Emerson Rosemount 248 Bedienungsanleitung

Quick Start Guide

00825-0200-4825, Rev EA

February 2021

Rosemount™ 248 Head Mount

Temperature Transmitter

Contents

About this guide...........................................................................................................................3

Configuration...............................................................................................................................5

Mount the transmitter..................................................................................................................7

Connect the wiring.....................................................................................................................11

Perform a loop test.....................................................................................................................16

Certified installations................................................................................................................. 17

Product certifications................................................................................................................. 18

Quick Start Guide February 2021

1 About this guide

This guide provides basic guidelines to install the Rosemount 248 Head

Mount Temperature Transmitter. It does not provide instructions for

detailed configuration, diagnostics, maintenance, service, troubleshooting,

or installations. Refer to the Rosemount 248 Temperature Transmitter

Reference Manual for more instruction. The manual and this guide are also

available electronically at Emerson.com/Rosemount.

1.1 Safety messages

WARNING

Explosions

Explosions could result in death or serious injury.

Installation of device in an explosive environment must be in accordance

with appropriate local, national, and international standards, codes, and

practices.

Review the Hazardous Locations Certifications for any restrictions

associated with a safe installation.

Process leaks

Process leaks could result in death or serious injury.

Install and tighten thermowells and sensors before applying pressure.

Do not remove the thermowell while in operation.

Electrical shock

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals. High voltage that may be

present on leads can cause electrical shock.

Unless marked, the conduit/cable entries in the housing use a ½–14 NPT

thread form. Entries marked “M20” are M20 × 1.5 thread form. On

devices with multiple conduit entries, all entries will have the same

thread form. Only use plugs, adapters, glands, or conduit with a

compatible thread form when closing these entries.

When installing in a hazardous location, use only appropriately listed or

Ex certified plugs, glands, or adapters in cable/conduit entries.

February 2021 Quick Start Guide

Quick Start Guide 3

WARNING

Physical access

Unauthorized personnel may potentially cause significant damage to and/or

misconfiguration of end users’ equipment. This could be intentional or

unintentional and needs to be protected against.

Physical security is an important part of any security program and

fundamental to protecting your system. Restrict physical access by

unauthorized personnel to protect end users’ assets. This is true for all

systems used within the facility.

Quick Start Guide February 2021

2 Configuration

2.1 Bench calibration

There are three ways to configure the transmitter:

•Field Communicator

•Rosemount 248 PC Programming Kit

•Custom at the factory using the C1 option code

Refer to the Rosemount 248 Reference Manual and the Field Communicator

User Guide for more information.

Connecting a field communicator

The Field Communicator Field Device Revision Dev v1, DD v1or later is

required for complete functionality.

Figure 2-1: Connecting a Field Communicator to a Bench Loop

A. Rosemount 248 Transmitter

B. 250 Ω ≤ RL ≤ Ω 1100

C. Field Communicator

D. Power supply

E. Recorder (optional)

F. Ammeter (optional)

Note

Do not operate when power is below 12 Vdc at the transmitter terminal.

February 2021 Quick Start Guide

Quick Start Guide 5

2.2 Verify transmitter configuration

To verify operation using a Field Communicator, refer to the Rosemount 248

Reference Manual for more detailed description.

2.3 Install PC programmer kit (HART® 5 only)

Procedure

1. Install all necessary software for PC configuration:

a) Install the Rosemount 248C software

1. Place the CD-Rom in the drive.

2. Run setup.exe from Windows™ 7, 8, 10, or XP.

b) Install the MACTek® HART modem drivers completely before

beginning bench configuration with the Rosemount 248 PC

Programming system.

Note

For USB modem: Upon first use, configure appropriate COM ports

within the Rosemount 248 PC software by selecting Port Settings

from the Communicate menu. The USB modem driver emulates a

COM port and will add to available port selections in the software’s

drop-down box. Otherwise software defaults to first available COM

port, which may not be correct.

2. Set up configuration system hardware:

a) Hook up the transmitter and load resistor (250-1100 ohms)

wired in series with the power supply.

The device will need an external power supply of 12-42.4 Vdc

for configuration.

b) Attach the HART modem in parallel with the load resistor and

connect it to the PC.

2.3.1 Spares kit and re-order numbers

Table 2-1: Programming Kit Spare Part Numbers

Product description Part number

Programming software (CD) 00248-1603-0002

Rosemount 248 Programmer Kit - USB 00248-1603-0003

Rosemount 248 Programmer Kit - Serial 00248-1603-0004

For more information, refer to the Rosemount 248 Reference Manual.

Quick Start Guide February 2021

3 Mount the transmitter

3.1 Overview

Mount the transmitter at a high point in the conduit run to prevent moisture

from draining into the transmitter housing.

3.2 Typical European and Asia Pacific installation

Head mount transmitter with DIN plate style sensor

Procedure

1. Attach the thermowell to the pipe or process container wall. Install

and tighten thermowells before applying process pressure.

2. Assemble the transmitter to the sensor.

a) Push the transmitter mounting screws through the sensor

mounting plate.

3. Wire the sensor to the transmitter.

4. Insert the transmitter-sensor assembly into the connection head.

a) Thread the transmitter mounting screw into the connection

head mounting holes.

b) Assemble the extension to the connection head.

c) Insert the assembly into the thermowell.

5. Slip the shielded cable though the cable gland.

6. Attach a cable gland into the shielded cable.

7. Insert the shielded cable leads into the connection head through the

cable entry. Connect and tighten the cable gland.

8. Connect the shielded power cable leads to the transmitter power

terminals. Avoid contact with sensor leads and sensor connections.

9. Install and tighten the connection head cover. Enclosure covers must

be fully engaged to meet explosion-proof requirements.

February 2021 Quick Start Guide

Quick Start Guide 7

Figure 3-1: Typical European and Asia Pacific Installation

A. Transmitter mounting screws

B. Rosemount 248 Transmitter

C. Integral mount sensor with flying leads

D. Connection head

E. Extension

F. Thermowell

3.3 Typical North and South American installation

Head mount transmitter with threaded sensor

Procedure

1. Attach the thermowell to the pipe or process container wall. Install

and tighten the thermowell before applying process pressure.

2. Attach necessary extension nipples and adapters to the thermowell.

3. Seal the nipple and adapter threads with silicone tape.

4. Screw the sensor into the thermowell. Install drain seals if required

for severe environments or to satisfy code requirements.

5. Pull the sensor wiring leads through the universal head and

transmitter.

6. Mount the transmitter in the universal head by threading the

transmitter mounting screws into the universal head mounting

holes.

7. Mount the transmitter-sensor assembly into the thermowell. Seal

adapter threads with silicone tape.

8. Install conduit for field wiring to the conduit entry of the universal

head. Seal conduit threads with silicone tape.

9. Pull the field wiring leads through the conduit into the universal

head.

10. Attach the sensor and power leads to the transmitter. Avoid contact

with other terminals.

11. Install and tighten the universal head cover.

Quick Start Guide February 2021

Note

Enclosure covers must be fully engaged to meet explosion-proof

requirements.

Figure 3-2: Typical North and South American Installation

A. Threaded thermowell

B. Standard extension

C. Threaded style sensor

D. Universal head

E. Conduit entry

3.4 Mounting to a DIN rail

Procedure

•To attach a head mount transmitter to a DIN rail, assemble the

appropriate rail mounting kit (part number 00248-1601-0001) .

Figure 3-3: Assembling Rail Clip Hardware

A. Mounting hardware

B. Transmitter

C. Rail clip

February 2021 Quick Start Guide

Quick Start Guide 9

3.4.1 Rail mount transmitter with remote mount sensor

The least complicated assembly uses:

•a remote mounted transmitter

•an integral mount sensor with terminal block

•an integral style connection head

•a standard extension

•a threaded thermowell

Refer to the Metric Sensor Product Data Sheet for complete sensor and

mounting accessory information.

3.4.2 Rail mount transmitter with threaded sensor

The least complicated assembly uses:

•a threaded sensor with flying heads

•a threaded sensor connection head

•a union and nipple extension assembly

•a threaded thermowell

Refer to Rosemount Sensor Product Data Sheet for complete sensor and

mounting accessory information.

Quick Start Guide February 2021

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