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Emerson Process Management
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7951
User Manual
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Emerson Process Management 7951 User Manual

®
r
Operating Manual
HB511020, Rev. A November 2007
7951 Signal Converter
(With gas software 1020)
®
Micro Motion
7951
Micro Motion
7951 Signal Converte
Klippon Connector Model
Introduction
The Micro Motion used for dual-channel/stream gas applications.
Software Version
1020 – Gas Applications.
Models Covered
7951MAA0*****
:
®
7951 Signal Converter can be
:
:
D-Type Connector Model
Models Covered
7951MAB0*****
:
Copyright © 1997 - 2007
Micro Motion, Inc. pursues a policy of continuous development and product improvement. The information contained in this document is, therefore, subject to change without notice. To the best of our knowledge, the information contained in this document is accurate. However, Micro Motion cannot be held responsible for any errors, omissions or inaccuracies, or any losses incurred as result of them.
IMPORTANT NOTICE
Because we are continuously improving our products, some of the menus which appear on your instrument’s display may not be exactly as illustrated and described in this manual. However, because the menus are simple and intuitive, this should not cause any major problems.
This manual is concurrent with embedded software version 511020, issue 2.10
Static precautions
Some parts of the instrument (such as circuit boards) may be damaged by static electricity. Therefore, when carrying out any work which involves the risk of static damage to the instrument, the instructions show the following notice:
CAUTION
At such times you must wear an earthed wrist-strap to protect the instrument.
While carrying out this procedure, you must wear an earthed wrist strap at all times to protect the instrument against static shock.
Safety information
NOTE: This information applies only to those instruments which are mains-powered.
Electricity is dangerous and you risk injury or death if you do not disconnect the power supplies before carrying out some of the procedures given in this manual. Whenever there is such a hazard, the instructions show a notice similar to the following:
WARNING
You must heed any such warnings and make sure that, before you go any further:
x All power leads are un-powered. x All power leads are disconnected from the equipment which you are working on unless the
instructions tell you otherwise.
Electricity is dangerous and can kill. Disconnect all power supplies before proceeding.
x You obey any other common-sense precautions which may apply to your situation.
If you obey these sensible precautions, you can work on the equipment in complete safety.
Battery-backed Memory notice
x It is essential that the Lithium Cell used for the battery backup is installed at all times (other than during
replacement). The 7951 Micro Motion
If it is necessary to run the units without batteries for Intrinsic Safety reasons, then the battery should be replaced with a shorting disk inserted in the battery holder. Please consult the factory for further advice.
x Replace the battery when the "Low Battery" system alarm is indicated. The procedure is in Chapter 14.
®
Signal Converter will not power-up correctly if this battery is missing.
CONTENTS
1. About this manual 1.1
1.1 What this manual tells you 1.1
1.2 Who should use this manual 1.1
1.3 Software versions covered by this manual 1.1
2. Getting started 2.1
2.1 What this chapter tells you 2.1
2.2 What the examples show you 2.1
2.3 If you need help… 2.1
2.4 Example 1: 7951 with a 7810/11/12 Gas density transducer 2.2
2.5 Example 2: 7951 with a 3096 Gas specific gravity transducer 2.6
2.6 Example 3: 7951 with a mA-type temperature transmitter 2.9
2.7 Example 4: 7951 with a mA-type pressure transmitter 2.11
2.8 Example 5: 7951 with a PRT-type temperature transmitter 2.14
3. About the Micro Motion® 7951 3.1
3.1 Background 3.1
3.2 What the 7951 Dual Channel Gas Signal Converter does 3.1
3.3 Physical description of the 7951 3.2
3.4 Communications 3.2
3.5 Typical installations 3.3
3.6 Checking your software version 3.3
4. What you can connect to a 7951 4.1
The information in this chapter has been moved to Appendix C
5. Installing the system 5.1
5.1 What this chapter tells you 5.1
5.2 Hazardous and non-hazardous environments 5.1
5.3 Installation procedure 5.1
5.4 Step 1: Drawing up a wiring schedule 5.1
5.5 Step 2: Unpacking the instrument 5.2
5.6 Step 3: Setting DIP-switches 5.3
5.6.1 Analog input DIP-switches 5.3
5.6.2 Turbine voltage selection switch 5.3
5.7 Step 4: Fitting the 7951 5.4
5.8 Step 5: Making the external connections 5.6
5.9 Step 6: Earthing the instrument 5.6
5.10 Step 7: Connecting the power supply 5.8
6. The keyboard, display and indicators 6.1
6.1 What this chapter tells you 6.1
6.2 The layout of the front panel 6.1
6.3 What the display shows 6.2
6.4 How the buttons work 6.2
6.5 Using the buttons to move around the menus 6.2
6.6 Using the buttons to view stored data 6.3
6.7 Using the buttons to edit information 6.4
6.7.1 Text editing 6.4
6.7.2 Multiple-choice option selection 6.5
6.7.3 Numerical editing 6.5
6.7.4 Date and time editing 6.6
6.8 The 7951 character set 6.7
6.9 LED indicators 6.7
6.10 Summary of key functions 6.8
7. The menu system 7.1
7.1 What this chapter tells you 7.1
7.2 What the menu system does 7.1
7.3 How the menu system works 7.1
8. Alarms 8.1
8.1 Alarms 8.1
8.1.1 Alarm types 8.1
8.1.2 Alarm indicators 8.1
8.1.3 How alarms are received and stored 8.2
8.1.4 Examining the Alarm Status Display and Historical Alarm Log 8.2
8.1.5 What the Status Display tells you 8.3
8.1.6 What the entries in the Historical Log tell you 8.3
8.1.7 Clearing all alarms in the Historical Alarm Log 8.4
8.1.8 Alarm messages 8.4
9. Additional facilities 9.1
9.1 What this chapter tells you 9.1
9.2 Selecting units and data formats 9.1
9.3 Limits 9.1
9.4 Fallback values and modes 9.2
9.5 Analogue 0% and 100% values 9.2
9.6 Live and set data 9.2
9.7 Units which the 7951 can display 9.3
10. Configuring the instrument using wizards 10.1
10.1 What this chapter tells you 10.1
10.2 Wizards : Configuring the easy way 10.1
10.3 Wizard Maps : Conventions used 10.1
10.4 Quick-start Guide ( Set-up Wizards ) 10.3
10.5 Set-up wizard selection map 10.4
10.6 Units wizard selection map 10.5
10.7 Density 1 application wizard 10.7
10.8 Density 2 application wizard 10.8
10.9 SG-1 application wizard 10.9
10.10 SG-2 application wizard 10.11
10.11 SG-1&2 application wizard 10.12
10.12 Line density wizard 10.13
10.13 Base density wizard 10.16
10.14 Specific gravity wizard 10.18
10.15 Temperature wizard 10.20
10.16 Pressure wizard 10.22
10.17 Transmitter wizard 10.24
10.18 Special calculation wizard 10.27
10.19 Analogue outputs wizard 10.28
10.20 Alarms wizard 10.29
10.21 Multi-view wizard 10.30
10.22 Full setup wizard 10.31
11. Configuring the 7951 using the menus 11.1
11.1 What does configuration involve? 11.1
11.2 Before you start 11.1
11.3 Recommended sequence for configuration 11.2
11.4 What Sections 11.5 - 11.18 tell you 11.3
11.5 Configuring analogue inputs 11.5
11.6 Configuring transducer details 11.5
11.7 Configuring transmitter detail 11.6
11.8 Configuring flowmeter detail* 11.10
11.9 Configuring flow rate* 11.14
11.10 Configuring totalisers* 11.16
11.11 Configuring line density 11.18
11.12 Configuring base density 11.23
11.13 Configuring specific gravity 11.26
11.14 Configuring energy 11.29
11.15 Configuring custom applications 11.31
11.16 Configuring mA outputs 11.32
11.17 Configuring other parameters 11.33
11.18 Configuring Multiview 11.37
12. Routine operation 12.1
12.1 What this chapter tells you 12.1
12.2 The menu diagrams 12.1
12.3 Security and passwords 12.8
12.4 How you can edit displayed information 12.8
12.5 Making data values Live or Set 12.10
12.6 Changing the units which are displayed 12.11
12.7 Changing fallback values 12.11
12.8 Changing the time and date 12.11
12.9 Checking the performance of the 7951 12.11
12.10 Giving your 7951 a unique identifier 12.12
12.11 Printed reports 12.12
13. Routine maintenance and fault-finding 13.1
13.1 Cleaning the instrument 13.1
13.2 Fault-finding 13.1
14. Removal and replacement of parts 14.1
14.1 Front panel assembly 14.1
14.2 Display 14.1
14.3 Switch panel 14.2
14.4 Processor board 14.2
14.5 Power supply board 14.3
14.6 Connector Board 14.3
14.7 Fuse 14.3
14.8 Back-up battery 14.4
14.9 Rear Panel Assembly 14.5
14.10 Mother Board 14.6
15. Assembly drawing and parts list 15.1
15.1 What the drawing and parts list tells you 15.1
15.2 How to obtain spare parts 15.1
Appendices
Appendix A Glossary A.1
Appendix B Blank wiring schedule B.1
Appendix C Technical data for the 7951 C.1
Appendix D Units and conversion factors D.1
Appendix E Data tables E.1
Appendix F Calculations and theory F.1
1. About this manual
1.1 What this manual tells you
This manual tells you how to install, configure, operate, and service the instrument. In addition, some information is given to help you identify and correct some of the more common faults which may occur. However, since repairs are done by changing suspected faulty assemblies, fault-finding to board component level is not covered.
This manual assumes that all devices or peripherals to be connected to the 795x have their own documentation which tells you how to install and configure them. For this reason it is assumed that anything which you want to link to the 795x is already installed and working correctly in accordance with the manufacturer’s instructions.
Since the instrument can be used for a wide variety of purposes, it is driven by software specially for your application. This manual gives information about the software which applies to your machine only.
Throughout this manual the term '795x' is used to refer to all members of the 795x family (7950 and 7951).
1.2 Who should use this manual
Chapter 1 About this manual
This manual is for anyone who installs, uses, services or repairs the 795x.
1.3 Software version covered by this manual
The software version dealt with in this manual is given on the title page. Chapter 3 tells you about the software is installed in your instrument.
Page 1.1
Chapter 1 About this manual
Page 1.2
2. Getting started
2.1 What this chapter tells you
If you are new to the Micro Motion® 7951 Signal Converter, the worked examples in this chapter can help you to become familiar with the installation and configuration procedures. The examples are:
x Example 1: 7951 with a 7810/11/12 (See page 2.2)
x Example 2: 7951 with a 3096/3098 Gas Specific Gravity (See page 2.6)
x Example 3: 7951 with a mA-type temperature transmitter (See page 2.9)
x Example 4: 7951 with a mA-type pressure transmitter (See page 2.12)
x Example 5: 7951 with a PRT-type temperature transmitter (See page 2.14)
Work through whichever one is most like your installation.
2.2 What the examples show you
Chapter 2 Getting started
Each example shows you how to:
x wire up a simple system x set the DIP switches inside the 7951 x find the menu from which you start configuration x clear the memory of details of any existing configuration (OPTIONAL) x select the appropriate wizard to configure the simple system x work through the wizard and button in information x view the results of your configuration
The examples do not give full instructions on how to fit and configure installations. They are intended purely to give you confidence to install and configure your own equipment. Chapter 5 tells you how to make permanent installations.
2.3 If you need help...
If you get into difficulties...
If you get into difficulties when using the wizards, you can abandon the configuration and start again as follows:
1. From the menu, keep selecting NO (usually by pressing the c-button) or, if that option is not available:
2. Press ENTER until you can start selecting NO.
3. Carry on with (1) and (2) until you return to the wizards menu where you started.
4. Start the worked example again. The configuration you abandoned is cleared from the instrument’s
memory when you begin again.
If you don’t know where the buttons are...
Chapter 6 shows how to find all the buttons referred to in the worked examples.
Page 2.1
Chapter 2 Getting started
2.4 Example 1: 7951 with a 7810/11/12 gas density meter
About this example
†
This NON-HAZARDOUS (SAFE) AREA ONLY INSTALLATION 7811 or 7812 gas density meter to the 7951, and then uses the “Density 1” wizard to configure the system.
In this example, the “Density 1” wizard is used to configure a connection as follows:
x A single densitometer is connected to Density Input 1.
Work through the example by following the instructions below. If you are not sure where the buttons are, refer to Chapter 6.
example shows you how to connect either a 7810,
Connect the meter
1. Wire the meter to the 7951, as in:
Figure 2.1 for a 7810 or a 7811 gas density meter OR
Figure 2.2 for a 7812 gas density meter.
Note: Refer to meter documentation for other wiring arrangements.
2. Earth the 7951 to a suitable earth point.
EMC Notes:
To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the Flow Computer be connected to transducers using a suitable instrumentation cable containing individually shielded twisted pairs and an overall screen to cover all cores.
The instrumentation cables should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, and depending on the earthing scheme employed at the installation, the overall screen should be connected to the earthed metal work at both ends (360° bonding where possible). This may have multiple protective earth connections to the pipe work or the building structure and not connected to the individual screen(s) or Instrumentation or Zener barrier grounds.
The individual inner screen(s) should be connected at one end only, normally the controller (e.g. Flow Computer) end. These should be connected to the Instrumentation or Zener barrier ground.
Use suitable cables that meet BS5308 multi-pair Instrumentation Types 1 or 2.
7810/11
7951
Klippon D-type
POS
SIG
NEG
PL5/9
PL5/1
PL5/2
PL5/10
SK6/22
SK6/14
SK6/15
SK6/24
Figure 2.1: Safe area wiring for a 7810/11 (3-wire arrangement)
†
Hazardous area considerations: Refer to meter documentation for details of Intrinsically Safe Barrier/Isolator requirements.
Page 2.2
Chapter 2 Getting started
Turn on the power
Go to the wizards menu
Clear existing configuration
(This is optional)
7812
7951
Klippon D-type
+24V Power
Signal +
0V
Power
Signal -
PL5/9
PL5/1
PL5/10
PL5/2
SK6/22
SK6/14
SK6/24
SK6/15
SIG A
SIG B
1
2
3
4
Figure 2.2: Safe area wiring for a 7812 (3-wire arrangement)
3. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear.
4. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
5. Press the DOWN-ARROW button twice (to go to page 3 of the menu).
6. Press the b-button to select “Configure”.
7. Press the a-button twice to go to the wizards menu.
8. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the option list until “Initialise” is shown.
9. Press the b-button to select “Initialise”.
10. Press the d-button to confirm that you want to lose the current configuration.
11. Wait a few seconds until “initialise” on line 2 of the display changes back to
“Choose option”.
Select the wizard 12. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through
the option list until “Density 1” is shown.
13. Press the b-button to select “Density 1”.
Start of wizard 14. Press the d-button to answer YES to “Edit Gas density A?”
Enter densitometer calibration factors
15. Press the b-button, and then input the factor K0 from the Calibration Certificate that
was shipped with the meter.
16. Press the b-button then ENTER to confirm the K0 value.
17. Enter values for factors K1 and K2 in the same way as for K0.
Note: Figure 2.4 on page 2.4 shows where to find the K0, K1 and K2 factors on a calibration certificate. Always
use values from the calibration certificate that was
shipped with the connected meter.
18. Press b-button to start the correction selection process.
Enter temperature correction factors
Skip over the next few
19. Use the UP-ARROW button to scroll through the options until “Temp” appears on line 2.
20. Press the b-button and then the ENTER button to confirm that temperature correction is
to be applied.
21. Enter factors K18 and K19 in the same way as for K0, K1 and K2.
22. Press the ENTER button to skip past the “Density offset” prompt
23. Keep pressing the c-button (to answer NO to all questions) until the wizard is exited.
questions
View how you have configured Line density
24. Press the MENU button.
25. Press the a-button twice. The display looks similar to that shown in Figure 2.3,
although values and titles shown may vary.
Page 2.3
Chapter 2 Getting started
Figure 2.3: Prime Line density display
C A L I B R A T I O N C E R T I F I C A T E
7812xx GAS DENSITY METER
PRESSURE TESTED TO 375 BAR
DENSITY CALIBRATION FOR NITRIGEN AT 20 DEG C
Based on Pressure-Temperature-Density Data in IUPAC Tables
DENSITY
[ kg/m2]
0 1 2
5 10 15 20 30 40 50 60 70 80 90
TEMPERATURE COEFFICIENT DATA
Dt = DI ( 1 + K18 ( t - 20 ) ) + K19 ( t - 20 ) K18 = -1.36E-05
USER GAS OFFSET DATA
Nitrogen/Methane Gas Mixture Over Density Range 10 to 60 KG/M3
PERIODIC TIME
[us]
502.190
504.507
506.697
513.168
523.735
534.078
544.202
563.880
582.895
601.307
619.124
636.442
653.310
669.758
O N
Serial No:
Cylinder No:
Amplifier No:
Calibration Date:
L E
DENSITY = K0 +K1.T + K2.T**2
K0 = -1.104252E+02 K1 = -1.882012E-02 K2 = 4.749797E+04
P
L Y
K19 = 8.44E-04
123456
123456 123456
14JUL97
Page 2.4
( K3 ( G ) ) K3 = 354
DA = Dt ( 1 + ----------- ( 0.00236 - ----------- ) ) K4 = 57.4
( (Dt+K4) ( t+273 ) )
where
FO R EXAM
= Periodic Time (uS)
T
= Actual Density (KG/M3)
DA
= Temperature (DEG. C)
t
= Indicated Density (KG/M3)
DI
= Temp. Corrected Density (KG/M3)
Dt
Ref No: GD04/V1.5
Gas Specific Gravity
G = -------------------------------
Ratio of Specific Heats
FINAL TEST &
INSPECTION
DATE14JUL97
Figure 2.4: Circled areas on an example calibration certificate showing where to find
values for K0, K1, K2, K18 and K19.
Chapter 2 Getting started
View the Multi­view display
26. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure
2.5, although values shown may vary.
27. Pressing the DOWN-ARROW button results in the message:
“Invalid Multiview Page”
This appears because it is possible to have more than one Multiview page and it is simply saying that no more pages exist. In this case, only four items are defined and they fit on one page.
Pressing the UP-ARROW button makes the previous page to re-appear.
Note that it may be necessary to press the UP-ARROW button several times before the first Multi-view page appears.
From Multi-view key
a
b
c
d
a
b
c
d
V
V
Density 0.000
Invalid Multiview Page
End of Worked Example 1
Figure 2.5: Multi-view display
Page 2.5
Chapter 2 Getting started
2.5 Example 2: 7951 with a 3096/3098 Gas Specific Gravity Meter
About this example
This example shows you how to connect a 3096/3098 to the 7951 and then use the “SG 1” wizard to configure the system.
In this example, the “SG 1” wizard is used to configure a connection as follows:
x A single 3096/3098 is connected to Density Input 3.
Work through the example by following the instructions below. If you are not sure where the buttons are, refer to Chapter 6.
Connect the meter
1. Wire the meter to the 7951, as in :
Figure 2.6 for a NON-HAZARDOUS (SAFE) AREA OR
Figure 2.7 for a HAZARDOUS AREA
2. Earth the 7951 to a suitable earth point.
EMC Notes:
To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the Flow Computer be connected to transducers using a suitable instrumentation cable containing individually shielded twisted pairs and an overall screen to cover all cores.
The instrumentation cables should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, and depending on the earthing scheme employed at the installation, the overall screen should be connected to the earthed metal work at both ends (360° bonding where possible). This may have multiple protective earth connections to the pipe work or the building structure and not connected to the individual screen(s) or Instrumentation or Zener barrier grounds.
The individual inner screen(s) should be connected at one end only, normally the controller (e.g. Flow Computer) end. These should be connected to the Instrumentation or Zener barrier ground.
Use suitable cables that meet BS5308 multi-pair Instrumentation Types 1 or 2.
79513096/3098
Page 2.6
Klippon D-type
40 ohms
1
3
2
4
+
Sig
Neg
(24V) Power +
Signal +
Signal -
(0V) Power -
PL5/9
PL5/5
PL5/6
PL5/10
SK6/22
SK6/18
SK6/19
SK6/24
Figure 2.6: Non-hazardous (Safe) area wiring for a 3096/3098
3096/3098
Barrier as defined in the
latest 3096/3098
specification
Chapter 2 Getting started
7951
Klippon D-type
1
2
3
Turn on the power
Go to the wizards menu
Clear existing configuration
(This is optional)
+
Sig
Neg
3
4
Intrinsically Safe Earth
1
2
(24v) Power +
Signal +
Signal -
(0v) Power -
PL5/9
PL5/5
PL5/6
PL5/10
SK6/22
SK6/18
SK6/19
SK6/24
Figure 2.7: Hazardous area wiring for a 3096/3098
3. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear.
4. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
5. Press the DOWN-ARROW button twice (to go to page 3 of the menu).
6. Press the b-button to select “Configure”.
7. Press the a-button twice to go to the wizards menu.
8. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Initialise” is shown.
9. Press the b-button to select “Initialise”.
10. Press the d-button to confirm that you want to lose the current configuration.
11. Wait a few seconds until “initialise” on line 2 of the display changes back to
“Choose option”.
Select the wizard
12. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through
the option list until “SG 1” is shown.
13. Press the b-button to select “SG 1”.
Start of wizard 14. Press the d-button to answer YES to the question “Edit Gravitometer A?”.
Enter gravitometer calibration factors
15. Press the b-button, then input the factor K2 from the Calibration Certificate that was
shipped with the meter.
16. Press the b-button then ENTER to confirm the K2 value.
17. Press the b-button, then input the factor K0 from the Calibration Certificate that was
shipped with the meter.
18. Press the b-button then ENTER to confirm the K0 value.
Skip over other questions
View how you have configured Specific gravity
19. Press the c-button several times (to answer NO to all questions) until the wizard is
exited.
20. Press the MENU button.
21. Press the c-button and then press the a-button. The display looks similar to that shown in Figure 2.8 although values shown may vary.
Page 2.7
Chapter 2 Getting started
Figure 2.8: Prime Specific Gravity display
View the Multiview
22. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.9, although values and titles shown may vary.
display
End of Worked Example 2
From Multi-view key
a
b
c
d
a
b
c
d
V
V
Density 0.000
Invalid Multiview Page
Figure 2.9: Multi-View display
Page 2.8
Chapter 2 Getting started
2.6 Example 3: 7951 with a mA-type temperature transmitter
About this example
This example shows you how to connect a mA-type temperature transmitter to the 7951, and then use the “Temperature” wizard to configure the system.
In this example, the “Temperature” wizard is used to configure connections as follows:
x A single temperature transmitter is connected to Analogue Input 3.
Now work through the example by following the instructions below. If you are not sure where the buttons are, refer to the diagram at the start of this chapter.
Connect the meter
1. Wire the temperature transmitter to the 7951, as in Figure 2.10
2. Earth the 7951 to a suitable earth point.
EMC Notes:
To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the Flow Computer be connected to transducers using a suitable instrumentation cable containing individually shielded twisted pairs and an overall screen to cover all cores.
The instrumentation cables should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, and depending on the earthing scheme employed at the installation, the overall screen should be connected to the earthed metal work at both ends (360° bonding where possible). This may have multiple protective earth connections to the pipe work or the building structure and not connected to the individual screen(s) or Instrumentation or Zener barrier grounds.
The individual inner screen(s) should be connected at one end only, normally the controller (e.g. Flow Computer) end. These should be connected to the Instrumentation or Zener barrier ground.
Use suitable cables that meet BS5308 multi-pair Instrumentation Types 1 or 2.
Set DIP switch 3. Ensure that the DIP-switch, inside the 7951, is set as shown below.
Loop-powered
4-20mA
temperature
transmitter
7951
Klippon D-type
+
-
Power +
Signal +
Signal -
Power -
4-20mA
PL9/5
PL8/2
PL8/3
PL9/8
SK8/24
SK8/2
SK8/3
SK8/25
4
3
2
1
D
C
PRT
B
A
Notes:
1. Specified 7951 pins are for Analogue Input 3.
2. DIP-switch position 3 must be set to 4-20mA.
Figure 2.10: DIP-switch and safe area wiring for a mA-type temperature transmitter
Page 2.9
Chapter 2 Getting started
Turn on the power
Go to the wizards menu
Clear existing configuration
(This is optional)
Select the wizard
Start of wizard 15. Press the d-button to answer YES to the question “Edit Line Temperature?”.
Choose the Analogue Input
4. Turn on the power to the system. The system goes through a Power On Self Test (POST)
routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear.
5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
6. Press the DOWN-ARROW button twice to go to Page 3 of the menu.
7. Press the b-button to select “Configure”.
8. Press the a-button twice to go to the wizards menu.
9. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Initialise” is shown.
10. Press the b-button to select “Initialise”.
11. Press the d-button to confirm that you want to lose the current configuration.
12. Wait a few seconds until “initialise” on line 2 of the display changes back to “Choose option”.
13. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Temperature” is shown.
14. Press the b-button to select “Temperature”.
16. Press the b-button
17. Press the UP-ARROW button until “Analogue input 3” appears.
18. Press the b-button and then the ENTER button to confirm selection of
“Analogue input 3”.
Select the type of Analogue Input
Set Analogue 0% and 100% range
Make the Analogue Input “live”
Skip over the next few questions
View how you have configured Line temperature
19. Press the ENTER button to keep the default selection of a 4-20mA type input.
20. Press the b-button.
21. Type in a suitable maximum temperature value and then press the ENTER button.
22. Press the ENTER button to move on to the next prompt.
23. Press the b-button.
24. Type in a suitable minimum temperature value and then press the ENTER button.
25 Press the ENTER button to move on to the next prompt.
26. Press the d-button.
27. Press the UP-ARROW button so that “Set” changed “Live”.
28. Press the ENTER button once.
29. Press the c-button several times to answer NO to all questions until the wizard is exited.
30. Press the MENU button.
31. Press the d-button and then press the a-button. The display looks similar to that shown in Figure 2.11 although values shown may vary.
Page 2.10
Figure 2.11: Line temperature data display
End of Worked Example 3
Chapter 2 Getting started
Page 2.11
Chapter 2 Getting started
2.7 Example 4: 7951 with a mA-type pressure transmitter
About this example
This example shows you how to connect a mA-type pressure transmitter to the 7951, and then use the “Pressure” wizard to configure the system.
In this example, the “Pressure” wizard is used to configure a connection as follows:
x A single pressure transmitter is connected to Analogue Input 3.
Work through the example by following the instructions below. If you are not sure where the buttons are, refer to Chapter 6.
Connect the meter
1. Wire the transmitter to the 7951, as in Figure 2.12.
2. Earth the 7951 to a suitable earth point.
EMC Notes:
To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the Flow Computer be connected to transducers using a suitable instrumentation cable containing individually shielded twisted pairs and an overall screen to cover all cores.
The instrumentation cables should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, and depending on the earthing scheme employed at the installation, the overall screen should be connected to the earthed metal work at both ends (360° bonding where possible). This may have multiple protective earth connections to the pipe work or the building structure and not connected to the individual screen(s) or Instrumentation or Zener barrier grounds.
The individual inner screen(s) should be connected at one end only, normally the controller (e.g. Flow Computer) end. These should be connected to the Instrumentation or Zener barrier ground.
Use suitable cables that meet BS5308 multi-pair Instrumentation Types 1 or 2.
Set DIP switch 3. Ensure that the DIP-switch, inside the 7951, is set as shown in Figure 2.12 .
Loop-powered
7951
4-20mA pressure
transmitter
+
Power +
Signal +
-
Signal -
Power -
Klippon D-type
PL9/5
PL8/2
PL8/3
PL9/8
SK8/24
SK8/2
SK8/3
SK8/25
Page 2.12
D
C
PRT
B
A
4-20mA
4
3
2
1
Notes:
1. Specified 7951 pins are for Analogue Input 3.
2. DIP-switch position 3 must be set to 4-20mA.
Figure 2.12: DIP-switch and safe area wiring for a mA-type pressure transmitter
Chapter 2 Getting started
Turn on the power
Go to the wizards menu
Clear existing configuration
(This is optional)
Select the wizard 13. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
Start of wizard 15. Press the d-button to answer YES to the question “Edit Line Pressure?”.
Choose the Analogue Input
Set Analogue 0% and 100% range
4. Turn on the power to the system. The system goes through a Power On Self Test (POST)
routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear.
5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
6. Press the DOWN-ARROW button twice to go to Page 3 of the menu.
7. Press the b-button to select “Configure”.
8. Press the a-button twice to go to the wizards menu.
9. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Initialise” is shown.
10. Press the b-button to select “Initialise”.
11. Press the d-button to confirm that you want to lose the current configuration.
12. Wait a few seconds until “initialise” on line 2 of the display changes back to
“Choose option”.
option list until “Pressure” is shown.
14. Press the b-button to select “Pressure”.
16. Press the b-button
17. Press the UP-ARROW button until “mA input 3” appears.
18. Press the b-button and then the ENTER button to confirm selection of “mA input 3”.
19. Press the b-button.
20. Type in a suitable maximum pressure value and then press the ENTER button.
21. Press the ENTER button to move on to the next prompt
22. Press the b-button
23. Type in a suitable minimum pressure value and then press the ENTER button.
24 Press the ENTER button to move on to the next prompt
Select the type of Analog Input
Make the Analogue Input “live”
Skip over other questions
View how you have configured Line pressure
25. Press the ENTER button to keep the default selection of a 4-20mA type input.
26. Press the d-button
27. Press the UP-ARROW button so that “Set” changed “Live”
28. Press the ENTER button twice
29. Press the c-button several times to answer NO to all questions until the wizard is exited
30. Press the MENU button.
31. Press the DOWN-ARROW button.
32. Press the a-button twice. The display looks similar to that shown in Figure 2.13 although values shown may vary.
Figure 2.13: Line pressure data display
End of Worked Example 4
Page 2.13
Chapter 2 Getting started
2.8 Example 5: 7951 with a PRT-type temperature transmitter
About this example
This example shows you how to connect a PT100 transmitter to the 7951, and then use the “Temperature” wizard to configure the system.
In this example, the “Temperature” wizard is used to configure a connection as follows:
x A single PT100 transmitter is connected to Analogue Input 1.
Work through the example by following the instructions below. If you are not sure where the buttons are, refer to Chapter 6.
Connect the meter
1. Wire the transmitter to the 7951, as in Figure 2.14.
2. Earth the 7951 to a suitable earth point.
EMC Notes:
To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the Flow Computer be connected to transducers using a suitable instrumentation cable containing individually shielded twisted pairs and an overall screen to cover all cores.
The instrumentation cables should have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores. Where permissible, and depending on the earthing scheme employed at the installation, the overall screen should be connected to the earthed metal work at both ends (360° bonding where possible). This may have multiple protective earth connections to the pipe work or the building structure and not connected to the individual screen(s) or Instrumentation or Zener barrier grounds.
The individual inner screen(s) should be connected at one end only, normally the controller (e.g. Flow Computer) end. These should be connected to the Instrumentation or Zener barrier ground.
Use suitable cables that meet BS5308 multi-pair Instrumentation Types 1 or 2.
Set DIP switch 3. Set DIP-switch position 1 to “PRT” (for Analogue input 1).
PT100 on Analogue
Input 1
7951
Klippon D-type
PRT
Power +
Signal +
Signal -
Power -
PL7/1
PL7/2
PL7/3
PL7/4
SK7/14
SK7/15
SK7/16
SK7/17
Page 2.14
D
C
PRT
B
A
4-20mA
4
3
2
1
Notes:
1. Specified 7951 pins are for Analogue Input 1.
2. DIP-switch position 1 must be set to PRT.
Figure 2.14: DIP switch and safe area wiring for a PRT-type temperature transmitter
Chapter 2 Getting started
Turn on the power
Go to the wizards menu
Clear existing configuration
(This is optional)
Select the wizard 13. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through
Start of wizard 15. Press the d-button to answer YES to the question “Edit Line Temperature?”.
Choose the Analogue Input
4. Turn on the power to the system. The system goes through a Power On Self Test
(POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear.
5. Press the MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
6. Press the DOWN-ARROW button twice to go to Page 3 of the menu.
7. Press the b-button to select “Configure”.
8. Press the a-button twice to go to the wizards menu.
9. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Initialise” is shown.
10. Press the b-button to select “Initialise”.
11. Press the d-button to confirm that you want to lose the current configuration.
12. Wait a few seconds until “initialise” on line 2 of the display changes back to
“Choose option”.
the option list until “Temperature” is shown.
14. Press the b-button to select “Temperature”.
16. Press the b-button.
17. Press the UP-ARROW button until “Analogue input 1” appears.
18. Press the b-button and then the ENTER button to confirm selection of “Analogue input 1”.
Choose the type of Analogue Input
Make the Analogue Input Channel “live”
Skip over other questions
View how you have configured Line temperature
19. Press the b-button.
20. Press the UP-ARROW button until “PT100 input” appears on line 2.
21. Press the ENTER button twice to select this PRT-type input.
22. Press the d-button.
23. Press the UP-ARROW button so that “Set” has changed to “Live”.
24. Press the ENTER button twice.
25. Press the c-button several times (to answer NO to all further questions) until the wizard is exited.
26. Press the MENU button.
27. Press the d-button and then press the a-button. The display looks similar to that shown in Figure 2.15 although values shown may vary.
Figure 2.15: Line temperature display
End of Worked Example 5
Page 2.15
Chapter 2 Getting started
Page 2.16
3. About the Micro Motion® 7951
√
√
√
√
3.1 Background
The Micro Motion® 7951 is designed to meet the demand for a reliable, versatile, user-friendly and cost-effective instrument for liquid and gas metering. It has a Motorola 68332 32-bit microprocessor and surface-mounted circuit board components so that it is powerful, reliable and compact.
Features of the 7951 include:
• Simple access to information.
• Comprehensive interrogation facilities.
• Alarm and alarm history facilities.
• A menu-driven, user-friendly interface.
• NEMA12, IP52 panel mounted case.
• Dc powered.
• Three serial ports (using RS232 or RS485) for
Modbus communications and printing.
Chapter 3 About the Micro Motion® 7951
These facilities are described in more detail in the rest of this chapter.
3.2 What the 7951 Dual Channel Gas Signal Converter does
The 7951 Gas Signal Converter is primarily used to convert signals from one format to another. There is a need for this conversion when a system is unable to accept a raw signal from a transducer or, perhaps, some intermediate signal processing is required.
A common conversion is where a frequency input from a 7812 gas density transducer can be accepted by a 795x and then transmitted (by the same 795x) through an analogue output as a 4-20mA signal.
In this application, the 7951 can calculate:
• Line density
• Specific gravity
• Base density
• Energy (Cv/m) (from AGA-5 method or mA-type input)
Note: Dual-channel measurements are available for Items marked with a
It can also obtain:
• Line temperature.
• Densitometer temperature.
• Density pressure.
• Atmospheric pressure.
• Percentage of CO
• Percentage of N
• Compressibility (from S-GERG, NX19, NX19mod or NX19 3h)
• Special equations 1 and 2.
(from Transducer, PTZ method or mA-type input)
(from Transducer, mA-type input or Base density)
(from Specific gravity method, PTZ method or mA-type input)
(from a mA-type input)
2
(from a mA-type input)
2
Page 3.1
Chapter 3 About the Micro Motion® 7951
3.3 Physical description of the 7951
The main body of the 7951 is a one-piece aluminium extrusion which provides the best possible EMC protection. The keyboard and display is attached to the front of the instrument and all electrical and communications connectors are mounted on the Rear Panel. The 7951 is available with two types of rear Panel - one with Klippon connectors, the other with D-type connectors.
The case contains four circuit boards. The Processor Board and the Power Supply Board are mounted horizontally. These are connected by plugs and sockets to the Mother Board which is mounted vertically at the back of the case. The Connector Board is parallel to the Mother Board to which it is joined.
The Keyboard and Display are wired to the Processor Board. The Connector Board holds the connectors to which external devices are linked.
Processor
Power Supply Board
Board
Two types of Rear Panel
Either... Klippon connectors
SK1
SK2
SK3
PL3 PL4 PL5 PL6 PL7 PL8 PL9
PL2
PL1
Figure 3.1: The 7951 and its major assemblies
3.4 Communications
The 7951 can operate as a MODBUS slave. It can:
• Download a configuration from a PC, DCS, etc.
• Upload a configuration.
• Monitor random locations in the 7951.
• Interrogate the alarm and data logger buffers.
• Manipulate the alarm and data logger buffers.
• Set random locations with new data.
• Instigate printed reports.
Mother Board
Connector Board
Keyboard and display
D-type connectors
Or...
SK1
SK2
SK3
PL1
SK4 SK5 SK6 SK7 SK8
Page 3.2
3.5 Typical installations
p
The diagram below illustrates a typical installation utilising the 7951.
Part of pipeline
Chapter 3 About the Micro Motion® 7951
PT
DT
TE
4-wire PRT
Transducers and transmitters
Static pressure transducer
PT
DT
Density transmitter
Temperature element (PRT)
TE
7951
Frequency
4-20mA
MODBUS communications to and from host com
Figure 3.2: Typical installation for A Gas Signal Converter system
uter
Alarm
Analogue outputs
Printer
3.6 Checking your software version
The 7951 is driven by pre-loaded software which differs according to the application for which the instrument is to be used. To check hardware configuration, see Ordering Information in Appendix C.
PREFIX:
HARDWARE PLATFORM
50 7950 51 7951
DIGIT 1:
METERED PRODUCT
1 GAS 2 LIQUID 3 BOTH 4 OTHER
PREFIX DIGIT 1 DIGIT 2 DIGIT 3 DIGIT 4
SOFTWARE VERSION NUMBER
Figure 3.3: Software version number
DIGIT 2:
FLOW METER
0 NONE 1 OR IFICE 2 TURBINE/PD 3 VENTURI 4 MASS 5 MULTI
DIGIT 3:
STREAMS/ CHANNELS
1 SINGLE 2 DUAL 3 TRIPLE 4 QUAD 5 1, 2, 3 or 4
DIGIT 4:
SPECIAL
0 – 9
Page 3.3
Chapter 3 About the Micro Motion® 7951
For example, for a 7951 Dual-Channel Gas Signal Converter, the software version number is 511020. You can find the software version number in two ways:
1. It is printed on a label at the rear panel of the 7951.
2. It is written into the menu structure – see Chapter 12.
Page 3.4
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