How it Works
Emerson
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Rosemount 248
Quick Start Guide
36 pgs2.18 Mb0
Reference Manual
60 pgs1.79 Mb0
Reference Manual
58 pgs3.09 Mb0
Table of contents
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Emerson Rosemount 248 Quick Start Guide

00825-0200-4825, Rev EA
Rosemount™ 248 Head Mount Temperature Transmitter
Quick Start Guide
February 2021
Contents
2

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.
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.
4

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.
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.
6

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.
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.
8
C
B
A
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
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.
10

4 Connect the wiring

4.1 Diagrams and power

• Wiring diagrams are located on the top label of the transmitter.
• An external power supply is required to operate the transmitter.
• The power required across the transmitter power terminals is 12 to 42.4
Vdc (the power terminals are rated to 42.4 Vdc).
Note
To prevent damaging the transmitter, do not allow terminal voltage to drop below 12.0 Vdc when changing the configuration parameters.

4.1.1 Power the transmitter

Procedure
1. Connect the positive power lead to the “+” terminal.
2. Connect the negative power lead to the “–” terminal.
3. Tighten the terminal screws.
4. Apply power (12–42 Vdc).
Figure 4-1: Power, Communication, and Sensor Terminals
A. Sensor terminals B. Power/communication terminals

4.1.2 Ground the transmitter

Ungrounded thermocouple, mV, and RTD/Ohm inputs
Each process installation has different requirements for grounding. Use the grounding options recommended by the facility for the specific sensor type, or begin with grounding Option 1 (the most common).
Quick Start Guide 11
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