سطح سنج های مایعات ابزارهای دقیق و مخصوصی هستند که برای اندازه‌گیری و نمایش سطح مایع در مخازن، مخازن ذخیره‌سازی، مخازن نفتی و گازی، چاه‌های حفاری، و سیستم‌های پمپاژ و استخراج مایعات استفاده می‌شوند.

برخی از انواع سطح‌سنج‌های مایعات عبارتند از:

سطح‌سنج‌های فشار دیافراگم: این نوع سطح‌سنج‌ها از فشار مایع بر روی دیافراگم استفاده می‌کنند تا سطح مایع را اندازه‌گیری کنند. تغییرات فشار مایع با تغییر سطح آن مستقیماً به تغییرات فشار دیافراگم منتقل می‌شود که به وسیله‌ی این Level Gauge ها تبدیل به خروجی الکتریکی می‌شود.

سطح‌سنج‌های رادار: این ابزارها از اصول رادار برای اندازه‌گیری سطح مایعات استفاده می‌کنند. امواج راداری از سطح مایع بازتاب می‌شوند و این بازتاب به تبدیل سیگنال الکتریکی می‌شود که سطح مایع را نمایش می‌دهد.

سطح‌سنج‌های اولتراسونیک: این نوع سطح سنج ها از امواج اولتراسونیک برای اندازه‌گیری سطح مایعات استفاده می‌کنند. امواج ارسالی به سطح مایع می‌رسند و بازتاب می‌شوند و زمان بازگشت امواج مورد استفاده قرار می‌گیرد تا سطح مایع را تعیین کند.

سطح‌سنج‌های هیدراستاتیکی: این ابزارها از اصول هیدراستاتیکی (فشار مایع به‌دلیل ارتفاع آن) برای اندازه‌گیری سطح مایع استفاده می‌کنند.

این سطح‌سنج‌ها برای نظارت دقیق بر میزان مایع در مخازن و تجهیزات مایعاتی بسیار حیاتی هستند. با توجه به نوع مایع، محیط، دما و شرایط کاری مختلف، انتخاب Level Gauge مناسب از اهمیت ویژه‌ای برخوردار است. همچنین، در این ابزارها باید مراقبت و نگهداری مناسب انجام شود تا دقت و کارایی آنها حفظ شود.

Level transmitter یا انتقال‌دهنده سطح، یک نوع سنسور اندازه‌گیری است که برای اندازه‌گیری سطح مایعات (مثل آب، نفت، گاز و…) در مخازن، مخازن ذخیره‌سازی، و محیط‌های صنعتی دیگر استفاده می‌شود. این دستگاه‌ها اطلاعات سطح مایع را به سیگنال‌های الکتریکی تبدیل کرده و به تجهیزات کنترلی و نمایشگرها منتقل می‌کنند تا بتوانند سطح مایع را به طور دقیق نمایش دهند و از آن اطلاعات برای کنترل و نظارت استفاده کنند.

به‌طور کلی، یک Level transmitter شامل سه قسمت اصلی است:

Sensor (سنسور): سنسور جهت اندازه‌گیری سطح مایع کاربرد دارد و معمولاً به‌صورت یک استوانه می‌باشد که از ماده‌ها و تکنولوژی‌های مختلفی (مانند فشار دیافراگم، اولتراسونیک، رادار، هیدراستاتیک و …) ساخته می‌شود. این سنسورها بسته به نوع مایع و شرایط کاری مختلف قابلیت‌های متفاوتی دارند.

Transmitter (انتقال‌دهنده): این قسمت اطلاعات اندازه‌گیری شده توسط سنسور را به سیگنال الکتریکی تبدیل می‌کند. در اصطلاح‌های فنی، انتقال‌دهنده‌ها می‌توانند سیگنال‌های آنالوگ (مانند 4-20 میلی آمپر) یا دیجیتال (مانند HART، Foundation Fieldbus، یا Modbus) تولید کنند.

Display/Controller (نمایشگر/کنترل‌کننده): این قسمت مسئول دریافت سیگنال‌های الکتریکی از انتقال‌دهنده و نمایش سطح مایع را به‌صورت عددی یا نمودار بر روی نمایشگرهاست. همچنین، این اطلاعات می‌توانند به کنترل‌کننده‌ها منتقل شوند تا کارایی پروسه و نظارت بر سطح مایعات را افزایش دهند.

از طریق این سیستم‌ها، می‌توان به طور دقیق و اتوماتیک اطلاعات سطح مایع در مخازن و وسایل دیگر را اندازه‌گیری و به‌کار برد. این ابزارها در صنایع نفت و گاز، پتروشیمی، آب و فاضلاب، نیروگاه‌ها، صنایع شیمیایی و دیگر کاربردهای صنعتی مورد استفاده قرار می‌گیرند.

  • Level Transmitter, KROHNE, BW25

    The Krohne BW 25 Liquid Level Indicator operates on the displacement principle. The length of the displacement rod corresponds to the measuring range. A displacement body suspended on a measuring spring is immersed in the liquid and is subjected to an upthrust based on Archimedes’ principle, this being proportional to the mass of the liquid displaced. Every change in the weight of the rod corresponds to a certain change in the length of the spring, and is therefore an indication of the liquid level. Extension of the spring is transmitted by magnetic coupling from the measuring zone to an indicator. This transmission method permits pressure-tight separation of the measuring spring system and the scale.

    BW 25

    • Displacer level transmitter for heavy-duty level and interface applications Continuous measurement of level, liquid-liquid interface or density at extreme process conditions Measuring range: 0.3…5/ 1…18 ft
    • Density: ≥45 kg/l/ ≥28.1 lb/ft3
    • -40…+400°C/ +752°F;
    • -1…400 barg / -14.5…10000 psig
    • Datasheet

    Level Transmitter, KROHNE, BW25

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  • Magtech™ Magnetic Level Indicator

    The Magtech Magnetic Level Indicator is a low-maintenance alternative to sight glasses and other level indicators. It provides non-invasive level indication while reducing leak points and fugitive emissions. The indicator gives you an easy to see level indication that is visible up to 100 ft (30 m) away. It is ideal for your high-temperature, high-pressure and corrosive applications were you want visual indication of both level and interface. Combined with Emerson’s externally mounted level transmitters and switches the Magtech Magnetic Level Indicator provides you with a complete, redundant and cost-effective level solution.

    • Specifications
    • Viscosity
    • Up to 2000 cP
    • Operating Pressure
    • Up to 4000 psi (275.9 bar)
    • Operating Pressure
    • Measurement Range
    • Features
    • Minimal leak points as compared to sight glasses
    • No process liquid in contact with indicator glass
    • Designed for both gas/liquid and liquid/liquid interface measurements
    • Measure both interface and top level with one indicator
    • Datasheet

    Magtech™ Magnetic Level Indicator

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  • Radar measurement Time-of-Flight Micropilot FMR52

    For applications in aggressive liquids Micropilot FMR52 offers extraordinary advantages with its completely PTFE-filled and flush-mounted horn antenna. The FMR52 is also the sensor for hygiene-sensitive applications in the food and life sciences industry – ASME BPE, USP Class VI, 3-A and EHEDG approvals. Micropilot is used for continuous, non-contact level measurement of liquids, pastes and slurries. The measurement is not affected by changing media, temperature changes, gas blankets or vapors.

    • Hardware and software developed according to IEC 61508 up to SIL3 (in homogeneous redundancy)
    • Reliable non-contact measurement even for changing product and process conditions
    • HistoROM data management concept for fast and easy commissioning, maintenance and diagnostics
    • Highest reliability even in the presence of obstructions in the vessel due to new Multi-Echo Tracking evaluation
    • Heartbeat Technology for a cost-effective and safe plant operation during the entire life cycle
    • Seamless integration into control or asset management systems and intuitive, menu-guided operation concept (on-site or via the control system)
    • World’s easiest proof test concept for SIL and WHG saves time and cost
    • Datasheet

    Radar measurement Time-of-Flight Micropilot FMR52

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  • Compact ultrasonic level transmitter, LST300

    LST300 represents the future of level measurement. While using intelligent compact transmitters has always been attractive, certain limitations prevented their use in many applications. LST300 removes those old obstacles. Whether you have the risk of flooding or corrosive materials in the process, LST300 survive these conditions easily. With metal at the top and PVDF at the bottom, LST300 is the first compact ultrasonic to be resistant to corrosion on the entire instrument. Ingress protection approvals up to IP68 (optional) ensure the entire device can survive flooding.LST300 combines the most advanced functions found on any ultrasonic in any class, in a compact form. Installation becomes easy thanks to the graphic echo display and advanced diagnostics. The false echo filtering algorithm combined with the best‑in‑class beam angle ensures easy installation in narrow areas with many obstructions. With through the glass technology, you never have to open the cover to configure the instrument. It is hard to believe that all this functionality is available on a device powered by only two‑wire loop power.FEATURES: 

    • Maintenance free, non-contact continuous level sensor
    • 2-wire instrument with HART digital communication
    • Up to 10 m measurement range
    • Wide temperature range of -40 to 85 ˚C
    • Accuracy of ±2 mm or 0.2 % of full span (the larger one)
    • Beam angle as low as 5˚ with false echo filtering for narrow spaces
    • Easy installation with graphic echo display, advanced diagnostic and easy setup menu
    • Unique GAP technology ensures the best performance under any condition
    • IP66/67 and NEMA 4X (can submerge to 1 m depth for 30 minutes)
    • ATEX, IEC & FM Intrinsic safe and non-sparking approved
    • Datasheet

    Compact ultrasonic level transmitter, LST300

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  • Guided Level-Radar, Levelflex FMP51

    Levelflex FMP51 for level measurement even under extreme process conditions like high temperature and high pressure in the process industry. FMP51 offers maximum reliability even in case of moved surface and foam or when numerous tank baffles interfere with the measurement. Levelflex FMP51 is used for continuous level measurement of liquids, pastes and slurries but also for interface measurement. The measurement is not affected by changing media, temperature changes, gas blankets or vapors.

    • Reliable measurement even for changing product and process conditions
    • HistoROM data management concept for fast and easy commissioning, maintenance and diagnostics
    • Highest reliability due to new Multi-Echo Tracking evaluation
    • Hardware and software developed according to IEC 61508 up to SIL3
    • Heartbeat Technology for a cost-effective and safe plant operation during the entire life cycle
    • Seamless integration into control or asset management systems and intuitive, menu-guided operation concept (on-site or via the control system)
    • World’s easiest proof test for SIL and WHG saves time and costs
    • Datasheet

    Guided Level-Radar, Levelflex FMP51

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  • R-SERIES REFLEX LEVEL GAUGE, RBB.28.NY.A.LL

    OROBICHE Reflex indicators display the fluid level through a transparent surface being part of a column that is connected to the vessel by on-off cock gauges. The measuring part is composed of one or more elements from prismatic borosilicate glass (crystal) which trigger the reflection or non-reflection of the environmental light depending on whether the inner surface comes or does not come into contact with the fluid or with the gas (vapour). The crystal is tightened to the inside of a steel box by means of bolts.

    Its sturdy construction and its good visibility, without using dedicated illuminators, make it ideal for use in heavy-duty applications with pressure up to 400 bars and temperature of the media from -196 °C up to +427 °C. APPLICATIONS AND TECHNICAL DATA Tube level indicators are used in various industrial processes, especially in the chemical, petrochemical, power production, metal and steel, water treatment, food, paper industries and the like. They are typically preferred to transparency indicators in application on clear and non-corrosive fluids. Versions with body and wetted parts in galvanized Carbon Steel are available, whereas AISI 316, ASTM LF2, Hastelloy and other materials are available upon request.

    OPTIONS

    • Safety ball check in AISI 316 (in the event of the crystal getting broken, it avoids fluid losses)
    • Graduated scale
    • Uninterrupted visibility
    • Drain and vent valves
    • Top / Bottom connections
    • No-Frost device
    • Electric or steam tracer
    • Aluminosilicate glasses
    • Screws and cock levers in AISI 316, for off-shore use
    • Datasheet

    R-SERIES REFLEX LEVEL GAUGE, RBB.28.NY.A.LL

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  • SITRANS LR250 Radar Level transmitters

    SITRANS LR250 is your first choice for liquid level measurement in storage and process vessels up to 20 meters (66 ft). With its range of antennas, this transmitter can handle whatever you need it to. Its new flanged and hygienic encapsulated antennas mean corrosive or aggressive materials and hygienic or sanitary requirements are no challenge for this transmitter.

    SITRANS LR250 Horn antenna
    SITRANS LR250 is a 2-wire, 25 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in storage and process vessels including high temperature and pressure, to a range of 20 m (66 ft).

    SITRANS LR250 PVDF antenna
    SITRANS LR250 with threaded PVDF antenna is a 2-wire, 25 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in storage and process vessels including corrosives or aggresive materials, to a range of 10 m (32.8 ft).

    SITRANS LR250 Flanged encapsulated antenna
    SITRANS LR250 with flanged encapsulated antenna is a 2-wire, 25 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in storage and process vessels including corrosives or aggressive materials, to a range of 20 m (66 ft) (antenna dependent).

    SITRANS LR250 Hygienic Encapsulated Antenna
    SITRANS LR250 hygienic encapsulated antenna is a 2 wire 25 GHz pulse radar level transmitter with sanitary and hygienic approvals for continuous monitoring of liquids, slurries and pastes within the Food, Beverage, chemical and pharmaceutical industries to a range of 20 m (66 ft) – antenna dependent.

    SITRANS LR250 Radar Level transmitters

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  • SITRANS Probe LR Level Transmitter

    SITRANS Probe LR is a 2-wire, 6 GHz pulse radar level transmitter for continuous monitoring of liquids and slurries in storage vessels with nominal pressure and temperature, to a range of 20 m (66 ft).

    The Probe LR is ideal for applications with chemical vapours, temperature gradients, vacuum or pressure, such as tank farms, chemical storage, digesters and long-range applications. SITRANS Probe LR has a range of 0.3 to 20 m (1 to 65 ft).

    Probe LR is designed for safe and simple programming using the Intrinsically Safe handheld programmer without having to open the instrument’s lid. It has a standard Uni-Construction polypropylene rod antenna that offers excellent chemical resistance and is hermetically sealed. The Uni-Construction antenna includes an internal, integrated shield that eliminates vessel nozzle interference. SITRANS Probe LR incorporates Process Intelligence ® signal processing. The Probe LR also has a high signal- to-noise ratio leading to improved reliability.

    Benefits

    • Uni-Construction polypropylene rod antenna standard
    • Easy installation and simple startup
    • Programming using infrared intrinsically safe handheld programmer, SIMATIC PDM or HART® handheld communicator
    • Communication using HART®
    • Process Intelligence signal processing
    • Auto False-Echo Suppression of false echoes
    • DATASHEET

    SITRANS Probe LR Level Transmitter

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  • Rosemount Apex and Apex Sentry Radar Gauges

    The APEX and APEX Sentry Radar Gauges use a radar signal to measure the level of liquid in a vessel. Because the radar gauge is mounted on top of a vessel and its components do not contact the product, it is a dependable alternative to a standard insertion device that can become broken or corroded when inserted into the process. The APEX Radar Gauge also works well in turbulent, aerated, solids-laden, viscous, or corrosive liquids, and thick pastes or slurries.

    Rosemount Apex and Apex Sentry Radar Gauges

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  • Micropilot M FMR240

    Micropilot M FMR240

    • Measuring principle: Level radar
    • Characteristic / Application: Ideal for level measurements especially in small tanks
    • Supply / Communication: 2-wire (HART / PROFIBUS PA / FOUNDATION Fieldbus)
    • Frequency: K-band (~ 26 GHz)
    • Accuracy: +/- 3 mm
    • Ambient temperature: -40 °C…+80 °C / (-40 °F…+176 °F)
    • Process temperature: -40 °C … 150 °C/ (-40 °F … 302 °F)
    • Process pressure absolute / max. overpressure limit: Vacuum…40 bar/ (Vacuum…580 psi)
    • Main wetted parts: 316L, Alloy C
    • Process connection: Thread: NPT 1 1/2, R 1 1/2, Flange: DN50…DN150, ASME 2″…6″, JIS 10K
    • Process connection hygienic: Tri-Clamp ISO2852
    • Datasheet
    • 4″, #150

    Micropilot M FMR240

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  • VEGA PULS53 Radear Level Transmitter

    Signal processing ECHOFOX® for echo analysis with Fuzzy-Logic. Adjustment via VEGACONNECT and/or PC, detachable adjustment module or HART® version via HART® handheld on 4 … 20 mA.

    Signal output:

    – Two-wire loop-powered compact sensor, also for use in Ex area, for connection to a power supply unit.

    – Four-wire compact sensor with separate power supply and current output, also for use in Ex area.

    – Sensor with digital signal transmission for connection to Profibus PA, also for use in Ex area.

    Housing of Plastic PBT or Aluminum (powder-coated)

    Process connection: flange with PTFE Coating

    Antenna system: rod antenna PTFE

    Process temperature: -40°C … +150°C

    Vessel pressure: max. 16 bar

    Measuring range: 20 m

    Protection: IP 66/IP 67

    VEGA PULS53 Radear Level Transmitter

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