Sensors, systems of automatic control
do Not always have the opportunity to look into some equipment or container or Cabinet, to control the work, but the decision was all there. There are different range of sensors which can be tied according to a specific logic on the device and as a result know that at some point of time occurs in the controlled area in the chain of machines and equipment.
Last time sensing elements or as they are called "sensors" appeared a lot, in my practice I use mostly electronics and sensors electrician Schneider, everything just integrates and works reliably.
the Sensor, depending on certain conditions submits to chain what to a "distortion", which in turn go on a processing device, where the difference signal is filtered and fasting is amplified to the control. Can this signal in a feedback tie on any parameter of the circuit. If for example the temperature in the chamber increases and the sensor signals increase above the norm, then the signal from the sensor will switch on the fan and the temperature again falls to a level lower actuation in the chamber and the fan will turn off. Sort of a simple automation system.
In General in electronics production sensors are working mainly as switches and circuit breakers for any process, they either change the piece the resistance of the circuit, or depending on the system generate an electrical impulse.
In principle, the sensors they are all the same and differ only design feature, the parameters of output signal, mounting system, and by appointment. It is important of course for optimal operation of the automatic control system to install the sensor as close as possible to the area of adjustment, so the error was as small as possible. For example in the steam generator sensors there are three of them, the upper level sensor, it tells the system that you want to disable plunger pump and pumping the water into the tank, the lower level sensor, which in case of activation causes a power cut, not burned tena without water in the tank. And the average level sensor, which gives information about the system is readiness for operation. Simple and easy, but without these sensors, the generator would not work. The sensors are exactly where the normal eye is simply unable to see that either in consequence of certain difficulties. is the Most common temperature sensors
They are still just called a "thermocouple", it can be and contact mercury thermometer and RTD in a bridge circuit and a lot of different devices in order to transmit to the Executive device of the system signals for decision. Temperature sensors themselves are simple and work on the principle of change of resistance depending on the ambient conditions. Here is a simple circuit of the thermocouple. There is also the pressure sensors
, they are used where it is necessary to monitor the pressure in the closed space, a diaphragm type, it is to say conventional pressure gauges or contact manometers, which are used for example in autoclaves. On reaching a certain pressure, the system switches off and when the pressure drop is enabled. There is also ambient light sensors
, is a wide range of sensors that are used on boilers and in street lighting and in General everywhere where you need to manage or use in controlling the illumination of a sign.
the Sensor is a contact type and a contactless hermetic. The essence is that the contact is not always possible to use, in hazardous industries such sensors taboo. Sensors without contact type is more expensive, but the resource they are and the scope is broader. That is basically what you need to know about the sensors in automation systems and control. I think it is clear, if not write, talk to any of the known at this time of the sensors.
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