Emerson Rosemount 644 Manuale utente
Quick Start Guide
00825-0200-4728, Rev LC
April2023
Rosemount™ 644 Temperature
Transmitter
with 4–20 mA HART® Protocol (Revision
5 and 7)
Contents
About this guide...........................................................................................................................3
System readiness......................................................................................................................... 5
Transmitter installation...............................................................................................................6
Safety instrumented systems...................................................................................................24
Product certifications................................................................................................................ 25
Declaration of Conformity........................................................................................................ 44
China RoHS................................................................................................................................. 48
Quick Start Guide April2023
2 Rosemount 644
1 About this guide
This guide provides basic guidelines for installing the Rosemount
644 Temperature Transmitter. It does not provide instructions
for detailed configuration, diagnostics, maintenance, service,
troubleshooting, or installation. Refer to the Rosemount 644
Reference Manual for more instruction. The manual and this guide
are also available electronically on Emerson.com/Rosemount.
Safety messages
WARNING
The products described in this document are NOT designed for
nuclear-qualified applications.
Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate
readings.
For information on Emerson nuclear-qualified products, contact your
local Emerson Sales Representative.
Follow instructions
Failure to follow these installation guidelines could result in death or
serious injury.
Ensure only qualified personnel perform the installation.
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 in protecting your system. Restrict physical access by
unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
April2023 Quick Start Guide
Quick Start Guide 3
WARNING
Explosions
Explosions could result in death or serious injury.
Installation of the transmitters in a hazardous environment must
be in accordance with the appropriate local, national, and
international standards, codes, and practices. Kindly review the
Product Certifications section for any restrictions associated with
a safe installation.
Do not remove the connection head cover in explosive
atmospheres when the circuit is live.
Before connecting a handheld communicator in an explosive
atmosphere, ensure that the instruments are installed in
accordance with intrinsically safe or non-incendive field wiring
practices. Verify the operating atmosphere of the transmitter is
consistent with the appropriate hazardous locations certifications.
All connection head covers must be fully engaged to meet
explosion-proof requirements.
Process leaks
Process leaks could result in death or serious injury.
Do not remove the thermowell while in operation.
Install and tighten thermowells and sensors before applying
pressure.
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.
CAUTION
Conduit/cable entries
Unless otherwise marked, the conduit/cable entries in the
housing enclosure use a ½–14 NPT form. Only use plugs,
adapters, glands, or conduit with a compatible thread form when
closing these entries.
Entries marked "M20" are M20 x 1.5 thread form.
When installing in a hazardous location, use only appropriately
listed or Ex certified plugs, glands, or adapters in cable/conduit
entries.
Quick Start Guide April2023
4 Rosemount 644
2 System readiness
2.1 Confirm HART® revision capability
If using HART-based control or asset management systems, confirm
the HART capability of those systems prior to transmitter installation.
Not all systems are capable of communicating with HART Revision 7
Protocol. You can configure the transmitter for either HART Revision
5 or 7.
2.2 Confirm correct device driver
Procedure
1. Verify the latest Device Driver files are loaded on your systems
to ensure proper communications.
2. Download the latest Device Driver at Emerson.com/Device-
Install-Kits/Device-Install-Kit-Search
Table 2-1 provides the information necessary to ensure the
correct Device Driver files and documentation are being used.
Table 2-1: Device Revisions and Files
Software
date
NAMUR
Software
revision
HART®
Software
revision
HART
Universal
revision(1)
Device
revision(2)
Manual
Document
Number
Changes
to
Software(3)
June 2012 1.1.1 3 5 8 00809-010
0-4728
See (3) for
list of
changes.
7 9
(1) NAMUR software revision is located on the hardware tag of the device. HART
software revision can be read using a HART communication tool.
(2) Device Driver file names use Device and DD Revision (e.g. 10_01. HART Protocol)
is designed to enable legacy device driver revisions to continue to communicate
with new HART devices. To access new functionality, download the new Device
Driver. Emerson recommends downloading new Device Driver files to ensure full
functionality.
(3) HART Revision 5 and 7 Selectable, Dual Sensor support, Safety Certified, Advanced
Diagnostics (if ordered), Enhanced Accuracy and Stability (if ordered).
April2023 Quick Start Guide
Quick Start Guide 5
3 Transmitter installation
3.1 Mount the transmitter
Mount the transmitter at a high point in the conduit run to prevent
moisture from draining into the transmitter housing.
3.1.1 Head mount transmitter with DIN plate style sensor
installation
WARNING
Enclosure
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
Procedure
1. Attach the thermowell to the pipe or process container wall.
2. Install and tighten the thermowell before applying process
pressure.
3. Verify the transmitter failure mode switch position.
4. Assemble the transmitter to the sensor. Push the transmitter
mounting screws through the sensor mounting plate.
5. Wire the sensor to the transmitter.
6. 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.
7. If using a cable gland, properly attach the cable gland to a
housing conduit entry.
8. Insert the shielded cable leads into the connection head
through the cable entry.
9. Connect the shielded power cable leads to the transmitter
power terminals.
Avoid contact with sensor leads and sensor connections.
10. Connect and tighten the cable gland.
11. Install and tighten the connection head cover.
Quick Start Guide April2023
6 Rosemount 644
A. Connection head cover
B. Connection head
C. Thermowell
D. Transmitter mounting screws
E. Integral mount sensor with flying leads
F. Extension
3.1.2 Head mount transmitter with threaded sensor installation
(two or three conduit entries)
WARNING
Enclosure
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
Procedure
1. Attach the thermowell to the pipe or process container wall.
2. Install and tighten thermowells before applying process
pressure.
3. Attach necessary extension nipples and adapters to the
thermowell.
4. Seal the nipple and adapter threads with silicone tape.
5. Screw the sensor into the thermowell. Install drain seals
if required for severe environments or to satisfy code
requirements.
6. Verify the transmitter failure mode switch is in the desired
position.
7. Verify the correct installation of Integral Transient Protection
(option code T1).
a) Ensure the transient protector unit is firmly connected
to the transmitter puck assembly.
April2023 Quick Start Guide
Quick Start Guide 7
b) Ensure the transient protector power leads are
adequately secured under the transmitter power
terminal screws.
c) Verify the transient protector’s ground wire is secured
to the internal ground screw found within the universal
head.
Note
The transient protector requires the use of an enclosure of at
least 3.5-in. (89 mm) in diameter.
8. Pull the sensor wiring leads through the universal head and
transmitter center hole.
9. Mount the transmitter in the universal head by threading
the transmitter mounting screws into the universal head
mounting holes.
10. Mount the transmitter-sensor assembly into the thermowell,
or remote mount if desired.
11. Seal adapter threads with silicone tape.
12. Pull the field wiring leads through the conduit into the
universal head. Attach the sensor and power leads to the
transmitter.
Avoid contact with other terminals.
13. Install and tighten the universal head cover.
A. Threaded thermowell
B. Threaded style sensor
C. Universal head (transmitter inside)
D. Standard extension
E. Conduit entry
Quick Start Guide April2023
8 Rosemount 644
3.1.3 Field mount transmitter with threaded sensor installation
WARNING
Enclosure
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
Procedure
1. Attach the thermowell to the pipe or process container
wall. Install and tighten thermowells 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. Verify the transmitter failure mode switch is in the desired
position.
6. Mount the transmitter-sensor assembly into the thermowell or
remote mount if desired.
7. Seal adapter threads with silicone tape.
8. Pull the field wiring leads through the conduit into the field
mount housing. Wire the sensor and power leads to the
transmitter.
Avoid contact with other terminals.
9. Install and tighten the covers of two compartments.
A
C
B
D
E
A. Threaded thermowell
B. Threaded style sensor
C. Standard extension
D. Field mount housing (transmitter inside)
April2023 Quick Start Guide
Quick Start Guide 9
E. Conduit entry
3.2 Wire and apply power
3.2.1 Wire the sensor to the transmitter
Figure 3-1: Rosemount 644 Head Mount - Single and Dual Input
Wiring Diagrams
•The transmitter must be configured for at least a three-wire RTD
in order to recognize an RTD with a compensation loop.
•Emerson provides a four-wire sensors for all single element RTDs.
Use these RTDs in three-wire configurations by leaving the
unneeded leads disconnected and insulated with electrical tape.
Figure 3-2: Rosemount 644 Field Mount — Single and Dual Input
Wiring Diagrams
3.2.2 Power the transmitter
An external power supply is required to operate the transmitter.
Procedure
1. Remove the housing cover (if applicable).
Quick Start Guide April2023
10 Rosemount 644
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