Different control sensors Essay Example for Free

Different control sensors Essay The idea of a pressure sensor is to ultimately measure and monitor the pressure of either gasses or liquids. But, what is pressure? Well, pressure ultimately is an expression used to describe the process of the force that is used when restraining a gas or a liquid from expanding. It has a certain measurement normally in the force per unit area. When the pressure is measured it can be monitored in a number of ways, but, most typically it is done with an electrical signal. We can see many examples of pressure monitors/switches in appliances all over the world today. Pressure sensors are found in items such as cars and lifts. For example, a person walks up to a door and they wish for it to be opened on arrival, with a pressure switch located in the floor as soon as the pressure switch is activated the door will open, this form of switch will tend to require a form of displacement. Another example if where a pressure switch/monitor may be found is within a car. When the tyres reach a certain pressure the control system kicks in and then they are warned to pump them up. If we consider large industries such as factories with combustion engines then we need to bear in mind that there needs to be some form of indication when present conditions change within the mechanism, this is also where a pressure sensor will come in handy. The picture on the top left of this paragraph is similar to what may be found in an industrial placement. A Rotary Switch A rotary switch is used when we have a devise that needs to operate or change to two or more different states, for example, a rotary switch may be used for; A fan that regulates heat at different speeds A radio that needs to operate on different frequencies The most common type of rotary switch is the rotary light switch, and the way in which this works is pretty straight forward. A rotary switch is a device that has a rotating shaft connected to one terminal capable of making or breaking a connection to one or more other terminals (the rotating shaft can be seen in the picture on the left) to many other types of electrical switching mechanisms, the electromechanical rotary switch provides a desirable means to control large numbers of circuits over a wide range of currents, voltages and power requirements. Rotary switches provide electrical control for the following types of equipment; Medical equipment, Aircraft, computers, Â  Industrial controls, Â  Communication, Â  Ordnance, Â  Ground support equipment Different types of rotary switches are used in a variety of electric devices. They are in the form of at least two parts and have a rotatable switching means arranged in a grouping and a rotary knob having a coupling element which can be pushed into or onto the switching means. The rotary switches are provided with a contact/sensor system and with a detent mechanism. The detent mechanism determines the number of possible switch positions. Rotary switches may feature different switch positions that can be set by rotating the switch spindle in one or another direction. Rotary switches may convert positions into binary numbers; such switches are known as coded switches. A rotary electromechanical encoder includes the overall characteristics of a rotary switch, but has additional mechanical movements. Pyrometers A pyrometer comes in very useful in industrial places where measuring and controlling inputs and outputs of a computer system become far too dangerous for a human to undertake the responsibility. It is often used to determine and control the temperature; however, it can also be used for radiation purposes. The word pyrometer is derives from the Greek word for fire, and the Greek word for measure, which is meter. As previously said, pyrometers are optical aids and although now days there are many forms of pyrometer as the need for more specific, demanding control systems are required the most basic still works on the principle below; On the previous page we can see how a basic optical pyrometer works, the only problem being that it can display temperatures that are high (up to around 700oC, but is inefficient for very low temperatures. As temperature inside the work place/furnace increases, so does the filament inside the pyrometer giving off a red colour, indicating the heat capacity. Using digital readouts the user can use the pyrometer to calculate the temperature of the material and also use the pyrometer to heat the material or furnace, or wherever the control system is placed to whatever they require. Thermocouples A thermocouple is a very simple heat/temperature sensor and comprises of two components. One end is joined tightly and the other end is separated. It is the end that is separated that is considered to be the output of the control system, and this is the end that actually generates the voltage. This voltage is then proportional to the heat or temperature to which it is measuring. This then means that the hotter the temperature the more voltage is output. Below can be seen the two most commonly found applications of thermocouples; Measuring room temperature Monitoring the presence of a pilot light It is the actual materials used within the control system that determines the application. There are then thermocouple types derived which can be used for differing purposes. Thermocouples are easy to use and require no batteries or fancy electronics. However, the voltage signals generated are very small so an amplifier may be required if you wish to read the temperatures into a computer Control System Thermometers Control system thermometers consist of a normal day to day thermometer thats connected to an electric circuit. Then, when the heat/temperature reaches a certain level it can be indicated or displayed in a number of ways, for example if connected correctly we could have it so that the temperature, when it hits 20, displays a red light located somewhere else, and, then when it falls below the light goes off. Inductosyn The idea of an inductosyn is to read the measurements of current within a system and then make extremely accurate measurements or movements based upon these readings. The principal in which it works is as follows. Incremental Absolute An inductosyn has a metal block in which grooves are cut out. Along these grooves are continuous strips of magnetic metal, then, a current is passed from one end to the other. The sliding block has an identical strip set in to it completes the circuit when connected with the other strip. Now we have the possibility of resistance change, by sliding the sliding block from one end to the other we have a system that changes the resistance of the circuit. This then increases and decreases the current accordingly. This is then output to a display which the user can see. This relationship between current and movement can then be used to move objects very small distances with a tremendously high degree of accuracy. This is all based on the current. Thermistor A thermistor is a type of resistor that varies resistance in a computer control system according to the temperature readings. Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in temperature. A temperature sensor application would be compared to that off the one found in a central heating system. A sensor would detect the temperature in the air, by using a thermometer and then change as desired using something like a thermistor. The thermistor would act as the thermostat. Therefore, when the thermostat is changed, we can change the output of the heating system accordingly. The thermistor is widely used and often unknown to the untrained eye. Linear Limit Switches The theory behind the linear limit switch is very straight forward. Basically the linear limit switch is a button, that when activated starts a process. In relation to computing its like an event drive operation. For the linear limit switch to be activated it must be pressed. For example, in a lift, how do we get the lift to stop going up, or, stop going down, or stop on the right floor. It would be of my opinion that a linear limit switch is implemented, so that when the lift reaches the required floor, a switch is activated and the lift stops and the doors open. However, its not limited to lifts, the linear switch is a very common device. In the picture on the left we can see a clear example of a linear limit switch. The operation needed to be performed is for that of the swimming pool cover, when the cover reaches the end of the pool the switch is pressed and the motor stops working, this then stops the problem of the cover falling off of the reel.

So many Gods, So Little Time: Contemplating Religion :: Religious Religion Biblical God Essays

So many Gods, So Little Time: Contemplating Religion The man watched with a blank gaze out the window of the plane. The scenery below passed him by; buildings and streets mostly. But they were remarkably close to the plane; much closer than they should be. This man had previously been sitting in the passenger section of the plane, but he now sits in the pilot seat. The real pilot lay on the floor with his throat splayed open by a box-cutting knife. His bloody gurgles had long since ceased as his eyes fixed on the ceiling with a stare only death can bring. He was of no matter; only one of many deaths that would come today. The other men in the cockpit chanted prayers silently to themselves. Prayers to a wrathful and unsympathetic God. A God that had sent them on this ‘holy’ quest. A building comes into view, and the plane begins heading straight for it. It lands home, searing concrete from metal, flesh from bone, disintegrating bone to dust. People die, and others rejoice in it. People die, and other s thank God for their homicidal salvation. People die, and the survivors ask God ‘why?’ I ask God not ‘why did this happen’, because no God had a hand in this. No person was on a quest from God. Fanatics who had handed themselves the will of God did this. I ask God ‘why do we end lives over pointless arguments about you?’ Religion can be a funny thing. It can cause many events to happen, good and evil. Many people have found a sense of peace through religion while others have found a reason to kill people and cause war. What is this creature called religion that can cause two such completely opposite things to happen? What is it about religion that is appealing to any human being? Why do people give up so much to follow the ways of religion? Because, in the end, religion is designed to force its followers into a form of submission in which the follower gives up his or her most basic of urges for the greater good of society and themselves.

Chem 130 Chp. 15

Chp. 15 Chemical equilibrium: Occurs when a reaction and its reverse reaction (opposing reactions) proceed at the same rate At equilibrium the rate at which products are produced from reactants equals the rate at which reactants are produced from products At equilibrium a particular ratio of concentration terms equals a constant The composition of an equilibrium mixture does not change with time Kc: equilibrium constant 15. 2 Law of mass action: expresses the relationship between the concentrations of the reactants and products present at equilibrium 5. 3 * * LARGE VALUE OF Kc: Equilibrium mixture contains more products than reactants = product side (right side) K > 1 *SMALL VALUE OF Kc: Equilibrium mixture contains less products than reactants = reactant side (left side) K < 1 The equilibrium-constant expression for a reaction written in one direction is the reciprocal of the one for the reaction written in the reverse direction Multiplying all the stoichiometric coefficients by a n umber gives the equilibrium constant for the original reaction raised to that number 15. 4Concentrations of PURE SOLIDS and LIQUIDS DO NOT appear in equilibrium expression L S 15. 5 ICE TABLS 15. 6 15. 7 Le chateliers principle: IF a system at equilibrium is disturbed by a change in temperature, pressure, or the concentration of one of the components, the system will shift its equilibrium position so as to counteract the effect of the disturbance % of NH3 at equilibrium decreases with increasing temperature and increases with increasing pressure * * Endothermic reaction: increase in temperature shifts equilibrium to right reactant bsorbs heat Increasing T results in an increase K * Exothermic reaction: Temperature increase shifts equilibrium to left product gives off heat Increasing T results in decreasing K * * Increasing pressure ( decreasing volume): equilibrium shifts in the direction producing the smaller number of moles of gas will reduce the pressure * * Decreasing pressure ( increasing volume): equilibrium shifts in the direction producing the larger number of moles of gas produces more pressure

Disney and Pixar Alliance - 2230 Words

Disney and Pixar have created many recognizing animation together over a decade that most people might not know that. The alliance has proven a success from many animations like Toy Story, Finding Nemo, Up and etc. Both company have allies to make many animation which led to Disney acquire Pixar. The alliance looks like a simple task at first for both companies as they only contribute certain resources to the partnership but the more time passes the more difficult it’s become. The relationship was started in 1978 as they were working together on the CAPS 2D production system. The alliance went quite well at first as itthey generated profits to both companies and they ended up signing an agreement to produced animation movies together. Pixar and Disney produced seven films over the course of their alliance that end in June after Pixar delivering â€Å"Cars†. The company CEO Steve jobs tried to reach a new agreement with Disney CEO but failed as the agreement did not meet Pixar demands for more profitabilityresulting in some tension between Jobs and Disney CEO Michael Eisner at that time.However, they continued to talk after Disney changed their CEO to be Robert A. Iger (Disney buying Pixar for $7.4 billion, 2006). These talks ended up in Disney acquiring Pixar but both companies remain separate entities. The acquisition of Pixar happened as Disney saw a large potential as a competitors while they were in an alliance together which left them with onl y one option. Disney Pixar isShow MoreRelatedPixar1465 Words   |  6 PagesOctober 7, 2013 Strategic Management 5301 Walt Disney-Pixar Analysis The Walt Disney-Pixar merger carries a number of convincing advantages for Disney, but Pixar shareholders should be less enthusiastic about such a deal. Pixar’s resources and capabilities have set a standard that is extremely difficult to imitate. 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