Rosemount Reference Manual: Rosemount 644 Rail Mount Temperature Transmitter Manuals & Guides
Reference Manual
00809-0500-4728, Rev AC
December 2021
Rosemount™ 644 Rail Mount Temperature
Transmitter
with RK Option and HART® 7 Protocol
Safety messages
NOTICE
Read this document before working with the product. For personal and system safety, and for optimum product performance,
make sure you thoroughly understand the contents before installing, using, or maintaining this product. For technical assistance,
contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
United States - 1-800-999-9307 (7:00 am to 7:00 pm Central Time)
Asia Pacific- 65 777 8211
Europe/Middle East/Africa - 49 (8153) 9390
North American Response Center
Equipment service needs.
1-800-654-7768 (24 hours—includes Canada)
Outside of these areas, contact your local Emerson representative.
WARNING
Follow instruction
Failure to follow these installation guidelines could result in death or serious injury.
Ensure only qualified personnel perform the installation.
Explosion
Explosions could result in death or serious injury.
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 in the loop 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
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.
Electric shock
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
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.
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.
2
Reference Manual Contents
00809-0500-4728 December 2021
Contents
Chapter 1 Introduction.............................................................................................................. 5
1.1 Using this manual........................................................................................................................ 5
1.2 Transmitter overview...................................................................................................................5
1.3 Mounting, installation, and programming................................................................................... 6
1.4 Product recycling/disposal...........................................................................................................6
Chapter 2 Installation.................................................................................................................7
2.1 Safety messages.......................................................................................................................... 7
2.2 Connections................................................................................................................................ 8
2.3 Multidrop mode...........................................................................................................................9
Chapter 3 Configuration...........................................................................................................11
3.1 Safety messages........................................................................................................................ 11
3.2 Configuration methods..............................................................................................................11
Chapter 4 Operation and Maintenance.....................................................................................13
4.1 Safety messages........................................................................................................................ 13
4.2 LED functionality........................................................................................................................13
4.3 Jumpers..................................................................................................................................... 14
4.4 Test pins.................................................................................................................................... 14
4.5 HART® commands..................................................................................................................... 14
Chapter 5 Troubleshooting...................................................................................................... 17
5.1 Primary value out of limits......................................................................................................... 17
5.2 Non-primary variable out of limits..............................................................................................17
5.3 Loop current saturated.............................................................................................................. 17
5.4 Primary sensor 1 error................................................................................................................17
5.5 Primary sensor 2 error (only if sensor 2 is enabled).....................................................................18
5.6 Dual input: Sensor Drift Alert..................................................................................................... 18
5.7 Hot Backup Active..................................................................................................................... 18
5.8 Hot Backup Active..................................................................................................................... 18
5.9 Configuration not supported by device......................................................................................18
5.10 Electronic temperature out of limits........................................................................................ 19
5.11 Power supply voltage issues.....................................................................................................19
5.12 Attempting or failed to enter SIL mode....................................................................................19
5.13 Electronics failure.................................................................................................................... 19
5.14 Electronics failure.................................................................................................................... 20
5.15 Power supply voltage issues.....................................................................................................20
5.16 Loop current read back error....................................................................................................20
5.17 Power supply voltage issues.....................................................................................................20
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Contents Reference Manual
December 2021 00809-0500-4728
5.18 Electronics failure.................................................................................................................... 20
5.19 Electronics failure.................................................................................................................... 21
5.20 Electronics failure.................................................................................................................... 21
5.21 Electronics failure.................................................................................................................... 21
5.22 Watchdog reset executed........................................................................................................21
5.23 Internal RTD sensor error......................................................................................................... 22
5.24 Sensor failure...........................................................................................................................22
5.25 Sensor measurement error...................................................................................................... 22
5.26 Sensor measurement error...................................................................................................... 22
5.27 Sensor measurement error...................................................................................................... 22
Appendix A Reference Data.........................................................................................................25
A.1 Product certifications................................................................................................................ 25
A.2 Ordering information, specifications, and drawings...................................................................25
A.3 Dimensional drawings............................................................................................................... 26
4 Rosemount 644R
Reference Manual Introduction
00809-0500-4728 December 2021
1 Introduction
1.1 Using this manual
This manual is designed to assist in the installation, operation, and maintenance of
Rosemount 644R/T Rail Mount Temperature Transmitter.
• Installation
• Configuration
• Operation and maintenance
• Troubleshooting
• Reference data
1.2 Transmitter overview
The transmitter supports the following features:
• 4-20 mA/HART® protocol (Revision 7)
• Accepts either one or two inputs from a wide variety of sensor types (2-, 3-, and 4-wire
RTD, thermocouple, mV and ohm)
• Optional Safety Certification (IEC 61508 SIL 2)
• Special dual-sensor features including Hot Backup™, Sensor Drift Alert, first good,
differential and average temperature measurements, and four simultaneous
measurement variable outputs in addition to the analog output signal
• Meets NAMUR NE21, NE43, NE44, NE89 and NE107 compliant diagnostics information.
Refer to the following literature for a full range of compatible connection heads, sensors,
and thermowells provided by Emerson:
• Rosemount 214C Temperature Sensors Product Data Sheet
• Rosemount Volume 1 Temperature Sensors and Accessories (English) Product Data
Sheet
• Rosemount DIN-Style Temperature Sensors and Thermowells (Metric) Product Data
Sheet
Table 1-1: Change Summary: Rosemount 644 Rail Mount HART Device Revision
Release date NAMUR
software
revision
NAMUR
hardware
revision
HART software
revision
(1)
Manual document
number
May 2021 01.05.10 01.05.10 7 00809-0500-4728
(1) NAMUR software revision is located on the hardware tag of the device. HART software revision
can be read using a HART communication tool.
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Introduction Reference Manual
December 2021 00809-0500-4728
1.3 Mounting, installation, and programming
• DIN rail mounting with up to 84 inputs per meter
• Communication via Asset Management tool (e.g. Pactware, AMS, HART
communicator) for which all relevant DD, eDD and DTM files are available
®
1.4 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration and disposed of
in accordance with local and national legislation/regulations.
6 Rosemount 644R
Reference Manual Installation
00809-0500-4728 December 2021
2 Installation
2.1 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.
Emerson.com/Rosemount 7
42 44
43
41
43
I1
41 42 44
43
+
-
CJC
3
41 42 44
43
+
41 42 44
43
4
I1
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
4
I2
+
43
I1
+
-
+
43
I1
+
-
CJC
3
4
I1
41 42 44
43
51 52 54
53
4 5
I1
4
I2
A B D
F
C E
A B C D
11 12 14
13
mA
Installation Reference Manual
December 2021 00809-0500-4728
2.2 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
(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
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)
C. mV
D. 3 w / 4 w potentiometer
E. 5 w potentiometer
F. 3 w potentiometer
Output
2-wire installation
(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.
8 Rosemount 644R
(1)
B
C
D
+
-
+
-
A
E
F F
F
Reference Manual Installation
00809-0500-4728 December 2021
2.3 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 2wire 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.
A. Power supply
B. Connection
C. Connection
D. Connection
E. 250 Ω < R
load
F. Transmitter
< 1100 Ω
Emerson.com/Rosemount 9
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