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Pizzato Elettrica introduces in the market of switches for potentially explosive environments a range of products that can satisfy the requirements of all the users. There are different switch series available in conformity with the directive ATEX 94/9/CE in the categories M2, 2G, 2D plus the new categories 3G and 3D (zones 2 and 22) introduced with the new regulations.
The approved products include both the position switches and the safety contactors with different contact blocks and actuators suppliers. To introduce these products on the market there’s a special brochure available which can be downloaded from the web-site www.pizzato.com.
Pizzato Elettrica is an established company with more than 20 years experience in the sectors of position switches and safety systems for machineries. The products are entirely planned and produced in Marostica - Italy in compliance with the standard ISO 9001 and they undergo the inspection by a third party for product conformity. |
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Position switches for high temperature
For more than 20 years Pizzato Elettrica has been producing one of the world most wide range of position switches, safety switches suppliers, microswitches, foot switches. Pizzato Elettrica products are usually used worldwide in different industrial sectors characterized by their reliability and their quality/price ratio.
Eventually the range of products in the survey sector has been growing covering very specialized sectors such as switches in conformity with ATEX directive and switches with electronic contacts.
Among the various new products 2007 Pizzato Elettrica has introduced a new series of position switches especially studied for high temperature application. These products are characterized by their long mechanical life in relation to the working temperature, that is up to 1 million operation cycles at +180°C.
A dedicated brochure on these new products is available on the website www.pizzato.com. |
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Position switches are used wherever moving parts on machinery and plants need to be positioned, controlled and monitored.
The design details in relation to body dimensions, materials, electrical loading capacity, rated values and quality characteristics are to a great extent determined by the variety of application, from precision mechanics to heavy engineering.
Many of the position switches fulfill the requirements of the IEC 60947-5-1 product standard and can therefore also be used as position switches with safety function.
The position switches are available with snap action or slow action.
A wide variety of actuator specifications heads are available. The majority of units are also obtainable with metal rollers.
The position switches are shown in the sequence of body sizes, starting with the smallest design.
Schmersal make both standard and AS-i Safety at Work safety modules.
Click here to see the AS-i models
Or for the standard models click below
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Position Sensing Solutions
Bimba offers pre-tested Position Sensing Solutions for Bimba actuators suppliers. Our solutions provide a cost effective interface between the industrial pneumatic actuators and electrical control systems. Our pre-tested solutions also eliminate costly, time-consuming design and fabrication required if switches are purchased separately and provide an aesthetically pleasing installation.
Both traditional Bimba switches as well as newer generations of Bimba switches are offered to allow for maximum flexibility to fit your application.
The switches perform the same functions as conventional limit switches suppliers. They can be used as position indicators, cycle counters, or to confirm operation.
All Bimba switches are designed to sense a magnet that is incorporated into the piston of the cylinder. Magnets are standard in Bimba MRS cylinders, but must be purchased as an option on other Bimba actuators.
A variety of outputs are offered for each switch family including PNP (transistor sourcing), NPN (transistor sinking), normally open contacts, and higher power triac. |
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| Our huge standard programme with its diversity of housings has the optimal solution for almost any application. The various types of clamp supplier or the dovetail connections directly integrated into the switch mean that the switches can be fitted on almost any type of cylinder. Our range also includes pneumatic cylinder manufacturers switches for T-section cylinders. All the models can be supplied with dry reed contact with variable power capacities or in the electronic version. If you wish, we can develop completely new customer-specific sensors to meet your requirements. |
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Z/T and E.95 range position switches are suitable for sliding and hinged safety guards, which need to be closed to ensure the necessary operational security.
In combination with AES and/or AZR range safety monitoring modules all position switches class 1 shown in this chapter achieve Control Category 3 or 4 to EN 954-1.
Further applications for positions switches class 1 are most varied positioning duties. The variety of requirements to be found in practice can be met in detail by means of a wide range of actuating elements.
Design and mode of operation:
On the position switches class 1 the guarding device and the positive break NC contact are positively linked.
Schmersal make both standard and AS-i Safety at Work position switches with safety function.
Click here to see the AS-i models
Or for the standard models click below
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The range of detectors of Crouzet position is characterized by:
- A broad choice of metal enclosures or plastics
- An important range d%u2019organes of control (push rod, push rod with roller, lever, flexible device, etc%u2026.)
it possibility of connection per stuffing box, cable or connector specification
- A great resistor with the accidental shocks
- A good protector with liquid projections and the streaming
- Specific sensors, protected, miniature, of precision and for severe environments
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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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| The Microtrak II is a state of the art CMOS laser triangulation sensor for precise measurements of displacement, position, vibration and thickness. It is unaffected by surface texture, color or stray light. Measurement ranges are up to 40 mm at a standoff distance of 120 mm. |
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Hall-Effect Position sensor W/ Linear Output Voltage (HL)
Non- contact magnetic sensors that are designed to respond to a wide range of positive or negative magnetic fields and can sense relatively small changes in a magnetic field. By having magnet as a target, this unit produces a Ratio-metric Rail-To-Rail linear output. It also has an internal amplifier to boost the output to a higher level. These sensors are ideal for applications such as magnetic flux measurement, displacement, and linear output rotary measurement.
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In industrial processes where liquids, air or gases are used valves serve for dosing and control. There is a wide variety of valve types, butterfly or ball valves manufacturer being the most common quarter-turn types.
In large plants these valves are seldom operated manually. Mechanical actuation is normally done by separate actuators manufacturers. The valve position must be monitored electronically. This is necessary to give feedback to the controller when a certain position (e.g. "open" or "closed") is reached and to monitor the valves centrally from a control room.
Mechanical switches are still often used for position feedback on the actuator industrial shaft. For other solutions several proximity detectors are used together with a switching target for position detection. Disadvantage of these solutions: Mounting is mechanically complex. During switch mounting the signal wires can be reversed when they are connected in the top-mounted junction case. Where there are temperature fluctuations condensing humidity leads to corrosion and thus malfunction. |
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The new SMAT continuously detects the position of the cylinder piston within a range of 50 mm. It has an analogue output with an output signal in proportion to the piston position. The integrated OOR (out-of-range) sensor indicates if the piston is outside the sensing range. The connection for evaluating the 0 … 10 V and/or the 4 … 20 mA signal is made directly to analogue inputs.
Typical areas of application in object detection are as follows:
Press-fitting, clamping, position sensing, workpiece replacement
In process monitoring:
Sheet metal handling/production, wear monitoring, quality inspection
- The installation direction of the SMAT in the slot can be chosen freely.
- Contactless measuring principle = wear-free sensing.
- Measuring range is always 50 mm, regardless of cylinder; reproducibility 0.1 mm.
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Hall Effect Devices detect magnetic flux density (mainly produced by a permanent magnetic) and are used in both movement and position sensing. By integrating the sensing element onto the same silicon as its control logic and interface circuitry, Melexis has produced sensor chips with various degrees of intelligence to suit most applications. Sensing the rotation of shafts (e.g. cam- and crank-shaft) in engine, monitoring movement in motors and actuators suppliers, sensing pedal, throttle and steering wheel position, Melexis Hall Devices offer a reliable, contactless method of movement and position detection.
Melexis is a technological leader for the design, development and testing of integrated Hall Effect Devices. Melexis Hall Effect Devices enable an optimal use of the smaller feature sizes of which semiconductor technology is capable today. Therefore, very sophisticated mixed analog-digital signal conditioning circuitry (such as Chopped Analog String, Digital Signal Processing Core, Microcontroller) can be integrated. Most of the devices can withstand the severe automotive conditions despite few external components.
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The RACO path-sensory system has been specially designed for exactly positioning and switching off electro-magnetic actuators manufacturers in the final position. Not only is the position ascertained unconventionally by electro-magnetic means (e.g., gear-shifting mechanism) while doing so but it will also be determined via a close-coupled magnetic field without any movement.
The EPS consists of a printed circuit board and a magnetic holder with the magnet. The electronic positioning sensor (EPS) is integrated into the device%u2019s supplementary casing (A) on the motor shaft's end of the servo-motor or in the device's supplementary box (D) on the coupling casing. The installation, commissioning (starting up), maintenance (servicing) and upgrading is simplified in comparison with a conventional design that has mechanical limit switches suppliers and a shift transmission which must be adjusted individually.
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Features
All-electronically or reed contact
MZEK... can be fitted from above
MZ C... for Cylinders with 4 mm round slots
Absolutely wear-free
High reproducibility
Metal Case
Connecting Cabel 2,5 m (5 m) PUR or 0,3 m (0,6 m) PUR with knurled connector specifications M8
Bright LED
Short-circuit-proof
Polarity-safe
Protection class IP 67
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Honeywell's miniature position sensors respond to the presence or the interruption of a magnetic field by producing either a digital or an analog output proportional to the magnetic field strength. These Hall-effect sensors have single and double sensing elements for mounting on IC chips. These extremely small sensors come in a variety of magnetic actuation types including omnipolar, unipolar, bipolar, bipolar latch, ratiometric and analog. Termination types include radial lead IC and surface mount. Some products are available on tape and reel.
Best Used For:
Speed and RPM sensing, brushless dc motor commutation, motor and fan control, tachometer and industrial counter pickup, disc speed and tape rotation, magnetic encoding and flow rate sensing.
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One sensor, two adjustable switching points
Saves space, time and money
Simple alignment and definition of the switching point thanks to teach process
Easy mounting with only half the cabling work
Sensor sunk into the T-slot thanks to compact design
Applications: end position query to short industrial hoist cylinders or intermediate position detection, e.g., for reducing piston speed |
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