Emerson Rosemount 248 Manuale utente
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
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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.
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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.
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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.
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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
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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.
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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.
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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
C
B
A
A. Mounting hardware
B. Transmitter
C. Rail clip
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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
10
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