Emerson Rosemount 848T User manual

Quick Start Guide
00825-0100-4697, Rev TC
May 2019
Rosemount™ 848T FOUNDATION™ Fieldbus
High Density Temperature Transmitter
Device Revision 8 - Requires New DD/CFF
Revision

Contents
About this guide...........................................................................................................................3
Mount the transmitter..................................................................................................................5
Wire and apply power...................................................................................................................9
Verify the tag............................................................................................................................. 16
Verify the transmitter configuration...........................................................................................17
Product certifications................................................................................................................. 18
Declaration of conformity.......................................................................................................... 32
China RoHS................................................................................................................................ 34
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2 Rosemount 848T

1 About this guide
This guide provides basic guidelines for the Rosemount™ 848T Temperature
Transmitter. It does not provide instructions for detailed configuration,
diagnostics, maintenance, service, troubleshooting. Refer to the Rosemount
848T Reference Manual for more instruction. The manual and this guide are
also available electronically on Emerson.com/Rosemount
WARNING
Explosions could result in death or serious injury.
Installation of this transmitter in an explosive environment must be in
accordance with the appropriate local, national, and international standards,
codes, and practices. Review the approvals section of this manual for any
restrictions associated with a safe installation.
•Before connecting a Field Communicator in an explosive atmosphere,
make sure the instruments in the loop are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
Electrical shock can result in death or serious injury.
•Avoid contact with the leads and terminals. High voltage that may be
present on leads can cause electrical shock.
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.
CAUTION
This device complies with Part 15 of the FCC Rules. Operation is subject
to the following conditions:
•This device may not cause harmful interference.
•This device must accept any interference received, including
interference that may cause undesired operation.
•This device must be installed to ensure a minimum antenna separation
distance of 20 cm from all persons.
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NOTICE
Battery hazards remain when cells are discharged.
The power module may be replaced in a hazardous area. The power module
has surface resistivity greater than one gigaohm and must be properly
installed in the wireless device enclosure. Care must be taken during
transportation to and from the point of installation to prevent electrostatic
charge build-up.
Shipping considerations for wireless products.
•The unit was shipped to you without the power module installed.
Remove the power module prior to shipping.
•Each power module contains two “C” size primary lithium batteries.
Primary lithium batteries are regulated in transportation by the U. S.
Department of Transportation, and are also covered by IATA
(International Air Transport Association), ICAO (International Civil
Aviation Organization), and ARD (European Ground Transportation of
Dangerous Goods). It is the responsibility of the shipper to ensure
compliance with these or any other local requirements. Consult current
regulations and requirements before shipping.
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2 Mount the transmitter
2.1 Mount to a DIN rail without a junction box
Procedure
1. Pull up the DIN rail mounting clip located on the top back side of the
transmitter.
2. Hinge the DIN rail into the slots on the bottom of the transmitter.
3. Tilt the Rosemount™ 848T and place onto the DIN rail.
4. Release the mounting clip.
Figure 2-1: Mounting the Rosemount 848T to a DIN Rail
A
B
C
A. Rosemount 848T without installed enclosure
B. DIN rail
C. DIN rail mounting clip
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2.2 Mount to a panel with a junction box
Figure 2-2: Aluminum/Plastic Junction Box
A
B
C
A. Aluminum or plastic junction box
B. Mounting screws (4)(1)
C. Panel
Figure 2-3: Stainless Steel Junction Box
A
B
C
A. Stainless steel junction box
B. Mounting screws (2)(1)
C. Panel
(1) Mount using four ¼–20 x 1.25-in. screws.
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2.3 Mount to a 2-in. pipe stand
Prerequisites
Use the optional mounting bracket (option code B6) to attach the
Rosemount™ 848T to a 2-in. pipe stand when using a junction box.
Figure 2-4: Aluminum/Plastic Junction Box
Front view Side view
5.1
(130)
10.2
(260)
6.6
(167)
Figure 2-5: Stainless Steel Junction Box
Front view Side view
4.7 (114)
7.5 (190)
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Figure 2-6: Mounted on a Vertical Pipe
Aluminum/plastic junction box Stainless steel junction box
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3 Wire and apply power
3.1 Using cable glands
Figure 3-1: Cable Gland
ACEGI
J
BDFH
A. Sensor 1
B. Sensor 2
C. Sensor 3
D. Sensor 4
E. Sensor 5
F. Sensor 6
G. Sensor 7
H. Sensor 8
I. Power/signal
J. Cover screw
Procedure
1. Remove the four cover screws to remove the junction box cover.
2. Run the sensor and power/signal wires through the appropriate pre-
installed cable glands.
3. Install the sensor wires into the correct screw terminals.
4. Attach the FOUNDATION™ Fieldbus wires to the screw terminals.
5. Replace the FOUNDATION Fieldbus cover and tighten all cover screws.
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3.2 Using conduit entries
Figure 3-2: Conduit Entries
F
ABCD
E
A. Sensor 1 and 2
B. Sensor 3 and 4
C. Sensor 5 and 6
D. Sensor 7 and 8
E. Power/signal
F. Cover screw
Procedure
1. Unscrew the four cover screws to remove the junction box cover.
2. Remove the five conduit plugs and install the user-supplied conduit
fittings.
3. Run pairs of sensor wires through each conduit fitting.
4. Install the sensor wires into the correct screw terminals.
5. Attach the FOUNDATION™ Fieldbus wires to the screw terminals.
6. Replace the enclosure cover and tighten all cover screws.
3.3 Sensor wiring and power supply
•Compatible with eight independently configurable channels including
combinations of 2- and 3-wire RTDs, thermocouples, mV, ohm, and mA
sensors.
•All sensor and power terminals are rated to 42.4 Vdc.
•FOUNDATION Fieldbus network powered with a terminal voltage of 9.0–
32.0 Vdc and 22 mA maximum current draw.
•For best network performance twisted, shielded pair cabling should be
used. Proper gage wire should be selected to maintain the 9.0 Vdc
minimum.
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Figure 3-3: Sensor Wiring Diagrams
1 1 1 12 2 2 23 3 3 3
2-wire RTD and
Ohms
3-wire RTD and
Ohms(1)
Thermocouples/
Ohms and
millivolts
2-Wire RTD with
compensation
loop(2)
(1) Emerson provides 4-wire sensors for all single-element RTDs. Use these RTDs in
3-wire configurations by clipping the fourth lead or leaving it disconnected and
insulated with electrical tape.
(2) The transmitter must be configured for a 3-wire RTD in order to recognize an
RTD with a compensation loop.
The wiring of 3-wire RTDs for this unit is different than some earlier
Rosemount™ 848T models. Pay careful attention to the wiring diagram on
the label, especially if this unit is replacing an older unit.
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3.4 Wiring analog inputs
Figure 3-4: Rosemount™ 848T Analog Input Wiring Diagram
A
C
B
A. Analog input connectors
B. Analog transmitters
C. Power supply
3.5 Typical configuration for FOUNDATION Fieldbus networking
Note
Each segment in a FOUNDATION™ Fieldbus trunk must be terminated at both
ends.
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12 Rosemount 848T

A
B C
D
E E
F
A. 6234 ft. (1900 m) max (depending upon cable characteristics)
B. Integrated power conditioner and filter
C. Terminators
D. Trunk
E. Sput
F. Signal wiring
3.5.1 Ground the transmitter
Proper ground is crucial to reliable temperature readings.
3.5.2 Ungrounded thermocouple, mV, and RTD/Ohm inputs
Option 1
Procedure
1. Connect FOUNDATION™ Fieldbus signal wiring shield to the sensor
wiring shield(s).
2. Ensure the shields are tied together and electrically isolated from the
transmitter enclosure.
3. Only ground the shield at the power supply end.
4. Ensure that the sensor shield(s) is electrically isolated from the
surrounding grounded fixtures.
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A
BC
D
A. Sensor wires
B. Rosemount™ 848T
C. Power supply
D. Shield ground point
Option 2
Procedure
1. Connect sensor wiring shield(s) to the transmitter enclosure (only if
the enclosure is grounded).
2. Ensure the sensor shield(s) is electrically isolated from surrounding
fixtures that may be grounded.
3. Ground FOUNDATION™ Fieldbus signal wiring shield at the power
supply end.
A
BC
D
A. Sensor wires
B. Rosemount™ 848T
C. Power supply
D. Shield ground point
3.5.3 Grounded thermocouple inputs
Procedure
1. Ground sensor wiring shield(s) at the sensor.
2. Ensure the sensor wiring and FOUNDATION™ Fieldbus signal wiring
shields are electrically isolated from the transmitter enclosure.
3. Do not connect the FOUNDATION Fieldbus signal wiring shield to the
sensor wiring shield(s).
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14 Rosemount 848T

4. Ground FOUNDATION Fieldbus signal wiring shield at the power supply
end.
A
BC
D
A. Sensor wires
B. Rosemount™ 848T
C. Power supply
D. Shield ground point
3.6 Analog device inputs
Procedure
1. Ground analog signal wire at the power supply of the analog devices.
2. Ensure the analog signal wire and the FOUNDATION™ Fieldbus signal
wire shields are electrically isolated from the transmitter enclosure.
3. Do not connect the analog signal wire shield to the FOUNDATION
Fieldbus signal wire shield.
AC D F
G
BE
A. Analog device power supply
B. 4–20 mA loop
C. Analog device
D. Rosemount™ 848T
E. FOUNDATION Fieldbus
F. Power supply
G. Shield ground points
3.6.1 Transmitter enclosure (optional)
Ground in accordance with local electrical requirements.
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4 Verify the tag
The Rosemount 848T has a removable commissioning
tag that contains both the Device ID (the unique code
that identifies a particular device in the absence of a
device tag) and a space to record the device tag (the
operational identification for the device as defined by
the Piping and Instrumentation Diagram [P&ID]).
When commissioning more than one device on a
FOUNDATION™ Fieldbus segment, it can be difficult to
identify which device is at a particular location. The
removable tag aids in this process by linking the
Device ID to physical location. The installer should
note the physical location of the transmitter on both
the upper and lower location of the commissioning
tag. The bottom portion should be torn off for each
device on the segment and used for commissioning
the segment in the control system.
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16 Rosemount 848T

5 Verify the transmitter configuration
Each FOUNDATION™ Fieldbus host or configuration tool has a different way of
displaying and performing configurations. Some use Device Descriptions
(DD) or DD wizards for configuration and to display data consistently across
platforms. There is no requirement that a host or configuration tool support
these features.
The following is the minimum configuration requirement for a temperature
measurement. This guide is designed for systems not using DD wizards. For
a complete list of parameters and configuration information refer to the
Rosemount™ 848T Reference Manual.
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6 Product certifications
Rev 2.12
European Directive Information
A copy of the EU Declaration of Conformity can be found at the end of the
Quick Start Guide. The most recent revision of the EU Declaration of
Conformity can be found at Emerson.com/Rosemount.
Ordinary Location Certification from FM Approvals
As standard, the transmitter has been examined and tested to determine
that the design meets the basic electrical, mechanical, and fire protection
requirements by FM Approvals, a nationally recognized test laboratory
(NRTL) as accredited by the Federal Occupational Safety and Health
Administration (OSHA).
North America
The US National Electrical Code™ (NEC) and the Canadian Electrical Code
(CEC) permit the use of Division marked equipment in Zones and Zone
marked equipment in Divisions. The markings must be suitable for the area
classification, gas, and temperature class. This information is clearly defined
in the respective codes.
6.1 U.S.A
6.1.1 I5 FM Intrinsically Safe and Nonincendive
Certificate 3011568
Standards FM Class 3600:1998, FM Class 3610:2010, FM Class
3611:2004, FM Class 3810:2005, ANSI/ISA 60079-0:2009,
ANSI/ISA 60079-11:2009, NEMA 250:1991, IEC 60529:2011
Markings IS CL I, DIV 1, GP A, B, C, D; T4(–50 °C ≤ Ta ≤ +60 °C); NI CL I,
DIV 2, GP A, B, C, D; T4A(–50 °C ≤ Ta ≤ +85 °C); T5(–50 °C ≤ Ta
≤ +70 °C) when installed per Rosemount™ drawing
00848-4404.
Note
Transmitters marked with Nonincendive CL I, DV 2 can be installed in
Division 2 locations using general Division 2 wiring methods or
Nonincendive Field Wiring (NIFW). See Drawing 00848-4404.
6.1.2 IE FM FISCO
Certificate 3011568
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18 Rosemount 848T

Standards FM Class 3600:1998, FM Class 3610:2010, FM Class
3611:2004, FM Class 3810:2005, ANSI/ISA 60079-0:2009,
ANSI/ISA 60079-11:2009, NEMA 250:1991, IEC 60529:2011
Markings IS CL I, DIV 1, GP A, B, C, D; T4(–50 °C ≤ Ta ≤ +60 °C); NI CL I,
DIV 2, GP A, B, C, D; T4A(–50 °C ≤ Ta ≤ +85 °C); T5(–50 °C ≤ Ta
≤ +70 °C) when installed per Rosemount™ drawing
00848-4404.
6.1.3 N5 Nonincendive and Dust-Ignitionproof
Certificate 3011568
Standards FM Class 3600:1998, FM Class 3611:2004, FM Class
3810:2005, ANSI/ISA 60079-0:2009, NEMA 250:1991, IEC
60529:2011
Markings NI CL I, DIV 2, GP A, B, C, D; DIP CL II/III, DIV 1, GP E, F, G; T4A(–
50 °C ≤ Ta ≤ +85 °C); T5(–50 °C ≤ Ta ≤ +70 °C) when installed
per Rosemount™ drawing 00848-4404; Type 4X
6.1.4 NK Nonincendive
Certificate 3011568
Standards FM Class 3600:1998, FM Class 3611:2004, FM Class
3810:2005, ANSI/ISA 60079-0:2009, NEMA 250:1991, IEC
60529:2001
Markings NI CL I, DIV 2, GP A, B, C, D; T4A(–50 °C ≤ Ta ≤ +85 °C); T5(–50
°C ≤ Ta ≤ +70 °C) when installed per Rosemount™ drawing
00848-4404
Note
Only the N5 and NK are valid with the S002 option.
Table 6-1: MAI Block Parameters
Fieldbus (input) FISCO (input) Nonincendive
(input)
Sensor field
terminal (output)
VMAX = 30 V VMAX = 17.5 VMAX = 42.4 VOC = 12.5 V
IMAX = 300 mA IMAX = 380 mA Ci = 2.1 nF ISC = 4.8 mA
Pi = 1.3 W Pi = 5.32 W Li = 0 PO = 15 mW
Ci = 2.1 nF Ci = 2.1 nF N/A CA = 1.2 μF
Li = 0 Li = 0 N/A LA = 1 H
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6.2 Canada
6.2.1 E6 CSA Explosionproof, Dust-Ignitionproof, Division 2 (JX3 Enclosure
Required)
Certificate 1261865
Standards CAN/CSA C22.2 No. 0-M91 (R2001), CSA Std. C22.2 No.
25.1966, CSA Std. C22.2 No. 30-M1986, CAN/CSA C22.2 No.
94-M91, CSA Std. C22.2 No. 142-M1987, CSA Std. C22.2 No.
213-M1987, CSA Std. C22.2 No. 60529:05
Markings Explosionproof for Class I, Division 1, Groups B, C, and D; T4(–
40 °C ≤ Ta ≤ +40 °C) when installed per Rosemount drawing
00848-1041; Dust-Ignitionproof for Class II, Division 1, Groups
E, F, and G; Class III; Class I, Division 2, Groups A, B, C, and D;
T3C(–50 °C ≤ Ta ≤ +60 °C) when installed per Rosemount
drawing 00848-4405; Conduit Seal Required
6.2.2 I6 CSA Intrinsically Safe and Division 2
Certificate 1261865
Standards CAN/CSA C22.2 No. 0-M91 (R2001), CAN/CSA C22.2 No. 94-
M91, CSA Std. C22.2 No. 142-M1987, CSA Std. C22.2 No.
157-92, CSA Std. C22.2 No. 213-M1987, CSA Std. C22.2 No.
60529:05
Markings Intrinsically Safe for Class I, Division 1, Groups A, B, C, and D;
T3C(–50 °C ≤ Ta ≤ +60 °C) when installed per Rosemount
drawing 00848-4405; Class I, Division 2, Groups A, B, C, D;
T3C(–50 °C ≤ Ta ≤ +60 °C) when installed per Rosemount
drawing 00848-4405
6.2.3 IF CSA FISCO
Certificate 1261865
Standards CAN/CSA C22.2 No. 0-M91 (R2001), CAN/CSA C22.2 No. 94-
M91, CSA Std. C22.2 No. 142-M1987, CSA Std. C22.2 No.
157-92, CSA Std. C22.2 No. 213-M1987, CSA Std. C22.2 No.
60529:05
Markings Intrinsically Safe for Class I, Division 1, Groups A, B, C, and D;
T3C(–50 °C ≤ Ta ≤ +60 °C) when installed per Rosemount
drawing 00848-4405; Class I, Division 2, Groups A, B, C, D;
T3C(–50 °C ≤ Ta ≤ +60 °C) when installed per Rosemount
drawing 00848-4405
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