Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

WIRING

If the sensor is installed in a high-voltage environment and a fault condition or

 

installation error occurs, the sensor leads and transmitter terminals could

 

carry lethal voltages. Use extreme caution when making contact with the

 

leads and terminals.

NOTE

Do not apply high voltage (e.g. AC line voltage) to the transmitter terminals.

Abnormally high voltage can damage the unit (bus terminals are rated to 42.4

VDC).

Figure 2-3. 848T Transmitter

Field Wiring

 

6234 ft (1900 m) max

 

(depending upon cable

Integrated Power

characteristics)

Conditioner

Terminators

and Filter

 

(Trunk)

Power

Supply

FOUNDATION

fieldbus Host or

configuration tool

(Spur)

(Spur)

Signal Wiring

 

 

 

 

 

 

 

 

Devices 1 through 16*

 

* Intrinsically safe installations may allow fewer devices per I.S. barrier

 

 

 

Connections

The 848T transmitter is compatible with 2 or 3-wire RTD, thermocouple, Ohm,

 

and millivolt sensor types. Figure 2-4shows the correct input connections to

 

the sensor terminals on the transmitter. The 848T can also accept inputs from

 

analog devices using the optional analog input connector. Figure 2-5shows

 

the correct input connections to the analog input connector when installed on

 

the transmitter. Tighten the terminal screws to ensure proper connection.

Figure 2-4. Sensor Wiring

 

 

 

 

 

 

 

 

 

 

 

Diagram

 

 

 

 

 

 

 

 

 

 

 

 

1 2

3

1

2

3

1

2

3

1

2

3

 

2-wire

3-wire

Thermocouples /

2-Wire RTD

 

RTD and

RTD and

Ohms and

 

with

 

Ohms

Ohms*

Millivolts

Compensation

 

 

 

 

 

 

 

 

 

Loop**

*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.

**The transmitter must be configured for a 3-wire RTD in order to recognize an RTD with a compensation loop.

2-4

Page 14
Image 14
Emerson 848T manual Wiring, Connections, Leads and terminals, Conditioner Terminators Filter Trunk

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.