Emerson Rosemount 644H Quick Start Guide
00825-0300-4728, Rev EA
Rosemount™ 644H Temperature
Transmitter
with PROFIBUS® PA
Quick Start Guide
April 2020
Quick Start Guide April 2020
Contents
About this guide...........................................................................................................................3
Mount the transmitter..................................................................................................................5
Wire and apply power...................................................................................................................8
Ground the transmitter.............................................................................................................. 11
Verify tagging............................................................................................................................ 15
Transmitter configuration.......................................................................................................... 16
Product certifications................................................................................................................. 20
Declaration of Conformity..........................................................................................................38
China RoHS................................................................................................................................ 42
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April 2020 Quick Start Guide
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 nuclearqualified applications.
Using non-nuclear qualified products in applications that require nuclearqualified hardware or products may cause inaccurate readings.
For information on Rosemount 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 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 3
Quick Start Guide April 2020
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 explosionproof 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.
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April 2020 Quick Start Guide
2 Mount the transmitter
Mount the transmitter at a high point in the conduit run to prevent moisture
from draining into the transmitter housing.
2.1 Install connection head
Head mount transmitter with DIN plate style sensor.
Prerequisites
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 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.
Quick Start Guide 5
D
A
E
B
F
C
Quick Start Guide April 2020
A. Rosemount 644 Transmitter
B. Connection head
C. Thermowell
D. Transmitter mounting screws
E. Integral mount sensor with flying leads
F. Extension
2.2 Install universal head
Head mount transmitter with threaded sensor.
Prerequisites
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.
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
6 Emerson.com/Rosemount
internal ground screw found within the universal head.
A
B
C
D
E
April 2020 Quick Start Guide
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
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.
A. Threaded thermowell
B. Standard extension
C. Threaded style sensor
D. Universal head (transmitter and LCD inside)
E. Conduit entry
Quick Start Guide 7
Quick Start Guide April 2020
3 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.
3.1 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.
3.2 Power the transmitter
Procedure
1. Remove the terminal block cover (if applicable).
2. Connect the power lead to the power terminals.
The Rosemount 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).
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1 2 3 4
A
B
C
April 2020 Quick Start Guide
5. Apply power (9–32 Vdc).
A. Sensor terminals
B. Communication terminals
C. Power terminals
Figure 3-1: Sensor Connections
Two-wire RTD
and Ω
(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.
Quick Start Guide 9
Three-wire RTD
and Ω
(1)
Four-wire RTD
and Ω
(2)
T/C and mV
A
B
C
E
F
F
G
H
I
D
Quick Start Guide April 2020
Figure 3-2: Typical Configuration for Fieldbus Networking
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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A
B
C
DCS
D
April 2020 Quick Start Guide
4 Ground the transmitter
4.1 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).
4.1.1 Ground the transmitter: option 1
Procedure
1. Connect sensor wiring shield to the transmitter housing.
2. Ensure the sensor shield is electrically isolated from surrounding
fixtures that may be grounded.
3. Ground signal wiring shield at the power supply end.
A. Sensor wires
B. Transmitter
C. Shield ground point
D. 4-20 mA loop
Quick Start Guide 11
A
B
C
D
DCS
Quick Start Guide April 2020
4.1.2 Ground the transmitter: option 2
Procedure
1. Connect signal wiring shield to the sensor wiring shield.
2. Ensure the two shields are tied together and electrically isolated from
the transmitter housing.
3. Ground shield at the power supply end only.
4. Ensure the sensor shield is electrically isolated from the surrounding
grounded fixtures.
A. Sensor wires
B. Transmitter
C. Shield ground point
D. 4-20 mA loop
Note
Connect shields together, electrically isolated from the transmitter.
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DCS
A
B
C
D
April 2020 Quick Start Guide
4.1.3 Ground the transmitter: option 3
Procedure
1. Ground sensor wiring shield at the sensor if possible.
2. Ensure the sensor wiring and signal wiring shields are electrically
isolated from the transmitter housing.
3. Do not connect the signal wiring shield to the sensor wiring shield.
4. Ground the signal wiring shield at the power supply end.
A. Sensor wires
B. Transmitter
C. Shield ground point
D. 4-20 mA loop
Quick Start Guide 13
DCS
A
B
C
D
Quick Start Guide April 2020
4.2 Grounded thermocouple inputs
4.2.1 Ground the transmitter: option 4
Procedure
1. Ground sensor wiring shield at the sensor.
2. Ensure the sensor wiring and signal wiring shields are electrically
isolated from the transmitter housing.
3. Do not connect the signal wiring shield to the sensor wiring shield.
4. Ground signal wiring shield at the power supply end.
A. Sensor wires
B. Transmitter
C. Shield ground point
D. 4–20 mA loop
14 Emerson.com/Rosemount
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