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Level sensors are used to detect the level of liquids. In contrast to mechanical limit switches the switch points can be freely selected within the measuring range. One level sensor can replace up to four binary switches. Another advantage is direct level indication on the display. Adjustment to the medium is done automatically. The sensor is suitable for many liquid media.
> Reliable function even in coolant applications
> No time-intensive cleaning of mechanical components
> One sensor for all media – no adjustment necessary
> Selectable switch points for applications as required
> Direct level indication by LED display
> Modular concept saves time and money
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Soba VR ECO
Perfect for a use as a high level "security alarm" and/or for a multilevel regulation with several pumps in waste water, sewage water, polluted water, clean water, etc.
This model also exists in a smaller size for pumping stations with limited space.
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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 switch units arehoused tightly in stainless steel or engineeringplastic stem, and the permanent magnet 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 box (housing) to economize the external wiring construction.
FC(D) type magnetic float level switches are more economical in budget than other level switches 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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Closed : float at the top - Open : float at the bottom
Closed : float at the bottom - Open : float at the top
PRODUCT REFERENCE
PTF01070
PTFA2015
PTFA3015
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Magnetostrictive level sensors take advantage of the magnetostrictive technology for measuring product level, interface and temperature variations using to the float principle.
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EG series Magnetostrictive Level Transmitter was created from the principle of magnetic field strength of two different directions thus sending out a signal to determine the exact level of the medium. Therefore even if there should be a power failure and reconnection is needed, it will not affect the previous setting so there is no reconfiguration involved. Moreover there is no contact of the sensing element which is internally in the stem itself, so even if during repeat operation, there will be no damage done to the sensing element that might caused due to wear and tear.
As Magnetostrictive Level Transmitter signal output was direct, therefore additional installation of output interface was not needed thus any transfer interface. As the resolution was very accurate and reliable, this will enable to reduce the malfunction of the product and cause production down time of the company. Moreover, due to the durability of the sensing element, lifespan is exceptionally long, minimal maintenance and correction is needed, thus stocking up on replacement parts for maintenance is not needed.
For PC connection to enable distant monitoring of one EG transmitter ( use RS232 / RS485 communication port) or multiple EG transmitters (use RS485).
(RS 232 / RS485 are optional accessories).
Features
High performance.
Absolute position output.
Short response time.
High stable & high reliable.
Non contact & long operation life span.
Multi output selection.
Easy installation & no periodic maintenance.
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Continuous tank contents indication in tanks containing light heating
oil EL, diesel and other low viscosity liquids which do not attack the materials of the gauge.
For tank heights from 900 to 2,000 mm. An additional electronic remote indicator simplifies the taking of readings in installations where tanks are not easily accessible.
Suitable for remote indication up to 10 m.
Functions
Direct indication in % liquid level.
Remote indication (push-to-read)
Selection of units of indication and
total volume calculation.
Measuring range
0-900 to 0-2,000 mm.
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The wider displacement L500 multi-level switch for larger tanks monitors up to eight independent levels in a single device. Available in lengths up to 15 feet, these sensors are individually designed for your application from over 1400 possible combinations of floats, mounts, and material options.
With only a single entry, the L500 can track changing levels within the tank as well as monitoring liquid interfaces of dissimilar liquids in a single tank like oil water separations, chemical emulsions or condensation levels. These sensors can also be equipped with a wide variety of enclosures and thermostatic switches to provide level and temperature control in a single control.
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SD Optical Level Switch
NPN, PNP open collector output to energize relay or PLC
Outer material of PC, Polysulfone,
SUS304/316 for acidity and alkaline; applicable in grease, waste water, liquid solution, liquor, alcohol....etc
Over-current and reverse polarity protection
LED status indication
Application: liquid leakage detection motor/pump protection
The infrared sensor can precisely detects the liquid level, and the internal filter circuit can prevents error switching contact caused by the interference of ambient light and sunlight. The NPN or PNP open collelctor can drives laod up to 100mA max.
Features: It's small size, easy installation and suitable for application in liquid with mixed materials or slurries. The encloosure is made in PC that can resist oil and acid/corrosion. Several switches can be used at the smae time won't be interrrupted by each other. It can be hooked up relay and PCL for application.
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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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Example:
-JUMO dTRANS p33 Pressure transmitter and level probe for use in hazardous areas (40.4753)
The type 404753 pressure transmitter measures the pressure in both corrosive and noncorrosive gases, vapors, liquids and dusts. The transmitter operates on the piezoresistive measuring principle. The output signal is a DC current that is proportional to the input pressure.
The type 404753 pressure transmitter fulfills the following requirements for equipment group II
in Zone 1 and 2 areas with an explosion hazard arising from gas (Gas).
The pressure connection (process connection) may, however, also be mounted on to zone 0.
in Zone 21 and 22 areas with an explosion hazard arising from dust (Dust)
The EC type-examination certificate is designated: SNCH 03 ATEX 3545.
The pressure transmitter can also be used as a level probe (extra code /406).
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A range from 0.05 to 250 m water
These sensors are used to measure liquid levels for applications such as:
- filling tanks
- check of water table levels
Our sensors can be equipped with configurable recording systems. Their very low power consumption design enables several years autonomy.
Their internal memory allowe to record 500 000 values.
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Extremely short microwave impulses with low emitted power in the C-band and K-band frequency range are emitted by the antenna system to the measured product, reflected by the product surface and received again by the antenna system. They spread with light velocity and the time from the emission to receipt of the signals is proportional to the level in the vessel. A special time spreading procedure enables a reliable and precise measurement of extremely short time periods.
By simply entering the vessel dimensions, a level-proportional signal can be displayed. An adjustment with emptied and filled vessel is no longer necessary!
The spreading of microwaves is virtually not affected by the ambient temperature and ambient pressure. Radar sensors are ideal for use under arduous process conditions. Pressures from vacuum to 160 bar and temperatures between -40 and 400°C are no problem for a radar level measurement.
Fluctuating product compositions or complete changes of the product do not influence the measurement result. A new adjustment is not necessary.
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For measuring ranges up to 70 m, VEGA now has an optimised radar technology in its program. Due to its increased receiver sensitivity (factor 40), VEGAPULS 68 delivers reliable measured values in spite of higher signal damping in solids.
Non-contacting radar measurement delivers reliable levels in dusty environments, like in storage facilities for building materials. Also in the food processing industry, in steel production as well as for level measurement of powders and granulates in the chemical industry, the extended measuring range has proven to be extremely effective. Adjustable fl anges allow the eduction of false refl ections and the optimisation of the useful echo.
All advantages in an overview
- non-contact measurement
- unaffected by dust generation
- not infl uenced by fi lling noise
- high dynamic range of the sensor
- measuring range up to 70 m
- antenna cleaning by cooling air
- dust-Ex approval
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Radar measurement technology is non-contacting and low maintenance. Because microwaves require no carrier medium, they are virtually unaffected by the process atmosphere (vapour, pressure, dust or temperature extremes). Siemens Milltronics offers a choice of models to meet the specific needs of your application.
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With LB440-RID, the problem of weld inspections is considerably reduced. You have full and accurate information on your process - continuously!
LB440-RID is already being successfully operated in many plants world-wide.
All continuous level measurements employing rod detectors or the SuperSens point detector can be equipped with the patented Radiation Interference Discrimination LB440-RID.
The system works only with Co-60 sources - the energy of the Cs-137 radiation (660 keV) is too close to the energy of sources commonly used in weld inspections to be reliably discriminated.
Existing Berthold Technologies equipment can be easily upgraded to include the RID technology.
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These are used for the maximum and minimum level in silos
and mill hopper which contain powder or grain material
which can be cereals, plastic material, sand etc.
In the “RL-A” series the paddle turns at low speed which
when in contact with material stops turning causing a contact
to switch.
In the “SM 85” series the functioning is caused by material
pressing on a rubber membrane which causes a micro switch
positioned internally to operate.
- “RL-A” series with body and paddle in plastic material,
shaft and rope extensions in stainless steel ,
- Supply voltage: 24Vdc o 24/ 48Vac o 110/220Vac.
- Extensions lengths for “RL-A “ series available :
Shaft : 500 / 1000 mm
Rope : 2000 mm
- SM-85 series with aluminium alloy casting flange, plastic
body and neoprene membrane
- Electrical contacts:
2A a 250 Vac for “RL-A” series .
6A a 250 Vca for “SM-85” series .
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The Barksdale Tank Level Indicating Systems are sensors for remote indication level of liquid media. They operate according to the float principle with magnetic trans-mission (Permanent magnet, Reed switch and resistor chain). The liquid level is indicated on indicating instruments connected to the sensor.
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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, rugged 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 sensors. 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, electronic pressure controllers 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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Ultrasound level sensor SIMATIC PXS
Recording of fill levels from a distance of 3 cm to 10 m
Our sonar proximity switches sense objects of varying materials, shapes, colors or consistencies with absolute precision, flexibility and reliability.
The ultrasound level sensor is proper for level applications in containers due to its design and its technical constructions. The devices feature two switching outputs to which different distances can be assigned. This allows, for example, the minimum and maximum fill level in a tank to be evaluated. Regardless whether the objects are liquid, solid, powdery or even transparent.
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Short ultrasonic pulses between 10 kHz and 70 kHz are emitted by the transducer. These pulses are reflected by the product surface and received again by the transducer. They spread with sound velocity and the time from emission to receipt of the signals is proportional to the level in the vessel.
Latest microprocessor technology and proven ECHOFOX® software select the level echo from a number of false reflections and measure it exactly.
Just by entering the vessel dimensions, a level-proportional signal can be displayed. An adjustment with emptied and filled vessel is no longer necessary!
Thanks to different emitting frequencies, levels can be detected in a measuring range between 4 m and 70 m. Optional swivelling holders enable an ideal positioning of the sensors in the solid area.
Fluctuations of the product compositions or complete product changes do not influence the measurement results. A new adjustment is not necessary.
Advantages
- Non-contact
- Independent of product characteristics
Applications
- Level measurement of solids and liquids
- Good chemical resistance
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Siemens ultrasonic level measurement products are the cost-effective choice for monitoring and control in short- to long-range applications for liquids, slurries, and solids in a wide range of industries. Non-contacting technology offers low maintenance advantages. Siemens is the world leader in ultrasonic level measurement technology, with many models available and strong application experience to support you.
Ultrasonic Transmitters
Ultrasonic Transmitters provide easy-to-use continuous measurement. These transmitters offer superior reliability for level, volume, and flow applications in the water and wastewater, food, and chemical industries.
Controllers
Extensive product range from simple single-channel controllers to versatile systems for the monitoring of ten measuring points.
Transducers
Wide range of transducers with various measuring ranges, applications, and process connections
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Principle
The vibrating probe level switch 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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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 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 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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