Emerson Micro Motion 7835 Bedienungsanleitung

Installation Manual

MMI-20020999, Rev AC

May 2018

Micro Motion® Compact Density Meter (CDM)

7835/7845 Liquid Density Meter Retrofit Installation

Safety and approval information

This Micro Motion product complies with all applicable European directives when properly installed in accordance with the

instructions in this manual. Refer to the EU declaration of conformity for directives that apply to this product. The EU declaration of

conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available on

the internet at www.emerson.com or through your local Micro Motion support center.

Information affixed to equipment that complies with the Pressure Equipment Directive, can be found on the internet at

www.emerson.com.

For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.

Other information

Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the configuration

manual. Product data sheets and manuals are available from the Micro Motion web site at www.emerson.com.

Return policy

Follow Micro Motion procedures when returning equipment. These procedures ensure legal compliance with government

transportation agencies and help provide a safe working environment for Micro Motion employees. Micro Motion will not accept

your returned equipment if you fail to follow Micro Motion procedures.

Return procedures and forms are available on our web support site at www.emerson.com, or by phoning the Micro Motion Customer

Service department.

Emerson Flow customer service

Email:

•Worldwide: [email protected]

•Asia-Pacific: [email protected]

Telephone:

North and South America Europe and Middle East Asia Pacific

United States 800-522-6277 U.K. 0870 240 1978 Australia 800 158 727

Canada +1 303-527-5200 The Netherlands +31 (0) 704 136 666 New Zealand 099 128 804

Mexico +41 (0) 41 7686 111 France 0800 917 901 India 800 440 1468

Argentina +54 11 4837 7000 Germany 0800 182 5347 Pakistan 888 550 2682

Brazil +55 15 3413 8000 Italy 8008 77334 China +86 21 2892 9000

Central & Eastern +41 (0) 41 7686 111 Japan +81 3 5769 6803

Russia/CIS +7 495 981 9811 South Korea +82 2 3438 4600

Egypt 0800 000 0015 Singapore +65 6 777 8211

Oman 800 70101 Thailand 001 800 441 6426

Qatar 431 0044 Malaysia 800 814 008

Kuwait 663 299 01

South Africa 800 991 390

Saudi Arabia 800 844 9564

UAE 800 0444 0684

Contents

Chapter 1 Planning ...........................................................................................................................1

1.1 Retrofit installation overview ..........................................................................................................1

1.2 Installation checklist .......................................................................................................................1

1.3 Best practices ................................................................................................................................. 2

1.4 Pressure drop in the meter ............................................................................................................. 3

1.5 Power requirements .......................................................................................................................5

1.6 Spacing requirements .................................................................................................................... 9

1.7 Perform a pre-installation meter check .........................................................................................11

Chapter 2 Removing a 7835/7845 meter ........................................................................................ 12

2.1 Disconnect the 7835/7845 meter wiring ......................................................................................12

2.2 Remove the meter from the pipeline ............................................................................................14

Chapter 3 Mounting .......................................................................................................................15

3.1 Mount the meter ..........................................................................................................................15

3.2 Rotate the electronics on the meter (optional) .............................................................................16

3.3 Rotate the display on the transmitter (optional) ...........................................................................17

Chapter 4 Wiring ........................................................................................................................... 19

4.1 Wiring to external devices (HART multidrop) ................................................................................19

4.2 Terminals and wiring requirements .............................................................................................. 19

4.3 Retrofit wiring: terminal-to-output conversions ........................................................................... 20

4.4 Explosion-proof/flameproof or non-hazardous output wiring .......................................................22

4.5 Intrinsically safe output wiring ......................................................................................................26

4.6 Processor wiring for remote-mount 2700 FOUNDATION™ fieldbus option ....................................34

4.7 Wiring to signal converters and/or flow computers ...................................................................... 39

Chapter 5 Grounding ......................................................................................................................42

Contents

Installation Manual i

Contents

ii Micro Motion Compact Density Meter 7835/7845 Retrofit

1 Planning

Topics covered in this chapter:

•Retrofit installation overview

•Installation checklist

•Best practices

•Pressure drop in the meter

•Power requirements

•Spacing requirements

•Perform a pre-installation meter check

1.1 Retrofit installation overview

Following is an overview of the tasks required to install the Compact Density Meter (CDM)

as a replacement to the Micro Motion 7835/7845 liquid density meter. We recommend

that you review this information before beginning the retrofit installation.

Process Reference

Confirm you have all parts necessary and meet the basic installa-

tion requirements.

See Section 1.2

Consider the installation best practices for the removal and in-

stallation of your meter(s).

See Section 1.3

Confirm any additional wiring, external power supplies, and/or

resistance needed to wire to the CDM.

See Chapter 4

Remove the existing 7835/7845 liquid density meter. See Chapter 2

Mount the CDM retrofit meter. See Chapter 3

Wire the meter according to the recommended practices for

your process environment and required approvals.

See Chapter 4

Ground the meter. See Grounding

1.2 Installation checklist

□Make sure that the hazardous area specified on the approval tag is suitable for the

environment in which the meter will be installed.

□Verify that the local ambient and process temperatures are within the limits of the

meter.

□Verify the spacing requirements for the retrofit meter installation (see Section 1.6).

Planning

Installation Manual 1

□Verify the retrofit wiring requirements, which may vary depending on your existing

transmitter configuration:

-Confirm the CDM input/output wiring requirements (see Chapter 4).

Tip

Depending on your current configuration, you may need additional wiring or can reuse

wiring that had been connected to devices no longer needed.

-For intrinsically safe hazardous area installations, you must purchase new barriers

or isolators. You cannot reuse existing safety barriers or galvanic isolators for

connecting to the CDM.

Tip

Micro Motion provides safety barrier and galvanic isolator installation kits for wiring the

CDM in a hazardous environment. These kits provide the appropriate barriers or isolators

depending on the outputs available and approvals required. Contact

[email protected] for more information on ordering these kits.

□If your meter will be wired to a remote-mount 2700 FOUNDATION™ fieldbus

transmitter:

-Refer to the instructions in this manual for preparing the 4-wire cable and wiring

to the processor connections. See Section 4.6.

-Refer to the instructions in the transmitter installation manual for mounting and

wiring the 2700 FOUNDATION™ fieldbus transmitter.

-Consider the maximum cable length between the meter and transmitter. The

maximum recommended distance between the two devices is 1000 ft (300 m).

Micro Motion recommends using Micro Motion cable.

□Install the meter so that the flow direction arrow on the meter case matches the

actual forward flow of the process. (Flow direction is also software-selectable.)

□For optimal performance, thermally insulate the meter and the inlet and bypass-

loop pipeline to maintain stable temperatures.

Tip

Micro Motion offers a soft, weather-proof insulating jacket that is easily fitted to all CDM

versions.

1.3 Best practices

The following information can help you get the most from your meter.

•Handle the meter with care. Follow local practices for lifting or moving the meter.

•Perform a Known Density Verification (KDV) check of the meter prior to installing

the meter in your system.

•Install the meter in the preferred orientation in a vertical pipeline with liquids and

slurries flowing upward.

Planning

2Micro Motion Compact Density Meter 7835/7845 Retrofit

Important

If you do not install the meter in the preferred orientation, you may need to apply a field

offset to ensure optimal performance. Refer to your organizational standards for sampling

and reference measurement to determine what the offset may be.

•If you are installing the meter into an application configuration requiring differential

pressure, confirm the current configuration is suitable for the CDM.

•Do not apply a compression force greater than 200 lbs (90.7 kg) when installing the

meter.

•Thermally insulate the meter and the inlet and bypass-loop pipeline to maintain

stable temperatures.

•There are no pipe run requirements for Micro Motion meters. Straight runs of pipe

upstream or downstream are unnecessary.

•Keep the meter tubes full of process fluid.

•For halting flow through the meter with a single valve, install the valve downstream

from the meter.

•Minimize bending and torsional stress on the meter. Do not use the meter to align

misaligned piping.

•The meter does not require external supports. The flanges will support the meter in

any orientation.

•For bypass configurations using a pump, install the pump downstream of the meter

to avoid pump heat transfer.

•For bypass configurations, maintain a target flow through the meter to ensure

sample integrity and consistent temperature with the main line.

1.4 Pressure drop in the meter

The pressure drop in the meter depends on the process conditions. The following figures

illustrate the pressure drop for the meter at varying fluid density and viscosity. In addition,

these charts show how the meter compares to the Micro Motion 7835/7845 liquid density

meters.

Important

For the most accurate pressure drop calculations using your process variables, use the Micro Motion

product selector available at www.emerson.com.

Planning

Installation Manual 3

Sample pressure drop calculations (fluid viscosity equals 2 cP)Figure 1-1:

A. Pressure drop (bar)

B. Flow rate (m3/hr)

Note

•Density = 800 kg/m3

•Viscosity = 2 cP

Planning

4Micro Motion Compact Density Meter 7835/7845 Retrofit

Sample pressure drop calculations (fluid viscosity equals 10 cP)Figure 1-2:

A. Pressure drop (bar)

B. Flow rate (m3/hr)

Note

•Density = 800 kg/m3

•Viscosity = 10 cP

1.5 Power requirements

Following are the DC power requirements to operate the meter:

•Explosion-proof/flameproof meters:

-24 VDC, 0.65 W typical, 1.1 W maximum

-Minimum recommended voltage: 21.6 VDC with 1000 ft of 24 AWG (300 m of

0.20 mm2) power-supply cable

-At startup, power source must provide a minimum of 0.5 A of short-term current

at a minimum of 19.6 V at the power-input terminals.

•Intrinsically safe meters:

-24 VDC, 0.7 W typical with 250 Ω barrier, 0.96 W maximum with 250 Ω barrier

-Minimum recommended voltage: 22.8 VDC with 1000 ft of 22 AWG (300 m of

0.25 mm2) power-supply cable

Planning

Installation Manual 5

Power cable recommendations for explosion-proof/flameproof meters

Minimum wire gauge (AWG per feet )Figure 1-3:

300ft 600ft 900ft 1200ft 1500ft 1800ft 2100ft 2400ft 2700ft 3000ft

2 1 . 6V

24 V

91.44m 182.88m 274.32m 365.76m 457.2m 548.64m 640.08m 731.52m 822.96m 914.4m

A. AWG maximum

B. Distance of installation

Planning

6Micro Motion Compact Density Meter 7835/7845 Retrofit

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