Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Table D-1. Analog Input Function Block Parameters

Number

Parameter

Units

Description

36

LO_LO_ALM

None

The LO LO alarm data, which includes a value of the alarm, a timestamp of

 

 

 

occurrence and the state of the alarm.

37

OUT_D

None

Discrete output to indicate a selected alarm condition.

38

ALM_SEL

None

Used to select the process alarm conditions that will cause the OUT_D parameter to

 

 

 

be set.

39

STDDEV

% of OUT Range

Standard deviation of the measurement for 100 macrocycles.

40

CAP_STDDEV

% of OUT Range

Capability standard deviation, the best deviation that can be achieved.

FunctionalitySimulation

Figure D-1. Analog Input Function Block Timing Diagram

To support testing, either change the mode of the block to manual and adjust the output value, or enable simulation through the configuration tool and manually enter a value for the measurement value and its status. In simulation, the ENABLE jumper must be set on the field device.

NOTE

All FOUNDATION fieldbus instruments have a simulation jumper. As a safety measure, the jumper has to be reset every time there is a power interruption. This measure is to prevent devices that went through simulation in the staging process from being installed with simulation enabled.

With simulation enabled, the actual measurement value has no impact on the OUT value or the status.

OUT (mode in man)

OUT (mode in auto)

PV

63% of Change

FIELD_VAL

Time (seconds)

PV_FTIME

D-3

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Emerson 848T manual FunctionalitySimulation, OUT mode in man, OUT mode in auto, 63% of Change, Time seconds

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.