704-5010-131 Datasheet, PDF (1/12 Pages) Magnetrol International, Inc. – Horizon™ Model 704 Guided Wave Radar Level Transmitter

Horizon^™
Model 704
Guided Wave Radar
Level Transmitter
DESCRIPTION
The Horizon Model 704 Transmitter is an intermediately
priced 24 VDC, loop-powered, liquid level transmitter
based upon Guided Wave Radar (GWR) technology.
The transmitter is designed to provide all of the
performance advantages of GWR. Available in a non-
rotatable, single compartment plastic or aluminum
housing, this transmitter offers simple configuration
with three push buttons and a 2-line × 8 character
liquid crystal display. The Model 704 covers a broad
application range by utilizing coaxial and twin rod
probes.
TECHNOLOGY
Horizon Guided Wave Radar is based upon Time
Domain Reflectometry (TDR). TDR utilizes pulses of
high frequency electromagnetic energy transmitted
down a probe. When a pulse reaches a surface that has
a higher dielectric than the vapor space in which it is
traveling, the pulse is reflected. High-speed timing
circuitry precisely measures the total transit time and
provides an accurate measure of the liquid level.
APPLICATIONS
MEDIA: Liquids or slurries; hydrocarbons to water-
based media (dielectric constants from 1.7 to 100)
VESSELS: Most process or storage vessels up to rated
probe temperature and pressure
CONDITIONS: Virtually all level measurement and con-
trol applications including those process conditions
exhibiting visible vapors, turbulence and varying dielec-
tric media or specific gravity
FEATURES
• Two-wire, 24 VDC, loop-powered transmitter
• HART^® communications (optional)
• Varying dielectric constant or specific gravity
will have minimal effect on performance
• Probe designs up to +400° F (+200° C),
1000 psig (70 bar)
• Available with coaxial and twin rod probes
• No calibration or level movement required
• 16 foot (4.8 meter) measuring range
• Lexan^® or Cast aluminum housings
• IS, XP, and Non-Incendive approvals
• Optional 2-line × 8 character LCD and 3-button
keypad