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Capacitive Metrology Sensors Introduction
PI capacitive (capacitance) sensors are the metrology system of choice for the most demanding nanopositioning applications. They are absolute-measuring, high-dynamics devices. PI capacitive transducers / control electronics use a high-frequency AC excitation signal for enhanced bandwidth and drift-free measurement stability (subnanometer stability over several hours, see Fig. 6, on Link).
They enable direct measurement of the moving platform and are especially well-suited for multi-axis measurements in parallel metrology configurations. Parallel metrology means that the controller monitors all controlled degrees of freedom relative to "ground", a prerequisite for active trajectory control.
Capacitive sensors also offer the highest linearity (accuracy).
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Capacitive sensor - 4B BINSWITCH
- Application: level indicators (tanks/silos); choke switches (chutes, conveyors manufacturer, industrial 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 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 manufacturers 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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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 manufacturer
Operating Voltage: 115 or 230Vac (50/60Hz)
Output: 1 SPDT (5A - 250Vac)
Operating Temperature: 14 to 140ºF |
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| Capacitive manufacturer of 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 supplier is of prime importance. Sensors supply the necessary signals on positions, end stops, levels or serve as pulse industrial transmitters for counting jobs or for monitoring rotational speed. In industrial usage inductive and capacitive proximity detectors 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 detectors 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 source and output must be mounted outside the hazardous area). |
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The capacitive detectors 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 evaluate the change in capacitance which occurs when an object enters the electrical field of a capacitor manufacturers. When appropriately dimensioned, the capacitive sensor is also able to “see through” certain non-metallic materials. This ability makes it the classical level indicator, sensing the level of liquids and granular products through container walls..
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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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Capacitive detection
Capacitive sensors detect metal objects as well as nearly all other materials and are used in various applications including level and flow control.
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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 detector for position-compensated measurement and easy insertion into very narrow gaps down to 0.009" (0.23mm) in a wide range of parallel and industrial 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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HIGH INDUSTRIAL 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 industrial 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
- Industrial turbine testing
- Strain Extensometry
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Function
Remote detection of liquids or any type of object, whatever the material (wood, plastics, liquids, metals, papers etc).
Areas of use
Food industry, level control, packaging etc.
Advantages
No direct contact with the object to be detected, no wear and tear, very small reaction time, long life expectancy irrespective of the number of detections, LED condition display. |
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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 manufacturers.
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. Favors: detection until 200° C.
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