Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA October 2011

GROUNDING

The 848T transmitter provides input/output isolation up to 620 V rms.

 

 

 

 

NOTE

 

 

Neither conductor of the fieldbus segment can be grounded. Grounding out

 

one of the signal wires will shut down the entire fieldbus segment.

 

 

 

Shielded Wire

 

Each process installation has different requirements for grounding. Use the

 

grounding options recommended by the facility for the specific sensor type or

 

begin with grounding option 1 (most common).

 

Ungrounded Thermocouple, mV, and RTD/Ohm Inputs

 

Option 1:

 

1.

Connect 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 shield at the power supply end.

 

4.

Ensure that the sensor shield(s) is electrically isolated from the

 

 

surrounding grounded fixtures.

Sensor Wires

 

 

Power

848T

 

Supply

 

 

 

 

 

 

 

 

 

 

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 signal wiring shield at the power supply end.

Sensor Wires

 

 

Power

848T

 

Supply

 

 

 

 

 

 

 

 

 

 

Shield ground points

2-8

Page 18
Image 18
Emerson 848T manual Grounding, Shielded Wire

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.