Echotel® Model 355 Non-Contact Ultrasonic Two-Wire Transmitter for Level, Volume, or Open Channel Flow DESCRIPTION Echotel® Model 355 is a two-wire, loop-powered, noncontact ultrasonic transmitter that performs liquid level, volume, and open channel flow measurement. Model 355 Transmitters feature a powerful 60 kHz ultrasonic transducer and advanced digital signal processing to reliably measure out to a 20 feet (6 m) maximum range. The Model 355 provides unsurpassed ease of configuration with either the menu-driven 4-push-button, 2-line × 16-character display, HART ® digital communications, or PACTware™. This enables a complete configuration to be performed via the local user interface, or remotely with the extra capability of capturing echo wave forms, and viewing trend data, diagnostic conditions, and all transmitter configuration parameters. The integral mount electronics are housed in either a cast aluminum housing or Lexan ® thermoplastic housing. The intelligent electronics analyze the ultrasonic echo profile, apply temperature compensation, reject echoes from false targets, and then processes the true echo from the liquid surface. This results in an extremely reliable measurement even when applications difficulties like turbulence and false echoes exist. Cast aluminum housing with Kynar Flex® transducer Lexan® housing with polypropylene transducer FEATURES • Two-wire, loop-powered transmitter for level, volume and open channel flow measurement • Maximum range of 20 feet (6 meters) • PACTware PC program using HART Communications for remote configuration and troubleshooting The 60 kHz ultrasonic transducer is offered in polypropylene, or Kynar® Flex for superior performance in harsh environments. These powerful transducers feature a 10° conical beam and 10" (250 mm) blocking distance to maximize measurement capabilities in a wide variety of applications. • Temperature compensated echo rejection profile identifies true echo from liquid surface APPLICATIONS • Two 7-digit flow totalizers, one resettable, and one non-resettable • Chemical storage tanks • Common tank shapes and 20-point custom table for fast and accurate volume configuration • Vessels with highly viscous media • Paint, ink and solvent tanks • Industrial wastewater processing • Volume in batch and day tanks • Open channel flow weirs and flumes • Menu-driven 4-push-button, 2-line × 16-character LCD user interface • 60 kHz transducer with 10° beam angle and 10" (250 mm) blocking distance • Dynamic baseline noise compensation provides reliable performance in the presence of electromagnetic noise • Generic Discharge Flow Equation and 53 flume/weir primary elements for open channel flow applications TECHNOLOGY Non-contact ultrasonic measurement is obtained by emitting an ultrasonic pulse from the transducer and measuring the time required for the echo to reflect from the liquid surface and return to the transducer. The Model 355 measures the time of the round trip pulse, and calculates the distance using the equation: V T D= a 2 D = Distance to target Va = Velocity of sound through air (1,128 ft/sec.) T = Time for one round trip sound pulse Since the speed of sound is temperature dependent, the transducer also measures the temperature at the transducer to provide compensation for changing air temperatures. Level is computed by the 355 electronics using the measured distance and the configuration data that has been entered for the vessel dimensions. By inputting the type and geometry of a vessel, the electronics can calculate the liquid volume in the vessel. In a similar operation, the Model 355 can perform open channel flow measurement by converting the level reading into units of volume per time. Common tank shapes, flumes and weirs are stored in the 355 software. A 20-point custom table is also available for unusual tanks or primary flow elements. Model 355 Flow Blocking Distance Distance (measured) Range Parshall Flume Level (range - distance) Level/Volume Application Open Channel Flow Application PERFORMANCE Model 355 Transmitters are high performance units that feature a powerful 60 kHz transducer, and advanced digital signal processing. These features allow the 355 to accurately track the liquid level in difficult applications involving agitation and light foam. The narrow 10° beam angle, shown on the right, allows the 355 to be used in applications where other units with wider beam angles fail due to false reflections from obstructions in the tank. 5 feet r=5.2 inches 10 feet r=10.5 inches 15 feet r=15.7 inches 20 feet r r=21.0 inches Beam Radius (r) vs. Distance 2 MEASUREMENT RANGE CALCULATIONS Ultrasonic non-contact transmitters are typically rated for a maximum range in ideal conditions. Experience has shown that the maximum range must be reduced for certain factors. Although the maximum range rating is somewhat conservative, each application must be evaluated for specific conditions in the tank. Several application parameters that affect ultrasonic performance are shown in the tank at the right. Each of these parameters is assigned a Performance Multiplier in the chart below. Multiply the maximum potential range (20 feet) of the Model 355 by each of the applicable Performance Multipliers to calculate the maximum allowable range for the application. Beam spread interference Beam spread interference Vapors Foam Surface agitation PERFORMANCE MULTIPLIER OPERATING PARAMETER CONDITION SURFACE AGITATION: Surface agitation or waves can degrade the performance. Moderate agitation results in only slight degradation of performance. The worst case is when the surface is a good reflector, but in the wrong direction. Slight agitation, choppiness . . . . . . . . . . . . . . . . . . . . .0.9 Smooth, glass-like surface . . . . . . . . . . . . . . . . . . . . . .1.0 Heavy agitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.8 Slight vortex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.7 VAPORS AND STEAM: Vapors can cause problems when the liquid process temperature is well above the temperature of the airspace. The greater the difference, the more expected vapor problems. The problems result from condensation or layering in the sound path, both of which attenuate the sound signal, and degrade performance. If a vent is used, be sure that it is well away from the transducer. BEAM SPREAD INTERFERENCE: It is recommended that no obstructions, such as ladder rungs, fill pipes, support struts, etc., be allowed within the 10° ultrasonic beam. If an obstruction is unavoidable, make it as far away as possible from the transducer. Interference from agitator blades is only an intermittent interference that usually has little effect on performance. A special software algorithm can also help suppress false echoes from agitator blades that are within the beam angle. FOAM: Foam can attenuate the ultrasound and render the system inoperative. If possible, moving the transducer to an area in the tank where there is less foam will improve the performance. Thick, heavydensity foams can sometimes produce a reflection from the top of the foam. The multipliers shown at right are general guidelines. For further assistance consult the factory. No condensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0 Little condensation . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.9 Much condensation/ foggy appearance . . . . . . . . . . . .0.8 No interference within 5° half beam angle . . . . . . . . . .1.0 Agitator at speed less than 60 RPM . . . . . . . . . . . . . . .1.0 Agitator at speed greater than 60 RPM . . .Consult factory Interference outside 2°, far from transducer (in bottom third of range) . . . . . . . . . . . . . .0.8 Interference outside 2°, near to transducer (in top third of range) . . . . . . . . . . . . . . . . .0.5 No foam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0 Light froth, less than 0.25" thick . . . . . . . . . . . . . . . . . .0.8 Light foam, less than 0.5" thick . . . . . . . . . . . . . . . . . .0.5 Light foam, more than 1" thick . . . . . . . . . . . . . . . . . . .0.1 EXAMPLE: A slightly agitated 12-foot tank with no condensation, no interference, and a light froth on the surface. Maximum allowable range: 20' × 0.9 × 1.0 × 1.0 × 0.8 = 14.4 feet Since the maximum allowable range is 14.4 feet, the 355 is suitable for this 12-foot tank. NOTE: The multipliers shown above are general guidelines. For further assistance consult the factory. 3 LEVEL & VOLUME APPLICATIONS The Echotel Model 355 Transmitter utilizes an advanced, patent-pending signal processing technology to provide excellent performance in difficult process conditions. Dynamic baseline noise compensation, temperature compensated echo rejection, and extensive self-diagnostics all combine to provide extremely reliable level and volume measurement. Temperature Compensated Echo Rejection Ultrasonic transmitters use temperature compensation to adjust for speed-of-sound changes throughout the operating temperature range of the transducer; however, most transmitters do not apply this compensation to their false target rejection scheme. This can result in unreliable level measurement when the temperature inside the tank changes, and the echo rejection profile contracts or expands. The Model 355 has a patent-pending echo rejection technique that constantly adjusts the rejected echo profile based on the current sound propagation velocity. This technique keeps the transmitter tracking the actual liquid level as opposed to false targets even when temperature changes alter the shape of the echo rejection profile. Dynamic Baseline Noise Compensation Electromagnetic and acoustical noise can adversely affect instrumentation by decreasing the signal-to-noise ratio, and degrading overall measurement performance. The Model 355 continuously monitors for the presence of excessive electrical noise. If noise levels are above a set limit, the electronics will dynamically adjust the baseline to compensate for the electrical interference. This dynamic baseline adjustment enables the 355 to keep tracking the proper echo even in the presence of excessive electrical noise. Stored Tank Shapes for Volume Volume configuration with the 355 is as easy as selecting the tank shape and inputting 1–3 dimensions. While a 20-point custom table is also available, selecting the actual tank shape provides for a fast and accurate configuration for a variety of common tanks shapes. OPEN CHANNEL n Q=K(L-CH)H Model 355 Flow Parshall Flume FLOW APPLICATIONS Extensive Selection of Primary Flow Elements With a total of 53 flume and weir curves stored in the electronics, it would be hard to find an open channel flow application that cannot be handled by the 355 transmitter. Unusual flow applications can readily be accomplished through the use of either the 20-point Custom Table or the Generic Discharge Flow Equation which allows a direct entry of unique flow equations. Dual Flow Totalizers Two 7-digit flow totalizers are provided for recording flow in cubic feet, gallons, million gallons, liters, million liters, or cubic meters. One totalizer is resettable and the other is non-resettable. Several multipliers are selectable to allow for proper scaling. Totalizer time is also recorded to show how long each totalizer has been recording flow. 4 ELECTRONICS Supply Voltage SPECIFICATIONS XP & GP 16 to 36 VDC IS 16 to 28.6 VDC IS Entity Parameters FM/FMc Vmax = 28.6 V, Imax = 140 mA Pmax = 1.0 W, Ci = 5.5 nF, Li = 9.4 µH ATEX Ui = 28.4 V, li = 94 mA, Pi = 0.67 W Ci = 5.5 nF, Li = 370 µH Power Consumption Less than 1 Watt Output Type 4–20 mA with optional HART digital signal Range 3.8 to 20.5 mA useable Diagnostic Alarm Selectable from 3.6 mA, 22 mA or HOLD Damping Adjustable from 1–60 Digital Communication HART version 5.x compatible Display 2-line x 16-character LCD Keypad 4-push-button menu-driven Ambient Temperature -40° to +175° F (-40° to +80° C) Housing Material Cast aluminum or Lexan Cable Entry Two ¾" NPT or M20 entries TRANSDUCER SPECIFICATIONS Maximum Range 20 feet (6 meters) Minimum Range 13 inches (330 mm) Blocking Distance 10 inches (250 mm) Frequency 60 kHz Process Connection 2" NPT Process Temperature -40º to +175º F (-40º to +80º C) Process Pressure 0 to 43.5 psig (0 to 3 bar) Material Kynar® Flex (PVDF) or polypropylene Beam Angle 10º conical PERFORMANCE SPECIFICATIONS Accuracy Greater of ± 0.2% of range or 0.24 inch (6 mm) Repeatability ± 0.125 inch (± 3 mm) Resolution 0.1 inch (2.5 mm) Linearity ± 0.4 inch (±10 mm) Response Time Less than 1 second (typical) Warm-up Time 30 seconds Performance is based on a reference operating condition of an ambient temperature of +60º to +77º F (+15º to +25º C), 45 to 75% relative humidity, transducer vertically aligned over an ideal reflecting surface, and no false targets within the ultrasonic beam angle. 5 AGENCY AGENCY FM C US ATEX APPROVALS MODEL PROTECTION METHOD AREA CLASSIFICATION 355-5X0A-11R 355-5X0A-10R Intrinsically Safe 355-5X0A-1XX Intrinsically Safe 355-5X0A-1XX Non-Incendive 355-5X0A-AXX Intrinsically Safe 355-5X0A-C0R 355-5X0A-C1R Explosion Proof Class I, Div. 1; Groups A, B, C, & D Type 4X, IP66, T4 @80°C Entity Class I, Div. 1; Groups A, B, C, & D IP67, T4 @80°C Entity Class I, Div. 2; Groups A, B, C, & D IP67, T4 @80°C ATEX II 1 G Ex ia IIC T4 @70°C ISSeP09ATEX013X (EN 60079-0, EN 60079-11 & EN 60079-26 standards applied) ATEX II 1/2 G Ex ma/d IIC T6 @70°C Ga/Gb ISSeP09ATEX009X (EN 60079-0, EN 60079-1, EN 60079-18 & EN 60079-26 standards applied) Measured media inside vessel must be non-flammable only. Process temperature must not increase the internal temperature of the These units have been tested to EN 61326 and are in compliance with the EMC Directive 2004/108/EC. electronics above +176° F (+80° C). The transmitter should be installed such that in the event of rare incidents, the aluminum enclosure cannot be an ignition source due to impact or friction, and that electrostatic discharges on plastic parts are prevented. DIMENSIONAL INCHES SPECIFICATIONS (mm) 2.18 (52) 2.02 (51) 3.99 (101) 2.48 (63) 2.48 (63) 4.06 (103) 4.06 (103) M20 or 3/4" NPT Conduit Opening Cast Aluminum Housing with Kynar® or Polypropylene Transducer 2" NPT 3.26 (83) 2" NPT 3.26 (83) 1.50 (38) 1.50 (38) 1.90 (48) Diameter 1.90 (48) Diameter 2.25 (57) 3.78 (96) 2.25 (57) 1.65 (42) 1.65 (42) 3.26 (83) 3.26 (83) M20 or 3/4" NPT Conduit Opening 2" NPT 2" NPT 3.26 (83) 3.26 (83) 1.50 (38) 1.50 (38) 1.90 (48) Diameter 6 1.90 (48) Diameter Lexan® Housing with Kynar or Polypropylene Transducer MODEL NUMBER Quick shipment, usually within one week after factory receipt of a complete purchase order, through the Expedite Ship Plan (ESP). BASIC MODEL NUMBER 355 Ultrasonic transmitter for level, volume and open channel flow INPUT POWER 5 24 VDC two-wire loop-powered OUTPUT SIGNAL 0 1 4 –20 mA without HART® 4 –20 mA with HART OPTIONS 0 None ACCESSORIES A Digital display and keypad AGENCY APPROVALS 1 A C FM/FMc IS & Non-incendive ATEX IS EEx ia ATEX XP EEx d (only available with Housing codes 0 & 1, and Transducer code R) HOUSING/CONDUIT CONNECTION 0 1 6 7 Cast aluminum with ¾" NPT conduit connections Cast aluminum with M20 conduit connections Lexan® plastic with ¾" NPT conduit connections Lexan plastic with M20 conduit connections TRANSDUCER B R 3 5 5 5 0 2" NPT polypropylene 2" NPT Kynar® Flex A 7 QUALITY The quality assurance system in place at Magnetrol guarantees the highest level of quality throughout the company. Magnetrol is committed to providing full customer satisfaction both in quality products and quality service. The Magnetrol quality assurance system is registered to ISO 9001 affirming its commitment to known international quality standards providing the strongest assurance of product/service quality available. The Echotel Model 355 Ultrasonic Level Transmitter is available for quick shipment, usually within one week after factory receipt of a complete purchase order, through the Expedite Ship Plan (ESP). To take advantage of ESP, simply match the color coded model number codes (standard dimensions apply). ESP Expedite Ship Plan Models covered by ESP service are conveniently color coded in the selection data charts. ESP service may not apply to orders of ten units or more. Contact your local representative for lead times on larger volume orders, as well as other products and options. WARRANTY All Magnetrol electronic level and flow controls are warranted free of defects in materials or workmanship for one full year from the date of original factory shipment. If returned within the warranty period; and, upon factory inspection of the control, the cause of the claim is determined to be covered under the warranty; then, Magnetrol will repair or replace the control at no cost to the purchaser (or owner) other than transportation. Magnetrol shall not be liable for misapplication, labor claims, direct or consequential damage or expense arising from the installation or use of equipment. There are no other warranties expressed or implied, except special written warranties covering some Magnetrol products. 5300 Belmont Road • Downers Grove, Illinois 60515-4499 • 630-969-4000 • Fax 630-969-9489 • www.magnetrol.com 145 Jardin Drive, Units 1 & 2 • Concord, Ontario Canada L4K 1X7 • 905-738-9600 • Fax 905-738-1306 Heikensstraat 6 • B 9240 Zele, Belgium • 052 45.11.11 • Fax 052 45.09.93 Regent Business Ctr., Jubilee Rd. • Burgess Hill, Sussex RH15 9TL U.K. • 01444-871313 • Fax 01444-871317 Copyright © 2011 Magnetrol International, Incorporated. All rights reserved. Printed in the USA. Performance specifications are effective with date of issue and are subject to change without notice. Magnetrol & Magnetrol logotype and Echotel are registered trademarks of Magnetrol International HART is a registered trademark of the HART Communication Foundation PACTware is trademark of PACTware Consortium Lexan is a registered trademark of Savic Innovative Plastics Kynar is a registered trademark of Arkema, Inc. BULLETIN: 51-161.0 EFFECTIVE: May 2009