Micro Motion Manuals & Guides: Signal Converter With Gas Sotware - Model 7951

®

r

Operating Manual

MMI-20019472, Rev. AA April 2011

7951 Signal Converter

(With gas software 1020)

Klippon Connector Model

D-Type Connector Model

Micro Motion

7951 Signal Converte

Introduction

The Micro Motion used for dual-channel/stream gas applications.

Software Version: 1020 – Gas Applications.

Models Covered

7951MAA0*****

Models Covered

7951MAB0*****

:

®

7951 Signal Converter can be

:

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 2.11

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 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.

• 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.

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 refe r to al l members of the 795x family (7950 and 7951).

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 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:

• Example 1: 7951 with a 7810/11/12 (See page 2.2)

• Example 2: 7951 with a 3098 Gas Specific Gravity (See page 2.6)

• Example 3: 7951 with a mA-type temperature transmitter (See page 2.9)

• Example 4: 7951 with a mA-type pressure transmitter (See page 2.12)

• Example 5: 7951 with a RTD-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:

• wire up a simple system

• set the DIP switches inside the 7951

• 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 button in 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 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 clear ed 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 7812 gas density meter

About this example

This NON-HAZARDOUS (SAFE) AREA ONLY INSTALLATION† example shows you how to connect either a 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:

• 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.

Connect the meter

1. Wire the meter to the 7951, as in:

Figure 2.1 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 cove r 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.

7812

7951

Klippon D-type

1

SIG A

2 3

SIG B

4

+24V Power

Signal +

0V

Power

Signal -

PL5/9 PL5/1 PL5/10 PL5/2

SK6/22 SK6/14 SK6/24 SK6/15

Figure 2.1: Safe area wiring for a 7812 (3-wire arrangement)

Turn on the 3. Turn on the power to the system. The system goes through a Power On Self Test

†

Hazardous area considerations: Refer to meter documentation for details of Intrinsically Safe Barrier/Isolator requirements.

Page 2.2

Chapter 2 Getting started

power (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

Clear existing configuration

(This is optional)

Select the wizard 12. Press the b-button then the UP-ARROW or DOWN-ARROW button to scroll through

Start of wizard 14. Press the d-button to answer YES to “Edit Gas density A?” Enter

densitometer calibration factors

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”.

the option list until “Density 1” is shown.

13. Press the b-button to select “Density 1”.

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 2.3 on page 2.4 shows where to find the K0, K1 and K2 factors on a calibration certificate. Always shipped with the connected meter.

use values from the calibration certificate that was

Enter temperature correction factors

Skip over the next few questions

View how you have configured Line density

18. Press b-button to start the correction selection process.

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.

24. Press the MENU button.

25. Press the a-button twice. The display looks similar to that shown in Figure 2.2, although values and titles shown may vary.

Page 2.3

Chapter 2 Getting started

Figure 2.2: 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

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

A

X

L

E

O

N

G = ------------------------- -- -- --

USER GAS OFFSET DATA

Nitrogen/Methane Gas Mixture Over Density Range 10 to 60 KG/M3

( K3 ( G ) ) K3 = 354

DA = Dt ( 1 + ----------- ( 0.00236 - ----------- ) ) K4 = 57.4

O

( (Dt+K4) ( t+273 ) )

where

F

= Periodic Time (uS)

T

= Actual Density (KG/M3)

DA

= Temperature (DEG. C)

t

= Indicated Density (KG/M3)

DI

= Temp. Corrected Density (KG/M3)

Dt

R

Calibration Date:

DENSITY = K0 +K1.T + K2.T**2 K0 = -1.104252E+02

K1 = -1.882012E-02 K2 = 4.749797E+04

M

Y

K19 = 8.44E-04

Gas Specific Gravity

Ratio of Specific Heats

FINAL TEST &

INSPECTION

Serial No:

Cylinder No:

Amplifier No:

P

L

123456

123456 123456

14JUL97

E

Page 2.4

Ref No: GD04/V1.5

Figure 2.3: Circled areas on an example calibration certificate showing where to find

values for K0, K1, K2, K18 and K19.

DATE14JUL97

View the Multiview display

Chapter 2 Getting started

26. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure

2.4, 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

End of Worked Example 1

a

b c d

a

b c d

V

Density 0.000

Invalid Multiview Page

Figure 2.4: Multi-view display

Page 2.5

Chapter 2 Getting started

r

2.5 Example 2: 7951 with a 3098 Gas Specific Gravity Meter

About this example

This example shows you how to connect a 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:

• A single 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.

Page 2.6

3098 7951

Klippon D-type

ohms

40

1

3 2

+

Sig

Neg

4

(24V) Powe

Signal +

Signal -

(0V) Power -

+

PL5/9 PL5/5

PL5/6 PL5/10

SK 6 / 22 SK 6 / 18

SK 6 / 19

SK 6 / 24

Figure 2.5: Non-hazardous (Safe) area wiring for a 3098

3098

r

Barrier as defined in the

latest

specification

3098

Klippon

Chapter 2 Getting started

7951

D-type

1 2

3

+

Sig Neg

3 4

Intrinsically Safe Earth

1 2

(24v) Powe

Signal +

Signal -

(0v) Powe

+

-

PL5/9 PL5/5

PL5/6 PL5/10

SK 6 /22 SK 6 /18 SK 6 /19

SK 6 /24

Figure 2.6: Hazardous area wiring for a 3098

Turn on the power

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.

Go to the wizards menu

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.

Clear existing configuration

(This is optional)

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 2.7 although values shown may vary.

Page 2.7

Chapter 2 Getting started

Figure 2.7: Prime Specific Gravity display

View the Multiview

22. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.8, although values and titles shown may vary.

display

From Multi-view key

a

b c d

a

b c d

V

Density 0.000

Invalid Multiview Page

Figure 2.8: Multi-View display

End of Worked Example 2

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:

• 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

Set DIP switch 3. Ensure that the DIP-switch, inside the 7951, is set as shown below.

1. Wire the temperature transmitter to the 7951, as in Figure 2.9

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.

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 2.9: DIP-switch and safe area wiring for a m A-type temperature transmitter

Page 2.9

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 al arm lights which 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 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.

Clear existing configuration

(This is optional)

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”.

Select the wizard

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”.

Start of wizard 15. Press the d-button to answer YES to the question “Edit Line Temperature?”. Choose the

Analogue Input

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

19. Press the ENTER button to keep the default selection of a 4-20mA type input.

of Analogue Input

Set Analogue 0% and 100%

20. Press the b-button.

21. Type in a suitable maximum temperature value and then press the ENTER button.

range

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.

Make the Analogue Input “live”

Skip over the next few

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.

questions View how you

have configured Line temperature

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 2.10 although values shown may vary.

Page 2.10

Chapter 2 Getting started

Figure 2.10: Line temperature data display

End of Worked Example 3

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:

• 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 2.11.

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 2.11 .

Loop-powered

7951

4-20mA pressure

transmitter

+

Power + Signal +

-

Signal -

Power -

Klippon D-type

PL9/5 PL8/2

PL8/3 PL9/8

4

4-20mA

3

2

1

SK8/24 SK8/2

SK8/3

SK8/25

D

C

B

A

PRT

Notes:

1. Specified 7951 pins are for Analogue Input 3.

2. DIP-switch position 3 must be set to 4-20mA.

Figure 2.11: DIP-switch and safe area wiring for a m A-type pressure transmitter

Page 2.12

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 al arm lights which may appear.

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

23. Type in a suitable minimum pressure value and then press the ENTER button.

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

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 2.12 although values shown may vary.

Figure 2.12: Line pressure data display

End of Worked Example 4

Page 2.13

Chapter 2 Getting started

2.8 Example 5: 7951 with a RTD-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:

• 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 2.13.

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 cove r 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.

Page 2.14

Set DIP switch 3. Set DIP-switch position 1 to “RTD” (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

4-20mA

SK7/14 SK7/15

SK7/16

SK7/17

4

3

2

1

D

C

B

A

Notes:

1. Specified 7951 pins are for Analogue Input 1.

2. DIP-switch position 1 must be set to PRT.

Figure 2.13: DIP switch and safe area wiring for a RTD-type temperature transmitter

PRT

Turn on the power

Chapter 2 Getting started

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

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

Choose the type of Analogue Input

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”.

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 RTD-type input.

Make the Analogue Input Channel “live”

Skip over other questions

View how you have configured Line temperature

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 2.14 although values shown may vary.

Figure 2.14: Line temperature display

End of Worked Example 5

Page 2.15

Chapter 2 Getting started

Page 2.16

3. About the Micro Motion

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

®

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 signal s from one fo rma t 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 acce pted 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 w ith a

It can also ob tain:

• 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

D-type connectors

Or...

SK1

Connector Board

Mother Board

SK2

SK3

PL1

SK4 SK5 SK6 SK7 SK8

Keyboard and display

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.

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

Alarm

Frequency

Analogue outputs

4-20mA

Printer

MODBUS communications to and from host com

uter

Figure 3.2: Typical installation for A Gas Signal Converter system

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 IF ICE 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

4. What you can connect to a 7951

The information in this chapter has been moved to Appendix C.

Chapter 4 What you can connect to a 7951

Page 4.1

Micro Motion Manuals & Guides: Signal Converter With Gas Sotware - Model 7951 | Micro Motion Manuals & Guides

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

1. About this manual

1.1 What this manual tells you

1.2 Who should use this manual

1.3 Software version covered by this manual

3.1 Background

3.2 What the 7951 Dual Channel Gas Signal Converter does

3.3 Physical description of the 7951

3.4 Communications

3.5 Typical installations

3.6 Checking your software version

4. What you can connect to a 7951