Brochure

Why use “smart” instrumentation?
Like most process plants, your organization is
probably facing the dual challenges of maximiz-
ing productivity while minimizing maintenance
costs. “Smart” digital transmitters offer superior
performance and reliability, while saving time and
effort in maintenance and calibration. Manufactur-
ers of field instruments have helped accelerate the
changeover by offering smart transmitters at prices
nearly as low as analog units. As digital instru-
ments using the HART protocol quickly become
the standard, communicators and calibrators are
becoming essential everyday tools.
What is HART?
HART, the Highway Addressable Remote Trans-
ducer protocol, uses a 1200 baud Frequency Shift
Keying (FSK) signal to superimpose digital informa-
tion on the conventional 4-20 mA analog signal.
Why use the HART protocol?
HART is an industry standard developed to define
the communications protocol between intelligent
field devices and a control system, HART is the
most widely used digital communication protocol
in the process industry. More than five million
HART field instruments are installed in more than
100,000 plants worldwide.
The HART protocol:
• Is supported by all of the major suppliers of
process field instruments supported by the HART
Communication Foundation, an industry-wide
non-profit organization. See the
http://www.hartcomm.org for information on the
HART standard.
• Preserves present control strategies.
• Allows traditional 4-20 mA signals and digital
communication to share the same two-wire
loops.
• Provides important information for installation
and maintenance: Tag IDs, measured values,
range and span data, product information and
diagnostics.
• Reduces operation costs by making it easier
to manage and fully utilize “smart” instrument
networks.
The Fluke-789 doubles your power giving you a
multimeter and a loop calibrator in one tool.
Key 789 features:
• 24 V loop power supply
• HART mode setting with loop power
(adds 250 ohm resistor)
• 200 % larger dual display
• mA drive up to 1,200 ohms
• Enhanced backlight with (2) brightness settings
• Improved battery power with (4) AA batteries
• 0 % to 100 % mA Span Check buttons to toggle
from 4 mA to 20 mA
• Infrared I/O serial port compatible with
FlukeView Software
• 5 V measurement capability on the 4 V range
for precise 1 V to 5 V measurements
• DMM designed to meet 1000 V IEC 1010
CAT III standards
• Precision 1000 V, 400 mA digital multimeter
Measure ac and dc volts, ac and dc current,
resistance, continuity and frequency
• True-rms ac voltage measurement
• Frequency measurement to 20 kHz
• 20 mA dc current source/loop calibrator/simulator
Manual Step (100 %, 25 %, Coarse, Fine) plus
Auto Step and Auto Ramp
• Externally accessible battery for easy battery
changes
• V overload protection on V, ohms, frequency, mA
(backed up by 440 mA 1000 V fuse)
Fluke 789
ProcessMeter
™
6 Fluke Corporation 750 Series Brochure