LEVEL MEASUREMENT SOLUTIONS Echotel® Model 355 is a two-wire, loop-powered, non-contact 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 x 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, rapid level changes, or echoes from false targets exist. 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. • Chemical storage tanks • Pond or river level monitoring • Paint, ink and solvent tanks • Industrial wastewater processing • Volume in batch and day tanks • Open channel flow weirs and flumes • 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 • Menu-driven 4-push-button, 2-line x 16-character LCD user interface • Patent-pending temperature compensated echo rejection technique identifies true echo from surface • Two 7-digit flow totalizers, one resettable, and one non-resettable • Common tank shapes and 20-point custom table for fast and accurate volume configuration • 60 kHz transducer with 10° beam angle and 10" • Dynamic baseline noise compensation provides reliable performance in the presence of electromagnetic noise • Generic Discharge Flow Equation and 35 flume/weir primary elements for open channel f

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: 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...

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...

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...

Warm-up Time 25 seconds Performance is based on a reference operating condition of an ambient temperature of +60 to +77 °F (+15 to +25 °C), 45 to 75% relative humidity, transducer vertically aligned over an ideal reflecting surface, and no false targets within the ultrasonic beam angle.

DIMENSIONAL SPECIFICATIONS INCHES (MM) 2.02 (51) Cast Aluminum Housing with Kynar® or Polypropylene Transducer Lexan® Housing with Kynar or Polypropylene Transducer AGENCY APPROVALS AGENCY APPROVED MODELS PROTECTION METHOD AREA CLASSIFICATION Intrinsically Safe FM20US0110X/FM20CA0052X Class I, Div. 1; Groups A, B, C, & D Type 4X, IP66, T4 -40°C ≤ Ta ≤ +70°C ➀ FM20US0110X/FM20CA0052X Class I, Div. 1; Groups A, B, C, & D IP67, T4 -40°C ≤ Ta ≤ +70°C ➀ FM20US0110X/FM20CA0052X Class I, Div. 2; Groups A, B, C, & D IP66/IP67, T4 ➁ -40°C ≤ Ta ≤ +70°C ➀ FM20ATEX0028X/IECEx FMG 20.0030X II 1/2 G Ex db...

1 2 3 | BASIC MODEL NUMBER Ultrasonic transmitter for level, volume and open channel flow

The quality assurance system in place at AMETEK LMS guarantees the highest level of quality throughout the company. AMETEK LMS is committed to providing full customer satisfaction both in quality products and quality service. The AMETEK LMS 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. All AMETEK LMS electronic level and flow controls are warranted free of defects in materials or workmanship for eighteen months from the date of original factory shipment....