Rosemount 848T Quick Start Guide

Quick Start Guide

00825-0100-4697, Rev SF

June 2016

Rosemount™ 848T FOUNDATION™ Fieldbus High Density Temperature Transmitter

Device Revision 8 - Requires New DD/CFF Revision

Quick Start Guide

June 2016

NOTICE

This guide provides basic guidelines for the Rosemount 848T. It does not provide instructions for detailed configuration, diagnostics, maintenance, service, troubleshooting. Refer to the Rosemount 848T Reference Manual (document number 00809-0100-4697) for more instruction. The manual and this guide are also available electronically on www.rosemount.com.

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.

Process leaks may cause harm or result in death.

 Install and tighten thermowells or sensors before applying pressure.  Do not remove the thermowell while in operation.

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.

Shipping considerations for wireless products:

The unit was shipped to you without the power module installed. Remove the power module prior to shipping the unit.

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.

Contents

Mount the transmitter. . . . . . . . . . . . . . . . . . . . . 3

Wire and apply power . . . . . . . . . . . . . . . . . . . . . 5

Verify the tag. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Verify the transmitter configuration . . . . . . . 10

Product Certifications. . . . . . . . . . . . . . . . . . . . 13

June 2016

Step 1: Mount the transmitter

Mount to a DIN rail without a junction box

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 1. Mounting the Rosemount 848T to a DIN Rail

A. Rosemount 848T without installed enclosure B. DIN Rail C. DIN Rail mounting clip

Quick Start Guide

Mounting to a panel with a junction box

Figure 2. Aluminum/Plastic Junction Box

A. Aluminum or plastic junction box B. Mounting screws (4)

C. Panel

1. Mount using four 1/4-20 ⫻ 1.25-in. screws.

(1)

Quick Start Guide

5.1

(130)

10.2

(260)

6.6

(167)

(1)

4.7 (114)

7.5 (190)

(1)

Figure 3. Stainless Steel Junction Box

A. Stainless steel junction box B. Mounting screws (2) C. Panel

(1)

Mounting to a 2-in. pipe stand

Use the optional mounting bracket (option code B6) to attach the 848T to a 2-in.

pipe stand when using a junction box.

June 2016

Figure 4. Aluminum/Plastic Junction Box

Fron t view Side view

Figure 5. Stainless Steel Junction Box

Fron t view Side view

(2)

1. Mount using two 1/4–20 1/2-in. screws.

2. Fully assembled.

June 2016

Quick Start Guide

Figure 6. Mounted on a Vertical Pipe

Aluminum/plastic junction box Stainless steel junction box

Step 2: Wire and apply power

Power is polarity insensitive, allowing the user to connect positive (+) or negative

OUNDATION Fieldbus wires to either FOUNDATION Fieldbus wiring terminal on

(–) F the terminal block.

Using cable glands

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 F

5. Replace the F

OUNDATION Fieldbus wires to the screw terminals.

OUNDATION Fieldbus cover and tighten all cover screws.

Using conduit entries

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 F

6. Replace the enclosure cover and tighten all cover screws.

OUNDATION Fieldbus wires to the screw terminals.

Quick Start Guide

11 1 1222 23333

Figure 7. Wiring Connections

Cable gland Conduit entries

June 2016

A. Sensor 1 B. Sensor 2 C. Sensor 3 D. Sensor 4 E. Sensor 5

F. S en sor 6 G. Sensor 7 H. Sensor 8 I. Power/signal J. Cover screw

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

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 to 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.

Figure 8. Sensor Wiring Diagrams

Thermocouples/

2-wire RTD and Ohms 3-wire RTD and Ohms

1. Emerson™ Process Management 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.

(1)

Ohms and millivolts

2-Wire RTD with

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.

(2)

June 2016

Wiring analog inputs

Figure 9. Rosemount 848T Analog Input Wiring Diagram

A. Analog input connectors B. Analog transmitters C. Power supply

Quick Start Guide

Typical configuration for FOUNDATION Fieldbus networking

Note

Each segment in a FOUNDATION Fieldbus trunk must be terminated at both ends.

A. 6234 ft. (1900 m) max

(depending upon cable characteristics)

B. Integrated power conditioner and filter C. Terminators

D. Trunk E. Spur

F. Sig na l w iring

Quick Start Guide

Ground the transmitter

Proper ground is crucial to reliable temperature readings.

Ungrounded thermocouple, mV, and RTD/Ohm inputs

Option 1

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.

June 2016

A. Sensor wires B. Rosemount 848T

C. Power supply D. Shield ground point

Option 2

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 F

A. Sensor wires B. Rosemount 848T

OUNDATION Fieldbus signal wiring shield at the power supply end.

C. Power supply D. Shield ground point

Grounded thermocouple inputs

1. Ground sensor wiring shield(s) at the sensor.

2. Ensure the sensor wiring and F electrically isolated from the transmitter enclosure.

3. Do not connect the F

OUNDATION Fieldbus signal wiring shield to the sensor

wiring shield(s).

OUNDATION Fieldbus signal wiring shields are

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4. Ground FOUNDATION Fieldbus signal wiring shield at the power supply end.

Quick Start Guide

A. Sensor wires B. Rosemount 848T

C. Power supply D. Shield ground point

Analog device inputs

1. Ground analog signal wire at the power supply of the analog devices.

2. Ensure the analog signal wire and the F

are electrically isolated from the transmitter enclosure.

3. Do not connect the analog signal wire shield to the F

wire shield.

4. Ground F

OUNDATION Fieldbus signal wire shield at the power supply end.

A. Analog device power supply B. 4-20 mA loop C. Analog device D. Rosemount 848T

Transmitter enclosure (optional)

Ground in accordance with local electrical requirements.

OUNDATION Fieldbus signal wire shields

OUNDATION Fieldbus signal

E. FOUNDATION Fieldbus F. Power supply G. Shield ground points

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