Application Note

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From the Fluke Digital Library @ www.fluke.com/library

Application Note

Introduction

In today’s process plants, most

new ﬁeld instruments are smart

digital instruments. Smart

implies a microprocessor-based

instrument with extra function-

ality and digital compensation,

supporting multiple sensor types

or multiple variables. These

instruments generally offer

better accuracy, long-term sta-

bility, and reliability than con-

ventional analog instruments.

The most common class of

smart instruments incorpo-

rates the HART protocol, with

more than ﬁve million HART

instruments in use in 100,000

plants worldwide. HART, an

acronym for Highway Address-

able Remote Transducer, is an

industry standard that deﬁnes

the communications protocol

between smart ﬁeld devices and

a control system that employs

traditional 4-20 mA wiring.

Two capabilities are required

to properly service HART instru-

ments: precision analog source

and measure capability and

digital communication capabil-

ity. Until recently, this required

two separate tools, a calibrator

and a communicator. Today, the

capabilities of those two tools

are available in a single HART

Documenting Process Calibra-

tor that can help you quickly

and effectively service HART

instruments.

HART

Transmitter

Calibration

Summary of content (8 pages)

PAGE 1
HART ® Transmitter Calibration Application Note Introduction In today’s process plants, most new field instruments are smart digital instruments. Smart implies a microprocessor-based instrument with extra functionality and digital compensation, supporting multiple sensor types or multiple variables. These instruments generally offer better accuracy, long-term stability, and reliability than conventional analog instruments.
PAGE 2
HART calibration is required! 3. Quality programs such as ISO 9000 standards for all instruments that impact product A common misconception is quality. that the accuracy and stability 4. Commercial requirements of HART instruments eliminate such as weights, measures, the need for calibration. Another and custody transfer. misconception is that calibraRegular calibration is also tion can be accomplished by reprudent since performance ranging field instruments using only a HART communicator.
PAGE 3
Analog Measure Value Analog Source Value Model Number Tag ID PV (Primary Variable) PV LRV (Primary Variable Lower Range Value) PVAO (Digital representation of the Primary Variable Analog Output) PV URV (Primary Variable Upper Range Value) Figure 2. New tool speeds calibration Today, instrument maintenance is moving out of the shop and into the field. This reduces process interruptions and avoids the time and expense of returning instruments to the shop.
PAGE 4
Process • View process variables • View variable map • Re-map process variables (Dual sensor temperature devices) Basic Detailed (coriolis) • Keypad input • Adjust URV, LRV to applied values • Tag • PV units • LRV, URV • Damping • Transfer function Sensor 1 • Sensor serial number • Sensor lower and upper limits • Sensor minimum span Temperature devices only: • Change Sensor Type • Change Sensor Connections • Config Sensor • Config Output Sensor Device Identification Setup • Software Version • Fin
PAGE 5
Example 1 2. Press the key again and you are prompted to select the 754 configuration (Figure Calibration of a 6). Selecting MEAS mA, Rosemount 3051 HART SOURCE mbar will configure Pressure Transmitter the calibrator to measure the analog mA output and Basic connections the pressure being applied This example assumes that simultaneously to the transthe transmitter is isolated from mitter input and the pressure the process and is not electrimodule.
PAGE 6
5. If the As Found test failed the 3051 to trim the output (i.e., there were highlighted section for the 4 mA value. errors in the error sumPress Continue for the mary table), adjustment is 20 mA trim and repeat this necessary. Press the Adjust step. softkey. Select Sensor Trim 8. After completing Output Trim, and press . (Do not select press the Done softkey and Pressure Zero Trim. It is the proceed with the As Left same as trimming the lower verification test.
PAGE 7
Procedure 1. Power on the Fluke 754 Calibrator. Press the red key followed by the Loop Power softkey. Press to bypass the warning screens and the 754 will display the basic HART information for the 3144 (Figure 11). 4. Press the Auto Test soft7. Select Output Trim and key to begin calibration. press . The value of the Once the test is complete, primary variable (PVAO) is an error summary table is in the upper right corner of displayed (Figure 13). Test the display. (Figure 5).
PAGE 8
Note on Uploading Results to Your PC If you are using a 743/744 or 753/754, you may choose an instrumentation management software package from this list: Fluke DPC/TRACK2™ AMS from Emerson Process Management, (formerly Fisher-Rosemount). PRM (Plant Resource Manager) from Yokogawa Electric Corporation. All trademarks are the property of their respective holders.