Reference Manual

00809-0100-4697, Rev EA October 2011

Accuracy

Rosemount 848T

Table 1. Input Options/Accuracy

 

 

 

Input Ranges

 

Accuracy Over Range(s)

Sensor Option

Sensor Reference

°C

°F

 

°C

°F

2- and 3-Wire RTDs

 

 

 

 

 

 

Pt 50 (

= 0.00391)

GOST 6651-94

–200 to 550

–328 to

1022

± 0.57

± 1.03

Pt 100 (

= 0.00391)

GOST 6651-94

–200 to 550

–328 to

1022

± 0.28

± 0.50

Pt 100 (

= 0.00385)

IEC 751; = 0.00385, 1995

–200 to 850

–328 to

1562

± 0.30

± 0.54

Pt 100 (

= 0.003916)

JIS 1604, 1981

–200 to 645

–328 to 1193

± 0.30

± 0.54

Pt 200 (

= 0.00385)

IEC 751; = 0.00385, 1995

–200 to 850

–328 to

1562

± 0.54

± 0.98

Pt 200 (

= 0.003916)

JIS 1604; = 0.003916, 1981

–200 to 645

–328 to 1193

± 0.54

± 0.98

Pt 500

 

IEC 751; = 0.00385, 1995

–200 to 850

–328 to

1562

± 0.38

± 0.68

Pt 1000

 

IEC 751; = 0.00385, 1995

–200 to 300

–328 to 572

± 0.40

± 0.72

Ni 120

 

Edison Curve No. 7

–70 to 300

–94 to

572

± 0.30

± 0.54

Cu 10

 

Edison Copper Winding No. 15

–50 to 250

–58 to

482

± 3.20

± 5.76

Cu 100 (a=428)

GOST 6651-94

-185 to 200

-365 to 392

± 0.48

±0.86

Cu 50 (a=428)

GOST 6651-94

-185 to 200

-365 to 392

± 0.96

±1.73

Cu 100 (a=426)

GOST 6651-94

-50 to 200

-122 to 392

± 0.48

±0.86

Cu 50 (a=426)

GOST 6651-94

-50 to 200

-122 to 392

± 0.96

±1.73

Thermocouples—Cold Junction Adds +

0.5 °C to Listed Accuracy

 

 

 

 

 

NIST Type B (Accuracy varies

NIST Monograph 175

100 to 300

212 to

572

± 6.00

± 10.80

according to input range)

 

301 to 1820

573 to 3308

± 1.54

± 2.78

NIST Type E

NIST Monograph 175

–200 to 1000

–328 to

1832

± 0.40

± 0.72

NIST Type J

NIST Monograph 175

–180 to 760

–292 to

1400

± 0.70

± 1.26

NIST Type K

NIST Monograph 175

–180 to 1372

–292 to

2501

± 1.00

± 1.80

NIST Type N

NIST Monograph 175

–200 to 1300

–328 to

2372

± 1.00

± 1.80

NIST Type R

NIST Monograph 175

0 to 1768

32 to 3214

± 1.50

± 2.70

NIST Type S

NIST Monograph 175

0 to 1768

32 to 3214

± 1.40

± 2.52

NIST Type T

NIST Monograph 175

–200 to 400

–328 to 752

± 0.70

± 1.26

DIN L

 

DIN 43710

–200 to 900

–328 to

1652

± 0.70

± 1.26

DIN U

 

DIN 43710

–200 to 600

–328 to 1112

± 0.70

± 1.26

w5Re26/W26Re

ASTME 988-96

0 to 2000

32 to 3632

± 1.60

± 2.88

GOST Type L

GOST R 8.585-2001

-200 to 800

-392 to 1472

± 0.71

± 1.28

Terminal Temperature

 

-50 to 85

-58 to 185

±3.50

± 6.30

Ohm Input

 

 

0 to 2000 ohms

 

± 0.90

ohms

Millivolt Input

 

-10 to 100 mV

 

± 0.05 mV

1000 mV

 

 

-10 to 1000 mV

 

± 1.0 mA

4–20 mA (Rosemount)(1)

 

4–20 mA

 

± 0.01 mA

4–20 mA (NAMUR)(1)

 

4–20 mA

 

± 0.01 mA

Multipoint Sensors(2)

 

 

 

 

 

 

(1)Requires the S002 option code.

(2)Multipoint (up to 8 points) thermocouples and RTDs are available for purchase with the Rosemount 848T. Input ranges and accuracy for these sensors will depend on the specific multipoint sensor chosen. For more information, contact your local Emerson representative.

Differential Configuration Notes

Differential capability exists between any two sensor types.

For all differential configurations, the input range is X to Y where

Accuracy for Differential Configurations:

X = Sensor A minimum - Sensor B max. Y = Sensor A maximum - Sensor B min.

If sensor types are similar (for example, both RTDs or both thermocouples), the accuracy = 1.5 times worst case accuracy of either sensor type. If sensor types are dissimilar (for example, one RTD and one thermocouple), the accuracy = Sensor 1 Accuracy + Sensor 2 Accuracy.

A-5

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Emerson 848T manual Accuracy, Input Ranges, Sensor Option Sensor Reference 3-Wire RTDs, Multipoint Sensors2

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.