Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

Modes . . . . . . . . . . . . . D-18

Automatic . . . . . . . . D-18

Manual . . . . . . . . . D-18

Out of Service . . . . . D-18

Parameters . . . . . . . . . . D-15

Status Handling . . . . . . . D-19

Troubleshooting . . . . . . D-20

Installation . . . . . . . . . . . . . . 2-12

Intrinsically Safe . . . . . . . B-9

Non-Incendive . . . . . . . . .B-9

Using Cable Glands . . . . 2-12

Using Conduit Entries . . 2-12

J

Junction Box

Mounting . . . . . . . . . . . . 2-2

L

Link Active Scheduler . . . . . . . C-4

Backup LAS . . . . . . . . . . C-6

LAS Parameters . . . . . . . C-5

M

Maintenance

Hardware . . . . . . . . . . . . 4-3

Communication Check 4-3

Power Check . . . . . . 4-3

Reset Configuration . 4-3

Sensor Check . . . . . . 4-3

Measurement Transducer Block

Parameters . . . . . . . . . . 3-17

Monitoring Applications

Common Configurations

Single Selection . . . . 3-4

Typical . . . . . . . . . . . 3-4

Mounting . . . . . . . . . . . . . . . . 2-1

2-Inch Pipe Stand . . . . . . 2-3

DIN Rail Without an Enclosure

2-2

Panel with a Junction Box 2-2Multiple Analog Input

Configuration . . . . . . . . . 3-6Multiple Analog Input Block

Troubleshooting . . . . . . D-14Multiple Analog Input Function Block

D-9

Application Information . . D-14

Configuration . . . . . . . . . 3-6

Errors . . . . . . . . . . . . . . D-12

Filtering . . . . . . . . . . . . D-11

Functionality . . . . . . . . . D-10

Modes . . . . . . . . . . . . . D-13

Automatic . . . . . . . D-13

Manual . . . . . . . . . D-13

Out of Service . . . . D-13

Parameters . . . . . . . . . . D-9

Signal Conversion . . . . . D-11

Direct . . . . . . . . . . D-11

Indirect . . . . . . . . . D-12

Indirect Square Root D-12

Modes . . . . . . . . . . D-13

Simulation . . . . . . . . . . D-10

Status Handling . . . . . . D-13

N

Network Communication . . . . C-4

Addressing . . . . . . . . . . . C-6

Function Block Scheduling C-8

Link Active Scheduler . . . C-4

Scheduled Transfer . . . . . C-6

Unscheduled Transfer . . . C-7

O

Overview . . . . . . . . . . . . . . . 1-2

FOUNDATION Fieldbus . . . C-1

Manual . . . . . . . . . . . . . 1-2

Transmitter . . . . . . . . . . . 1-2

P

Performance specifications . . . A-4Power Supply . . . . . . . . . . . . 2-7Connections . . . . . . . . . . 2-7

R

Resource Block

Alarm Detection . . . . . . 3-11

Configuration . . . . . . . . . 3-7

Errors . . . . . . . . . . . . . 3-10

Modes . . . . . . . . . . . . . 3-10

Automatic . . . . . . . 3-11

Out of Service (OOS) 3-11

Parameters . . . . . . . . . . 3-7

PlantWeb Alerts

Recommended Actions 3-14

PlantWeb™ Alerts . . . . 3-11

advisory alarms . . . 3-13

failed_alarms . . . . . 3-11

maint_alarms . . . . . 3-12

Troubleshooting . . . . . . . 4-4

S

Scheduled Transfers . . . . . . . C-6

Client . . . . . . . . . . . . . . . C-6

Publisher . . . . . . . . . . . . C-6

Report Distribution . . . . . C-6

Server . . . . . . . . . . . . . . C-6

Subscriber . . . . . . . . . . . C-6

Security Switch . . . . . . . . . . 2-10

Senor

Connection Check . . . . . .4-3

Sensor

Tag . . . . . . . . . . . . . . . . 2-11

Sensor Transducer Block

Change Sensor Configuration

3-21

Sensor Calibration . . . . .3-21

Troubleshooting . . . . . . . .4-4

Sensor Wiring Diagram . . . . . .2-4

Shield Wire

Ground . . . . . . . . . . . . . .2-8

Simulate Enable Switch . . . . .2-10

Specifications

performance . . . . . . . . . A-4Surges . . . . . . . . . . . . . . . . .2-7Switches . . . . . . . . . . . . . . .2-10Security . . . . . . . . . . . . .2-10Simulate Enable . . . . . . .2-10

T

Tagging . . . . . . . . . . . . . . . . 2-11

Commissioning . . . . . . . 2-11

Sensor . . . . . . . . . . . . . 2-11

Transmitter . . . . . . . . . . 2-11

Transducer Block

Alarm Detection . . . . . . .3-17

Channel Definitions . . . .3-15

Errors . . . . . . . . . . . . . .3-16

Modes . . . . . . . . . . . . . .3-16

Automatic . . . . . . . .3-17

Out of Service . . . . .3-17

Status Handling . . . . . . .3-17

Transients . . . . . . . . . . . . . . .2-7

Transmitter

Configuration . . . . . . . . . .3-2

Tag . . . . . . . . . . . . . . . . 2-11

Transmitter Wiring Diagram . . .2-4

Troubleshooting . . . . . . . . . . .4-4

Analog Input Function Block D-8

Differential Transducer Block 4-4

FOUNDATION Fieldbus . . . .4-4

Input Selector Function Block

D-20

Multiple Analog Input Block D-14

Resource Block . . . . . . . .4-4

Sensor Transducer Block .4-4

U

Unscheduled Transfers . . . . . C-7

W

Wiring . . . . . . . . . . . . . . . . . .2-4

Communication Check . . .4-3

Power Check . . . . . . . . . .4-3

Index-2

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Emerson 848T Non-Incendive . . . . . . . . .B-9, Hardware, Sensor Check, Parameters, Typical Mounting, Manual Transmitter

848T specifications

The Emerson 848T is a state-of-the-art temperature transmitter designed for accurate and reliable temperature measurement in various industrial applications. This device has gained recognition for its advanced features and robust performance, making it a popular choice among engineers and technicians in the field.

One of the key highlights of the Emerson 848T is its unique dual-channel capability, which allows it to seamlessly monitor two temperature sources simultaneously. This functionality is particularly beneficial in processes where multiple temperature points need to be assessed, optimizing efficiency and reducing the need for additional equipment. It supports various sensor types, including thermocouples, RTDs, and resistance temperature detectors, making it versatile for different applications.

The 848T is equipped with sophisticated digital processing technology, which enhances its accuracy and stability. It features a 24-bit analog-to-digital converter, ensuring precise measurement and minimizing drift over time. Moreover, the device boasts a wide operating temperature range, accommodating ambient conditions from -40°C to 85°C. This durability makes it suitable for harsh environments commonly encountered in industries such as oil and gas, pharmaceuticals, and power generation.

Another significant characteristic of the Emerson 848T is its configurable output options. Users can choose from a range of output signals, including 4-20 mA, which provides a standard interface for integration into existing control systems. Additionally, it offers a HART communication protocol, allowing for easy configuration, calibration, and diagnostics through a digital interface. This feature enhances the transmitter's usability, enabling operators to perform adjustments without direct access to the device.

The device is designed with user-friendliness in mind. Its intuitive setup procedure and robust graphical user interface simplify the commissioning process, ensuring that even those new to the technology can easily navigate the system. An integrated LCD display provides real-time readings and status information, facilitating monitoring at a glance.

In summary, the Emerson 848T temperature transmitter combines reliable performance, user-friendly design, and advanced digital technologies. Its dual-channel capability, wide sensor compatibility, and adjustable output options make it an essential tool for achieving precise temperature measurements in various industrial settings. With these compelling features, the Emerson 848T stands out as a leading choice for professionals seeking accuracy and efficiency in their temperature monitoring applications.