Inductive analog sensors can be advantageous in the design of control systems of the machine. These sensors are particularly useful for applications requiring precision measurement and position detection, and for use in component coding. The final selection of a specific sensor, it is important to examine performance characteristics to the unit you choose is optimized to best suit the requirements of machine protection.

Inductive Machine Control
The sensors main reason why the industrial position with analog outputs are useful for system designers because of their ability to deny the need for discrete output switch. Instead of spending a quiet exit when an object reaches a certain distance from the face of the sensor, an analog sensor provides a variable output voltage and an output current proportional to the distance from the target sensor face.
Simplifying Machine Control Sensors Analog Design “Table 1 analog output signal of the sensor changes with the distance Source: Eaton ..”

This achievement is an ideal of analogue inductive sensor for applications that require precise position sensing and measurement. This type of functionality is very useful for an engineer end user the angular position of a rotating shaft to measure, for example. In designing an eccentric cam on the shaft and use the analog detector output proportional to the distance on the ridge, the designer can calculate the position of the axis.

In another application, such as inductive sensors analog deflection supervision of an essential element. For example, these sensors measure the axial deformation of a rotating blade, the control system can be designed to reduce speed on the sensor output, which makes them significant damage to the machine of a deformed sheet.
analogue sensors can also be used for component verification error, the identification of a cylinder to divert much of rejecting, for example. In another application of quality control typical insertion depth of a specific set of fixation or a secondary part of a measure and a series of control measures are taken based on the results. In more advanced systems, the sensors can be used for statistical process control to provide information (eg changes in section thickness measured in time).

Because many large inductive analog sensors to sensor manufacturers in this category and they all look at how the performance characteristics of a specific issue of analog sensors do? Where are all the same inductive analog sensors?

Questions Linearity
To answer this question, it is important to understand what is meant by the term “linearity” as applied to the outputs of analog sensors. This is illustrated by the solid line in Table 1.

In other words, an analog sensor that is “linear” has the same extent by the division during the full scale of the device. That means 1 mm change in the position of the object results in the same change in output voltage and current, or when the target object is in the range of the sensor envelope. In this case, the solid line represents the output of an analog sensor “linear”.
Simplifying Machine Control Sensors Analog Design “Table 2 non-linear signal output analog remote sensor Source: Eaton ..”

The dotted line represents a sensor with a nonlinear response. Using a device with the output characteristic, January 1 mm change in range of the target when this target in the middle of the range of the sensor will result in a change in voltage or current output is very different from the magnitude of change observed with the target on one side of the gamma-band or another.

How will this impact linearity characteristic of the design of your control? Consider an application where a cutting tool is located on a metal part in rotation, the position of the cutting tool according to the measured thickness of the material. If the thickness of the material increases, the tool is withdrawn and drops as the thickness, the position of the tool is moved indoors. A non-linear inductive analog sensor with a maximum range of 10 mm, positioned to measure the thickness of the 0-10V supply voltage measurements analog shown in Table 2 using different thicknesses of the room.

As shown, position sensors with analog output nonlinear used in industrial applications must be applied with caution, because the non-linearity, system design and place restrictions on the physical application of the sensor is difficult for use in OEM equipment. Looking at this table, it is clearly a compensation signal processing will be needed to cope with the obvious non-linearity. Because non-linearity in this case non-uniform at both ends of the sensor performs a table is probably easier to implement a compensation equation. Anyway, the developer of PLC code even more complex and the response of the equipment can be reduced only temporary solutions are created to deal with the nonlinear nature of this sensor output.
Simplifying Machine Control Sensors Analog Design “Table 3 linear analog output signal from the remote sensor Source: Eaton ..”

In cases where performance in the picture is not reproducible, then the operating range of the sensor may need to be confined to the central part of the band in an attempt to more “linear” part of the performance curve presented in Table 1. This approach also has its disadvantages, such as sensors in question are often very limited range of detection. If the decision is no longer “linear” part of the nonlinear sensor used in Table 2, the designer has a wide window centered 3 mm to 5.5 mm to cooperate. Managing a small window of this size range may be impossible and the power of the Creator in a sensing technologies completely different.

Reduce complexity
So what is a control system designer to do? Take the example above, but using a sensor with linear output (see Table 3).

In this case, the task of control design is much easier. No lookup table. No fee equation. Simplified PLC logic. And since the range of the sensor can be used, it can be pulled further away from danger. For OEM customers, this means a greater availability machine and a higher throughput and Overall Equipment Effectiveness.

These examples show that linearity is an important characteristic of analog position sensors. Fortunately, a new approach for the design of analog position sensor have produced dramatic improvements in linearity. In addition, technological advances have allowed manufacturers of sensors greatly increased operating distances in the supply of analog devices. Taken together, these improvements in the design allows the designer to control much more flexibility in the implementation of analog sensors on a machine, and serve to reduce the complexity of a system.

Pneumatic valves are currently used in many areas in industrial processes and civic water treatment. These valves are normally automatically by Cabinet conventional power, including terminal distributors, system I / O and communication interfaces via fieldbus.

Each individual in the pneumatic fitting process must be connected to the switch via an air line and a line of discrete Send comments. The cost for planning and installing these solutions are very high, especially in larger and more physically dispersed sites.

automation functions
In many cases, long lines of air traffic control have increased air consumption and a negative effect on the commutation of valves. An alternative to the conventional use of the central network control unit, integration of functions required in the automation of valves themselves. In this case, the process control system is only responsible for supervision and control.

At operational level, are pneumatically operated process used, which can all automation components components are installed as a pilot with manual control, electrical and optical feedback of status indication, including fieldbus faces and even positioners and process controllers.

Plants on the basis of these decentralized systems, distributed automation are working with complete intelligent valve. By integrating the AS-Interface (ASI) as a fieldbus interface, the overall benefits of this approach are fully exploited. All that is necessary for power, feedback and communication is a tie line between the two son PLC with up to 62 valves.

Each valve process is directly connected to the main line in the air, these compounds as short as possible. This reduces the number and length of pipe and cable and the number of required attachments to a minimum.

Valve systems themselves are designed to deployed on the ground in difficult conditions for the robust life of service and long term. Consequently, they have high IP required by the effective implementation and exclusively from weather and chemical resistant materials.

The IP protection is not affected by prolonged use in environments ENVI exposure, high humidity or chemicals. Compared with conventional automation, design marks a real advance towards robustness.

There are other advantages to the reduction of electrical wiring and fewer lines of air traffic control. A status indicator clearly visible in the integrated connector allows the operator to monitor the processes and the operational status of valves not only a central control level, but also directly on the connector.

conventional automation solutions by cabinet, the drivers are used in the factory equipped with an electric feedback. Innovative Valve systems go a step further and restoration for the integration of pilot valves with manual controls, optical position indicators and other functions within the automation stainless steel compact and robust.

Configuration options
Depending on the application, users can choose between different devices and configuration options. The wide range of available options include mechanical switches, inductive proximity switches and NAMUR initiators and indicators of mechanical position and self-final position of linear actuators with inductive sensors move ment.

Basically, distributed on the basis of automation systems intelligent valve begin a process valve with electrical feedback integrated, single optical feedback and integral pilot. These systems already have done with the valve terminals in the enclosures. Moving up a step in the modular program distributors, users can obtain the benefits described above decentralized automation.

In addition to the electrical feedback and the pilot, these solutions include the large size of super-bright colored LEDs for feedback enhanced optical FACIL is monitoring inter-process in the field, and an optional AS-interface as an interface fieldbus with all these functions integrated into the valve system.

The actuator housing is purged with compressed air at each air passage is provided solely controlled by the pilot. This means that after switching, a small volume of control air is supplied into the case. This process takes less than 10 milliseconds and allows a slight pressure builds up in the housing, a new improved protection of intellectual property and preventing the concentration Pene humid air, as in the case of temperature changes or start / immersion.

The pressure relief valve lets you keep backup of pressure in the housing automatically reduced if, after several process switching points, reaching a value of approx. 0.5 bar. The valves meet the same high degree of robustness and process valves.

Regarding rhythmic opening of the valve when we supply to solenoid valve valve will move rooms valve immediately and end position allowing valve open or closed end position of his own or run an on-off time, but For additional Su Nation. Accessory Cable valve is opened by electrical signals that power valve to let more or less the 0-10 V dc power supply to the forward movement ด์ 0 v valve power to move forward ด์ 1 v valve room open valve. to 10% the oil flow from the valve to be only 10% (assumed).

When power supply to 5 V valve opening to half power to 10 V valve 100% open top allows the full flow of oil.

The postponement of the valve. Commander will affect flow Of oil to the cylinder is more or less out fast or slow motion by controlling the electrical signal.

Proprotional valve diagram

He called the proprotional valve, it is proportional to electrical signals.

   Have you checked the car for your tutorial system at one point or another?

   Have you ever had an industrial air hammer?

   Have you ever installed an electric bell?

     If the answer to any of these questions, then you are probably know what a solenoid valve.

hydraulic solinoid valve

Solenoid valves are electromechanical valves, by stopping or movement of electricity through a coil to be controlled to change the status of the valve. A coil is a coil of wire, the magnetic when electricity runs through them.

     Solenoid valve to activate when using this coil, the valve, thereby controlling water flow, airflow and other things with electricity.

    In general, there are three types of solenoid valves: The all-purpose type, a type of low-pressure steam and high pressure steam type.

   Solenoid valves are composed of several parts, such as wrapping, covering electrical connector nut, cartridge seal, O-ring connector end, body and nut.

  All these components are critical to the overall performance of the solenoid valves. If a malfunction, it will affect the overall operation of the automotive system for beginners as well as industrial air hammer and installation of electric bell.

   Therefore one must always be maintained and regularly inspected to

Valve Coil

 maintain the solenoid valves work best. But like all other parts of the starter system, an air hammer and an electric bell, the solenoid valve can be damaged after a certain time. Thus, solenoid valve replacement will be necessary. It? Good thing is that many dealers, the quality solenoid valves and inexpensive service. Forget when selecting valve coil, not you, check the valve type, mesh size, pressure rating, coil voltage and the type of connection to each port. Gates provides detailed information on valves, EGR valves, solenoid valves, ball valves, etc.. Valves in conjunction with copper sinks.