Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Owner's manual

Brand: Micro Motion

Model: Liquid Density Meters - Model 7835, 7845, 7847

Category: Carbon monoxide (CO) detectors

Type: Owner's manual

Installation & Configuration Manual

P/N MMI-20018786, Rev. AB

December 2011

Micro Motion 7835/45/47

Liquid Density Meters

Standard and Advanced Electronics

Motion, ELITE, ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Process Management family of

companies. All other marks are property of their respective owners.

Micro Motion pursues a policy of continuous development and product improvement. The specification in this document may

therefore be changed without notice. To the best of our knowledge, the information contained in this document is accurate and

Micro Motion cannot be held responsible for any errors, omissions, or other misinformation contained herein. No part of this

document may be photocopied or reproduced without prior written consent of Micro Motion.

Installation & Configuration Manual i

Contents

Chapter 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Safety guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.3 Product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.4 Electronics product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.5 Advanced electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.5.1 Baseboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5.2 Option board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5.3 Remote display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.6 2004/22/EC (MID) applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 2 Installation Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2.1 General information applicable to the complete system . . . . . . . . . . . . . . 7

2.2.2 Pressure bearing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Installation planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4 Meter mounting and pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.5 Pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.6 Calculation of pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.7 Special considerations for hygienic applications (7847 meter only) . . . . . . . . . . . . . 14

2.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier . . . . . . . . . . . . 14

2.9 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.10 Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chapter 3 Electrical Connections (Standard). . . . . . . . . . . . . . . . . . . . . . . . . 21

3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2 MID (2004/22/EC) Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3 Ground connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.4 Use with Micro Motion signal converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.4.1 System Connections (Hazardous Area only) . . . . . . . . . . . . . . . . . . . . . . 22

3.4.2 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.5 Use with customer’s own equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.5.1 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.5.2 System Connections (Hazardous Area only) . . . . . . . . . . . . . . . . . . . . . . 25

3.6 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Chapter 4 Electrical Connections (Advanced) . . . . . . . . . . . . . . . . . . . . . . . . 27

4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.2 MID (2004/22/EC) Requirements (7835/7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.3 Planning an Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.4 Electrical installation in safe areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

ii Micro Motion 7835/45/47 Liquid Density Meters

Contents

4.4.1 Electrical Installation with Signal Converter . . . . . . . . . . . . . . . . . . . . . . 31

4.5 Electrical installation in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.5.1 Safety Barrier and Galvanic Isolator Selection . . . . . . . . . . . . . . . . . . . . 32

4.5.2 Electrical connections in a hazardous area . . . . . . . . . . . . . . . . . . . . . . . 34

4.6 Baseboard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

4.7 Baseboard plus HART® Option Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.7.1 Electrical Installation for HART® Communications . . . . . . . . . . . . . . . . . 40

4.8 Advanced Density Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Chapter 5 Electrical Connections (Entrained Gas Option) . . . . . . . . . . . . . . . . 43

5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.2 Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3 Use with Signal Converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.1 System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.4 Use with Customer’s Own Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.4.1 System Connections for Safe Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.5 Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Chapter 6 Calibration and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.1.1 For Standard Electronics Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.1.2 For Advanced Electronics Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.2 Interpretation of calibration certificate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.2.1 General density equation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.2.2 Temperature correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.2.3 Pressure correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.2.4 Velocity of sound correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

6.3 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

6.3.1 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

6.3.2 Calibration of transfer standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

6.3.3 Instrument calibration certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.3.4 Pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.3.5 Insulation test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.3.6 Calibration check methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

6.4 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Chapter 7 Remote Display and Digital Communications. . . . . . . . . . . . . . . . . 59

7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

7.2 Mechanical Installation of the 7965 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . 59

7.3 Safe Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.4 Hazardous Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.5 Configuring the Baseboard using the Remote Display . . . . . . . . . . . . . . . . . . . . . . . 61

7.5.1 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

7.5.2 Slave address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

7.5.3 Demo mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

7.5.4 Navigating the menu structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

7.5.5 Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.6 Multi-drop installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.7 Electrical installation of Computer Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

7.7.1 Connections using an RS-232/485 Converter . . . . . . . . . . . . . . . . . . . . . 67

Installation & Configuration Manual iii

Contents

Chapter 8 Using ADView and ProLink II . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.1 Using ADView Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.1.1 What is ADView? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.1.2 Installing ADView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.1.3 Starting ADView. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

8.1.4 Understanding ADView Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

8.2 Using ProLink II Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.2 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.3 Connecting from a PC to a transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.4 ProLink II configuration upload/download . . . . . . . . . . . . . . . . . . . . . . . . 79

8.2.5 ProLink II language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Chapter 9 General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.2 Fault analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.3 General maintenance procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.4 Physical checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

9.4.1 Check calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

9.4.2 Remedial servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Appendix A 7835 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

A.1 Density performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

A.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

A.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

A.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

A.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

A.5 OIML R117-1 classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

A.6 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

A.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

A.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

A.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

A.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Appendix B 7845/7847 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

B.1 Density performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

B.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

B.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

B.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

B.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

B.5 OIML R117-1 classifications (7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

B.6 General classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

B.6.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

B.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

B.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

B.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

B.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Appendix C Electronics Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.1 Standard Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

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C.1.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.1.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.2 Standard Entrained Gas Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.2.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.2.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.3 Advanced Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.3.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

C.3.2 Analog Output (including HART

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

C.3.3 Tube Frequency/Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

C.3.4 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

C.3.5 Time Period Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

C.3.6 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

C.4 Environmental Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

C.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

C.4.2 IP rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Appendix D Calculations and Configurable Factors

(Advanced Electronics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

D.1 Baseboard configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

D.2 Baseboard diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

D.3 Meter calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

D.3.1 Base density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

D.3.2 Special function calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

D.3.3 Quartic equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Appendix E Calibration Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

E.1 Example calibration certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Appendix F Modbus Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

F.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

F.2 Outline of the Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

F.3 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

F.4 Modbus dialect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

F.4.1 Register size and content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

F.5 Establishing Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

F.6 Modbus commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

F.7 Modbus register assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

F.8 Index and enumeration codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

F.8.1 Meter type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

F.8.2 Density, temperature, and pressure units . . . . . . . . . . . . . . . . . . . . . . . 122

F.8.3 Special function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

F.8.4 Special function quartic equation name codes . . . . . . . . . . . . . . . . . . . 123

F.8.5 Special function quartic equation units codes . . . . . . . . . . . . . . . . . . . . 123

F.8.6 Averaging time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

F.8.7 Analog output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

F.8.8 User-defined alarm variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

F.8.9 Normal alarm states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

F.8.10 Alarm coverage codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

F.8.11 Alarm hysteresis codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

F.8.12 Software version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

F.8.13 Status register flags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Installation & Configuration Manual v

Contents

Appendix G HART

Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

G.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

G.2 HART® basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

G.2.1 Physical form of transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.2.2 Transaction protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.2.3 Message structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.2.4 Data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.2.5 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.3 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G.3.1 HART® conformance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

G.4 HART® Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

G.4.1 Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

G.4.2 Common Practice Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

G.5 Transmitter specific command structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

G.5.1 Command 128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

G.5.2 Command 129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

G.5.3 Table 1 - Identification codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

G.5.4 Table 2 - Limits and constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

G.5.5 Table 3 - Output / transmitter variable designations . . . . . . . . . . . . . . 134

G.5.6 Table 4 - Transmitter variable designations . . . . . . . . . . . . . . . . . . . . . 134

G.6 Summary of HART® functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

Appendix H Certified System Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

H.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Appendix I Return Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

I.1 General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

I.2 New and unused equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

I.3 Used equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

vi Micro Motion 7835/45/47 Liquid Density Meters

Contents

Installation & Configuration Manual 1

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

Chapter 1

Introduction

1.1 Safety guidelines

Handle the 7835/45/47 liquid density meter with great care.

• Do not drop the meter or subject it to severe mechanical shock.

• Do not expose the meter to excessive vibration.

• Ensure axial loading from pipework does not exceed 1/2 tonne.

• Ensure all electrical safety requirements are applied.

• Ensure the meter and associated pipework have been pressure tested to 1-1/2 times the

maximum operating pressure.

• Do not use liquids incompatible with the construction.

• Do not operate the meter above its rated pressure.

• Do not expose the meter to excessive vibration (> 0.5 g continuous).

• Ensure meter is not transported when it contains hazardous substances. This includes fluids

that may have leaked into, and are still contained, within the case.

• To return a meter, refer to Appendix I for more information on the Micro Motion return policy.

Safety messages are provided throughout this manual to protect personnel and equipment. Read each

safety message carefully before proceeding to the next step.

1.2 Product overview

All of the products consist of a mechanical meter and an electronics unit that is normally mounted

inside the meter electronics housing. Together, the electronics and meter provide a system for

continuous on-line measurement of liquid density and temperature.

In applications where the pipeline temperature could exceed 110 °C (230 °F), the electronics should

be mounted in a Remote Amplifier Box (see Chapter 3 and Chapter 4 for more details.)

2 Micro Motion 7835/45/47 Liquid Density Meters

Introduction

Figure 1-1. 7835/45/47 liquid density meter

Liquid density is determined from the resonant frequency of a vibrating tube containing the liquid,

and liquid temperature is determined from a 100-Ω RTD.

1.3 Product range

The meters are identical mechanically, except for the material used in the wetted parts and the

flanges/couplings. A fully welded design is utilized to ensure maximum reliability in the most severe

environments. A rupture disc is embodied in the meter end plate furthest from the amplifier housing.

This disc will rupture if a pressure build-up occurs within the case, in the unlikely event of a tube

assembly leak; the operation of the rupture disc is shown in Figure 2-2.

1.4 Electronics product range

The meters described above may be operated with any of the following electronics options. However,

the electronics options are not all directly interchangeable; this is because the Advanced electronics

boards are physically longer than the Standard electronics boards, and so only fit in the extended

electronics enclosures provided with an Advanced meter.

It should be noted that the Standard Entrained Gas Electronics are NOT suitable for operation in

hazardous areas, whereas all of the other electronics boards are suitable.

For further details of the performance of the different electronics boards, please refer to the

appropriate chapters.

Table 1-1. Meter product range

Meter Tube material Features

7835 NI-SPAN-C

Low temperature coefficient and long term stability, appropriate for fiscal

applications.

7845 316L Stainless

steel

Good resistance to corrosion.

7847 316L Stainless

steel

Designed for the hygiene requirements of the food processing industry and has

3A authorisation. Please refer to Section 2.7 for special cleaning and installation

requirements in hygienic applications.

Electronics Enclosure

Meter

transducers

Installation & Configuration Manual 3

Introduction

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

1.5 Advanced electronics

In contrast to a meter fitted with Standard electronics (which requires a Signal Converter for

operation), the meter with Advanced electronics will provide a complete measurement system.

An Advanced baseboard, plus meter, provides a complete system for measuring liquid density and

liquid temperature. A Remote Display or one of the optional boards may be required if outputs need

to be configured in the field or if additional functionality is required.

Table 1-2. Electronics product range

Standard Electronics

Density version

Basic amplifier circuit providing a frequency signal (indicating

liquid density) and RTD resistance (indicating liquid temperature).

Interfaces with a Signal Converter.

Entrained gas

version

Similar amplifier circuit to the above but meter operating at a lower

frequency which is more insensitive to entrained gas. It is NOT

suitable for operation in hazardous areas.

Advanced Electronics

Density version

Entrained gas

version

Microprocessor controlled circuit with a choice of analog and

digital outputs providing a direct measurement of density and

temperature. Also providing a selection of calculated parameters

and several diagnostic functions.

As above but meter operating at a lower frequency more

appropriate for liquids with entrained gas. Suitable for operation in

hazardous areas.

Remote Amplifier Box

Advanced

Electronics

Suitable for operation in hazardous areas.

784521A: IIB Approval (ATEX)

784522A: IIC Approval (ATEX)

784523A: CSA Approval

784524A: Non-classified (supplied as spare for customer

installation).

Note that the advanced electronics amplifier cannot be fitted into

the Standard electronics Remote Amplifier Box.

4 Micro Motion 7835/45/47 Liquid Density Meters

Introduction

Figure 1-2. Advanced electronics baseboard and remote display

For convenience, the Advanced system design and performance are outlined below.

1.5.1 Baseboard

The baseboard can be considered the heart of the system. Along with a liquid density meter, it

provides a complete system for measuring liquid density and liquid temperature. The baseboard

performs a range of useful calculations and provides the following outputs:

• Two fully configurable 4–20 mA outputs.

• One pulse output providing either an alarm status signal or the meter tube frequency.

• An RS-485 digital communications link using RTU Modbus protocol.

1.5.2 Option board

The option board fits directly onto the baseboard. One option board is presently available.

• HART

board – providing an additional 4–20 mA output and full HART communications.

Only one board may be fitted at a time.

1.5.3 Remote display

The 7965 remote display is intended for either handheld or wall-mounted use. It provides a

convenient means for displaying calculated data and for configuring or analyzing the system setup. It

communicates via the baseboard RS-485 digital communications link. One remote display can

communicate with a number of meters if they are connected together on the same RS-485 link.

1.6 2004/22/EC (MID) applications

Mobrey Limited, a division of Emerson Process Management, has evaluated the 7835 and 7845 liquid

density meters against OIML R117-1:2007 and WELMEC guide 8.8 for use in measuring systems for

the continuous and dynamic measurement of quantities of liquids other than water. This evaluation

was in compliance with the European Measuring Instrument directive (2004/22/EC) annex MI-005.

Baseboard

Option board

Remote Display

7965 DISPLAY

Installation & Configuration Manual 5

Introduction

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

You may use the evaluation certificate for the 7835 and 7845 liquid density meters, with written

permission of Mobrey Limited to assist in obtaining an EC-type examination certificate for the

complete measuring system.

6 Micro Motion 7835/45/47 Liquid Density Meters

Introduction

Installation & Configuration Manual 7

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

Chapter 2

Installation Procedure

2.1 General

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

2.2 Safety Information

2.2.1 General information applicable to the complete system

• These safety instructions are to be used whenever handling or operating this product. Suitably

trained personnel shall carry out the installation both mechanical and electrical in accordance

with the applicable local and national regulations and codes of practice for each discipline.

• Safe working practices for the media and process concerned must be followed during the

installation and maintenance of the equipment. Depressurize and isolate the system before

starting to loosen or remove any connection.

• If the equipment is likely to come into contact with aggressive substances, it is the

responsibility of the user to take suitable precautions that prevent it from being adversely

affected.

• It is the responsibility of the installer/user of this equipment to ensure:

• This product is not used as a support for other equipment or personnel.

• This product is protected from impact.

• It is important that this sensor is handled with care due to its weight and sensitivity to impact;

ensure lifting straps are fitted around flanged ends.

8 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

2.2.2 Pressure bearing parts

• It is the responsibility of the installer/user of this equipment to ensure:

• The materials of construction are suitable for the application.

• All piping connections conform to the local and national regulations and codes of practice.

• The pressure and temperature limits for this equipment are not exceeded, if necessary by

the use of suitable safety accessories. See Table 2-1.

• Correct gaskets/seals are fitted and are compatible with the media and process.

• The installed sensor is adequately supported for weight and vibration effects.

• Personnel are protected from hot burns by guards, thermal lagging or limited access.

Allow time to cool prior to carrying out maintenance operations. It is recommended that

“HOT” notices are fitted in the vicinity of the equipment where applicable.

• Regular inspection for corrosion and wear are carried out, both internal and external.

• The sensor must not be fitted until all installation work and final pre commissioning checks are

carried out. Do not remove blanking plugs until the sensor is fitted.

• The sensor must be installed in compliance with this manual, to ensure correct fitting. This

applies to all variants.

• The user should not repair this equipment, but general maintenance can be applied as

described within this manual.

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

Process

Flange fitting

Pressure Rating

20°C 110°C

Class 600 1440.2 psi (99.3 bar) 1203.8 psi (83.0 bar)

Class 900 2159.6 psi (148.9 bar) 1805.7 psi (124.5 bar)

PN40 580.2 psi (40.0 bar) 539.5 psi (37.2 bar)

PN100 1450.4 psi (100.0 bar) 1348.9 psi (93.0 bar)

Installation & Configuration Manual 9

Installation Procedure

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

2.3 Installation planning

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

2.4 Meter mounting and pipework

This section considers in more detail the mounting of the meters and the design of the associated

pipework, including the calculation of pressure drop in the meter.

The preferred methods of supporting the meter are shown in Figure 2-1.

Table 2-2. Installation considerations

Safety

When installing in a process line, it is important that the construction material of the wetted

parts (tube) is matched to the non-corrosive performance of the liquid passing through the

instrument. Failure to observe this requirement can cause deterioration of the central tube

(the bellows) and loss in measurement accuracy, or even a failure if leaking occurs. For

advice on which meter in the range is appropriate, please contact Micro Motion.

The NI-SPAN-C material of the central tube is not rated for ‘sour’ service as defined in

NACE specification MR0103-2005. For advice in this application, please contact

Micro Motion.

Serviceability

Installing the meter in a by-pass configuration allows it to be removed for servicing or

calibration without affecting the main pipeline. Possible by-pass configurations are shown in

Figure 2-3.

Performance

Pipe stresses and

vibration

Axial load should not exceed ½ tonne, so pipe-work should have a degree of flexibility.

Excessive pipe vibration should be avoided. Figure 2-2 for preferable mounting positions.

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

following points should be considered:

• The liquid must always be at a pressure substantially above its vapor pressure.

• All pipe-work couplings and joints must be airtight.

• No vortex should be present at the inlet to the meter.

• Cavitations, caused by pumping, should not generate bubbles from dissolved gases.

• If a pump is used it should ‘push’ rather than ‘pull’ the product through the meter.

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

be mounted vertically or at an incline, with the flow in an upwards direction.

• If the liquid contains solid particles, the direction of flow should be upwards unless the

particles are large enough not to be carried with the flow, in which case the direction of

flow should be reversed.

• The meter should be mounted with the electric cable running downwards thereby

minimizing the ingress of water should a cable gland become defective.

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

temperature equilibrium and have a self-cleaning action.

A low flow rate, for example 1000 liters/hour (3.7 gal/min.), is recommended if the product

contains particles which may cause erosion.

The meters exhibit a small flow dependent density reading. For flow rates up to 15000

liters/hour (55 gal/min) and assuming no consequent line pressure or product changes, the

maximum density offset will be less than 0.2 kg/m

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

temperature stabilisation.

10 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

Figure 2-1 Preferred methods of mounting meters (support)

For continuously high flow rates, the mounting position can be selected to simplify the associated

pipework and help minimize the pressure and temperature losses (see Figure 2-2).

1st

Meter supported

in two positions around

1” schedule 80 pipe.

Meter supported

in two positions around

outer case (4” diameter).

3rd

Meter supported

in two positions around

the immediate pipework.

2nd

Installation & Configuration Manual 11

Installation Procedure

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

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

1st

FLOW

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

12 Micro Motion 7835/45/47 Liquid Density Meters

Installation Procedure

Figure 2-3 Typical bypass pipeline configurations

‘S’ Bend Method

Pressure Bend Method

Pitot Tube Method

Laminar Flow Method

Orifice Plate Method

Direction of Flow

Pump Method

PUMP

Integral Cleaning System

CLEANING LIQUID

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Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Owner's manual

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Model: Liquid Density Meters - Model 7835, 7845, 7847

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Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Owner's manual

Micro Motion Liquid Density Meters - Model 7835, 7845, 7847 Owner's manual

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