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28.02.2008 Vouvry (Switzerland): A lot of process governor applications need to react to level detection. In order to offer an easy way to trigger a signal as an input for a PLC MANUFACTURERS or even switch power directly once a certain liquid level is reached, Microprecision electronics added a floater industrial actuator to its successful V3 size MP300 switch series.
A floating polypropylene ball of 50 mm diameter is mounted on a stainless steel lever actuator. Designed for a working temperature of 100°C, short term up to 120°C, this solution also shows a good chemical resistance.
The floater activates a MP320 switch wired as a change over or just simply NO or NC. The switch itself is IP67 sealed and has a power rating of 250 VAC / 6A under EN61058, with an operating temperature range which can go up to 200°C. The switch can be equipped with PUR, SI or PVC cable of any length.
Microprecision Electronics SA is a Swiss manufacturer of standard and custom made mechanical switches for industrial applications.
For further information contact: info@microprecision.ch |
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In order to eliminate false alarm given due to medium with high viscosity sticking onto the probe , a special material acting as an insulation industrial electrode have been added in between the active section and the grounding section.
As shown in the diagram, sensing probe always experience medium clogging on it and thereby produces a capacitance and resistance between the 3 parts. Since the electric field between the active section and the guard section is round shaped, there will be no current passing through the medium between the electrodes.
The Admittance level switch manufacturer uses this principle, to add a guard section between the active section and the grounding section to block the admittance current to reach the vessel wall from the medium between the active section and grounded electrode. Although there would be a small amount of admittance current between the guard section and the active section, the circuit would not take this current value into account. Due to the guard section, only the admittance current change between the active section and the tank wall will be detected by the circuit, thus only when the sensing probe is in contact with the medium will there be a precise signal.
Features
Not affected by material coating on the sensing probe.
Easy installation.
Stable operation, not affected by temperature.
Time delay function of 0~90secs.
Housing protection: IP65.
DPDT /5A output.
Maximum temperature: 550°C.
High / Low fail safe selectable features.
Applicable in liquid, syrup, solid, grain and interface detection. |
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The SC700 series are capacitance point level switches ideal for detection or control of liquids, solids, heavy pastes or slurries. Unlike other capacitance probes, the SC700 works for any type of conductive, non-conductive or low dielectric materials with extremely accurate performance, almost complete immunity from build up, temperature changes or condensation. The rigid rod is made with a strong and durable plastic (polyacethal delrin) for standard units or upon request the rod can be made with PTFE.
Features
*Simple to install & low in cost
*No moving parts-maintenance free reliability
*AC, DC or a Universal power supply specification version
*Extended versions available with rigid rod or cable
*Operating temperatures 14 to 200ºF (-10 to 95ºC)
*Maximum pressure of 725PSI (50 bar) up to 8000PSI upon request.
*Sensitivity as well as Time Delay adjustments
*Does not require an external reference in plastic or concrete vessels
*Available in threaded, sanitary and flanged process connections
*3A approved |
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Sitron´s line of Conductive Level switches suppliers offer a wide range of customized options to meet any application's need. CL models are designed to control the level of all conductive liquid mediums with up multiple points of level detection. Models are available with Fixed rigid rods, Removable rigid rods, or with Pendular electrodes attached to the housing with cables. Applications involve both alarm point level detection as well as on/off pump valve control. Like all of Sitron's products, the series of Conductive Level Switches feature easy installation and maintenance free reliability.
Models:
Sitron has several types of conductive switches:
*The CLF has fixed rods and is available with up to five points (or more upon request) of level detection and control.
*The CLR has removable rods designed for easy handling and installation and is also available with up to five points (or more upon request) of level detection and control.
*The CLP has pendular electrodes designed for deep well or tank applications and is also available with up to five points (or more upon request) of level detection and control.
*The CLE is a single pendular industrial electrode without the enclosure or the process connection.
These models are all used along with a (BS16 or CN16D) external controller . |
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| Where fluids must be stored or handled the Barksdale level switches with their large variety from a simple com-pact switch to multi level stations with lengths up to three meters are a logic choice (longer on request). |
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| Due to specific tank layouts and the variety of media available in the pharmaceutical, chemical and automotive industry, a wide product range is required to ensure that all requirements can be met. A comprehensive modular system enables you to configure almost any level measurement solution possible. In exceptional cases where this is not possible, you can rely on the comprehensive development expertise of elobau. |
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Buy plastic float switches below $5.00!
Our FS01- is an economical choice for many general applications.
Polypropylene Float Switches offer an economical solution for general applications and are also good for many acids where chemical resistance is important.
Nylon Float Switches with Buna-N Float are ideal for petroleum oils and other fuel applications. This highly bouyant float switch is designed to be used in fluids with specific gravity of .5 or higher.
View the SMD "Application Notes" to check chemical compatability and specific gravity for your fluid. |
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BIP STOP VR ECO
By connecting it directly to the pump, this float level switch manufacturers makes start and stop the pump.
110° switching angle that prevents excessive jerking of the pump's engine.
Biconical cover which avoids any risk of clogging. |
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Sensortechnics is a leading manufacturer and distributor of a wide range of sensors and fluid control devices. The product portfolio includes basic pressure sensors manufacturers, rugged industrial transmitters, submersible level sensors and customised pressure sensing systems from 1 mbar up to 1000 bar as well as liquid level switches, oxygen, flow and force detection. Additionally, Sensortechnics offers ultrasonic air bubble, air-in-line, liquid level and fluid monitoring sensors and detectors. Fluid control devices include miniature solenoid valves and diaphragm pumps manufacturer, electronic pressure controls and custom specific fluidic control systems.
Sensortechnics has more than two decades of experience in providing highly customised sensing products and in the development of complex integrated fluid control systems for OEM customers worldwide. |
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ULS7 is the new industrial OEM level switch suppliers from Barksdale combining the advantages of the ultrasonic measuring with the well-known functions of electronic pressure gages.
It is ideal for level control. The ULS 7 is used in numerous applications like machine tools, hydraulic systems or testing beds
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| OPTISWITCHes are available in a number of variants: with short and long paddles, coated and uncoated, and made of various metals and alloys. The OPTISWITCH 5000 is designed for liquids; typical applications are overflow and dry-run protection. The OPTISWITCH 3000 supplements the KROHNE product range in this sector by switches for solid materials, mainly particulates with a bulk density upwards of 0.02g/cm3. |
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Convincing Advantages
- easy and reliable method to monitor fluid levels
- proven float principle
- easy side installation using threads ¾" or ½" BSP
- potential-free contact as signalling transmitter
SIKA-level controller in service as
- run dry protection for pumps (minimum alert)
- spill protection (maximum alert)
- leakage monitoring
- screwed-connection oil level monitoring gauge, e.g. at compressors |
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ATS 165 EP, ACS certified (ACS: Certificate of Sanitary Conformity)
ACS certified float level switch for a mandatory use in drinking water (EP) meant for human consumption.
This float level switch manufacturer is connected to the pump to perform an automatic regulation. It has been specially designed for use in very agitated liquids and its 165º switching differential avoids excessive jerking of the pump.
Application exemples: Tanks and reservoirs of drinking water.
For multilevel regulation in drinking water, we propose the SOBA EP, ACS certified which has a 25º switching differential. |
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Level switch applications are found in all types of production, including the food indutry, for monitoring one or more high/low levels on fluids or bulk material.
This is applicable on all kinds of vessels e.g.:
storage tanks manufacturers
hot product bunkers
stirrer vessels cyclones
sluices
feeder chutes etc.
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"The Nivotemp M series from Buehler comprises a group of controllers for the control of both liquid level and temperature in fluid power packs or lubrication systems.
The installation via a central thread is cost effective and allows the use of a small float with good boyancy.
Despite small physical dimensions the Nivotemp M has a series of adjustable bistable contacts.The number of contacts is determined by the type of the connector suppliers as you can see from the data sheets.
The use of bistable contacts allows the float to operate a number of contacts.
liquid level and temperature in one unit
adjustable contacts
bistable = just one float
float with good buoyancy
electrical connector suppliers included
easy installation
maintenance free" |
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The horizontally mounted L070 is a rugged, hazardous duty level switch providing a safe, isolated switch closure for monitoring high and low liquid levels. With an all stainless steel construction and ultra-light float, the L070 provides high performance in most any media and can be adapted to sense dissimilar fluid interfaces within a 0.1 differential.
FM approved for Class I, Division 1, Groups C,D,E, F & G hazardous locations, the L070 also features a water-tight switch enclosure with a standard ½" NPT conduit connection and can be installed for either normally open or normally closed switching. |
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Soba Ex, ATEX certified
Compulsory for multilevel regulation in sewage pumping stations with explosive risks 0, 1, 2 (gas) & 20, 21, 22 (dust) |
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FCI liquid level/interface switches feature Thermal Dispersion technology in which the temperature difference between the two RTDs is greatest in the absence of liquid and decreases when the level element is submerged, cooling the heated RTD. An electronic control circuit converts the RTD temperature difference into a DC voltage signal. Both signals are provided at output terminals to drive two adjustable-setpoint alarm circuits. Both alarms are independently field configurable for liquid level, interface or temperature operation. Since all process media exhibit different heat transfer capabilities, highly sensitive FCI liquid level/interface controllers may be specifically calibrated to detect difficult interfaces between fluids -- including liquids, gases, slurries and foam regardless of their physical properties.
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The single unit or multiple reed switching units arehoused tightly in stainless steel or engineeringplastic stem, and the permanent magnetic issealed into the middle of the specified float ball(s). You can mount the float ball to penetrating through the stem, then the liquid buoyancy will deliver the float ball up and down at the specified position by graduating rings.
When the float internal magnet approaches the reed switch, it will actuate the reed switch contact point to create an open or close circuit. We can apply such on-off output signals to reach liquid level controlling and monitoring purpose.
The figures below show the float orientations on N.O. (Normal Open) and N.C. (Normal Close).
Features
Multiple points measuring, multiple level points are available for custom-built.
It is used the magnet to actuate the reed switch without any extra electric power source.
Each reed switch is durable for operation life reaching 2 million times.
All output signal wiring are simplified in same junction case (housing) to economize the external wiring construction.
FC(D) type magnetic float level switches are more economical in budget than other level switches suppliers by comparison in multiple points.
The housing protection rating up to IP65.
Rugged construction and multiple options for materials from engineering plastics as PVDF, PP, PVC, and stainless steels as SUS304, SUS316, float switches can be applied to versatile applications in chemical corrosion of acidity and alkalinity liquid, solvents or oil fuels.
The reed switch and lead wire are isolated absolutely with liquids. All stainless steel switches are applicable to high pressure andhigh temperature performances. |
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Soba HR HY
Recommended to perform multilevel regulation in highly corrosive liquid mixtures (hydrocarbons, oil, solvents, waste water, etc.). |
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Pointek CLS 100
Compact 2-wire inverse frequency shift capacitance switch for level detection in constricted spaces, interfaces, solids, liquids, slurries and foam.
Pointek CLS 200
A versatile inverse frequency shift capacitance level switch with optional rod/cable choices and configurable output, ideal for detection of liquids, solids, slurries, foam and interfaces.; digital version (with optional PROFIBUS PA) includes a display and provides additional diagnostic features.
Pointek CLS 300
Inverse frequency shift capacitance level switch with optional rod/cable choices and configurable output. It is ideal for detecting liquids, solids, slurries, foam and interfaces in demanding conditions where high pressure and temperatures are present; digital version (with optional PROFIBUS PA) includes a display and provides additional diagnostic features.
Pointek CLS 500
Inverse frequency shift capacitance level switch for detecting interfaces, solids, liquids, toxic and aggressive chemicals in critical conditions of high temperature and pressure; HART communications for remote commissioning.
Pointek ULS 200
Ultrasonic non-contacting switch with two switch points for level detection of bulk solids, liquids and slurries in a wide variety of industries.
SITRANS LPS200
Rotating switch that detects high, low and demand conditions for bulk solids.
SITRANS LVS200
vibrating point level switch with unique robust tine design, for use on bulk solids.
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Principle
The vibrating probe level switch manufacturer is structured of two piezoelectric elements built on vibration kit inside pipe. One receives pulse signal from PCB and causes pipe to vibrate, and the vibration transmits to the other in order to output electric signal and it is sent to PCB. When the vibration of the pipe is paused when measuring the material surrounding it, PCB can not receive the vibration signal from the piezoelectric element and relay actuates on.
This enables the use in fail-safe due to few malfunction and high stable work.
This vibrating probe provides reliable & trouble-free level sensing for bulk solids. Simple mounting and calibration, high confidence in working, it is unaffected by material built-up and static electricity, and can withstand high lateral loads.
Features
No calibration needed, using friendly as well as sturdy and durable design.
Shed off build-up material. No fear about accumulated material on sensor.
High / Low fail safe modes offer safety and reliability.
According to different density, its adjustable sensitivity wheel button can be set even for finest material. |
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The V-Tork is a point level switch that is designed to detect low or high level of liquids, thick and turbulent fluids, as well as corrosive mediums and pastes (depending on viscosity). Due to its simple and rugged controlled system, the V-Tork is virtually unaffected by any chemical or physical properties of the mediums and can be installed at any angle of the pipe or tank. It is ideal for multiple-purpose processing where the probes must be compatible with a variety of process materials and process conditions. The V-Tork does not require recalibration between batches and can also be cleaned in place.
The V-Tork can operate in temperatures up to 176ºF (80ºC) and has a maximum working pressure of 725 PSI (50Bar).
Standard probes are available with 3/4” up to 1” BSP or NPT process connection and insertion length L= 3 1/8” (L= 80mm).
FEATURES
*Unaffected by variations in density, conductivity, or dielectric constant.
*Unaffected by foam, tank agitation or vibration.
*Various length options to best suit your application.
*Made with 316 S.S. and can be PTFE coated.
*Relay and Transistor outputs available.
*Thread, Tri-Clamp, Hygienic Fittings, Flanges, etc.
*Polished Forks - RA tested when necessary
*3A approved |
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VEGASWING:
Versatile use in liquids
The piezo drive is the heart of VEGASWING, actuating the tuning fork on its resonance frequency. The frequency of the fork falls when being immersed. The frequency change is processed by the integrated oscillator and converted into a switching command. The piezo drive is screwed to ensure reliability and ruggedness. With the tuning fork of only 40 mm length, VEGASWING 60 works reliably in all liquids and mounting locations. Pressure, temperature, foam and bubbles and even viscosity do not affect the switching accuracy. Even pipelines with a nominal width of DN 25 are no problem.
VEGASWING 60 is the universal level switch for all applications.
Advantages
- Virtually independent of product characteristics
- Level detection up to +250°C
- Short tuning fork of 40 mm
Applications
- Level detection of liquids
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| The Pulsarpoint 200 series range of point level measuring systems offers the very latest state of the art technology applied to the well respected vibrating blade principle of operation. All units in the range are manufactured to the highest standard from 316 solid stainless steel for maximum strength durability and corrosion resistance. Series 200 provides highly reliable, fixed point level indication or control with a repeatability of 1mm or better. Versions are available to measure solids and slurries with relay output. The Pulsarpoint 200 series uniquely combines solid rugged construction with high sensitivity to produce maximum reliability. The unique blade design allows 'tip sensitive' control and the unit does not react to troublesome material build up on vessel walls. Standard units may be extended using fixed or flexible extensions to suit the application. |
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The vibrating rod of VEGAVIB is actuated via piezoceramic elements. If the vibrating rod is immersed, the amplitude will be damped. The amplitude change is processed by the integrated oscillator manufacturer and converted into a switching command. Due to the rod design, it is nearly impossible for material, e.g. granules, to get wedged in. Typical applications are overfill or dry run protection systems, e.g. in flour, milk powder, sand, cement, plastic granules, styrofoam and down feathers. Even products with a specific gravity up to 0.015 g/cm³ (15 g/l) can be measured. An adjustment with medium is not necessary as the mounting location and the granulation size do not affect the measurement.
Advantages
- Virtually independent of product characteristics
- Optimum rod configuration for solids
- Easy cleaning
Applications
- Level detection of solids
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