Emerson Rosemount 8750WB Bedienungsanleitung

Quick Start Guide

00825-0200-4750, Rev AA

February 2014

Rosemount 8750WB Magnetic Flowmeter

System

for Utility, Water, and Wastewater Applications

February 2014

Quick Start Guide

NOTICE

This document provides basic installation guidelines for the Rosemount® 8750W Magnetic

Flowmeter System. For comprehensive instructions, for detailed configuration, diagnostics,

maintenance, service, installation or troubleshooting, refer to the Rosemount 8750W

reference manual (document number 00809-0100-4750 Rev. BA). The manual and this QSG

are also available electronically on www.rosemount.com.

Failure to follow these installation guidelines could result in death or serious injury:

Installation and servicing instructions are for use by qualified personnel only. Do not perform

any servicing other than that contained in the operating instructions, unless qualified.

Verify that the operating environment of the sensor and transmitter is consistent with the

operating environment.

Do not connect a Rosemount transmitter to a non-Rosemount sensor that is located in an

explosive atmosphere.

The sensor liner is vulnerable to handling damage. Never place anything through the sensor

for the purpose of lifting or gaining leverage. Liner damage may render the sensor inoperable.

Metallic or spiral-wound gaskets should not be used as they will damage the liner face of the

sensor.

If frequent removal is anticipated, take precautions to protect the liner ends. Short spool

pieces attached to the sensor ends are often used for protection.

Rosemount Magnetic Flowmeters ordered with non-standard paint options may be subject to

electrostatic discharge. To avoid electrostatic charge build-up, do not rub the flowmeter with

a dry cloth or clean with solvents.

Correct flange bolt tightening is crucial for proper sensor operation and life. All bolts must be

tightened in the proper sequence to the specified torque specifications. Failure to observe

these instructions could result in severe damage to the sensor lining and possible sensor

replacement.

Contents

Pre-installation . . . . . . . . . . . . . .page 3

Handling . . . . . . . . . . . . . . . . . . .page 7

Mounting . . . . . . . . . . . . . . . . . .page 8

Installation . . . . . . . . . . . . . . . .page 10

Grounding . . . . . . . . . . . . . . . .page 15

Wiring . . . . . . . . . . . . . . . . . . . .page 17

Basic configuration . . . . . . . . .page 28

Quick Start Guide

February 2014

Step 1: Pre-installation

Before installing the Rosemount 8750W Flowmeter, there are several

pre-installation steps that should be completed to make the installation process

easier:

Identify the options and configurations that apply to your application

Set the hardware switches if necessary

Consider mechanical, electrical, and environmental requirements

Mechanical considerations

The mounting site for the Rosemount 8750W transmitter should provide enough

room for secure mounting, easy access to conduit ports, full opening of the

transmitter covers, and easy readability of the LOI screen (see Figure 1 and

Figure 2).

If the Rosemount 8750W transmitter is mounted separately from the sensor, it

may not be subject to the same limitations that apply to the sensor.

Figure 1. Field mount transmitter dimensional drawing

NOTICE

*Non- standard conduit entry thread. M20 connections are available with the use of threaded

conduit adapters.

5.82

(148)

6.48 (165)

7.49 (190)

LOI Cover

4.97

(126)

8.81

(224)

3.00

(76)

3.07

(78)

4.97

(126)

1/2”-14 NPT (3 places)*

1/2”-14 NPT (2 places)*

February 2014

Quick Start Guide

Figure 2. Wall mount transmitter dimensional drawing

4.31

(109)

LOI Keypad

Cover

9.01

(229)

11.15

(283)

2.81

(71)

3.11

(79)

12.02

(305)

0.44

(11)

Ground Lug

1/2–14 NPT

Conduit

Connection

(4 Places)

WITH STANDARD COVER

NOTE

Dimensions are in inches (millimeters)

2.96

(75)

WITH LOI COVER

Quick Start Guide

February 2014

Environmental considerations

To ensure maximum transmitter life, avoid extreme temperature and excessive

vibration. Typical problem areas:

high-vibration lines with integrally mounted transmitters

warm-climate installations in direct sunlight

outdoor installations in cold climates.

Remote-mounted transmitters may be installed in the control room to protect

the electronics from the harsh environment and provide easy access for

configuration or service.

Both remotely and integrally mounted Rosemount 8750W transmitters require

external power so there must be access to a suitable power source.

Installation procedures

Rosemount 8750W installation includes both detailed mechanical and electrical

installation procedures.

Mount the transmitter

At a remote site the transmitter may be mounted on a pipe up to two inches in

diameter or against a flat surface.

Pipe mounting

To mount the transmitter on a pipe:

1. Attach the mounting bracket to the pipe using the mounting hardware.

2. Attach the Rosemount 8750W transmitter to the mounting bracket using the

mounting screws.

Identify options and configurations

The standard application of the 8750W includes a 4–20 mA output and control of

the sensor coils and electrodes. Other applications may require one or more of

the following configurations or options:

HART Multidrop Configuration

Discrete Output

Discrete Input

Pulse Output

Be sure to identify any additional options and configurations that apply to the

installation. Keep a list of these options nearby for consideration during the

installation and configuration procedures.

February 2014

Quick Start Guide

Hardware jumpers/switches

The 8750W electronics board is equipped with user-selectable hardware switches

depending on the transmitter model ordered. These switches set the Failure

Alarm Mode, Internal/External Analog Power, Internal/External Pulse Power and

Transmitter Security. The standard configuration for these switches when

shipped from the factory is as follows:

Changing hardware switch settings

In most cases, it will not be necessary to change the setting of the hardware

switches. If the switch settings need to be changed, follow the steps outlined in

the manual.

Electrical considerations

Before making any electrical connections to the Rosemount 8750W, consider

national, local and plant electrical installation requirements. Be sure to have the

proper power supply, conduit, and other accessories necessary to comply with

these standards.

Rotate transmitter housing

The Field Mount transmitter housing can be rotated on the sensor in 90°

increments by removing the four mounting bolts on the bottom of the housing.

Do not rotate the housing more than 180 ° in any one direction. Prior to

tightening, be sure the mating surfaces are clean, the O-ring is seated in the

groove, and there is no gap between the housing and the sensor.

Failure Alarm Mode: HIGH

Internal/External Analog Power: INTERNAL

Internal/External Pulse Power: EXTERNAL (Field Mount only)

Transmitter Security: OFF

Use a non-metallic tool to move switch positions.

Quick Start Guide

February 2014

Step 2: Handling

Handle all parts carefully to prevent damage. Whenever possible, transport the

system to the installation site in the original shipping containers. Rosemount flow

sensors are shipped with end covers that protect it from mechanical damage. For

PTFE lined sensors the cover also prevents normal liner relaxation. Remove the

end covers just before installation.

Figure 3. Rosemount 8750W flanged sensor support for handling

½- through 4-Inch Sensors 5-Inch and Lar

er Sensors

February 2014

Quick Start Guide

Step 3: Mounting

Upstream/downstream piping

To ensure specification accuracy over widely varying process conditions, install

the sensor a minimum of five straight pipe diameters upstream and two pipe

diameters downstream from the electrode plane (see Figure 4).

Figure 4. Upstream and downstream straight pipe diameters

Installations with reduced upstream and downstream straight runs are possible.

In reduced straight run installations, absolute performance may shift. Reported

flow rates will still be highly repeatable.

The sensor should be mounted so the FORWARD end of the flow arrow points in

the direction of flow through the sensor (see Figure 5).

Figure 5. Flow direction

5 Pipe Diameters 2 Pipe Diameters

Flow

Quick Start Guide

February 2014

The sensor should be installed in a location that ensures it remains full during

operation. Vertical installation with upward process fluid flow keeps the

cross-sectional area full, regardless of flow rate. Horizontal installation should be

restricted to low piping sections that are normally full.

Figure 6. Sensor orientation

Mounting position

The electrodes in the sensor are properly orientated when the two measurement

electrodes are in the 3 and 9 o’clock position or within 45 ° from the vertical, as

shown on the right of Figure 7. Avoid any mounting orientation where the two

measurement electrodes are in the 6 and 12 o’clock position as shown on the left

of Figure 7.

Figure 7. Sensor mounting position

FLOW

Incorrect Correct

February 2014

Quick Start Guide

Step 4: Installation

Flanged sensors

Gaskets

The sensor requires a gasket at each of its connections to adjacent devices or piping.

The gasket material selected must be compatible with the process fluid and operating

conditions. Gaskets are required on each side of a grounding ring. All other

applications (including sensors with lining protectors or a grounding electrode)

require only one gasket on each end connection.

Figure 8. Flanged gasket placement

Metallic or spiral-wound gaskets should not be used as they will damage the liner face of the

sensor. If spiral wound or metallic gaskets are required for the application, lining protectors

must be used.

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