access the configuration upload/download function:

1. Connect ProLink II to your transmitter as described in Section 4.4 and Section 4.5.

2. In the ProLink II software application, open the

• To save a configuration file to a PC, use the

File menu.

Load from Xmtr to File option.

• To restore or load a configuration file to a transmitter, use the option.

8.2.5 ProLink II language

ProLink II can be configured for the following languages:

• English

•French

•German

To configure the ProLink II language, choose

Tools > Options.

In this manual, English is used as the ProLink II language.

Send to Xmtr from File

Installation & Configuration Manual 79

Using ADView and ProLink II

80 Micro Motion 7835/45/47 Liquid Density Meters

Chapter 9

General Maintenance

9.1 General

The 7835/45/47 liquid density meters have no moving parts, which reduces the maintenance requirement to simple visual checks for leaks and physical damage.

Check calibrations should be carried out at specified intervals in order to highlight any malfunction or deterioration in meter performance. If a fault or a drop in meter performance is discovered, further tests are required to identify the cause of the fault. Remedial action is limited to cleaning the tube, making good any poor connections and replacing the maintaining amplifier or, in extreme cases, the entire instrument.

Extreme care is required in the handling of the meter during transit, its installation into the pipeline and its removal from the pipeline.

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

9.2 Fault analysis

Faults generally fall into two main categories: erratic readings or readings outside limits.

• Erratic Readings

Normally caused by the presence of gas bubbles in the flowing liquid. Severe electrical interference or severe pipeline vibrations can also cause this effect.

• Readings Outside Limits

Normally caused by deposition and/or corrosion on the resonating tube.

Since an electrical fault could also cause either of the two faults, and since examination for deposition or corrosion requires the removal off-line of the meter, it is recommended that the electrical system be checked first.

9.3 General maintenance procedure

This procedure is recommended for any periodic maintenance carried out on the system and forms the basis of any faultfinding task.

9.4 Physical checks

Physical checks are as follows:

• Examine the meter and its mounting bracket, pipe couplings and electrical cables for signs of damage and corrosion.

• Check the meter for signs of fluid leakage and the state of the rupture plate.

Installation & Configuration Manual 81

General Maintenance

Notes:

• Any physical damage to the meter case or mounting brackets may have adverse effects on the meter performance and a full calibration would be advisable to verify its accuracy.

• Any oil leakage can generally be remedied by servicing.

9.4.1 Check calibration

Checking the calibration is as follows:

• Carry out a check calibration using methods detailed in Chapter 6.

• Compare the results obtained with the current calibration certificate figures to identify any substantial deterioration in the meter's performance or any malfunction.

Notes:

• A substantial drop in meter performance is likely due to a build-up of deposition on the vibrating tube, which can be removed by the application of a suitable solvent. See Section 9.4.2 below.

• Malfunctions may be the result of electrical/electronic faults in either the meter circuit or the readout equipment. The readout equipment should be proved before attention is directed to the meter as detailed under Section 9.4.2.

9.4.2 Remedial servicing

The required servicing falls into two categories – electrical and mechanical.

Electrical servicing

1. Follow the steps below.

Units with Advanced Electronics:

a. Check the voltage between terminals 7 and 8 is between 9.5 V and 28 V.

Units with Standard Electronics:

a. Carry out power supply and current consumption tests at the meter terminals. These

should give: 17 mA

± 1 mA at 15.5 V to 30 V.

b. Remove the power supply to the meter. If current consumption is suspect, replace the

meter amplifier.

c. Identify the drive coils (terminals 7 and 8) and disconnect the drive coil wires from the

amplifier. Measure the resistance of the drive coils. This should be: 95

± 5 ohms at 20 °C

(68 °F).

d. Reconnect the drive coil wires to the amplifier.

2. Identify the pick-up coils (terminals 9 and 10) and disconnect the pick-up coil wires from the amplifier. Measure the resistance of the pick-up coils. This should be: 95

± 5 ohms at 20 °C

(68 °F).

Reconnect the pick-up coil wires to the amplifier.

3. Follow the steps below.

Units with Advanced Electronics:

a. With no power to the unit, check the 100 Ω RTD element across terminals 4 and 7. The

value of the element resistance is temperature dependent. For this data, see Appendix F.

82 Micro Motion 7835/45/47 Liquid Density Meters

General Maintenance

Units with Standard Electronics:

a. Check the 100 Ω RTD element across the terminals 11 and 12 (ensure terminals 3 to 6 are

b. Check for continuity between terminals 11 and 3, and terminals 11 and 4, also from

4. Carry out an insulation test by removing all the input connections to the amplifier terminals (1 to 7 inclusive) and short-circuit the terminals together. Test their insulation resistance to the metal case using a 500 V dc insulation tester (current limited to 5 mA maximum). This resistance must be greater than 2 MΩ.

Remove the short-circuit, and reconnect the input leads if required.

Mechanical servicing

Mechanical servicing comprises mainly of keeping the inner surface of the vibrating tube clear of deposition and corrosion. Deposition may be removed by the use of a suitable solvent. Alternatively, the instrument can be removed from the pipeline and cleaned mechanically. Care is required to prevent damage to the inner surface of the tube during the cleaning.

disconnected). The value of the element resistance is temperature dependent. For this data, see the product specifications appendix.

terminals 12 to 5 and 12 to 6.

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

Great care is essential in handling the meter during transit, installation into the pipeline and removal from the pipeline.

Ensure that the meter is not transported when it contains hazardous fluids. This includes fluids which may have leaked into, and are still contained, within the case.

Installation & Configuration Manual 83

General Maintenance

84 Micro Motion 7835/45/47 Liquid Density Meters

Appendix A

7835 Specifications

A.1 Density performance

Accuracy

Operating Range

Repeatability

Stability

Process Temperature Effect (Corrected)

Process Pressure Effect (Corrected)

(1) Accuracy is dependent upon the calibraton option chosen. Density range for which this accuracy applies depends on the

calibration option chosen.

(2) Stated accuracy is for operating density range of 0.3 to 1.1 g/cc (300 - 1100 kg/m

(3) Temperature effect is the maximum measurement offset due to process fluid temperature changing away from the

density calibration temperature.

(4) Pressure effect is defined as the change in sensor density sensitivity due to process pressure changing away from the

calibration pressure. To determine factory calibration pressure, refer to calibration document shipped with the 7835. If data is unavailable, contact the factory.

(3)

(4)

±0.0001 g/cc ±0.00015 g/cc

Up to 3 g/cc Up to 3000 kg/m3

±0.00002 g/cc ±0.02 kg/m3

±0.00015 g/cc 0.15 kg/m

±0.000005 g/cc ±0.000278 g/cc

±0.000003 g/cc ±0.000021 g/cc

±0.1 kg/m ±0.15 kg/m

±0.005 kg/m ±0.278 kg/m

±0.003 kg/m ±0.021 kg/m

(Enhanced calibration) (Standard calibration)

(Per year)

(Per °C) (Per 100 °F)

(Per bar) (Per 100 psi)

(1)

(2)

A.2 Temperature specification

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

Operating Range

–58 °F to +230 °F (–50 °C to +110 °C)

A.2.1 Integral temperature sensor

Technology 100 Ohms RTD (4 wire)

Accuracy BS 1904 Class, DIN 43760 Class A.

Installation & Configuration Manual 85

7835 Specifications

A.3 Pressure ratings

Maximum operating pressure

Test pressure

PED compliance

Intrinsically safe (Ex ia) Explosion proof (Ex d)

Tested to 1.5 times the maximum operating pressure

Complies with European directive 97/23/EC on Pressure Equipment.

2175 psi (150 bar) 1450 psi (100 bar)

A.4 Hazardous area classifications

ATEX Intrinsically Safe

ATEX-approved I.S. 7835: Certification to EN 60079-0: 2006 and EN 60079-11: 2007 for use in Europe

7835 (Frequency Output):

7835 (Transmitter):

Remote Display (Optional)

ATEX Explosion Proof

ATEX-approved Ex d 7835: Certification for use in Europe

7835 (Frequency Output):

(7835****AJ****) ATEX II1G, Ex ia IIC T6 (Ta -40 °C...+40 °C)

(7835****DJ****) (7835****BJ****)

(7835****AK****) ATEX II2G Ex d IIB

T4 (Ta -40 °C...+70 °C) ATEX II1G, Ex ia IIB T4 (Ta -40 °C...+60 °C)

ATEX II1G, Ex ia IIC T4 (Ta -40 °C... +60 °C) ATEX II 1 G, Ex ia IIC, T4 (Ta -40 °C...+60 °C)

T6 (Ta -40 °C...+70 °C)

CSA Intrinsically Safe

CSA-approved I.S. 7835: Certification to CSA C22-2 No 142, CSA C22-2 No 175, UL 508 and UL 913 for use in Canada and USA

7835 (Frequency Output):

7835 (Transmitter) and optional Remote Display:

(7835****AL****) Class I, Division 1 Groups C & D, T3C

(7835****BL****) (7835****DL****)

Class I, Division 1, Groups A, B, C & D, T4 (Single instrument) Class I, Division 1, Groups C & D, T4 (Hart Multi-drop)

CSA Explosion Proof

CSA-approved Ex d 7835: Certification for use in Canada and USA

7835 (Frequency Output): (7835****AM****) Class I, Division 1 Groups C & D, T3C

86 Micro Motion 7835/45/47 Liquid Density Meters

7835 Specifications

A.5 OIML R117-1 classifications

Evaluation to OIML R117-1 Edition 2007 (E) and Measuring Instrument Directive (2004/22/EC) Annex MI-005

Viscosity range 0.75 cP to 50 cP (0.75 mPa

Density range 0.7 g/cc to 1.2 g/cc (700 kg/m

Temperature range ambient –40 °F to +158 °F (–40 °C to +70 °C)

Environmental class Mechanical: M2

Electromagnetic: E2

Maximum pressure Fluid temperature range Accuracy Class

• 928.2 psi (64 bar) • +23 °F to +131 °F (–5 °C to +55 °C) • 0.3

• 1450.4 psi (100 bar) • +32 °F to +104 °F (0 °C to 40 °C) • 0.3

• 1450.4 psi (100 bar) • +23 °F to +131 °F (–5 °C to +55 °C) • 1.0

·s to 50 mPa·s)

to 1200 kg/m3)

A.6 Electromagnetic compatibility

All versions conform to the latest international standards for EMC, and are compliant with EN 61326/IEC 61326.

A.7 Materials of construction

Wetted parts

Case finish

Flange

Ni-Span-C® and 316L Stainless steel

316L Stainless steel

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

A.8 Fluid containment

Recognizing the increased emphasis on safety by chemical, hydrocarbon, and process markets alike, these Micro Motion density meters have been enhanced by the introduction of an optional outer 725 psi (50 bar) or secondary 1450 psi (100 bar) pressure retaining capability. In the unlikely event of an instrument failure, the meter safely contains any leakage. As a further safety feature, all welds are qualified to ASME 9/EN ISO 15614–1 standards and can undergo dye penetration testing to ASME standards, if required. Furthermore, the flange welds may be x-rayed to most recognized international standards.

Case pressure

Case failure pressure

Standard Containment

Limited by the Case failure pressure specification below

Fitted with burst disc which will fail between 290–435 psi (20–30 bar)

Optional Outer Containment

725 psi (50 bar) Standard engineering practice

2900 psi (200 bar) 5727 psi (395 bar)

Optional Second Containment

1450 psi (100 bar) designed to B31.3

Glass to metal seal failure

Installation & Configuration Manual 87

A.9 Weight

Weight

Intrinsically safe (Ex ia) 48 lb (22 kg)

Explosion proof (Ex d) 77 lb (35 kg)

A.10 Electrical

Power supply (Frequency Output version)

Power supply (Transmitter version)

Outputs (Frequency Output version)

Outputs (Transmitter version)

16 to 28 VDC at 17 mA maximum

18 to 28 VDC at 80 mA

Current modulation on power supply line

Analog Accuracy Repeatability Out-of-range

Pulse output (Ex ia transmitter only)

Communications (Ex ia transmitter only)

2 (+1 with HART option board)

0.1% of reading plus 0.5% of full scale ±0.025% 2 to 20 mA on 4–20 mA (Programmable alarm state)

Open collector output. Alarm status or frequency.

RS-485, Modbus (standard), HART (optional)

88 Micro Motion 7835/45/47 Liquid Density Meters

Appendix B

7845/7847 Specifications

B.1 Density performance

Accuracy ±0.0001 g/cc

±0.00035 g/cc ±0.005 g/cc

±0.1 kg/m ±0.35 kg/m3 ±5.0 kg/m

(Enhanced calibration) (Standard calibration) (Entrained Gas Option)

(1)

(2)

(3)

Operating Range Up to 3 g/cc Up to 3000 kg/m3

Repeatability ±0.00005 g/cc

±0.001 g/cc

±0.05 kg/m ±1.0 kg/m

Stability ±0.00035 g/cc 0.35 kg/m

Process Temperature Effect (Corrected)

Process Pressure Effect (Corrected)

(1) Accuracy is dependent upon the calibraton option chosen. Density range for which this accuracy applies depends on the

calibration option chosen.

(2) Stated accuracy is for operating density range of 0.6 to 1.2 g/cc (600 – 1200 kg/m

1.6 g/cc (1600 kg/m3), contact the factory for accuracy specifications.

(3) Percentage of entrained gas range 0 to 100%.

(4) This is the maximum measurement offset due to process fluid temperature changing away from the density calibration

temperature.

(5) Pressure effect is defined as the change in sensor density sensitivity due to process pressure changing away from the

calibration pressure. To determine factory calibration pressure, refer to calibration document shipped with the 7845/47. If data is unavailable, contact the factory.

(4)

(5)

±0.00005 g/cc ±0.00278 g/cc

±0.000006 g/cc ±0.000041 g/cc

±0.05 kg/m ±2.7778 kg/m

±0.006 kg/m ±0.041 kg/m

(Entrained Gas Option)

(Per year)

(Per °C)

(Per 100 °F)

(Per bar) (Per 100 psi)

). For densities above this range and up to

(3)

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

B.2 Temperature specification

Operating Range

(1) –58 °F to 320 °F (–50 °C to +160 °C) with high temperature kit option.

(1)

–58 °F to +230 °F (–50 °C to +110 °C)

B.2.1 Integral temperature sensor

Technology 100 Ohms RTD (4 wire)

Accuracy BS 1904 Class, DIN 43760 Class A.

Installation & Configuration Manual 89

7845/7847 Specifications

B.3 Pressure ratings

Maximum operating pressure

7845 7847

1450 psi (100 bar) or flange limit 290 psi (20 bar) or flange limit

Test pressure Tested to 1.5 x the maximum operating pressure

PED compliance Complies with European directive 97/23/EC on Pressure Equipment.

B.4 Hazardous area classifications

ATEX Intrinsically Safe

ATEX-approved I.S. 7845/47: Certification to EN 60079-0: 2006 and EN 60079-11: 2007 for use in Europe

(1)

7845/47 (Frequency Output)

7845/47 (Transmitter)

(1)

Remote Display (Optional) ATEX II 1 G, Ex ia IIC, T4 (Ta –40°C...+60°C)

(1) Entrained gas 7845/7847 (Frequency Output) approved for use in non-hazardous areas only.

(784x****AJ****) ATEX II1G, Ex ia IIC

T6 (Ta –40 °C...+40 °C) T4 (Ta –40°C...+70°C)

(784x****(D/H)J****) (784x****(B/F)J****)

ATEX II1G, Ex ia IIB T4 (Ta –40°C...+60°C) ATEX II1G, Ex ia IIC T4 (Ta –40°C... +60°C)

CSA Intrinsically Safe

CSA-approved I.S. 7845/47: Certification to CSA C22-2 No 142, CSA C22-2 No 175, UL 508 and UL 913 for use in Canada/USA

(1)

7845/47 (Frequency Output)

7845/47 (Transmitter) and optional Remote Display

(1)

(784x****AL****) Class I, Division 1 Groups C & D, T3C

(784x****(B/F)L****) (784x****(D/H)L****)

Class I, Division 1, Groups A, B, C & D, T4 (Single instrument) Class I, Division 1, Groups C & D, T4 (Hart Multi-drop)

(1) Entrained gas 7845/7847 (Frequency Output) approved for use in non-hazardous areas only.

B.5 OIML R117-1 classifications (7845 Only)

Evaluation to OIML R117-1 Edition 2007 (E) and Measuring Instrument Directive (2004/22/EC) Annex MI-005

Viscosity range 0.75 cP to 50 cP (0.75 mPa

Density range 0.7 g/cc to 1.2 g/cc (700 kg/m

Temperature range ambient –40 °F to +158 °F (–40 °C to +70 °C)

Environmental class Mechanical: M2

Electromagnetic: E2

Maximum pressure Fluid temperature range Accuracy Class

• 870.2 psi (60 bar) • +41 °F to +95 °F (+5 °C to +35 °C) • 0.3

• 870.2 psi (60 bar) • –14 °F to +131 °F (–10 °C to +55 °C) • 1.0

·s to 50 mPa·s)

to 1200 kg/m3)

90 Micro Motion 7835/45/47 Liquid Density Meters

7845/7847 Specifications

B.6 General classifications

B.6.1 Electromagnetic compatibility

All versions conform to the latest international standards for EMC, and are certified compliant with:

• Emissions: EN 61326 – 1997 (Heavy Industrial Environment)

• Radiated emissions in the range 30 MHz to 100 MHz, and conducted emissions in the range

0.15 MHz to 30 MHz complying with standard EN 61000-4

• Immunity: BS EN 61000-6.2

B.7 Materials of construction

Wetted parts 316L Stainless steel

Case finish 316L Stainless steel

Flange 316L Stainless steel

B.8 Fluid containment

Recognizing the increased emphasis on safety by chemical, hydrocarbon, and process markets alike, these Micro Motion density meters have been enhanced by the introduction of an optional outer 725 psi (50 bar) or secondary 1450 psi (100 bar) pressure retaining capability. In the unlikely event of an instrument failure, the meter safely contains any leakage. As a further safety feature, all welds are qualified to ASME 9/BS/EN288 standards and can undergo dye penetration testing to ASME standards, if required. Furthermore, the flange welds may be x-rayed to most recognized international standards.

Standard Containment Optional Outer Containment

Design pressure 725 psi (50 bar)

Standard engineering practice

Yield pressure Fitted with burst disc which

will fail between 290–435 psi (20–30 bar)

1450 psi (100 bar) N/A

7835 Specifications Electrical Specifications7845/7847 SpecificationsGeneral Maintenance

Optional Second Containment (7845 only)

1450 psi (100 bar) designed to B31.3

Failure pressure 2900 psi (200 bar) 5727 psi (395 bar)

Glass to metal seal failure

Installation & Configuration Manual 91

B.9 Weight

Weight (7845/47): 48 lb (22 kg)

B.10 Electrical

Power supply (Frequency Output version) 16 to 28 VDC at 17 mA maximum

Power supply (Transmitter version) 18 to 28 VDC at 80 mA

Outputs (Frequency Output version) Current modulation on power supply line

Outputs (Transmitter version) Analog

Accuracy Repeatability Out-of-range

Pulse output (on Ex ia transmitter)

Communications (on Ex ia transmitter)

2 (+1 with HART option board)

0.1% of reading plus 0.5% of full scale ±0.025% 2 to 20 mA on 4–20 mA (Programmable alarm state) Open collector output. Alarm status or frequency.

RS-485, Modbus (standard), HART (optional).

92 Micro Motion 7835/45/47 Liquid Density Meters

Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Manuals & Guides

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

1.1 Safety guidelines

1.2 Product overview

1.3 Product range

1.4 Electronics product range

1.5 Advanced electronics

1.5.1 Baseboard

1.5.2 Option board

1.5.3 Remote display

1.6 2004/22/EC (MID) applications

Installation Procedure

2.1 General

2.2 Safety Information

2.2.1 General information applicable to the complete system

2.2.2 Pressure bearing parts

2.3 Installation planning

2.4 Meter mounting and pipework

2.5 Pressure drop in the meter

2.6 Calculation of pressure drop in the meter

2.7 Special considerations for hygienic applications (7847 meter only)

2.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier

2.9 Post-installation checks

2.10 Installation Drawings

Electrical Connections (Standard)

3.1 General

3.2 MID (2004/22/EC) Requirements

3.2.1 Securing the meter for MID

3.3 Ground connections

3.4 Use with Micro Motion signal converters

3.4.1 System Connections (Hazardous Area only)

3.4.2 System connections (Safe Area only)

3.5 Use with customer’s own equipment

3.5.1 System connections (Safe Area only)

3.5.2 System Connections (Hazardous Area only)

3.6 Post-installation checks

Electrical Connections (Advanced)

4.1 General

4.2 MID (2004/22/EC) Requirements (7835/7845 Only)

4.2.1 Securing the meter for MID

4.3 Planning an Electrical Installation

4.4.1 Electrical Installation with Signal Converter

4.5.1 Safety Barrier and Galvanic Isolator Selection

4.5.2 Electrical connections in a hazardous area

4.6 Baseboard Configuration

4.8 Advanced Density Post-Installation Checks

Electrical Connections (Entrained Gas Option)

5.1 General

5.2 Ground Connections

5.3 Use with Signal Converters

5.3.1 System Connections

5.4 Use with Customer’s Own Equipment

5.4.1 System Connections for Safe Areas

5.5 Post-Installation Checks

Calibration and Performance

6.1 General

6.1.1 For Standard Electronics Units

6.1.2 For Advanced Electronics Units

6.2 Interpretation of calibration certificate

6.2.1 General density equation

6.2.2 Temperature correction

6.2.3 Pressure correction

6.2.4 Velocity of sound correction

6.3 Calibration

6.3.1 Factory calibration

6.3.2 Calibration of transfer standards

6.3.3 Instrument calibration certificate

6.3.4 Pressure test

6.3.5 Insulation test

6.3.6 Calibration check methods

6.4 Performance

Remote Display and Digital Communications

7.1 Introduction

7.2 Mechanical Installation of the 7965 Remote Display

7.3 Safe Area Electrical installation

7.4 Hazardous Area Electrical installation

7.5 Configuring the Baseboard using the Remote Display