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Capacitive Proximity Switches SIMATIC PXC
Monitoring Fill Levels and More
Capacitive proximity switches also operate contactless and equally respond almost instinctively when conductive or non- conductive materials in solid, powdery or liquid states have to be measured. They are particularly convincing in monitoring fill levels through non-metallic materials such as plastic or glass, and in counting objects made of various substances.
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Capacitive proximity sensors react to metals and non-metals that exceed a specific capacitance on approaching the active surface.
The sensing distance with resprect to a specific material is greater the higher the dielectric constant.
The sensors are used to detect objects, for counting functions and for all types of level monitoring applications (liquids and solid materials.
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Capacitive proximity switches are designed for non-contact and wear-free detection of metal (electrically conductive) and non-metal (electrically non-conductive) objects.
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In all automated processes the use of sensors to provide information for the plc is of prime importance. Sensors supply the necessary signals on positions, end stops, levels or serve as pulse transmitters for counting jobs or for monitoring rotational speed. In industrial usage inductive and capacitive proximity switches are indispensable. As compared to mechanical switches they offer almost ideal conditions: non-contact, maintenance-free operation, high switching frequencies and switching accuracies as well as high protection against vibration, dust and humidity.
Inductive sensors detect all metals without contact, capacitive sensors detect nearly all solid and liquid media such as metal, glass, wood, plastic, water, oil, etc...
Both inductive and capacitive proximity switches are available in NAMUR versions. In conjunction with an NV0100/NV0200 amplifier the sensors can be used in zone 1 hazardous areas (the amplifier which contains Zener barriers as well as power supply and output must be mounted outside the hazardous area).
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The capacitive sensors with extreme long sensing distance are based on the three-electrode measuring-principle. this measuring principle allows much larger sensing distances compared to the two-electrode principle of common capacitive sensors, up to 10-times the norm. Although one achieves essentially larger switching distances with these capacitive systems, the size of the sensors is small.
KXS-Systems are used for applications where the sensing distances of standard sensors are not sufficient.
A further feature is the Duplex-or Triplex-operation. With the corresponding evaluation unit it is possible to adjust 1, 2 or 3 switching points with only one sensor.
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Capacitive sensors (KAS) react to metals and non-metals that exceed a specific capacitance on approaching the active surface. The sensing distance with respect to a specific material is greater the higher the dielectric constant. The sensors are used to detect objects, for counting functions and for all types of level monitoring applications in liquid materials (i.e. water, oil, acids, glue) and bulk materials (i.e. pouder, granulate, pellets).
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- Non-Contact Measurement for Distance / Motion / Vibration
- Absolute Position Sensing
- Sub-Nanometer Resolution
- Measurement Ranges to 500 µm
- Easy Integration
- High Bandwidth
The new PISeca™ single-electrode capacitive sensors from PI perform non-contact meas-urements of distance, position or motion against any kind of electrically conductive target. They feature the highest resolution and linearity available.
The PISeca™ single-electrode capacitive gauges are fundamentally very temperature stable, have excellent dynamics and are easy to work with.
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Capacitive sensor - 4B BINSWITCH
- Application: level indicators (tanks/silos); choke switches (chutes, conveyors, elevator legs)
- Detects presence or absence of most liquids & free flowing bulk granular materials
- Easy installation & self-contained
- Reliable & rugged, 30mm diameter body, fully encapsulated electronics
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Capacitive sensors evaluate the change in capacitance which occurs when an object enters the electrical field of a capacitor. When appropriately dimensioned, the capacitive sensor is also able to “see through” certain non-metallic materials. This ability makes it the classical level detector, sensing the level of liquids and granular products through container walls..
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Capacitive Sensors
Like inductive sensors, capacitive sensors function without physical contact with the target material. Capacitive sensors allow for the detection of both, conductive and non-conductive materials, but are most commonly used for sensing materials such as plastics, liquids, powders and granular materials.
In applications utilizing capacitive technology the sensitivity of capacitive proximity switches is dependent on the material characteristics of the target object. This material characteristic of the metal, plastic or liquid object will influence the sensing range and therefore the output detection point of the capacitive sensor. To allow for this variation in material characteristics Pepperl+Fuchs offers many models with adjustable sensitivity to allow for more flexibility in applying these sensors to your application.
These capacitive sensor products offer an alternative technology for use in applications where the use of inductive sensors may not be possible.
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Capacitive sensors
The non-contact capacitive sensor transforms a dimension important for production technology (distance or fill level) into a signal for further evaluation. It functions on the basis of the modification of the electrical field surrounding its active zone. The basic structure of the sensor consists of a RC oscillator as sensor, a demodulator and an amplifier. Metals or non-metals which come close to the active zone of the capacitive sensor cause a capacity change, so that the RC oscillator begins to oscillate. As a result, the trigger downstream from the oscillator switches and the signal amplifier alters its output status. Depending on the type of device, the switching function at the output can be N.C, N.O or a change-over contact.
Applications
The capacitive proximity switches are suitable for the control and monitoring of machine processes and as signal transmitters for counting tasks, which involve metals and non-metals; for signalling levels in containers and through container walls, where liquid, powdered or grained substances are to be detected.
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The E2K-C family offers the application versatility of capacitive style proximity sensing in the flexibility of a threaded cylindrical sensor to detect metallic and non-metallic objects. This family of sensors are ideal for non-contact sensing of metallic and non-metallic targets including water, oil, glass, plastic and wood, even detecting liquid levels inside non-metallic containers. These sensors have multi-turn adjusters allowing the user-adjustable settings of the detection distance. The E2K-C can even reliably detect foamy liquids in sight glass applications.
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These are electronic transducers which provide an output signal
when any type of material (Wood, metal plastic, granular and
powder product) comes into their sensing area without coming
into contact.
-Cylindrical series 18 - 30 - 40 mm dia.
-Totally screened and partially screened version
-Adjustable sensing distance
-Amplified 4 wire types NPN or PNP, NO+NC from
10 ÷ 55 Vdc
-Amplified 2 wire types from 20 ÷ 250 Vac/dc
-Relay output type with 1 pole changeover 1A ÷ 220 Vac
-Supply voltage 18 ÷ 50 Vdc / 18 ÷ 240 Vac
-Led incorporated
-Short circuit protection for D.C. and A.C. versions
-Maximum output current D.C. 200 mA, AC. 300 mA
-Types with connector output
-Types with instantaneous intervention or timing up to 15 min
-Protection housing in HOSTAFORM if used as level control
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Detector of position for the good and bad material detection conducting of electricity. adjustable the nominal range of the detector is let regulate by means of a potentiometer. The detectors high temperature the detectors resisting the high temperatures normally consist of a head of detection planned for the high temperatures and of a separate electronic module. They are connected together by a cable with Teflon sheath. Favour: detection until 200° turnover
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SENSOR PROBES
Capacitec non-contact displacement probes are noted for their large linear range versus the small outside diameter of the probe package.
INSTRUMENTATION
Capacitec's line of instrumentation includes electronic racks, amplifier cards, clock driver cards and accessories. Please contact Capacitec to configure the optimal combination of probes and instrumentation to best meet the needs of your particular application.
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The SC200 capacitive point level switch is an excellent solution for applications with space limitations. It senses virtually any type of medium and also performs well when coating or product build-up becomes a concern. The unit features an LED for switch point status as well as a potentiometer to adjust the sensitivity of the unit.
SPECIFICATIONS
SC200
Operating Voltage: 12...30Vdc
Current Consumption: 3mA
Adjustment Potentiometer switch point
Output: PNP (3 wire)
Operating Temperature: 14 to 176ºF
RL202: Controller for AC Power Supply
Operating Voltage: 115 or 230Vac (50/60Hz)
Output: 1 SPDT (5A - 250Vac)
Operating Temperature: 14 to 140ºF
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capacitive sensors
- starting at size M12
- plug or cable connection
- normally open, normally closed output
- stainless steel, brass-, plastic housings
- short circuit protection/reverse battery protection/overload protection
- special designs on request
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Features:
- Available in flush mountable body style
- Nickel plated housing with IP67 and IP69 protection rating
- Sensing distance of 2 mm (0.078” to 15 mm (0.591”)
Capacitive proximity sensors are ideal for sensing non-metal objects or for level control of fluids and granular material.
Adjustment can be used to zero out the presence of an object allowing the sensor to sense "through" a bulk material or liquid level.
The operating distance of a capacitive sensor is related to the dielectric constant (εr) of the object material to be detected. The higher the value of εr, the easier the detection of the object will be. The object to be detected through must have a lower εr value.
The threshold level is adjustable via a 20-turn potentiometer located at the rear of the sensor
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Warner Electric has many years of experience in applying sensors and switches in motion control applications. Our broad range of innovative and technologically advanced products offers our customers the exact solution to satisfy their sensing applications needs.
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general data mounting type shielded
nominal sensing distance Sn 4 mm
nominal sensing distance Sn adjustable 0,5 ... 4 mm
temperature drift ± 15% (+10 ... +70 °C)
sensitivity adjustment Pot, 270°
output indicator LED yellow
electrical data voltage supply range +Vs 10 ... 30 VDC
current consumption max. 20 mA
output current < 200 mA
voltage drop Vd < 1,5 VDC
switching frequency < 50 Hz
short circuit protection yes
reverse polarity protection yes
mechanical data type cylindrical
housing material PBT
dimension 12 mm
housing length 60 mm
connection types cable
ambient conditions operating temperature -25 ... +75 °C
protection class IP 65
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Level and feed monitoring - that is one of the attributes of capacitive sensors. Irrespective of whether it involves a solid material such as paper or wood, granules or liquids. They reliably detect the status of the product in the production process and during final inspection.
Capacitive sensors supplied by SICK are always convenient to use. Sensing ranges between 1 and 25 mm allow clearance in almost any installation situation and they are extremely adaptable for a wide range of applications.
Thereby these sensors are suitable for extremely adverse industrial environments. Impurities and contamination, dust and airborne spray particles have little effect upon them as does electro-magnetic interference. No wonder that they are installed in the most diverse branches of industry. In the food industry, car industry or in storage and conveying technology.
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GAPMAN®
Portable Electronic Feeler Gage
GAPMAN is the world's first high precision, non-contact, portable electronic gap measurement gage. It features a dual capacitive sensor for position-compensated measurement and easy insertion into very narrow gaps down to 0.009" (0.23mm) in a wide range of parallel and roller gap applications. Microprocessor based and application software driven, GAPMAN records and stores data points for easy transfer to SPC and other quality systems. Additional information is available.
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They should be considered as part of the traditional range of
sensors with the difference that electronic portion is
completely separate from the sensing part which is
in the form of an extension which can withstand temperature
from -200 ÷ +250 °C.
These products are used to control the levels of hot
materials such as liquids, oil, powder and plastic granules.
They also sense solid metallic and non-metallic bodies positioned
in areas of high temperature. ALSC Amplifier in plastic housing
with UNDECAL PLUG
-Supply voltage: 24Vac or 110/220 Vac
-ALSC-1 CH type suitable for one sensor
-ALSC-2CH type suitable for two sensors
-Led incorporated
-Sensitivity adjustment
-Relay output changeover 5A to 220 Vac
Sensors for high temperature: stainless steel housing
M18 and M30, sensitive side PTFE
-Provided with connector for connection to the amplifier
-cable length: 2 or 5 metres
-min./max. working temperature from -200 ÷ +250 C
-sensing distance: 5 mm for type SC18M-HT and 15 mm for
type SC30M-HT
-degree of protection: IP68
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HIGH TEMPERATURE SENSORS
Significant scientific and engineering enhancements in advanced materials, Pre-Process and In-Process production methods and in-site testing methods are driving the demand for displacement sensors that can handle extremely high temperatures up to 1832°F (1000°C). Contemporary producers of aircraft engine rotational alignment, plate glass, materials testing extensometry, continuous flow steel, now use standardized high temperature Capacitec sensor solutions for in-process applications to control the quality of their production on a real time basis. Qualification testing of disc brakes, jet engine dynamics and high speed shaft rotations also rely on Capacitec sensors. Advanced materials for automobiles, structural components, and aircraft are also tested for strength and durability with the use of Capacitec's line of extensometers and clip gauges.
High Temperature Major Applications:
- Disc brake testing
- Silicon Wafer processing
- Metal and Glass forming
- Jet engine thermal expansion
- Material strength testing
- Mold separation
- Turbine testing
- Strain Extensometry
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