57-134 Horizon Guided Wave Radar Techology Brochure

H O R I Z O N™ G U I D E D
W A V E
R A D A R
An Introduction To Horizon Guided Wave Radar
H
orizon transmitters utilize Guided Wave Radar
pioneered its use for liquid level measurement with the
(GWR) technology for unsurpassed accuracy and relia-
introduction of the Eclipse® Model 705 transmitter in
bility in monitoring liquid levels. Though GWR technol-
1998. No other level measurement technology has cap-
ogy was first employed for the detection of under-
tured the attention of the process control industry the
ground cable breaks as early as the 1930s, Magnetrol
way Eclipse has in the short time since its introduction.
In 2003, the Horizon transmitter was intro-
HOW GUIDED WAVE RADAR WORKS
Pulses
Generated
Pulses
Reflected
Horizon transmitters
generate pulses of
electromagnetic
energy that are
transmitted down
the probe, or waveguide.
When they reach a
liquid surface that
has a higher dielectric than the air or
vapor in which they
travel, the pulses are
reflected.
Time converted
to Distance
The pulses’ transit
time is measured,
converted to distance, and can be
displayed on the
LCD as a level
reading.
duced to bring economical, general purpose guided wave radar transmitters to
industry.
Principle of Operation
Guided Wave Radar functions according to the principles of Time Domain
Reflectometry (TDR) and Equivalent Time
Sampling (ETS). As shown at left, a generated pulse of electromagnetic energy
travels down the probe. Upon reaching the
liquid surface the pulse is reflected. ETS
captures these signals in real time
(nanoseconds) and reconstructs them in
equivalent time (milliseconds) to make
level measurement a practical reality.
Unlike conventional radar, which
launches its signal into free air, Horizon
launches its signals within the sealed path
of its probe (wave guide) which is in
direct contact with the process media.
This direct contact makes the signal less
vulnerable to distortion brought on by
process conditions that might thwart
through-air technologies.
Horizon transmitters have been
designed to bring affordable Guided Wave
Radar level measurement to the process
industry. The Model 704 features the ability
to configure the transmitter without a
change in level. The Model 704 also offers
an easy to read two-line by eight-character
2
LCD, optional HART® communica-
transmitters offer sensor probes for routine
tions, and an adjustable diagnostic
storage vessels as well as those exhibiting
alarm.
corrosive vapors, foam, coating and buildup,
Horizon Transmitters
surface agitation, bubbling or boiling, high
Guided Wave Radar has demon-
fill/empty rates, low level and varying
strated an ability to provide accurate
dielectric or specific gravity.
and repeatable measurement at a
Affordable Guided Wave
performance level that surpasses
Horizon transmitters are designed to
many traditional technologies. This
work in applications in petroleum refining,
is due to the efficiency of Guided
chemical manufacturing, water & wastewater,
Wave Radar technology and to
pulp & paper, food & beverage, and phar-
Magnetrol’s wide range of sensing
probes designed to meet the process
variables discussed ahead.
Horizon accurately measures
liquids and slurries with a dielectric
range of 1.7 to 100 — from hydrocarbons to water-based media. The
transmitters perform in all conven-
maceutical processing. Horizon transmitters
Process Connected
Because the Guided
Wave Radar signal is
transmitted via the waveguide directly into the
process media, it is not
distorted by tank atmospheres, process conditions, tank obstructions,
or false echoes.
also serve as ideal retrofit transmitters made
possible by Magnetrol’s wide range of adaptation hardware for easy and affordable
replacement of antiquated level measurement technology.
Horizon transmitters have been
engineered to provide users with the basic
tional process and storage vessels,
range of measurement solutions in Guided
bridles and bypass chambers whose
Wave Radar. Horizon has emerged as the
temperatures and pressures are rated
affordable alternative in Guided Wave Radar
to the capabilities of the particular probe used. Horizon
measurement for today’s liquid level challenges.
I
HORIZON 704
The Horizon Model 704 is an
intermediate transmitter
which utilizes coaxial, single
rod and twin rod probes, as
well as Teflon®-coated,
3-A Hygienic and corrosionresistant specialty probes.
3
MODEL
704
GENERAL
S P E C I F I C A T I O N SŒ
Measured Variable
Liquid level
Signal Output
4–20 mA or 4–20 mA with HART
Span
6 to 192 inches (15 to 488 cm)
3.8 to 20.5 mA useable (meets NAMUR NE 43)
Resolution
Analog:
0.01 mA
Digital:
0.15 inch
Loop Resistance
550 Ω @ 24 VDC (20.5 mA)
Damping
Adjustable 0–10 seconds
Diagnostic Alarm
Adjustable 3.6 mA, 22 mA, HOLD
User Interface
3-button keypad and/or HART communications (optional)
Display
2-line × 8-character LCD
Power (at terminals)
12 to 28.6 VDC
Menu Language
English, German, French or Spanish
Housing Material
Aluminum A356T6 (< .25% copper) Valox®, UL94-V0 rating
Net and Gross Weight
Aluminum: 3.5 lbs. ( 1.59 kgs) / Plastic: 1.5 lbs. (.68 kgs)
H 6.5" × W 4.5" (H 165 mm × W 114 mm)
Overall Dimensions
ΠConsult the Horizon product bulletin (57-104) for specific hazardous location approvals.
MODEL
704
PERFORMANCE
Reference Conditions
SPECIFICATIONS
Reflection from liquid at +70° F (+20° C) with a 72" probe
Probes
7XA, 7XB, 7XF, 7XF-4, 7XF-E, 7XF-F
Linearity
7XA Probe:
±0.25 inch (6.3 mm)
7XB Probe:
±0.50 inch (12.7 mm)
7XF Probes:
±0.75 inch (19 mm)
Resolution
±0.15 inch (4 mm)
Repeatability
0.15 inch (4 mm)
Hysteresis
0.15 inch (4 mm)
Warm-up Time
< 5 seconds
Operating Temperature Range
Aluminum Housing:
-40° to +175° F (-40° to +80° C)
Plastic Housing:
-40° to +160° F (-40° to +70° C)
LCD Temperature Range
-5° to +160° F (-20° to +70° C)
Operating Temperature Effect
Approximately ±0.03% of probe length/°C
Process Dielectric Effect
< 0.5 inch (12.7 mm)
Humidity
0–99%, non-condensing
Electromagnetic Compatibility
Meets CE requirements (EN-50081-2, EN 50082-2)
(Single and Twin Rod probes must be used in metallic
vessel or stillwell to maintain CE requirement)
4
Transmitters for
Process-Specific
Solutions
7XA
STANDARD COAXIAL
• Coaxial design is the
most efficient probe in
the guided wave radar line
• Recommended for general
purpose applications with
clean, low-viscosity liquids
• Suitable for media with
dielectric as low as 1.7
• FM, CSA and ATEX
safety approvals
7XB
STANDARD TWIN ROD
• A general purpose probe
recommended for higher
viscosity applications of up
to 1500 cp
• Buildup of thick or dirty
media on the probe is well
managed by the twin rod
design
• Available in threaded or
flanged connections
• For dielectric ≥ 2.5
Model 7XA Standard Coaxial Probe
Model 7XB Standard Twin Rod Probe
Materials/Wetted Parts
Materials/Wetted Parts
Diameter
Process Connection
Length
316/316L SS (Hastelloy C and
Monel optional), TFE spacers,
Monel optional), TFE spacers,
Viton® O-rings
Viton® GFLT O-rings
.3125" (8 mm) ∅ rod
Diameter
Two .5" (13 mm) ∅ rods
3
⁄4" NPT and 1" BSP
Process Connection
.875" (22 mm) C Lto C L
2" NPT (Various ANSI or DIN flanges)
(Various ANSI or DIN flanges)
Length
24 to 192 inches (60 to 488 cm)
24 to 192 inches (60 to 488 cm)
Transition Zone
Top: 8" (+4" inactive) εr ≥ 2.0
Bottom: 6" εr = 2.0; 1" εr = 80
Max. Process Temp.
+400° F @ 200 psig
.875" (22 mm) ∅ tube
Transition Zone
Top: 1" εr = 1.4; 6" εr = 80
Bottom: 6" εr = 1.4; 1" εr = 80
Max. Process Temp.
+300° F @ 300 psig
Max. Process Pressure
1000 psig @ +70° F
(+150° C @ 20 bar)
Max. Viscosity
316/316L SS (Hastelloy C and
(+200° C @ 13 bar)
Max. Process Pressure
750 psig @ +70° F
(50 bar @ +20° C)
(70 bar @ +20° C)
Max. Viscosity
500 cp
Dielectric Range
≥ 2.5
Mounting Effects
Active Rod > 1" from any
Dielectric Range
≥ 1.7
Mounting Effects
None
Media Coating
Not recommended
1500 cp
surface or obstruction
Media Coating
Film: 3% max. error of coated
length with conductive media
Bridging: Not recommended
5
7XF
BARE SINGLE ROD
• Ideal for water-based media
such as paints or slurries
with a dielectric greater
than 10
• Bare probe design tolerates
significant probe coating
and buildup
• Designed for use in
applications that include
plant tanks, sumps, pits,
wells and open channels
7XF-4
NON-STICK PROBE
• PFA “self-lubricating”
Teflon® insulation covers
the 316 SS probe
• Recommended for highviscosity liquids such as
latex paints and adhesives
• Suitable for a broad range
of water-based media
applications
Model 7XF Single Rod Probe
Model 7XF-4 Non-Stick Single Rod Probe
Materials/Wetted Parts
Materials/Wetted Parts
316/316L SS (Hastelloy C and
Monel optional), TFE spacers,
(Hastelloy C and Monel optional),
Viton® GFLT O-rings
TFE spacers, Viton® GFLT O-rings
Diameter
.5" (13 mm) ∅ rod
Diameter
.5" (13 mm) ∅ rod
Process Connection
2" NPT or larger
Process Connection
2" NPT or larger
(Various ANSI or DIN flanges)
(Various ANSI or DIN flanges)
Length
24 to 192 inches (60 to 488 cm)
Length
24 to 192 inches (60 to 488 cm)
Transition Zone
Top: Not applicable
Transition Zone
Top: Not applicable
Deadband
Bottom: 1" εr > 10
Top: 12" (30 cm) minimum
Deadband
Bottom: 1" εr > 10
Top: 12" (30 cm) minimum
Max. Process Temp.
+300° F @ 400 psig
Max. Process Temp.
+300° F @ 400 psig
Max. Process Pressure
1000 psig @ +70° F
Max. Process Pressure
1000 psig @ +70° F (70 bar @ +20° C)
(70 bar @ +20° C)
Max. Viscosity
Not applicable
Max. Viscosity
Not applicable
Dielectric Range
≥ 10
Media Coating
Maximum error 10% of coated
(+150° C @ 27 bar)
(+150° C @ 27 bar)
Dielectric Range
≥ 10
Media Coating
Maximum error 10% of coated
length; error related to media
length; % error related to dielectric
dielectric, thickness of coating,
of media, thickness of coating, and
coated probe length above level
coated probe length above level
6
Teflon® coated 316/316L SS
7XF-E
HYGIENIC PROBE
7XF-F
CORROSION RESISTANT
Horizon 704
with Valox
housing
• Engineered for the food &
beverage, pharmaceutical,
biotech, and semiconductor
industries
• Probe and Tri-Clover process
connection are free of crevices
and structural intricacies where
bacteria may harbor and grow
®
• All wetted surfaces are polished
to a 20 Ra rating
• 3-A Authorized for hygienic use
• Measures acids, caustics
and other aggressive
media cost-effectively
• Faced-flange design
creates a vapor barrier
that protects the metal
process connection and
all wetted parts
• PFA Teflon®-covered probe
is a cost-effective alternative
to expensive acid-resistant
alloys
Model 7XF-E Hygienic Single Rod Probe
Model 7XF-F Corrosion Resistant Single Rod Probe
Materials/Wetted Parts
Materials/Wetted Parts
316/316L SS with a 20 Ra surface
finish (Hastelloy C, Monel optional),
PFA Teflon® coated 316/316L SS
(Hastelloy C and Monel optional),
TFE spacers, Viton® O-rings
TFE spacers, Viton® O-rings
Diameter
.5" (13 mm) ∅ rod
Diameter
.5" (13 mm) ∅ rod
Process Connection
2", 3" and 4" Tri-Clover style,
Process Connection
2" NPT or larger
(Various ANSI or DIN flanges)
16 AMP hygienic fitting
Length
24 to 192 inches (60 to 488 cm)
Length
24 to 192 inches (60 to 488 cm)
Transition Zone
Top: Not applicable
Transition Zone
Top: Not applicable
Deadband
Bottom: 1" εr > 10
Top: 12" (30 cm) minimum
Deadband
Bottom: 1" εr > 10
Top: 12" (30 cm) minimum
Max. Process Temp.
+300° F @ 75 psig
Max. Process Temp.
+300° F @ 400 psig
Max. Process Pressure
75 psig @ +70° F (5 bar @ +20° C)
Max. Viscosity
Not applicable
(+150° C @ 27 bar)
(+150° C @ 5 bar)
Max. Process Pressure
(70 bar @ +20° C)
Not suitable for vacuum
Dielectric Range
≥ 10
Media Coating
Maximum error 10% of coated
1000 psig @ +70° F
Max. Viscosity
Not applicable
Dielectric Range
≥ 10
Media Coating
Maximum error 10% of coated
length; % error related to dielectric
length; % error related to dielectric
of media, thickness of coating, and
of media, thickness of coating, and
coated probe length above level
coated probe length above level
7
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Viton® is a registered trademark of DuPont Performance Elastomers, Teflon® is a registered trademark of DuPont,
Hastelloy® is a registered trademark of Haynes International, Inc., Monel® is a registered trademark of Special Metals Corporation,
Tri-Clover® is a registered trademark of Tri-Clover, Inc.
Copyright © 2010 Magnetrol International. All rights reserved. Printed in the USA.
Bulletin: 57-134.1 • Effective: July 2010