Emerson Rosemount 644h User manual

Quick Start Guide
00825-0100-4829, Rev EB
April 2019
Rosemount™ 644H Temperature
Transmitters
with FOUNDATION™Fieldbus Protocol

Safety messages
NOTICE
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.
Important
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure to thoroughly understand the contents before installing, using, or
maintaining this product. The United States has two toll-free assistance numbers and one international
number.
Customer Central: 1-800-999-9307 (7:00 a.m. to 7:00 p.m. Central Standard Time)
National Response Center: 1-800-654-7768 (24 hours a day). Equipment service needs
International: 1-(952)-906-8888
WARNING
Follow instructions
Failure to follow these installation guidelines could result in death or serious injury.
Ensure only qualified personnel perform the installation.
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. Please 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 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.
WARNING
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.
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WARNING
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.
Contents
Mount the transmitter................................... 5
Wire and apply power.................................... 8
Ground the transmitter................................11
Verify tagging.............................................. 15
Verify transmitter configuration...................16
Product certifications...................................18
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1 Mount the transmitter
Mount the transmitter at a high point in the conduit run to prevent moisture
from draining into the transmitter housing.
1.1 Install connection head
Head mount transmitter with DIN plate style sensor.
Procedure
1. Attach the thermowell to the pipe or process container wall. Install
and tighten the thermowell before applying process pressure.
2. Assemble the transmitter to the sensor. Push the transmitter
mounting screws through the sensor mounting plate and insert the
snap rings (optional) into the transmitter mounting screw groove.
3. Wire the sensor to the transmitter.
4. Insert the transmitter-sensor assembly into the connection head.
Thread the transmitter mounting screws into the connection head
mounting holes. Assemble the extension to the connection head.
Insert the assembly into the thermowell.
5. Slip the shielded cable though the cable gland.
6. Attach the 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.
WARNING
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
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Example
D
A
E
B
F
C
A. Rosemount™ 644 Transmitter
B. Connection head
C. Thermowell
D. Transmitter mounting screws
E. Integral mount sensor with flying leads
F. Extension
1.2 Install universal head
Head mount transmitter with threaded sensor.
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.
Seal the nipple and adapter threads with silicone tape.
3. Screw the sensor into the thermowell. Install drain seals if required
for severe environments or to satisfy code requirements.
4. 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.
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.
5. Pull the sensor wiring leads through the universal head and
transmitter. Mount the transmitter in the universal head by
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threading the transmitter mounting screws into the universal head
mounting holes.
6. Mount the transmitter-sensor assembly into the thermowell. Seal
adapter threads with silicone tape.
7. Install conduit for field wiring to the conduit entry of the universal
head. Seal conduit threads with PTFE tape.
8. 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.
9. Install and tighten the universal head cover.
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
Example
ABC
D
E
A. Threaded thermowell
B. Standard extension
C. Threaded style sensor
D. Universal head (transmitter and LCD inside)
E. Conduit entry
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2 Wire and apply power
Wiring diagrams are located inside the terminal block cover.
An external power supply is required to power a Fieldbus segment.
The power required across the transmitter power terminals is 9 to 32 Vdc
(the power terminals are rated to 32 Vdc). To prevent damaging the
transmitter, do not allow terminal voltage to drop below 9 Vdc when
changing the configuration parameters.
2.1 Power filter
A Fieldbus segment requires a power conditioner to isolate the power supply
filter and decouple the segment from other segments attached to the same
power supply.
2.2 Power the transmitter
Procedure
1. Remove the terminal block cover (if applicable).
2. Connect the power lead to the power terminals.
The Rosemount™ 644H with FOUNDATION™ Fieldbus is polarity
insensitive.
If a transient protector is being used, the power leads will now be
connected to the top of the transient protector unit.
3. Tighten the terminal screws.
When tightening the sensor and power wires, the max torque is 6 in-
lb. (0.7 N-m).
4. Reattach and tighten the cover (if applicable).
5. Apply power (9–32 Vdc).
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1 2 3 4
A
B
C
A. Sensor terminals
B. Communication terminals
C. Power terminals
Example
Figure 2-1: Sensor Connections
Two-wire RTD and
Ω
Three-wire RTD(1)
and Ω
Four-wire RTD(2)
and Ω
T/C and mV
(1) Emerson provides 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.
(2) The transmitters must be configured for at least a three-wire RTD in order to
recognize an RTD with a compensation loop.
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Figure 2-2: Typical Configuration for Fieldbus Networking
A
BC
DE
F
F
G
H
I
A. 6234 ft. (1900 m) max, depending upon cable characteristics
B. Integrated power conditioner and filter
C. Terminators
D. Power supply
E. Trunk
F. Spur
G. Foundation Fieldbus configuration tool
H. Devices 1 through 16
I. Power/signal wiring
Note
The power supply, filter, first terminator, and configuration tool are typically
located in the control room.
Note
Each segment in a Fieldbus trunk must be terminated at both ends.
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