An electronic circuit continuously excites the tuning fork, causing it to mechanically vibrate. The tuning fork type level switches working principle based upon detecting the change in harmonic vibration frequency of the sensing element as a result of the presence of the target media. This frequency change is processed by the integrated electronics and converted into a switching command. When the fork comes into contact with a material, the fork will release some frequency signal as feedback. Proximity level switch, tuning fork 2hme2tflsw11sr1. The information contained in this document is believed to be correct, but. Minitype tuning fork level switch omega engineering. The tuning fork level switch can be widely applied to detect the min. The kobold liquid level switch nws is designed as a 2 and 3wire switch and can be universally used in vessels and pipelines. Ideal for almost all liquid applications wide choice of materials, process connections, and switching mechanisms configurable for your application electronic, selfchecking, and condition monitoring useradjustable mode selection and time. Operating instructions for level switch tuning fork principal. Vibronic liquiphant ftl50 point level detection endress. The heart of the sensor is the vibration drive by which the tuning fork is energized to vibrate at its resonance frequency. The ltu2000 series is based on the vibrating tuning fork principle, using piezoelectric crystals.
The first piezoelectric element triggered by pulse signal that created from circuit to transport vibration energy out, and the other piezoelectric element receives the vibration and transmits it to output electric signal. This allows for separation of the electronics and tuning fork for applications requiring a rigid extension. Pulse point ii series models sense when a material reaches or leaves a particular point. Pulse point ii series vibrating fork level sensor bindicator.
Operating instructions level switch 8110 tuning fork. A few applications include chemical processing, mining, food and beverage. Vibrating fork level switch working animation animation credits. Series tfls tuning fork level switch bulletin l33 specifications perfect for sensing low bulk density or low dielectric materials series tfls tuning fork level switch is ideal for level control of powders and fine grained solids, especially those with a low bulk density. It will be converted into the output of the contact signal. The finetek tuning fork level switch is suitable level control switch for liquids, sludges, petroleums as well solid level detection of almost. Standardtype tuning fork level switch ltur3022 ltur3022. It means that the tuning fork switch is voided and the relay is not conductive. Level switch compact tuning fork point level switch for liquids. Model ctf mini tuning fork level switch is an ideal choice. On the application of voltage, the crystals oscillate. Vibronic point level detection offers safe overfill prevention in liquids and bulk solids in every industry. Lu101405 flowline switchtek ultrasonic liquid level switch, any orientation mount, 2. A piezoelectric crystal is used for excitation of oscillations and for monitoring the actual oscillation frequency.
The ltu2000 series tuning fork sensors are point level switches that are designed to detect low or high levels of liquids. The resonance of the fork is caused by the piezoelectric crystal. When the fork comes in contact with a material, the vibration is dampened and the switch changes state. Changes to this frequency are continuously monitored. The turning fork is installed in the tank at a level which the level is to be sensed. It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone once the high overtones fade out. The tuning fork of level switch operated by using two piezoelectric elements builtin on vibration tube. The circuit detects this frequency change and indicates the presence of mass contacting the fork. Looking for proximity level switch, tuning fork 2hme2. The basis of point level detection with vibrating level switches is a tuning fork, i.
Lz121405 flowline switchtek vibration fork liquid level switch, any orientation mount, 2. Featured in the tfls is userselectable failsafe operation of the. Vibration fork point level switch instrumentation and. Level sensors 18006330405 for the latest prices, please check. When the material to be detected covers the fork, vibrations are damped. The vibrating fork type level switch working principle is simple and effective. Therefore, there is no signal amplification circuit inside, which can eliminate the trouble of frequent sensitivity adjustment due to the material change. Liquiphant ftl50 is a point level switch for use in hazardous areas with all international certificates. All models of the rosemount 2120 level switch level switch are covered in this manual. Soliphant m ftm50, ftm51, ftm52 vibronic universal point level switch for finegrained bulk solids application soliphant m is a robust point level switch for silos with finegrained or dusty bulk solids even with a low bulk weight. A piezoelectric crystal oscillates the forks at their natural frequency. It means that the tuning fork switch does not sense the material and the relay is conductive. Rosemount 2120 level switch march 2019 overview of the rosemount 2120 level switch measurement principle the rosemount 2120 is designed using the principle of a tuning fork. The model ctf mini tuning fork level switch is an ideal choice for level control of powders.
Rosemount 2120 level switch vibrating fork emerson. They are found in a wide variety of industries not limited to manufacturing, food and beverage, chemical and pharmaceutical, marine, medical, and fuelenergy management. This change in frequency causes the point level switch to switch. Tuning fork sensors stainless steel or etfe coated.
The rs85 vibrating switch utilizes a piezoelectric driven tuning fork. Tuning fork level switch principle instrumentationtools. When covered with medium, the frequency of the fork decreases. The electrically simulated vibration fork vibrated at a particular frequency.
The electronics system in the point level switch monitors the resonance frequency and indicates whether the tuning fork is vibrating in air or is covered by liquid. The ctf incorporates a piezoelectric crystal that vibrates the fork at its natural frequency. If the vibrating probe comes into contact with the medium, the oscillation rate changes and the vibrating level switch outputs a switching command. With the second line of defense the highest degree of safety and availability of the device can be guaranteed. Sc tuning fork level switch for liquids sales catalog. Vibrating fork level switches manual vrt smart type mvrtenv1. Measuring principle the sensors fork vibrates at its intrinsic frequency. A tuning fork is an acoustic resonator in the form of a twopronged fork with the prongs formed from a ushaped bar of elastic metal usually steel. Ftl50 is a point level switch for liquids used as overfill prevention or pump dryrun protector, also suitable for hazardous areas. Rosemount 2120 level switch vibrating fork emerson us. The resonator utilizes a piezoelectric driven tuning fork that exhibits a large change in resonant frequency when immersed in any liquid.
The sc series tuning fork level switch is suitable for detecting the presence and absence of liquids and solutions of a wide range of fluid materials. There is a piezo ceramic crystals located inside the fork assembly. Liquid level switches selection guide engineering360. Measuring system the measuring system consists of a liquiphant ftl31 point level switch, e. The rosemount 2120 level switch provides easy to install, reliable level detection and control. The vibration switch consists of an oscillating or tuning fork which is made to resonate in the air.
Selfdiagnosis mechanism that can detect fork abrasion or buildup. Manufacturer of level switch compact tuning fork point level switch for. Proof test from the switching unit without changing levels. Measured variable level limit value measuring range detection range ftl50.
Tuning fork level switch uses a metal tuning fork structure to detect the presence of a liquid or solid powder or granules in a vessel. The level switch is designed using the principle of a tuning fork. Level switches are sensors with an electrical contact output at a specific liquid, powder or bulk level. L the sitrans lvs200, pipe extension version, is a vibrating level switch that incorporates a customer supplied pipe extension maximum length 3800 mm 150 with the standard or liquidsolid short lvs200 fork and electronics. The vibrating fork type level sensor works on the principle of tuning forks. Liquid level switches can be used for high or low level sensing and alarms, leak detection, overfill shutoff, and regulating the interface between levels of different media. The second line of defense guarantees the highest degree of safety and availability of the switches. Technical information liquiphant m ftl50, ftl51, ftl50h. Bulk pro systems model tf tuning fork level switch is ideal for level control of powders and fine grained solids, especially those with low bulk densities. Modularity point level switch liquiphant m ftl with electronic versions fel51, fel52, fel54 l00ftl5xxxx1505xxxx000 point level switch. When the tuning fork is immersed in a liquid, its intrinsic frequency changes due to the change in density of the surrounding medium.
Mobrey squing 2 vibrating fork liquid level switch mobrey squing 2 capabilities include. The rosemount 2 level switch level switch uses vibrating short fork technology, and is suitable for virtually all liquid applications. The product relies on the damping effect by covering the testing material on the tuning fork which reduces the vibration frequency of the tuning fork and outputs a switch signal. Sc35 tuning fork level switch strong vibration for powders, granules and other types of materials. Vibrating level switches are used as overfill protection or empty alarm. A piezoelectric crystal oscillates the forks at their natural frequency 1400 hz.
The nws operates on the tuning fork principle in air at resonance frequency. Tuning fork vibrating level switch instruction manual page 3. Liquiphant stands for reliable switching unaffected by. Download pdf technical specifications download pdf. A stainless steel tuning fork is driven by piezo ceramic elements, causing it to vibrate at its resonant frequency. The pulse point ii vibrating fork level sensor is ultrahigh sensitive for materials with densities down to 0. Vibrating fork level switch working animation instrumentation. Series tfls level tuning fork level switch perfect for. Level sensors, level indicator, vibration switch, level. When the prongs of the fork contact anything with substantial mass, the resonant frequency of the fork decreases. Ltu2000 series tuning fork stainless steel or etfe coated. Vibrating fork level switch piezoelectric manufacturer.
Capacitive, conductive, diaphragm, displacer, float, inductive, optical, paddle, vibrating rod, tilt, and tuning fork models are the different types of level switches available. Mini tuning fork level switch is an ideal choice for level control of powders. The principle of operation is based on changes in vibration frequency of the tuning fork when it comes in contact with the target fluid. The various designs mean the device has a wide range of applications. A signal is output via the dcpnp or acdc electrical connection. Technical information liquiphant m ftl50, ftl51, ftl50h, ftl51h. The tf incorporates a piezoelectric crystal that vibrates the fork at its natural frequency. When the tuning fork is submerged in the product, the frequency changes. The rosemount 2120 is designed using the principle of a tuning fork. This frequency is reduced when covered with liquid. The more you rely on echotel ultrasonic level switches, the less you will worry if a tuning fork is up to the job of providing the outstanding quality, reliability and.