Emerson Rosemount 644 User manual
Contents
About this guide...........................................................................................................................3
System readiness......................................................................................................................... 5
Transmitter installation................................................................................................................ 6
Configuration...............................................................................................................................9
Mount the transmitter................................................................................................................11
Safety instrumented systems..................................................................................................... 13
Product certifications................................................................................................................. 14
China RoHS................................................................................................................................ 27
Quick Start Guide July 2022
2 Emerson.com/Rosemount
1 About this guide
This guide provides basic guidelines for installing the Rosemount 644R Rail
Mount Temperature Transmitter. It does not provide instructions for
detailed configuration, diagnostics, maintenance, service, troubleshooting,
or installation. Refer to the Rosemount 644R Rail Mount 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 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.
July 2022 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. 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.
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 July 2022
4 Emerson.com/Rosemount
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. This
transmitter is a HART Revision 7 device.
2.2 Confirm correct device driver
•Verify the latest Device Driver files are loaded on your systems to ensure
proper communications.
•Download the latest Device Driver at Emerson.com/Rosemount.
July 2022 Quick Start Guide
Quick Start Guide 5
3 Transmitter installation
3.1 Safety messages
Instructions and procedures in this section may require special precautions
to ensure the safety of the personnel performing the operations.
Information that potentially raises safety issues is indicated by a warning
symbol ( ). Please refer to the following safety messages before performing
an operation preceded by this symbol.
WARNING
Failure to follow these installation guidelines could result in death or
serious injury.
Ensure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Do not remove the housing covers 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 that 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 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 could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
Quick Start Guide July 2022
6 Emerson.com/Rosemount
3.2 Connections
Single input
2 w / 3 w / 4 w RTD
or lin. R
TC (internal CJC or
external 2 w / 3 w /
4 w CJC)(1)
mV 3 w / 4 w
potentiometer
42 44
43
41
43 I1
41 42 44
43
+
-
CJC
3
41 42 44
43
+
41 42 44
43
4I1
(1) When using thermocouple input, the transmitter can be configured for either
constant, internal or external CJC via a Pt100 or Ni100 sensor. This must be
selected during device configuration.
Dual inputs
Input 1
41 42 44
43 41 42 44
43 41 42 44
43
51 52 54
53 51 52 54
53 51 52 54
53 51 52 54
53
41 42 44
43
4I2
+
43 I1 +
-
+
43 I1 +
-
CJC
3
4I1
41 42 44
43
51 52 54
53
4 5
I1
4I2
A B D
F
C E
A B C D
Input 2
A. 2 w / 3 w / 4 w RTD or lin. R
B. TC (internal CJC or external 2 w / 3 w / 4 w CJC)(1)
C. mV
D. 3 w / 4 w potentiometer
E. 5 w potentiometer
F. 3 w potentiometer
(1) When using thermocouple input, the transmitter can be configured for either
constant, internal or external CJC via a Pt100 or Ni100 sensor. This must be selected
during device configuration.
July 2022 Quick Start Guide
Quick Start Guide 7
Output
2-wire installation
11 12 14
13
mA
3.3 Multidrop mode
The communication is either by means of a HART® communicator or a HART
modem.
The HART communicator or a HART modem can be connected across BC or
CD.
The outputs of maximum 63 transmitters can be connected in parallel for a
digital HART 2-wire communication.
Before it is connected, each transmitter must be configured with a unique
number from 1 to 63. If two transmitters are configured with the same
number, both will be excluded. The transmitters must be programmed for
multidrop mode (with a fixed output signal of 4 mA). Maximum current in
the loop is therefore 252 mA.
B
C
D
+
-
+
-
A
E
F F F
A. Power supply
B. Connection
C. Connection
D. Connection
E. 250 Ω < Rload < 1100 Ω
F. Transmitter
Quick Start Guide July 2022
8 Emerson.com/Rosemount
4 Configuration
4.1 Safety messages
Instructions and procedures in this section may require special precautions
to ensure the safety of the personnel performing the operations.
Information that potentially raises safety issues is indicated by a warning
symbol ( ). Please refer to the following safety messages before performing
an operation preceded by this symbol.
WARNING
Failure to follow these installation guidelines could result in death or
serious injury.
Ensure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Do not remove the housing covers 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 that 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 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 could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
4.2 Configuration methods
The device can be configured in the following ways:
•With a HART® communicator with Emerson's DDL driver
•Via programming framework (e.g. AMS Device Manager, DCS,
PACTware™)
July 2022 Quick Start Guide
Quick Start Guide 9
HART communicator
To get access to product-specific commands, the HART communicator must
be loaded with Emerson's DDL driver. This can be ordered through either the
FieldComm Group or Emerson.
44
43
42
41
51
11121314
12
11
A
BC
D
E
F
G
A. Rosemount transmitter
B. Ex area
C. Safe area
D. 250 Ω < Rload < 1100 Ω
E. Receiving equipment
F. +V supply
G. Input
Programming framework
Support for both EDD and FDT®/DTM™ technology, offering configuration
and monitoring via relevant DCS/Asset Management Systems and
supported management packages (e.g. PACTware).
12
11
+
-
44
43
42
41
51
11121314
A
B
D
C
A. Rosemount transmitter
B. 250 Ω < Rload < 1100 Ω
C. Process computer
D. DCS, etc.
Quick Start Guide July 2022
10 Emerson.com/Rosemount
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