Manuals & Guides: Signal Converter with Liquid Software - Model 7950 | Micro Motion
Table of contents
Loading...Micro Motion Manuals & Guides: Signal Converter with Liquid Software - Model 7950 | Micro Motion Manuals & Guides
®
r
Operating Manual
MMI-20019471, Rev. AA
April 2011
7950 Signal Converter
(With Liquid Software 2010)
Introduction
The Micro Motion
for single-stream density and viscosity applications.
Software Version:
2010 – Liquid Density and Viscosity Applications.
Models Covered
7950MAA5*****
:
®
7950 liquid signal converter can be used
:
Micro Motion
7950 Signal Converte
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 502010, issue 2.81.
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:
Electricity is dangerous and can kill.
Disconnect all power supplies before proceeding.
• All power leads are un-powered.
• All power leads are disconnected from the equipment which you are working on unless the
instructions tell you otherwise.
• 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
• It is essential that the Lithium Cell used for the battery backup is installed at all times (other than during
replacement). The 7950 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.
• 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 version 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: 7950 with a 7826/35/45/46/47 densitometer 2.2
2.5 Example 2: 7950 with a 7827 viscometer 2.5
2.6 Output Connections 2.8
2.6.1 Relay Ouput 2.8
2.6.2 Digital (Status) Outputs 2.8
3. About the Micro Motion® 7950 3.1
3.1 Background 3.1
3.2 What the 7950 Liquid Signal Converter does 3.1
3.3 Physical description of the 7950 3.2
3.4 Communications 3.3
3.5 Typical installations 3.4
3.6 Checking your software version 3.5
4. Installing the system 4.1
4.1 What this chapter tells you 4.1
4.2 Hazardous and non-hazardous environments 4.1
4.3 Installation procedure 4.1
4.4 Step 1: Drawing up a wiring schedule 4.1
4.5 Step 2: Unpacking the instrument 4.1
4.6 Step 3: Setting DIP switches 4.2
4.7 Step 4: Fitting the 7950 4.3
4.8 Step 5: Making the connections 4.3
4.9 Step 6: Earthing the instrument 4.4
4.10 Step 7: Connecting the power supply 4.5
5. The keyboard, display and indicators 5.1
5.1 What this chapter tells you 5.1
5.2 The layout of the front panel 5.1
5.3 What the display shows 5.2
5.4 How the buttons work 5.2
5.5 Using the buttons to move around the menus 5.2
5.6 Using the buttons to view stored data 5.3
5.7 Using the buttons to edit information 5.4
5.7.1 Text editing 5.4
5.7.2 Multiple-choice option selection 5.5
5.7.3 Numerical editing 5.5
5.7.4 Date and time editing 5.6
5.8 The 795x character set 5.7
5.9 LED indicators 5.7
5.10 Summary of key functions 5.8
6. The menu system 6.1
6.1 What this chapter tells you 6.1
6.2 What the menu system does 6.1
6.3 How the menu system works 6.1
7. Serial Communications and Networking 7.1
7.1 What this chapter tells you 7.1
7.2 7950 Communication capabilities 7.1
7.3 MODBUS from the 7950 point of view 7.1
7.4 Connecting the 7950 to A MODBUS network 7.3
7.4.1 RS-232 connections 7.3
7.4.2 RS-485 (half duplex) connections 7.4
7.5 Configuring the 7950 to be a MODBUS slave 7.6
7.5.1 Port configuration 7.6
7.5.2 High speed list configuration 7.7
7.6 Database access over a MODBUS network 7.8
7.6.1 Introduction 7.8
7.6.2 Database information type 1 : Data values 7.9
7.6.3 Database information type 2 : Data states 7.10
7.6.4 Database information type 3 : Reply size and type 7.11
7.7 Alarm logger access over a MODBUS network 7.12
7.8 High speed list access over a MODBUS network 7.15
8. Alarms and Events 8.1
8.1 Alarms
8.1.1 Alarm types
8.1.2 Alarm indicators 8.1
8.1.3 How alarms are received and stored 8.2
8.1.4 Examining the Status Display and Historical 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 entries in the Historical Alarm Log 8.4
8.1.8 User-defined alarms X and Y 8.5
8.1
8.1.9 User-defined ‘comparison’ limit alarm 8.6
8.1.10 Alarm Logger Output (ALO) 8.7
8.1.11 Alarm Message List 8.8
8.2 Events 8.9
8.2.1 Introduction to 795x events 8.9
8.2.2 Event indicators 8.9
8.2.3 How events are received and stored 8.9
8.2.4 Examining the Event Summary and the Event Log 8.10
8.2.5 What the Event Status Display tells you 8.10
8.2.6 What the entries in the Historical Event Log will tell you 8.11
8.2.7 Clearing all entries in the Historical Event Log 8.12
9. Additional facilities 9.1
9.1 What this chapter tells you 9.1
9.2 Averaging data 9.1
9.3 Selecting units and data formats 9.1
9.4 Limits 9.2
9.5 Fallback values and modes 9.2
9.6 Units which the 795x can display 9.3
9.7 Automated calibration procedures 9.4
9.7.1 Covimat - Static Zero Calibration (in air) 9.4
9.7.2 7827 Liquid Density Transducer 9.6
9.8 Feature: PID Control 9.8
9.8.1 Overview 9.8
9.8.2 Configuration details 9.9
9.8.3 Ramp-limit safeguard 9.11
9.8.4 Anti-Reset-Windup safeguard 9.12
10. Configuring with Wizards 10.1
10.1 Introduction to Wizards 10.1
10.2 Using Wizards 10.1
10.3 Quick-view Guide (Set-up Wizards) 10.3
10.4 Units Wizard Selection 10.4
11. Configuring without the Wizards 11.1
11.1 What does configuration involve? 11.1
11.2 Before you start 11.1
11.3 What will the sections tell you 11.1
11.4 Configuration Guide 11.2
11.5 Live Inputs
11.5.1 Analog Inputs 11.5
11.5.2 Time Period Inputs 11.6
11.6 Temperature Channels (A to K) 11.7
11.7 Pressure 11.8
11.8 Density 11.9
11.8.1 Transducer measured density 11.9
11.5
11.8.2 4x5 Matrix referred density 11.11
11.8.3 API referred density 11.13
11.8.4 Specific gravity 11.15
11.8.5 Degrees Brix 11.15
11.8.6 Degrees Baumé 11.16
11.8.7 Percent Mass 11.16
11.8.8 Percent Volume 11.17
11.8.9 Degrees Twaddell 11.17
11.8.10 Degrees API 11.18
11.8.11 Special Equation Type 1 11.19
11.9 Viscosity 11.21
11.9.1 7827 measured viscosity 11.21
11.9.2 Kinematic viscosity measurement 11.23
11.9.3 4x5 Matrix reference viscosity 11.24
11.9.4 ASTM D341 reference viscosity 11.26
11.9.5 Multi-curve ASTM reference viscosity 11.28
11.9.6 Ignition indexes 11.30
11.9.7 Saybolt Universal Viscosity 11.31
11.9.8 Saybolt Furol Viscosity 11.32
11.9.9 Special Equation Type 4 11.33
11.10 Interface Detection (Density/Viscosity zoning) 11.34
11.11 Custom Applications 11.35
11.11.1 Special Equation Type 2 11.35
11.11.2 General Constants 11.35
11.12 Live outputs 11.36
11.12.1 Analog Outputs 11.36
11.12.2 Information on Averaging and Filtering 11.37
11.13 Other Parameters 11.38
11.13.1 What the “Other parameters” option does 11.38
11.13.2 Passwords and security 11.39
11.13 Multiview 11.41
12. Routine operation (Data maps) 12.1
12.1 Viewing the data 12.1
12.2 Checking the performance of the 795x 12.3
12.3 Printed reports 12.5
12.4 Giving your 795x a tag number 12.6
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 14.3
14.3 Connector board 14.4
14.4 Microprocessor board 14.5
14.5 Screen and RFI conductive strips 14.5
14.6 Terminal cover seal 14.7
14.7 Gland plate seal 14.8
14.8 Fuses 14.9
14.9 Back-up battery 14.10
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 A.1
Appendix A Glossary A.1
Appendix B Blank wiring schedule B.1
Appendix C Technical data for the 7950 C.1
Appendix D Calculations and theory D.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 documentatio n
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 so ftw are which applie s to y our machine only .
Throughout this manual the term '795x' is used to refer to all members of the 795x family (7950, 795 1, and 7955).
Chapter 1 About this manual
1.2 Who should use 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 7950, the worked examples in this chapter can help you to become familiar with the
installation and configuration procedures. The examples are:
• 7950 with a 7826, 7835, 7845, 7846 or 7847 liquid densit y transducer (see page 2.2).
• 7950 with a 7827 viscometer (see page 2.5).
Work through whichever one is most like your installation. Section 2.6 provides details of connections required
for the relay output and the digital (status) outputs.
2.2 What the examples show you
Each example shows you how to:
• Wire up a simple system in a non-hazardous area.
• Set the DIP-switches inside the 7950.
• Find the menu from which you start configuration.
• Clear the memory of details of any existing configuration (OPTIONAL).
• Select the appropriate wizard to configure the simple system.
• Work through the wizard and input information.
• 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 4 tells you how to make permanent
installations.
Chapter 2 Getting started
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 the ENTER button until you can start selecting NO.
3. Carry on with (1) and (2) until you return to the wizard selection 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 5 gives a full explanation of what all the buttons do.
Page 2.1
Chapter 2 Getting started
2.4 Example 1: 7950 with a 7826/35/45/47 densitometer
About this example
This example shows you how to connect a 7826, 7835, 7845, or 7847 densitometer to the 7950, and then uses
the Liquid Density 1 wizard to configure the system. The Multi-view button can then be used to instantly display
the latest density and temperature readings.
In this example, the Liquid Density 1 wizard configures the connections as follows:
• The densitometer is connected to the Time Period Input 1 terminals.
• The PRT is connected to Analogue Input 1 terminals.
Work through the example by following the instructions below. Refer to Chapter 5 if you are not sure where the
buttons are.
Connect the
transducer
1. Wire the densitometer to the 7950 terminals, as in Figure 2.1 or Figure 2.2
2. To comply with EMC regulations, you must earth the 7950 to a suitable earth point.
Figure 2.1: Wired connections (7835, 7845, or 7847 with Standard Electronics)
Figure 2.2: Wired connections (7826 Frequency Output densitometer)
Page 2.2
Chapter 2 Getting started
Set DIP switches 3. Make sure that the DIP-switches are set as shown in Figure 2.3.
4
D
C
4-20mA
3
2
1
PRT
B
A
Figure 2.3: DIP-switch settings for Example 1
Turn on the power 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 that may appear.
Go to the wizards
menu
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 to go to Page 2 of the menu.
7. Press the c-button to select “Configure”.
8. Press the a-button twice to go to the wizard selection menu.
Clear existing
configuration
(This is optional)
9. Press the b-button and then use 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 display line 2 changes to “Select option”.
Select the wizard 13. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “Liquid density 1” is shown.
14. Press the b-button to select “Liquid density 1”.
Start of wizard 15. Press the d-button to answer YES to the ‘Load Liquid density defaults?’ prompt.
Enter
densitometer
calibration factors
16. Press the d-button to answer YES to the ‘Edit density coefficients?’ prompt.
17. Press the b-button, then input the factor K0 from the Calibration Certificate for the
transducer. (See Figure 2.4 on page 2.4 for an illustration of the certificate).
18. Press the b-button followed by the ENTER button to confirm the K0 value.
19. Enter values for factors K1 and K2 in the same manner as factor K0.
Enter temperature
correction factors
20. Press the d-button to answer YES to the ‘Edit Liquid density correction?’ prompt.
21. Press ENTER button to keep the “Temperature” correction selected.
23. Enter values for factors K18 and K19 in the same manner as factor K0.
Skip questions 24. Use the c-button to answer NO to all further prompts until the Wizard is exited.
View how you
have configured
Line density
View the Multiview display
25. Press the MENU button.
26. Press the a-button twice. The display should now look similar to Figure 2.5, although the
values and text shown may vary.
27. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in
Figure 2.6, although the text and values shown may vary.
End of Worked Example 1
Page 2.3
Chapter 2 Getting started
r
Figure 2.4: Where to obtain values for K0, K1, K18 and K19 from the Calibration Certificate
Line density
265.54
Kg/m3
Live
Figure 2.5: Line density display
Text width setting – a movable
boundary between text and value
Page 2.4
Line dens 685.05
Ref Den s 0.000
Temp 29.5
Press 0.00
Text (e.g. parameter names)
Figure 2.6: Multi-view display (after Liquid Density 1 wizard)
Value of paramete
2.5 Example 2: 7950 with a 7827 viscometer
About this example
This example shows you how to connect a 7827 viscometer to the 7950 and then us es the 7827 Density/Viscosity
wizard to configure the system. The Multi-view button can then be used to instantly display the latest viscosity,
density and temperature readings.
In this example, the 7827 Density/Viscosity wizard configures the connections as follows:
• The viscometer is connected to Time Period Input 3 terminals.
• The PRT is connected to Analogue Input 1 terminals.
Now work through the example by following the instructions below. If you are not sure where the buttons are,
refer to Chapter 5.
Connect the
transducer
1. Wire the 7827 viscometer to the 7950 terminals, as in Figure 2.7.
2. To comply with EMC regulations, you must earth the 7950 to a suitable earth point.
Chapter 2 Getting started
Set DIP
3. Make sure that the DIP switches are set as shown in Figure 2.8.
switches
Figure 2.7: Wired connections for 7827
4
D
C
4-20mA
3
2
1
PRT
B
A
Figure 2.8: Dip-switch settings for Example 2
Page 2.5
Chapter 2 Getting started
Turn on the power 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 that may appear.
Go to the wizards
menu
5. Press the MAIN MENU button to go to Page 1 of the Main Menu (if you aren’t there already).
6. Press the DOWN-ARROW button to go to Page 2 of the menu.
7. Press the c-button to select “Configure”.
8. Press the a-button twice to go to the wizard selection menu.
Clear existing
configuration
(This is optional)
9. Press the b-button and then use 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 display line 2 changes to “Select option”.
Select the wizard 13. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through the
option list until “7827 dens/visc” is shown.
14. Press the b-button to select “7827 dens/visc”.
Start of wizard 15. Press the d-button to answer YES to the ‘Load 7827 visco sity defaults?’ prompt.
Find out the
viscosity ranges
for which the 7827
16. The 7827 is calibrated for one or more of the viscosity ranges: High, Medium, Low or Ultra-
low. Check with the Calibration Certificate to see which ranges your instrument is
calibrated for. (See
Figure 2.9.)
is calibrated.
Select the ranges
for which your
transducer is
calibrated
solartron
S
S
7827ACALMT VISCOMETER SERIAL NO
VISCOSITY CALIBRATION @ nn C (T-piece)
DENSITY CALIBRATION @ nn C (T-piece)
VISCOSITY CORRECTION DATA
Dv = D t + (K20 + K21.1/Q**2 + K22.1/Q**4)
where
Ref No:- xxnnnn/Vn.n
O
VISCOSITY = V0 + V1.1/Q**2 + V2.1/Q**4
QUALITY
VISCOSITY
(cP)
FACTOR
INSTRUMENT CHECK DATA
nnn.nn
n
nnn.nn
nn
AIR POINT (nn C) QUALITY FACTOR
nn.nn
nnn
nn.nn
nnn
nn.nn
VISCOSITY CODE (for 7945V/6V) = nnnn
nnnn
nn.nn
nnnn
nn.nn
nnnnn
LOW RANGE
ULTRA-LOW RANGE
(n-nnn)
(n-nnn)
-n.nnnnnE+nn
-n.nnnnnE+nn
V0 =
n.nnnnnE+nn
n.nnnnnE+nn
V1 =
n.nnnnnE+nn
n.nnnnnE+nn
V2 =
O
TIME PERIOD B
DENSITY
3
(usec)
(Kg/m)
nnn.nnn
n
n.n
nnn.nnn air check
nnn.nnn
nnn
nnn.nnn
nnn
nnn.nnn
nnn
nnnn
nnn.nnn
nnn.nnn
nnnn
MEDIUM RANGE
K20 =
-n.nnnnnE+nn
n.nnnnnE+nn
K21 =
n.nnnnnE+nn
K22 =
D = Density (uncorrected)
Dt = Density (temperature corrected)
Dv = Density (temp and viscosity corrected)
TB = Time period B (uS)
Q = Quality Factor
o
t = Temperature ( C)
DENSITY = K0 + K1.TB + K2.TB**2
Dt = D( 1 + K18(t-20) ) + K19(t-20)
17. Press the d-button to answer YES to the question ‘Edit viscosity coefficient?’
18. Press the b-button, and then use the UP-ARROW button repeatedly until the display
shows the combination of viscosity ranges which applies to your 7827.
19. Press the b-button to select the option and then press the ENTER button to confirm that
you want to edit those viscosity ranges.
LOW RANGE
(n-nnn)
-n.nnnnnE+nn
n.nnnnnE+nn
n.nnnnnE+nn
-n.nnnnnE+nn
K0 =
K1 =
K2 =
K18 =
K19 =
n.nnnnnE-nn
n.nnnnnE-nn
-n.nnnE-nn
-n.nnnE+nn
MEDIUM RANGE
(nnn-nnnn)
-n.nnnnnE+nn
n.nnnnnE+nn
n.nnnnnE+nn
o
MEDIUM RANGE
(nnn-nnnn)
-n.nnnnnE+nn
n.nnnnnE+nn
n.nnnnnE+nn
K0 =
K1 =
K2 =
K18 =
K19 =
CAL DATE
PRESSURE TEST
-n.nnnnnE+nn
-n.nnnE-nn
-n.nnnE+nn
n.nnnnnE-nn
n.nnnnnE-nn
FINAL TEST &
INSPECTION
DATE : xxxxxxx
: nnnnnn
: xxxxxxx
:nnBAR
HIGH RANGE
(nnn-nnnnn)
n.nnnnnE+nn
n.nnnnnE+nn
n.nnnnnE+nn
ULTRA-LOW RANGE
(n-nnn)
-n.nnnnnE+nn
V0 =
n.nnnnnE+nn
V1 =
n.nnnnnE+nn
V2 =
= nnnn
DENSITY = K0 + K1.TB + K2.TB**2
Dt = D( 1 + K18(t-20) ) + K19(t-20)
HIGH RANGE
(nnn-nnnnn)
n.nnnnnE+nn
n.nnnnnE+nn
n.nnnnnE+nn
Page 2.6
Figure 2.9: Where to find values for V0, V1, V2, K0, K1, K2, K18 and K19 from the calibration certificate
r
Enter the
calibration factors
for each viscosity
range
Enter density
calibration factors
Enter temperature
correction factors
Skip over the next
few questions
View Line
Dynamic viscosity
View Multi-view
display
End of Worked Example 2
Chapter 2 Getting started
20. Repeat for each viscosity range (as selected in step 19):
• Press the b-button, and then input the factor V0 for the viscosity range.
• Press the b-button again, and then ENTER to confirm the details.
• Enter values for calibration factors V1 and V2 in the same manner as for V0.
• Press ENTER button to accept the default value (1.0) for the scale factor.
21. Press the d-button to answer YES to the ‘Edit Density coefficient?’ prompt.
22. Press the b-button then enter the value for factor K0 from the Calibration Certificate.
23. Press the b-button and then press the ENTER button to accept the K0 value.
24. Enter values for factors K1 and K2 in the same manner as for factor K0.
25. Press the d-button to answer YES to ‘Edit Liquid density correction?’ prompt.
26. Press ENTER button to keep the “temperature” correction selection.
27. Enter the value for factors K18 and K19 in the manner as for factor K0.
28. Press the c-button several times to answer NO to all questions until the wizard is exited
29. Press the MAIN MENU button.
30. Press the b-button and then the a-button. The display will look similar to that shown in
Figure 2.10, although the text and values shown may vary.
31. Press the MULTI-VIEW DISPLAY button. The display will look similar to that shown in
Figure 2.11, although the text and values shown may vary.
Line dyn visc
1000
cP
Live
Figure 2.10: Line Dynamic Viscosity display
Text width setting – a movable
boundary between text and value
Dyn.Visc 1000.00
Kin.Visc 0.000
Dens 0.000
Temp 29.5
Text (e.g. parameter names)
Figure 2.11: Multi-view display (after 7827 Density/Viscosity wizard)
Value of paramete
Page 2.7
Chapter 2 Getting started
2.6 Output Connections
2.6.1 Relay Output
There are 2 contacts:
1: “Normally Open” pin (PL5/1) or
2: “Common” pin (PL5/2).
This output functions as a ‘Watchdog’ for indicating the presence of at least one active alarm. For example, the
Normally Open (NO) contact is energised only if there is an alarm.
2.6.2 Digital (Status) Outputs
These outputs are of the open-drain type. Work through parts 1, 2 and 3 to understand all the physical
connections that need to be made to the 7950:
1. Power usage - external power (recommended)
“Normally Closed” pin (PL5/3)
This diode protects 7950
against reverse voltages
7950
External power supply provides
voltage and current suitable for
user selected relay.
Status output
0V from external power supply
Status output common
Figure 2.12: Wiring a Status Output
2. Status Output “Common” Pin
7950 Pin Comment
PL7/9 Use this pin for status outputs 2 to 4.
PL7/10 Use this pin for status outputs 5 to 8.
Page 2.8
3. Status Output “Signal” Pin
Status O/P Default Function 7950 Pin
2 Limit Alarm Watchdog (ALO) PL7/2
3 Input Alarm Watchdog (ALO) PL7/3
Refer to Chapter 8 for information on alarm watchdog (ALO)
function. Status Outputs 4 to 8 are not used.
3. About the Micro Motion® 7950
3.1 Background
The Micro Motion® 7950 was developed to meet the demand for a reliable, versatile, user-friendl y and costeffective instrument for liquid and gas metering. It has a Motorola 68332 32-bit microprocessor and surfacemounted circuit board components so that it is powerful, reliable and compact.
Features of the 7950 include:
• Simple access to information.
• Comprehensive interrogation facilities.
• Alarm and alarm history facilities.
• A menu-driven, user-friendly interface.
• NEMA 4X, IP65 enclosure.
• Dc powered.
• Three serial communication ports (using RS232 or RS485) for MODBUS communications and printing.
These facilities are described in more detail in the rest of this chapter.
Chapter 3 About the Micro Motion® 7950
3.2 What the 7950 liquid signal converter does
Utilising field transmitters and transducers, the 7950 will calculate:
• Line density.
• Line dynamic viscosity.
• Line kinematic viscosity.
• Temperature (A to K).
• Line pressure.
From these values the 7950 can derive:
• Matrix temperature referred density, corrected for pressure.
• API referred density.
• Saybolt universal viscosity (ASTM D2161).
• Saybolt viscosity at 122 deg.F.
• Saybolt viscosity at 210 deg.F.
• Referred viscosity (ASTM D341 equation, multi-curve ASTM or 4x5 Matrix ).
• Ignition indexes CAII and CII.
Additional features:
• Interface detection - den sity or viscosity zoning
• PID Control
• User defined equations (Types 1, 2 and 4)
• Multi-view (display key)
• Analogue Outputs
• Security.
Page 3.1
Chapter 3 About the Micro Motion® 7950
3.3 Physical description of the 7950
The 7950 is a wall-mounted instrument housed in a one-piece case. The upper part of the instrument has a
panel on which are mounted the keyboard and display. Below this, and stepped back slightly, is a terminal cover
which, when removed allows access to the electrical connectors on the connector board inside the instrument.
All wiring enters the case from underneath, through the gland plate which has to be drille d for the purpose.
The connector board is mounted vertically inside the back of the case. The microprocessor board is attached, by
six screws and stand-offs, to the back of the keyboard and display.
The upper and lower parts of the instrument are separated by a horizontal metal plate (the screen) which helps
to protect the instrument against electro-magnetic interference.
Page 3.2
Figure 3.1: The 7950 and its major assemblies
3.4 Communications
The 7950 can operate as a MODBUS slave. It can:
• Download a configuration from a PC, DCS, etc.
• Upload a configuration.
• Monitor random locations in the 7950.
• Interrogate the alarm and data logger buffers.
• Manipulate the alarm and data logger buffers.
• Set random locations with new data.
• Instigate printed reports.
Chapter 7 in this manual gives full details on communications with the 7950 instrument.
3.5 Typical installations
Figure 3.2 (below) and Figure 3.3 (on page 11.4) illustrate two typical applications that are supported.
Chapter 3 About the Micro Motion® 7950
Part of pipeline
PT
DT
TE
4-wire PRT
Transducers and transmitters
Static pressure transducer
PT
DT
Density transmitter
Temperature element (PRT)
TE
7950
solartron
4-20mA
Frequency
S
instruments
V
V
8 9
7
a
6
4 5
b
1 2
3
c
+/-
0
d
CLR EXP
1
2
Alarm
Analogue outputs
Printer
MODBUS communications
to and from host computer
Figure 3.2: Liquid Density Application
Page 3.3
Chapter 3 About the Micro Motion® 7950
p
Part of pipeline
V
DT
TE
4-wire PRT
Frequency
4-20mA (from Covimat range)
OR Frequency (from a 7827)
MODBUS communications
to and from host com
Figure 3.3: A typical oil blending application
3.6 Checking your software version
Transducers and transmitters
Viscometer (Covimat or 7827 transducer)
V
DT
Density transmitter
Temperature element (PRT)
TE
solartron
S
instruments
V
V
8 9
7
a
6
4 5
b
1 2
3
c
+/-
0
d
CLR EXP
1
2
7950
uter
Alarm
Analogue outputs
Printer
The 7950 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 LIQU ID
3 BOTH
4 OTHER
PREFIX DIGIT 1 DIGIT 2 DIGIT 3 DIGIT 4
DIGIT 2:
FLOW
METER
0 NONE
1 ORIFIC E
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
SOFTWARE VERSION NUMBER
DIGIT 4:
SPECIAL
0 – 9
Figure 3.4: Software version number
For example, for a 7950 Liquid Signal Converter, the software version number is 502010.
You can find the software version number in two ways:
1. It is printed on a label at the rear panel of the 7950.
2. It is written into the menu structure – see Chapter 12.
Page 3.4
4. Installing the system
4.1 What this chapter tells you
This chapter gives you full instructions for installing the 7950.
It does not go into detail about how to install any peripheral devices (such as transducers, computers or printers)
which can be connected to the 7950. For this information you must refer to the documentation supplied with
these items.
4.2 Hazardous and non-hazardous environments
If all or part of an installation is in an area where there is the risk of fire or explosion, then barriers usually have to
be wired into the circuit. However, some instruments are explosion-proof and barriers are not therefore needed.
You must follow the manufacturers’ instructions and safety recommendations fully.
4.3 Installation procedure
Chapter 4 Installing the system
Briefly, the procedure is:
Step 1: Draw up a wiring schedule.
Step 2: Unpack the 7950.
Step 3: Set the DIP switches.
Step 4: Fit the 7950.
Step 5: Make all external connections.
Step 6: Earth the installation.
Step 7: Connect power supply.
The steps in the procedure are explained in the following sections.
4.4 Step 1: Drawing up a wiring schedule
Before you make any connections, you must draw up a wiring schedule to help you identify wiring colours and
make sure that you do not connect more items of any given type than you are allowed to. (If you are in doubt,
check the specification in Appendix C.)
A blank copy of a wiring schedule is given in Appendix B.
4.5 Step 2: Unpacking the instrument
Remove the instrument from its packing and examine it to see if any items are loose or if it has been damaged in
transit. Check that all items on the shipping list are present. If any items are missing or if the equipment is
damaged, contact your supplier immediately for further advice.
What should be supplied with the 7950:
• Labels #1 - #20 for identifying the sockets.
• 4-way free socket for DC input.
• 3-way free socket for AC input.
• 10-way free socket for I/O (13 off).
• 1.6A and 400mA fuses (Note: these are spares).
• An operating manual (this manual).
Page 4.1
Chapter 4 Installing the system
Other items you must supply yourself:
• Cable glands (if you want to use them).
• Fixings (such as screws and plugs) suitable for fixing the 7950 to a wall.
Note: If you have ordered optional, additional facilities (such as extra outputs) these are already installed in
the machine.
4.6 Step 3: Setting DIP switches
The 7950 is supplied with the DIP-switches in these default settings:
• Turbine power: 8 VOLTS
• Security switch: NONSECURE
• Input 1 PRT
• Inputs 2-4: 4-20mA
Figure 4.1: Dip switches on the Connector Board
If you want to change these settings, do this as follows:
• Security The 7950 can work in a non-secure or securable mode. In non-
secure mode, anyone can have access to the signal converter. In
securable mode, access to many of the signal converter’s functions
can be protected by a password. At this stage, setting the DIP
switch only determines whether or not the instrument is capable of
being protected because the actual setting of the security is carried
out later when the instrument is configured.
• PRT or analog (4-20mA)
inputs
When you have set the dip switches, replace the terminal plate.
Note: The 7950 is always shipped from the factory with the security DIP-switch set to non-secure.
There are four dip switches (one per channel) which determine
whether the input to each channel is from a PRT or analogue
(4-20mA) transmitter. Set each DIP switch as you require.
Note: You also have to configure the inputs. This is explained in
Chapter 11.
Page 4.2
4.7 Step 4: Fitting the 7950
Caution:
You must not fit the 7950 where it may be subjected to extreme conditions or be liable to damage.
For further information about the environmental conditions within which it can operate, see Appendix C.
Chapter 4 Installing the system
Figure 4.2: Mounting details for the 7950
1. Undo and remove the six screws which secure the gland plate to the underneath of the instrument. Remove
the gland plate.
2. Drill whatever holes are required in the plate to allow the cables to enter the instrument. Do not replace the
gland plate at this stage.
3. Drill a pilot hole in the wall. Then, using whatever fixings (such as wall plugs) are suitable for the type of wall,
turn in a screw so that its head sticks out far enough so that the keyhole-shaped slot at the back of the case
can fit over it.
4. Fit the instrument on the wall.
5. Undo the four screws and remove the terminal cover.
6. Mark through the two instrument mounting holes then take the instrument off the wall.
7. Drill holes for screws at the marked positions. The holes should be wide enough to take wall plugs if these
are to be used.
8. If wall plugs are to be used, insert them into the holes.
9. Hang the instrument on the wall, insert the screws and tighten them sufficiently to hold the instrument in
place.
10. Replace the terminal cover.
4.8 Step 5: Making the connections
1. Refer to the documentation supplied with the external equipment to see if you have to carry out any special
procedures when connecting them to the 7950. Take special notice of any information about complying with
EMC regulations.
2. Pass the cables through the holes in the gland plate then connect the sockets to the wiring using your
schedule and the connection diagram (in Chapter 5) to help you.
3. Check the wiring thoroughly against the schedule and wiring diagram.
4. Connect the sockets to the plugs on the connector board.
5. Replace the gland plate.
Page 4.3
Chapter 4 Installing the system
4.9 Step 6: Earthing the instrument
Caution:
Incorrect earthing can cause many problems, so you must earth the chassis and the
electronics correctly. The way in which you do this depends almost entirely on the type of
installation you have and the conditions under which it operates. Therefore, because these
instructions cannot cover every possible situation, the manufacturers recommend that
earthing procedures should only be carried out by personnel who are skilled in such work.
The Chassis of the 7950 must be earthed in all cases; both for safety reasons and to ensure that the installation
complies with EMC regulations. Do this by connecting an earth lead from the stud on the gland plate to a local
safety earth such as pipework or some other suitable metal structure.
Connector
board
Earth
stud
Chassis earth lead
to external earth
Internal
earth lead
Gland
plate
Figure 4.3: Earthing the chassis of the 7950
In addition to earthing the chassis, you may have to make extra earth connections in some cases, depending on
the installation requirements. Details of this are given in Appendix C.
Page 4.4
4.10 Step 7: Connecting the power supply
Warning:
• Electricity is dangerous and can kill.
Caution:
• Power connections should not be made by anyone other than a qualified electrician.
Follow these 5 steps:
1. Switch off and disconnect all power supplies to the instrument (if you haven’t already done so).
2. If you are using cable glands, insert one into the appropriate hole in the gland plate.
3. Pass the power cable through the cable gland.
4. Before going any further, re-check that the wiring is connected correctly.
5. The instrument can work on either 110-230V a.c. or from a d.c. supply. Make the power connection, as
follows:
• For a.c. power: Plug the power connector into plug PL1.
• For d.c. power: Plug the power connector into plug PL2.
Note that you can connect the 7950 to both the d.c. and a.c. supplies if you want a d.c. back-up in case the mains
supply should fail.
The instrument goes through the following Power-On-Self-Test (POST) routine:
Chapter 4 Installing the system
• The display shows a sequence of characters or patterns to prove that all elements of the display are
working. There is a pause of five seconds between each change of pattern.
• The program ROM is checked against a checksum. The display shows how the test is proceeding.
• Critical data are checked. The display shows the result of this check.
• The coefficients are checked. The display shows the result of this check.
• The battery-backed RAM is checked. The display indicates progress.
• Any saved programs are checked. The display shows the number of programs and their status. Note
that, for a new machine, there are no stored programs.
• If a battery is fitted, its condition is checked and reported.
Note that, when the power is switched on, alarm LEDs may light up. You can ignore these for the moment - alarms
are explained in Chapter 8. As long as the POST is completed satisfactorily, the 7950 is ready to be configured
(see Chapters 10 and 11).
If the POST fails to complete, switch off the power and check all connections and the DIP switch settings.
Then re-connect the power supply. If the POST still fails to complete, switch off again and contact your supplier.
Page 4.5
Chapter 4 Installing the system
Page 4.6
Chapter 5 The keyboard, display and indicators
5. The keyboard, display and indicators
5.1 What this chapter tells you
This chapter tells you:
• How the front panel is laid out.
• What the buttons and indicators do.
• What characters you can display.
5.2 The layout of the front panel
Figure 5.1 shows the layout of the keyboard. The diagrams at the end of this chapter give a visual sum mary of
what each of the buttons do.
1. DOWN-ARROW 7. ENTER 13. PRINT MENU
2. UP-ARROW 8. INFORMATION MENU 14. STREAM/RUN SELECT
3. MULTI-VIEW DISPLAY 9. LIMIT ALARM LED 15. F1 (software specific function)
4. LEFT-ARROW 10. INPUT ALARM LED 16. SECURITY LED
5. RIGHT-ARROW 11. SYSTEM ALARM LED
6. BACK 12. MAIN MENU
Figure 5.1: The layout of the front panel
Page 5.1
Chapter 5 The keyboard, display and indicators
5.3 What the display shows
The display can show the following information:
• Numerical data in floating point, exponent or integer formats.
• Text descriptors.
• Units of measurement (if applicable).
• Status of parameters i.e. set, live, failed or fallback (if applicable).
• Alarm and event information.
• Current time and date.
• Identification number (location ID) of parameter.
• Stream (metering-run) identification number (if applicable).
5.4 How the buttons work
The buttons let you:
• Move around the menus.
• View data stored in the 795x – VIEW mode.
• Edit the data – EDIT mode.
Some buttons do different things according to where you are in the menu system. For example:
ENTER button This button does nothing until you get into EDIT mode. After you have
c button When you move through the menu structure this selects any menu
INFORMATION
MENU button
PRINT MENU
button
edited the data of a parameter, pressing ENTER accepts the changes
and puts the 795x back into VIEW mode.
choice shown against the button. However, when in VIEW mode,
pressing
This button does nothing if you are in EDIT mode. At other times, it
takes you to a special menu that provides information on alarms,
events, flow status and 795x operating mode.
This button does nothing if you are in EDIT mode. At other times, it takes
you to a special menu dealing with data archiving and printing of reports.
c lists the display units.
5.5 Using the buttons to move around the menus
A general tour of the menu system is provided in chapter 6. The buttons, which you can use to move around the
menu system, are:
UP-ARROW Moves the display up to the previous page of the menu. If there is no
DOWN-ARROW Moves the display down to the next page of the menu. If there is no
previous page, this button does nothing.
next page, this button does nothing.
Page 5.2
a - d buttons Each of these buttons selects the menu choice next to it. If there is no
:
BACK Returns you to the previ ous step.
menu choice next to a button, that button does nothing.
Loading...