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Procedural Considerations
CAUTION! WARNING!
In some cases, the use of a field communicator with a transmitter that is connected on-line can have an
adverse effect on process operations.
Before using the MC Toolkit, be certain that you know the potential consequences of each procedure, and
that you use the appropriate safeguards to prevent problems. For example, if the transmitter is an element
of a control loop, the loop should be placed in the manual operating mode, and alarms and interlocks
("trips") should be disabled as appropriate before beginning the procedure.
The primary factors to be considered are separated into three categories under the following three headings.
The information under the following headings is intended as background for use of the DE Procedures and
HART Procedures, which are given in separate sections of this manual.
Transmitter Type and Communication Mode
The MC Toolkit can be used with various types of field transmitters, most of which can be operated in
more than one mode.
•
Honeywell DE transmitter operating in Smart Analog Mode
•
Honeywell DE transmitter operating in Digital Enhanced (DE) Mode
•
Honeywell (and other) HART transmitter operating in point-to-point (Analog w/ HART digital mode)
•
Honeywell (and other) HART transmitter operating in multi-drop (HART-only digital mode)
The salient characteristics of each item listed, and the implications of each characteristic in procedures are
described under Transmitter/Communications Characteristics
Type of Procedure and Prerequisites
The MC Toolkit is designed to provide three basic functions:
•
Monitoring
•
Configuration
•
Calibration
Depending on combinations of factors such as transmitter type, and communications mode, some
procedures such as monitoring the performance of a transmitter can be straightforward and innocuous, but
in some cases can also require special preparation and precautions.
Special Equipment and/or Environment for Calibration
Typically, a smart transmitter delivered by a major manufacturer today is designed to provide a high degree
of precision throughout its operating range, and has been calibrated to a high level of accuracy that is not
easy to duplicate in the user's plant process areas. Moreover, the design, materials, and manufacturing
process employed will ensure that the instrument will stay within calibration limits for an extended period.
Typically, calibration of a process-connected transmitter will degrade, rather than augment, the capability
of a smart transmitter. For this reason, the calibration procedures in this MC Toolkit User Manual include
a recommendation that the transmitter is removed from service and is calibrated only in a controlled
laboratory environment, using equipment whose precision is certified.
Release 3
9/06
34-ST-25-20 MC Toolkit User Manual
Introduction
3
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