Emerson 7951 - Manuals

Chapter 1 About this manual Page 1.1 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. Howev...

Chapter 2 Getting started Page 2.1 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: 795...

Chapter 2 Getting started Page 2.2 2.4 Example 1: 7951 with a 7810/11/12 gas density meter About this example This NON-HAZARDOUS (SAFE) AREA ONLY INSTALLATION † example shows you how to connect either a 7810, 7811 or 7812 gas density meter to the 7951, and then uses the “Density 1” wizard to configu...

Chapter 2 Getting started Page 2.5 View the Multi-view 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 pos...

Chapter 2 Getting started Page 2.7 Sig + Neg (24v) Power + 1 2 3 Klippon D-type PL5/9 PL5/5 PL5/6 PL5/10 SK6/22 SK6/18 SK6/19 SK6/24 7951 3096/3098 Barrier as defined in the latest 3096/3098 specification 1 2 3 4 (0v) Power - Signal - Signal + Intrinsically Safe Earth Figure 2.7: Hazardous area wiri...

Chapter 2 Getting started Page 2.8 Figure 2.8: Prime Specific Gravity display View the Multiview display 22. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.9 , although values and titles shown may vary. V Density 0.000 a b c d From Multi-view key V Invalid Multivi...

Chapter 2 Getting started Page 2.11 Figure 2.11: Line temperature data display End of Worked Example 3

Chapter 2 Getting started Page 2.13 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 which may appear. Go to the wizards menu 5. Press the MENU but...

Chapter 2 Getting started Page 2.14 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 t...

Chapter 2 Getting started Page 2.15 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 which may appear. Go to the wizards menu 5. Press the MENU but...

Chapter 3 About the Micro Motion ® 7951 Page 3.1 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 an...

Chapter 3 About the Micro Motion ® 7951 Page 3.2 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 communication...

Chapter 3 About the Micro Motion ® 7951 Page 3.3 3.5 Typical installations The diagram below illustrates a typical installation utilising the 7951 . PT TE DT 4-20mA 4-wire PRT Frequency MODBUS communicationsto and from host computer Part of pipeline Transducers and transmitters PT TE Static pressure...

Chapter 4 What you can connect to a 7951 Page 4.1 4. What you can connect to a 7951 The information in this chapter has been moved to Appendix C.

Chapter 5 Installing the system Page 5.1 5. Installing the system 5.1 What this chapter tells you This chapter gives full instructions for installing the 7951 . It does not go into detail about how to install any peripheral devices (such as transducers, computers or printers) which are connected to ...

Chapter 5 Installing the system Page 5.3 5.6 Step 3: Setting DIP-switches Some types of connection may require DIP-switches to be set. 5.6.1 Analogue Input DP-switches The 7951 has two blocks of DIP-switches on the Processor Board, as shown in Figure 5.1: x SW1 switches – select whether each input i...

Chapter 5 Installing the system Page 5.5 You can mount the clamp so that it is fixed permanently or can be removed later, if required. If you want the clamp to be fixed permanently, carry out Steps 3 - 8. If you want to be able to remove the clamp, carry out Steps 9 - 12. If the clamp is to be fixed...

Chapter 5 Installing the system Page 5.6 5.8 Step 5: Making the external 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 7951 . Take special notice of any information about safety requir...

Chapter 5 Installing the system Page 5.7 7951 7951 7951 7951 2 7951 7951 7951 7951 OK 2 PL1 SK3 7951 1 ( 1 ) Earth stud on 7951 rear panel (D-type and Klippon). ( 2 ) Cabinet earth or other suitable metal structure. Figure 4.7: Multiple 7951 chassis earthing (through studs and earth leads)

Chapter 5 Installing the system Page 5.8 5.10 Step 7: Connecting the power supply Plug the dc power connector into plug PL1 and switch on the power. The instrument goes through the following Power-On-Self-Test (POST) routine: x The display shows a sequence of characters or patterns to prove that all...

Chapter 6 The keyboard, display and indicators Page 6.1 6. The keyboard, display and indicators 6.1 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. 6.2 The layout of the front panel Figure...

Chapter 6 The keyboard, display and indicators Page 6.2 6.3 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, faile...

Chapter 6 The keyboard, display and indicators Page 6.3 MAIN MENU Moves you straight to page 1 of the top-level menu. INFORMATIONMENU Takes you to a special menu providing information on alarms, events, flow status and 795x operating mode. PRINT MENU Takes you to a special menu dealing with data arc...

Chapter 6 The keyboard, display and indicators Page 6.4 In VIEW mode, the buttons that you can use are: ‘ a ’ button On/off toggle for displaying the parameter’s unique identification number (location ID). This is displayed to the left of the status indication on line 4. ‘ b ’ button Puts the 795x i...

Chapter 6 The keyboard, display and indicators Page 6.6 DOT Inserts a decimal point. EXPONENT Use this button if you want to show numbers in exponent form. ‘ b ’ button If you want to accept the changes you have made, press the ‘ b ’ . The 795x will then revert to VIEW mode. (Note: ENTER also does t...

Chapter 6 The keyboard, display and indicators Page 6.7 6.8 The 795x character set You can use any of the 96 characters shown below as part of your display. Figure 6.3: The 795x character set 6.9 LED indicators Security Indicator This LED shows the present security level of the system. • RED FLASHIN...

Chapter 6 The keyboard, display and indicators Page 6.8 6.10 Summary of button functions The tables here provide a visual summary of the function for each button when in various modes. Table 6.1: Summary of what the buttons do (Part 1 of 2)

Chapter 7 The menu system Page 7.1 7. The menu system 7.1 What this chapter tells you Before you can configure and operate the 795x , you should have some understanding of how the menu system works. The menus are simple and intuitive, so they should present no problems to the average user. This chap...

Chapter 7 The menu system Page 7.2 Each menu choice is associated with a lettered button on the front panel - a , b , c or d . For example, a menu choice on Display Line 1 is associated with the a button. Similarly, a menu choice on Display Line 2 is associated with the b button, and so on. If there...

Chapter 7 The menu system Page 7.3 At the lowest levels in each branch of the menu system, there are parameter screens . Figure 7.4 shows how to navigate to the parameter screen for <MeterRun Temperature>. All parameter screens feature a solid, black, triangular shaped mark in the bottom-left ...

Chapter 7 The menu system Page 7.4 Returning to the top-level menu again, there are menu choices that are common to all software versions (Figure 7.5). In addition, you’ll encounter them in subsequent chapters. All other menu choices on the Main Menu (e.g. “Flow rates”) are for operators to quickly ...

Chapter 8 Alarms Page 8.2 8.1.3 How alarms are received and stored When a new alarm is received, the appropriate indicator LED on the front panel starts flashing. If the indicator is already flashing because of a previous alarm, it continues to do so. If the indicator is already ON (steady), it star...

Chapter 8 Alarms Page 8.3 8.1.5 What the Alarm Status Display tells you A typical Alarm Status Display is shown in Figure 8.2. The display lists, for each type of alarm (System, Input or Limit), the number of alarms that are live and new . • New alarms are alarms that have been received but not acce...

Chapter 8 Alarms Page 8.4 • Acceptance indication This is only shown for those entries that have not been accepted. When the entry is accepted, the indicator disappears. • Other entries indication An up-arrow symbol shows that there are entries before the present one, whilst a down-arrow symbol show...

Chapter 9 Additional facilities Page 9.1 9. Additional facilities 9.1 What this chapter tells you You can also specify features such as: • Fallback values and modes to be used if live inputs fail. • Limits which, if exceeded, trigger alarms. • The units in which the calculations are performed and ar...

Chapter 9 Additional facilities Page 9.2 9.4 Fallback values and modes A fallback value is used as a temporary substitute for a parameter if a live input (i.e., the transducer, transmitter or wiring), which is normally used to calculate the parameter, should fail. A fallback must have one of the fol...

Chapter 9 Additional facilities Page 9.3 9.7 Units which the 795x can display The 795x can display data values with many different units, as listed in Table 9.1 below. However, when communicating with other devices, the data is always sent using the standard units. In Table 9.1, the following defini...

Chapter 10 Configuring your instrument by using wizards Page 10.1 10. Configuring your instrument by using wizards 10.1 What this chapter tells you This chapter features complete maps of all the configuration wizards. Each map shows all the possible routes through a wizard. 10.2 Wizards: Configuring...

Chapter 10 Configuring your instrument by using wizards Page 10.2 "Option n" "Option 1" "Option 2" Heading Option 1Option 2Option n An item prompt that appears with the name of the itemalong with programmable properties - a value, units ofmeasurement and present status. Edit ...

Chapter 10 Configuring your instrument by using wizards Page 10.3 10.4 Quick-start Guide ( Set-up Wizards ) Wizard Measurement Task Page Density 1 • Gas density measurement (nominated as density ‘A’) from a single transducer that is connected to “Density input 1”. 10.6 Density 2 • Gas density measur...

Chapter 10 Configuring your instrument by using wizards Page 10.5 10.6 Units Wizard Selection Map After using the menu to arrive at the units wizard sub-menu, as shown earlier in Figure 10.1 , a wizard option can be chosen. Selection Procedure 1. Press the b-button to begin the selection process. 2....

Chapter 10 Configuring your instrument by using wizards Page 10.6 10.7 Density 1 application wizard See note 5 See note 4 See note 3 See note 2 "Yes" "Yes" "Yes" "Yes" "No" "No" "No" Appears for "Fallback value" only See note 1 "No&...

Chapter 10 Configuring your instrument by using wizards Page 10.7 "None" Route returns to :"Edit Density Limits & Fallback " prompt(on previous page) unless VOScorrection has also been selected. VOS "Temp" From "Part 1" page Density A corrections (Selection) None ...

Chapter 10 Configuring your instrument by using wizards Page 10.8 10.8 Density 2 application wizard See note 5 See note 4 See note 3 See note 2 "Yes" "Yes" "Yes" "Yes" "No" "No" "No" Appears for "Fallback value" only See note 1 "No&...

Chapter 10 Configuring your instrument by using wizards Page 10.9 "None" Route returns to :"Edit Density B Limits & Fallback "prompt (on previous page) unless VOScorrection has also been selected. VOS "Temp" From "Part 1" page Density B corrections (Selection) Non...

Chapter 10 Configuring your instrument by using wizards Page 10.10 10.9 SG-1 Application Wizard This wizard can be used to configure a system that has a 3096 gas specific gravity transducer connected to “Density input 3”. Special equations, analogue outputs, user alarms and multi-view can also be co...

Chapter 10 Configuring your instrument by using wizards Page 10.11 10.10 SG-2 Application Wizard This wizard can be used to configure a system that has a 3096 gas specific gravity transducer connected to “Density input 4”. Special equations, analogue outputs, user alarms and multi-view can also be c...

Chapter 10 Configuring your instrument by using wizards Page 10.12 10.11 SG-1&2 Application Wizard This wizard can be used to configure a system that has 3096 gas specific gravity transducers connected to “Density input 3” and “Density input 4”. Special equations, analogue outputs, user alarms a...

Chapter 10 Configuring your instrument by using wizards Page 10.13 10.12 Line density wizard This wizard configures the 795x for getting line density ‘A’ and/or line density ‘B’ data. "Temp and VOS" "No" "Yes" "VOS" Appears for "Fallback value" only "No...

Chapter 10 Configuring your instrument by using wizards Page 10.14 Sequence : Line density ‘B’ measurement "PTZ1" See "Part 1" page "VOS" "Yes" See "Part 1" page "Time Period" See "Part 1" page "No" "Analogue input" "Yes"...

Chapter 10 Configuring your instrument by using wizards Page 10.15 Sequence : Line density ‘B’ measurement using PTZ1 method Appearance of theseprompts depend onselection for "SGERGSelector". N See "Part 1" page "Yes" EditPTZ1 calculation ? No Yes AGA-NX19 PTZ1 calc select (S...

Chapter 10 Configuring your instrument by using wizards Page 10.16 10.13 Base density wizard This wizard configures the 795x for getting base density ‘A’ and/or base density ‘B’ data. Appears for "Fallback value" only "No" "Auto" Follow "A"+"B" route "B...

Chapter 10 Configuring your instrument by using wizards Page 10.17 Sequence : Base density ‘B’ measurement using the PTZ1 method Appearance of theseprompts depend onselection for "SGERGSelector". N To "Part 1" page "Yes" EditPTZ1 calculation ? No Yes AGA-NX19 PTZ1 calc select...

Chapter 10 Configuring your instrument by using wizards Page 10.18 10.14 Specific gravity wizard This wizard configures the 795x for getting specific gravity ‘A’ and/or specific gravity ‘B’ data. "No" "Yes" "Analogue input" "Base Density" "Time Period" "Au...

Chapter 10 Configuring your instrument by using wizards Page 10.19 Sequence : Specific gravity ‘B’ measurement from an analogue input "Yes" Turn to "Part 1" page Turn to "Part 1" page "No" EditSG B analogue input ? No Yes SG B mA Src (Selection) mA input 1 mA input 2 ...

Chapter 10 Configuring your instrument by using wizards Page 10.20 10.15 Temperature wizard This wizard configures the 795x for getting line temperature ‘A’ and/or density temperature ‘A’ and/or density temperature ‘B’ data. From "Part 2" page From "Part 2" page Turn "Part 2"...

Chapter 10 Configuring your instrument by using wizards Page 10.21 From "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Appears for "Fallback value" only "No " "No" "Yes" Edi...

Chapter 10 Configuring your instrument by using wizards Page 10.22 10.16 Pressure wizard This wizard configures the 795x for getting line pressure and/or atmospheric pressure data. Turn to "Part 2" page Turn to "Part 2" page "No" Note : 'n' is thenumber ofthe inputchannelsele...

Chapter 10 Configuring your instrument by using wizards Page 10.23 Sequence : Atmospheric pressure from an analogue input From "Part 2" page "No" "Yes" "No" "Yes" Edit Atmos. Pressure ? No Yes Atmosp input chl (Selection) mA input 1 mA input 2 mA input 10 Anal...

Chapter 10 Configuring your instrument by using wizards Page 10.24 10.17 Transmitter wizard This wizard configures the 795x for getting live CO 2 and/or live N 2 and/or live energy data. Turn to "Part 3" page "Cv/m" Turn to "Part 2" page Exit wizard "No" Note : 'n' is...

Chapter 10 Configuring your instrument by using wizards Page 10.25 Sequence : Live N2 from an analogue input From "Part 1" page "No" "Yes" Live N2 input chl (Selection) mA input 1 mA input 2 mA input 10 Analogue input n type (Selection) PT100 input 0 - 20mA input 4 - 20mA inp...

Chapter 10 Configuring your instrument by using wizards Page 10.26 Sequence : Live energy value from an analogue input From "Part 1" page "No" "Yes" Live energy input (Selection) mA input 1 mA input 2 mA input 10 Analogue input n type (Selection) PT100 input 0 - 20mA input 4 ...

Chapter 10 Configuring your instrument by using wizards Page 10.27 10.18 Special Calculation wizard "2" 'b' key "1" Setup wizard Special Calc. General equ. const A EditSpecial equation: 12 General equ. const B General equ. const X General equ. const Y General equ. ptr. a General equ....

Chapter 10 Configuring your instrument by using wizards Page 10.28 10.19 Analogue outputs wizard 'b' key "No" "Yes" "Yes" "No" "Yes" Setup wizard Analogue Outputs EditAnalog output 1? No Yes n =1 Return to the next "edit" prompt OR exit wizard if there...

Chapter 10 Configuring your instrument by using wizards Page 10.29 10.20 Alarms wizard "B" "A" "Y" 'b' key "X" Setup wizard Alarms Edit XUser Alarm: Y AB Exit wizard Comp alarm B ptr1 Comp alarm B ptr2 Comp alarm B limit Comp alarm A ptr1 Comp alarm A ptr2 Comp alarm ...

Chapter 11 Configuring by using the menus Page 11.1 11. Configuring by using the menus The recommended way of configuring the 795x is by using wizards, as explained in Chapter 10. But you should use the methods given here if: x You want to configure an installation which is very different from the e...

Chapter 11 Configuring by using the menus Page 11.2 11.3 Recommended sequence for configuration It is recommended that you configure items in the following order: 1. Inputs (See Section 11.5). 2. Transducer details (See Section 11.6). 3. Anything else such as Specific Gravity, Energy, Custom Applica...

Chapter 11 Configuring by using the menus Page 11.5 11.5 Configuring analogue inputs V a b c d a b c d V Flowmeter details Wizards Transducer details V Analogue inputs a b c d V Average Input type Value a b c d Analogue input 3Analogue input 4 Analogue input 1 Analogue input 7Analogue input 8 Analog...

Chapter 11 Configuring by using the menus Page 11.6 11.7 Configuring transmitter detail FIXEDInputdata Selectsource,valueandstatus LIVE Input data Analogue input 1 Analogue input 10 PRT PT100 or 4-20mA Un-referred temp CALCULATE TEMPERATURE 0% 100% TEMPERATURE REFERRAL (Orifice only) RESULTS Line Te...

Chapter 11 Configuring by using the menus Page 11.7 FIXEDInputdata Selectsource,valueandstatus LIVE Input data Analogue input 1 Analogue input 10 PRT PT100 or 4-20mA Un-referred temp CALCULATE TEMPERATURE 0% 100% TEMPERATURE REFERRAL (Orifice only) RESULTS Temperature (if limits areexceeded) ALARM L...

Chapter 11 Configuring by using the menus Page 11.9 V a b c d Flowmeter details Wizards Transducer details V Analog inputs a b c d Flow rate Line density V Totalisers a b c d V Atmos pressure Line pressure a b c d V Dens B temperature Line temperature a b c d Live CO2 Live N2 Temperature V a b c d V...

Chapter 11 Configuring by using the menus Page 11.10 11.8 Configuring flowmeter details LIVE Input data Differential press DP MASS FLOW RATE CALCULATION ISO 5167 OR AGA3 ALARM If limits areexceeded LIMITS FIXED Input data High Low LIVE Input data Prime density Qm VOLUME FLOW RATE CALCULATION RESULTS...

Chapter 11 Configuring by using the menus Page 11.11 FIXED Input data LIVE Input data Main turbinefrequency Lin K TURBINE LINEARISATION K-factor curve METER FACTOR RESULTS Qv Tr turbine temp ref CORRECTIONS A A X Factor x 3600 Kt temp corrections Kp press corrections RESULTS Qg x 3600 LIVE Input dat...

Chapter 11 Configuring by using the menus Page 11.12 LIVE Input data SG3096 CALCULATION Time period A3 Selectvalueandstatus Analogue input 1 SG Analogue input 10 SELECT A B PRIME SG DENSITY SELECTION RESULTS ALARM If limits areexceeded FIXED input data Specific gravity A Prime specificgravity Specif...

Chapter 11 Configuring by using the menus Page 11.13 Flowmeter details Wizards Transducer details V Analog inputs a b c d V a b c d Turbine K factor Flowstop threshold Turbine frequency V a b c d V a b c d V a b c d Turb freq hi limit Corrections Turb gross vol K Turbine K curve Error alarm limit Or...

Chapter 11 Configuring by using the menus Page 11.14 11.9 Configuring flow rate FIXED Input data LIVE Input data Main turbinefrequency Lin K TURBINE LINEARISATION K-factor curve METER FACTOR RESULTS Qv Tr turbine temp ref CORRECTIONS A A X Factor x 3600 Kt temp corrections Kp press corrections RESUL...

Chapter 11 Configuring by using the menus Page 11.15 LIVE Input data Mass flow rate STANDARD VOLUME FLOW RATE CALCULATION RESULTS ALARM If limits areexceeded LIMITS Qs RD Air density FIXED Input data High Low LIVE Input data Prime basedensity Mass flow rate STANDARD VOLUME FLOW RATE CALCULATION RESU...

Chapter 11 Configuring by using the menus Page 11.16 11.10 Configuring totalisers LIVE Input data Gross volume rate Qg (turbine only) Actual cycle time Actual cycle time Actual cycle time Actual cycle time Actual cycle time Qv Qm Qs Qe Total ptr Alarm Turbine 1 error pulses Turbine 2 error pulses RE...

Chapter 11 Configuring by using the menus Page 11.17 V a b c d Flowmeter details Wizards Transducer details V Analog inputs a b c d Flow rate Line density V Totalisers a b c d V Pulse output 5 a b c d V Pulse output 3Pulse output 4 Pulse output 1 a b c d Reset totalsInhibit totals Pulse outputs V a ...

Chapter 11 Configuring by using the menus Page 11.18 11.11 Configuring line density LIVE Input data 4-20 mA Time period A L density D temp A/B L press SG LIVE Input data Line density A/B CALCULATE LINE DENSITY FIXED Input data Tp Transducercalibration SG VOS Trans-ducer gam m a Density cal tem p VOS...

Chapter 11 Configuring by using the menus Page 11.19 LIVE Input data FIXED Input data Line temperature Line pressure AGA8 COMPRESSIBILITY CALCULATION AGA8 parameters Tbase Pbase Comp range RESULTS Z Zbase Molecularmass (M) ALARM Invalid component % Nitrogen % Carbon dioxide % Hydrogen sulphide % Wat...

Chapter 11 Configuring by using the menus Page 11.20 LIVE Input data FIXED Input data RESULTS Line temperature Line pressure Prime SG CO 2 N 2 Nx-19 COMPRESSIBILITY CALCULATION Compressibility Z Zbase Super compressibility FPV Mg LIVE Input data FIXED Input data RESULTS Nx-19mod COMPRESSIBILITY CALC...

Chapter 11 Configuring by using the menus Page 11.21 LIVE Input data FIXED Input data Line temperature Line pressure Base density LINEAR INTERPOLATION COMPRESSIBILITY CALCULATION K10 K11 K12 K13 Tbase Pbase RESULTS Z Zbase Figure 11.22 Calculating linear interpolation compressibility LIVE Input data...

Chapter 11 Configuring by using the menus Page 11.22 V a b c d Flowmeter details Wizards Transducer details V Analogue inputs a b c d Flow rate Line density V Totalisers a b c d V (Selection) Line dens prime sel a b c d V (Units) (Live or set) Prime density value a b c d Line density A Line density ...

Chapter 11 Configuring by using the menus Page 11.23 11.12 Configuring base density LIVE Input data LPress LTemp Z LDensity Selectvalueandstatus RESULTS Base density LIVE Input data Analogue input 1 CALCULATE BASE DENSITY FIXED Input data 100% 0% Analogue input 4 RESULTS Base density RESULTS Base de...

Chapter 11 Configuring by using the menus Page 11.24 LIVE Input data CALCULATE BASE DENSITY Prime SG Selectvalueandstatus Analogue input 1 CALCULATE BASE DENSITY Analogue input 10 NX-19 NX-19mod NX-19mod3h Z-SGERG Z-AGA8 Linear interpolation Select PTZ1 PTZ2 Select SELECT A B PRIME BASE DENSITY SELE...

Chapter 11 Configuring by using the menus Page 11.25 V a b c d Flowmeter details Wizards Transducer details V Analogue inputs Flow rate Line density V Totalisers V a b c d Base density Specific gravity V (Selection) Base dens prime sel a b c d V (Units) (Live or set) Prime base density a b c d Base ...

Chapter 11 Configuring by using the menus Page 11.26 11.13 Configuring specific gravity RESULTS Specific gravity LIVE Input data 3096SG FIXED Input data K0 Time Period A K2 Selectvalueandstatus RESULTS LIVE Input data Analogue input 1 FIXED Input data 100% 0% Analogue input 10 CALCULATE SPECIFIC GRA...

Chapter 11 Configuring by using the menus Page 11.27 LIVE Input data SG3096 CALCULATION Time period A3 Selectvalueandstatus Analogue input 1 SG Analogue input 10 SELECT A B PRIME SG DENSITY SELECTION RESULTS ALARM If limits areexceeded FIXED input data Specific gravity A Prime specificgravity Specif...

Chapter 11 Configuring by using the menus Page 11.28 V a b c d Flowmeter details Wizards Transducer details V Analog inputs a b c d Flow rate Line density V Totalisers a b c d V a b c d Base density Specific gravity V (Selection) Prime SG sel a b c d V (Live or set) SG prime value a b c d Specific g...

Chapter 11 Configuring by using the menus Page 11.29 11.14 Configuring energy mA ENERGY CALCULATION FIXEDInputdata Parameters (see below) LIVE Input data SG CO2 N2 Selectvalueandstatus Analogue input 1 Analogue input 10 4-20 mA Select 0% 100% ISO6976 ENERGY CALCULATION AGA5 ENERGY CALCULATION Cm Cm/...

Chapter 11 Configuring by using the menus Page 11.30 V a b c d Flowmeter details Wizards Transducer details V Analogue inputs a b c d Flow rate Line density V Totalisers a b c d V a b c d Base density Specific gravity V (Selection) Energy calc selector a b c d V Energy value a b c d Value Energy Cus...

Chapter 11 Configuring by using the menus Page 11.31 11.15 Configuring custom applications FIXED Input data RESULTS User Calculation Type 1 SPECIAL EQUATION 1 a(b+Xc) d e+Y f ) = A+B User calculation Type 1 SPECIAL EQUATION 2 FIXED Input data RESULTS A+Bt+Ct 2 = e User title A B C t User calculation...

Chapter 11 Configuring by using the menus Page 11.32 11.16 Configuring mA outputs mA output FIXED Input data mA (ANALOGUE) OUTPUT 0% Mode 100% Pointer Filter Values Cycle time Figure 11.36 mA outputs V a b c d Flowmeter details Wizards Transducer details V Analog inputs a b c d Flow rate Line densit...

Chapter 11 Configuring by using the menus Page 11.33 11.17 Configuring other parameters V a b c d Flowmeter details Wizards Transducer details V Analogue inputs a b c d Flow rate Line density V Totalisers a b c d V a b c d Base density Specific gravity V Period Density Fraction Atmos pressure a b c ...

Chapter 11 Configuring by using the menus Page 11.34 What the “Other parameters” option does Selecting “Other parameters” brings up the following options: x Display formats Lets you specify, for each parameter: The units which are used, together with the number of decimal places or exponential forma...

Chapter 11 Configuring by using the menus Page 11.35 Passwords and security Securable and non-secure modes The 7951 can work in a non-secure or securable mode . In non-secure mode, anyone can have access to any of the facilities. In securable mode, access to facilities can be protected by passwords....

Chapter 11 Configuring by using the menus Page 11.36 Setting or changing a password This can only be done when the present access level is “Programmer”. From the main menu, select the “Other parameters” option. Next, select the “Security” option. Choose the password option (i.e. Programmer, Engineer...

Chapter 11 Configuring by using the menus Page 11.37 11.18 Configuring Multiview V a b c d Flowmeter details Wizards Transducer details V Analogue inputs a b c d Flow rate Line density V Totalisers a b c d V a b c d Base density Compressibility V Line 2 parameter Line 2 text a b c d V Line 1 text a ...

Chapter 11 Configuring by using the menus Page 11.38 Configuring Multiview Outline of the procedure for configuring Multiview: Step 1: Decide what text you want to display You almost certainly want each line of the Multiview display to show the name (possibly in an abbreviated form) of a parameter w...

Dual Channel Gas Signal Converter Operating Manual Page i Molecular Weight of Gas Calculation The molecular weight of gas in the stream can be calculated independently of the compressibility calculations. Index for use withlist of associated data XX Molecular Weight Calculation 5 Molecular Weight 4 ...

Chapter 12 Routine operation Page 12.1 12. Routine operation 12.1 What this chapter tells you This chapter tells you how to carry out all those procedures which are a part of the normal operation of the 795x. It does not cover configuration, servicing or repair. These topics are dealt with elsewhere...

Chapter 12 Routine operation Page 12.2 V a b c d a b c d V Line density Flow rates Base density / SG V Flow totals a b c d Main Menu Level 3 menus Level 2 menus V (Units) (Live or set) (Selection name) a b c d Std vol flow rate Energy flow rate Volume flow rate Gross flow rate V a b c d V a b c d (U...

Chapter 12 Routine operation Page 12.3 V a b c d Line density Flow rates Base density / SG V Flow totals a b c d Pressure Raw gas data V Energy a b c d Main Menu Level 3 menus Level 2 menus Density B temp Base temperature Line temperature V a b c d Density B temp Line temperature V a b c d DensB tem...

Chapter 12 Routine operation Page 12.4 V a b c d a b c d V Line density Flow rates Base density / SG V Flow totals a b c d Pressure Raw gas data V Energy a b c d V a b c d Main Menu Custom application Health check Level 3 menus Level 2 menus Propane n-Butane V a b c d (Units) (Gas type) V a b c d V ...

Chapter 12 Routine operation Page 12.5 V a b c d Line density Flow rates Base density / SG V Flow totals a b c d Pressure Raw gas data V Energy a b c d V a b c d Main Menu Custom application Health check Level 3 menus Level 2 menus V Selected DP cell DP value a b c d V Turbine Errors Turbine freq. a...

Chapter 12 Routine operation Page 12.6 a b c d V Level 3 menus Level 2 menus V Ethane Methane a b c d Totals Normalise gas data V a b c d V a b c d Propane i-Butane n-Butane V a b c d n-Hexane n-Heptane i-Pentane V a b c d V a b c d V a b c d V a b c d n-Decane n-Nonane Helium n-Octane Live inputs A...

Chapter 12 Routine operation Page 12.7 V a b c d Line density Flow rates Base density / SG V Flow totals a b c d Pressure Raw gas data V Energy a b c d V a b c d Main Menu Custom application Health check Level 2 menus Enter password V a b c d Actual cycle time System idle time Time and date V a b c ...

Chapter 12 Routine operation Page 12.8 12.3 Security and passwords For more information about setting and changing passwords, and security in general, refer to chapter 10. 12.4 How you can edit displayed information The figure shows a typical display showing information about the inputs and outputs....

Chapter 12 Routine operation Page 12.9 12.6 Changing the units which are displayed To change the displayed units: 1. Go to the menu which displays the parameter, its value and units. 2. Press the c-button . The name of the unit currently in use shifts to the left of the display. 3. Press the UP-ARRO...

Chapter 12 Routine operation Page 12.10 12.11 Printed reports The two types of report The 795x can print out reports which give you information about the state of the system. There are two types of report: • Current report This shows the data currently stored in a list of up to 20 locations which yo...

Chapter 12 Routine operation Page 12.11 How to print a report 1. Referring to the diagram, select “Print reports”. 2. Select to print either an Alarm Log or Current Report. (There is a third selection - “Idle” - which lets you leave the menu without a report being printed.) The report is printed imm...

Chapter 13 Routine maintenance and fault-finding Page 13.1 13. Routine maintenance and fault finding 13.1 Cleaning the instrument You can use a cloth or sponge and water clean the outside of the instrument. Do not use caustic cleaning agents or abrasive materials. 13.2 Fault finding Although the ins...

Chapter 14 Removal and replacement of parts Page 14.1 14. Removal and replacement of parts Warning: • Electricity is dangerous and can kill. Disconnect the power supply before making any connections or dis-assembling the 7951 . 14.1 Front Panel Assembly 1. Undo and remove the four screws which secur...

Chapter 14 Removal and replacement of parts Page 14.2 14.3 Switch Panel 1. Remove the Front Panel Assembly as explained in Section 14.1 2. Undo the four screws and washers which attach the display to the bezel. Remove the display. 3. Un-solder the flexi cable from the key switch. Remove the spring c...

Chapter 14 Removal and replacement of parts Page 14.3 14.5 Power supply board 1. Undo and remove the four screws which secure the Bezel to the case. Withdraw the Front Panel Assembly to the limits of the connecting wiring then lay it on top of the case. 2. Pull the Power Supply Board forwards so tha...

Chapter 14 Removal and replacement of parts Page 14.4 14.8 Back-up battery 1. Ensure that the unit is disconnected from all power supplies. 2. Ensure that a new battery (CR2430) and a thin edged, non-conductive implement are within easy reach. 3. Undo the six captive screws which attach the front pa...

Chapter 14 Removal and replacement of parts Page 14.5 14.9 Rear Panel Assembly Warning: It is strongly recommended that in order to ensure continued compliance to EMC directives, you do not attempt to remove the rear panel assembly, but return the instrument to the factory. The instructions given be...

Chapter 14 Removal and replacement of parts Page 14.6 14.10 Mother Board Warning: It is strongly recommended that in order to ensure continued compliance to EMC directives, you do not attempt to remove the rear panel assembly, but return the instrument to the factory. 1. Remove the Rear Panel Assemb...

Chapter 15 Assembly drawing and parts list Page 15.1 15. Assembly drawing and parts list 15.1 What the drawing and parts list tell you The drawing and parts list show those parts of the 7951 which you can obtain as spares. To identify an item: 1. Find the item on the appropriate assembly drawing 2. ...

Chapter 15 Assembly drawing and parts list Page 15.2 Figure 15.1: Diagram for identifying and ordering spares

Chapter 15 Assembly drawing and parts list Page 15.3 Item no. Part number Description Quantity 1 79513701 Instrument case 1 2 79513703 Bezel 1 3 79511206 Display assembly 1 4 79510503 Motherboard assembly 1 5 79510505 79510504 Connector board assembly (Klippon connectors) Connector board assembly (D...

Appendix A Glossary Page A.1 Appendix A Glossary A ADC See Analogue to digital converter Address A number which uniquely identifies a location . Alarm An indicator which shows when a failure has occurred. Alarms are classified as System, Input or Limit. API American Petroleum Institute Analogue inpu...

Appendix A Glossary Page A.3 Degree Brix A unit on an arbitrary scale which can be converted into actual SG values. Used when describing the sugar content of aqueous solutions. Density The measured density of the fluid in a pipeline. Differential pressure The difference in pressure at two points in ...

Appendix A Glossary Page A.5 L LED See Light-emitting diode. Light-emitting diode A diode which light up when current flows through it. LED’s are usually used as indicator lights on instruments. Limit Limits are upper and lower values between which a measured parameter is expected to be. If the para...

Appendix A Glossary Page A.7 S Saybolt viscosity A viscosity measured using methods developed by the Saybolt company. It is obtained by timing how long the fluid takes to flow out of a cup through a hole of known size. The viscosity is expressed in units of time. Security code A code or password whi...

Appendix B Blank wiring schedule Page B.1 Appendix B Blank wiring schedule

Appendix B Blank wiring schedule Page B.3 External connections Name Ty p e Wi ri n g co lour Sig nal Comm ents 795x Instrumen t Sheet of W iring schedule Ba rrie r Pin Pi n Co nnector & pin no. Co nn ector & pin no.

Appendix C Technical data for the 7951 Page C.1 Appendix C Technical data for the 7951 C.1 What this Appendix contains • Ordering information – understanding model codes. • List of different types of external connections you can make to 7951 . • Technical Specification. • Rear panel connector diagra...

Appendix C Technical data for the 7951 Page C.2 C.3 External connections You can make the following types of external connections to the 7951 : • INPUTS Analog Inputs from devices which monitor continuously changing parameters and transmit analog signals. These include: • PRTs (PT100) • temperature ...

Appendix C Technical data for the 7951 Page C.3 • POWER SUPPLIES Inputs d.c. only Outputs d.c. only. These provide power within the 7951 and to some other external devices such as transducers. Isolation notes The isolation between the enclosure and all DC power inputs, signal inputs and signal outpu...

Appendix C Technical data for the 7951 Page C.4 C.5 Specification General Environmental Working temperature 0 to +50°C (-4 to +158°F) Storage temperature -20 to +70°C (-32 to 122°F) Relative humidity Up to 90% non-condensing Bump BS 2011 test Eb Vibration Tested to IEC publication 68-2-6, Part II, f...

Appendix C Technical data for the 7951 Page C.5 Inputs Analog Quantity 4 off, each selectable as PRT (PT100) or 4-20mA Options Option for extra 4-20mA inputs: 7951MAA*38*** (Klippon): 4 off 7951MAB*38*** (D-type): 6 off Type 0/4 to 20mA Span selection Unlimited (keyboard selectable) Uncertainty ±0.0...

Appendix C Technical data for the 7951 Page C.6 Input trigger level 0.5V RMS (1.2V p-p), Maximum 30V Input impedance 10k Ω nominal Digital (Status) Quantity 7951MAA****** (Klippon): 6 off 7951MAB****** (D-type): 10 off Options Option for extra status inputs: 7951MAA****** (Klippon): 0 off 7951MAB*38...

Appendix C Technical data for the 7951 Page C.7 Pulse Quantity 7951MAA****** ( Klippon): 3 off 7951MAB****** ( D-type): 5 off Options None Type Open-collector Darlington drivers Output rating 200mA @ 24V with 50% duty cycle Switch voltage 24V maximum Maximum frequency 10Hz Digital (Status) Quantity ...

Appendix C Technical data for the 7951 Page C.8 Hardware facilities Microprocessor Processor Motorola 68332 Clock speed 24 MHz Computation resolution 64-bit (IEEE 754), fully-floating point maths package. Embedded Real-time operating system. Computation accuracy < 1 part in 10 11 Memory Program s...

Appendix C Technical data for the 7951 Page C.9 Alarm annunciation Quantity 3 (one each for Input, System or Limit alarms) Type Red LED Operation Flash indicates new alarm condition. Steady indicates accepted alarm. Options None Security Mechanisms 1. Switch located on front panel 2. Software code I...

Appendix C Technical data for the 7951 Page C.10 C.6 Connections C.6.1 7951 D-type Rear Panel Pin PL1 SK1 SK2 SK3 SK4 SK5 SK6 SK7 SK8 1 E Com 2 Rx/Tx+ Com 3 Rx/Tx+ Stat ip 1 Stat op 2 Turb 1 + Ana op 1 PRT 3 pwr + 2 E Com 1 Tx Com 2 Tx Com 3 Tx Stat ip 2 Stat op 3 Turb 1 - Ana op 2 PRT 3 sig + 3 Sup...

Appendix C Technical data for the 7951 Page C.11 C.6.2 7951 Klippon Rear Panel Pin PL1 SK1 SK2 SK3 1 E Com 2 Rx/Tx+ Com 3 Rx/Tx+ 2 E Com 1 Tx Com 2 Tx Com 3 Tx 3 Supply - Com 1 Rx Com 2 Rx Com 3 Rx 4 Supply + 5 Com 0V Com 0V Com 0V 6 7 Com 2 CTS Com 3 CTS 8 Com 2 RTS Com 3 RTS 9 Com 2 Rx/Tx- Com 3 R...

Appendix C Technical data for the 7951 Page C.12 C . 6 Earthing In addition to earthing the chassis, (described in chapter 4), you may have to make extra earth connections in some cases, depending on the installation requirements. The types of connection can be split into three groups, each of which...

Appendix C Technical data for the 7951 Page C.15 Earthing requirements for group 1 connections only In general, the earthing arrangements are different for large and small installations. (A small installation may possibly consist of just one instrument.) • If the 7951 is part of a large installation...

Appendix C Technical data for the 7951 Page C.16 Earthing requirements for group 2 connections only The status inputs do not have to be earthed because the circuitry contains only opto-electrical components. Earthing requirements for group 3 connections only These depend on what sort of installation...

Appendix D Units and conversion factors Page D.1 Appendix D Units and conversion factors The figures in the following table are taken from BS 350: Part 1: March 1974: Parameter Imperial units Metric equivalent Length 1 inch 1 foot 25.4 mm 0.3048 m Mass 1 lb 1 ton 0.45359237 kg 1016.05 kg Density 1 l...

Appendix E Data tables Page E.1 Appendix E Data tables E.1 The tables Note : The equations used to derive these tables are given in Section E.2. Density/temperature relationship of crude oil Temp.(°C) Density (kg/m 3 ) 60 738.91 765.06 791.94 817.15 843.11 869.01 894.86 920.87 946.46 55 742.96 768.9...

Appendix E Data tables Page E.2 Platinum resistance law (To DIN 43 760) °C Ohms °C Ohms °C Ohms °C Ohms °C Ohms -220 10.41 -120 52.04 -20 92.13 80 130.89 180 168.47 -210 14.36 -110 56.13 -10 96.07 90 134.70 190 172.16 -200 18.53 -100 60.20 0 100.00 100 138.50 200 175.8 -190 22.78 -90 64.25 10 103.90...

Appendix E Data tables Page E.3 Velocity of Sound in Liquids The values for a selection of fluids are given below. You can obtain further details from reference books such as Tables of Physical and Chemical Constants and some Mathematical Functions by G W C Kaye and T H Laby. Liquid Temperature (t °...

Appendix E Data tables Page E.5 E.2. Equations used to derive data tables Density/temperature relationship The density/temperature relationship is: where: t ρ = density at line temperature t°C (kg/m 3 ) 15 ρ = density at base temperature 15°C (kg/m 3 ) t Δ = t°C -15°C (i.e. t - base temperature) 15 ...

Appendix E Data tables Page E.6 For practical purposes, when the liquid volume changes from 0 V to 1 V as the gauge pressure changes from zero (atmospheric) to 1 P , the above equation is simplified to: T 1 1 0 P V V 1 » ¼ º « ¬ ª ∂ − = β ISO Document TC 28/SC3/N248, (Generation of New Compressibili...

Appendix F Calculations and theory Page F.1 Appendix F Calculations and theory F.1 The VOS effect on density measurements This sub-section shows how the 795x gas flow computer software works out the velocity of sound factors that are used for correcting line density. Two methods are provided:- 1. Pr...

Appendix F Calculations and theory Page F.4 Equation F.1#3b: V.O.S. of the measured gas (pure of composition) for S.G. method Using: ( ) ¸ ¸¹ · ¨ ¨© § + − = C G G G C K C C K C * 1 * 1 1 τ τ Where: G C = V.O.S. of the measured gas (in m/s) C C = V.O.S. of the calibration gas (in m/s)……………………..……..{S...

Micro Motion ® 7951 Signal Converter Operating Manual HB511020, Rev. A November 2007 The Emerson logo is a trade mark and service mark of Emerson Electric Co. Micro Motion is a registered trademark of Micro Motion, Inc. All other marks are the property of their respective owners. We reserve the righ...