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 S 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 Consult 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 CORPORATE HEADQUARTERS 5300 Belmont Road • Downers Grove, Illinois 60515-4499 USA Phone: 630-969-4000 • Fax: 630-969-9489 magnetrol.com • [email protected] EUROPEAN HEADQUARTERS Heikensstraat 6 • 9240 Zele, Belgium Phone: 052 45.11.11 • Fax: 052 45.09.93 BRAZIL: Av. Dr. Mauro Lindemberg Monteiro • 185-Jd. Santa Fé, Osasco • São Paulo CEP 06278-010 CANADA: 145 Jardin Drive, Units 1 & 2 • Concord, Ontario L4K 1X7 CHINA: Plant 6, No. 191, Huajin Road • Minhang District • Shanghai 201109 DEUTSCHLAND: Alte Ziegelei 2–4 • D-51491 Overath DUBAI: DAFZA Office 5AE 722, P.O. Box 293671 • Dubai, United Arab Emirates INDIA: C-20 Community Centre • Janakpuri, New Delhi 110 058 ITALIA: Via Arese, 12 • 20159 Milano SINGAPORE: 33 Ubi Avenue 3 • #05-10 Vertex • Singapore 408868 UNITED KINGDOM: Regent Business Centre • Jubilee Road • Burgess Hill, West Sussex RH15 9TL 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