SENSORES
Sensores Digitales TIPOS ■ Electromecánicos ■ Magnéticos ■ Inductivos ■ Capacitivos ■ O pticos ■ Ultrasónicos ■ Neumáticos DIANI JULIET SALCEDO CABEZAS
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SENSORES
CLASIFICACION TIPOS DE SENSORES DE PROXIMIDAD
Sensores de posición magnéticos
Sensores de posición Inductivos
Sensores de posición Capacitivos
Sensores de Posición Opticos
Sensores de Posición Ultrasónicos
Sensores de Posición Neumáticos
Con Contacto
Barreras de luz
Barreras Ultrasónicas
Sens. Obturación Fuga
Sin Contacto
Sens. Reflexión Reflexión directa
Sensores Ultrasónicos
Sensores Reflex
Salida neumática
Barreras de Aire
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SENSORES
INTERRUPTORES DE POSICION ELECTROMECANICOS Con los finales de carrera mecánicos, se establece o se interrumpe un contacto por medio de una fuerza externa. La vida útil del contacto es de un máximo de 10 mill. de ciclos de interrupción. Dependiendo del diseño, pueden transmitirse tensiones e intensidades relativamente elevadas. En el caso final de carrera mecánico, el espacio que separa dos contactos abiertos de diferente polaridad se conoce como el intervalo entre contactos. Los tiempos de conmutación de los finales de carrera
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SENSORES
■ ■ ■
■ ■
■ ■
TIPOS DE FINALES DE CARRERA: Interruptores miniatura de posición Interruptores de control Interruptores de ruptura brusca o de contacto progresivo Interruptores de posición al aire Interruptores de posición sumergidos en plástico y en metal Interruptores de posición de seguridad Interruptores de posición de precisión
Material del Contacto: Níquel - Oro, oro fino, plata, óxido de plata - cadmio, plata - paladio y níquel - plata
Datos técnicos de un final de carrera: Capacidad de ruptura :24 V DC, 6A (250 V AC, 6A)
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SENSORES
INSTALACION: ■ ■
Se debe restringir la máxima intensidad , ya que esta conduce a la formación de picos Cuando se interrumpen cargas inductivas, se crea un pico de alta tensión
Precisión en relación con el montaje Rigidez de la conexión del interruptor/Soporte I + 24 V DC L R Cuidadosa observancia de los dispositivos de actuación V D En caso de conexiones a presión o atornilladas, utilizar terminales aislados 0V No recalentar los contactos en caso de de El circuito de protección puede ser un RC, un soldar los cables diodo o un varistor; L
■
■
■
APLICACIÓN: ■ ■
Ambientes con elevado ruido eléctrico Tareas muy precisas (interruptores con precisión hasta 0.001 0.001 mm)
+ 24 V DC
V
I
R L
L
C R
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SENSORES
VENTAJAS •Precio moderado •Sirven para ambientes con elevado ruido eléctrico como resultado de campos electromagnéticos •Tienen una amplia gama de aplicaciones •Los sensores Mecánicos Neumáticos por no tener contactos eléctricos es imposible
DESVENTAJAS En operaciones de conteo pueden haber rebotes de los contactos
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SENSORES
SENSORES DE PROXIMIDAD MAGNETICOS FUNDAMENTOS: El interruptor reed es el método más sencillo con el que se detecta un campo magnético. Dos láminas flexibles de material magnético se unen por medio de un campo magnético externo, estableciendo un contacto eléctrico. El cierre de este contacto no esta exento de rebotes. r ebotes.
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SENSORES
DESCRIPCIÓN: Las láminas de contacto en material ferromagnético (Fe-Ni aleado, Fe= Hierro, Ni= níquel) están selladas dentro de un pequeño tubo de vidrio. El tubo se llena con un gas inerte. Si se acerca un campo magnético al sensor las láminas se unen por magnetismo y se produce un contacto eléctrico. eléctrico. CARACTERISTICAS TECNICAS
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INSTALACION:
SENSORES
Que no haya interferencias cerca del sensor, con un campo magnético mayor de 0.16 mT. Si se montan varios cilindros neumáticos con estos sensores, se requiere una distancia mínima de 60mm entre ellos y las paredes externas de los cilindros adyacentes, para no producir puntos de conmutación conmutación no deseados. deseado s. deseados. Reducir el máximo flujo de corriente para evitar
BN(1) + 24V DC BN(4)
R L R
BU(3)
0v
Sensor con diodo emisor de luz incorporado para indicar su estado + 24 V DC
I
R L
L
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SENSORES
VENTAJAS
Reed •Si se le aplica un imán al objeto a detectar se pueden solucionar muchos problemas Los magnéticos inductivos comparados con los Reed tienen las siguientes siguientes ventajas
DESVENTAJAS Reed •Se debe asegurar que no haya interferencias cerca del sensor con campo magnético mayor a 0.16 mT. De ser así el sensor debe apantallarse Los magnéticos inductivos
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SENSORES
SENSORES DE PROXIMIDAD INDUCTIVOS
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SENSORES
CARACTERISTICAS TECNICAS
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SENSORES
OBSERVACIONES SOBRE LA APLICACIÓN:
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SENSORES
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SENSORES
SENSORES DE PROXIMIDAD CAPACITIVOS
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SENSORES
TAMAÑO MINIMO DEL OBJETO: ■
■
■
■ ■
■
El tamaño depende del ángulo de aceptación del rayo ultrasónico. Si las ondas ultrasónicas se dirigen a un objeto demasiado pequeño, cualquier objeto que se halle al lado o en el fondo, puede interferir Se recomienda hacer ensayos previos desplazando la placa de verificación lateralmente hacia el objeto a detectar, mientras se observa la distancia de conmutación.
POSICION DEL OBJETO: En superficies planas e inclinadas el sensor no recibe eco de la señal Los objetos con superficies lisas y regulares,
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SENSORES
Efecto de la temp. ambiente, humedad y presión atm.: La velocidad de los ultrasónicos depende aprox. En un 1.8% por oC de la temperatura del aire. Se puede producir un pequeño cambio en el punto de conmutación por no tener compensación por temperatura. La humedad a una temperatura por debajo de los 40oC, afecta un cambio máximo en la vel. Del sonido de un 1.4% con una humedad relativa entre el 0% y el 100%. Los cambios naturales de presión atmosférica no producen cambios
Efecto del ruido ambiental: Ya que las frecuencias de transmisión está es tánn en en la la ga gama ma de 30 kH kHzz ha hast staa 30 3000 kH kHzz y debido a la limitación de la banda del receptor, estos sensores son poco sensibles a ruidos externos.
Ejemplos de aplicación: Para supervisar los niveles de llenado en silos Control de transportadores automáticos en almacenes Control de un bucle entre rodillos de alimentación Clasificación según diferentes alturas
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SENSORES
VENTAJAS •Pueden detectar una amplia gama de diferentes materiales •Detección segura de objetos transparentes •Insensible a la suciedad y al polvo •Se puede aplicar al aire libre •Detección sin contacto con puntos de conmutación de precisión variable. La zona de detección puede dividirse a
DESVENTAJAS •Su velocidad esta limitada por la máxima frecuencia de repetición de pulsos • No se puede aplicar para objetos con superficies inclinadas, ya que el sonido se desvía •reaccionan con relativa lentitud •Son generalmente mas costosos que los sensores de proximidad ópticos (casi el doble)
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SENSORES
SENSORES DE PROXIMIDAD NEUMATICOS FUNCIONAMIENTO: Detectan la presencia o ausencia de un objeto por medio de chorros de aire que detectan sin contacto. Cuando se presenta un objeto, objeto, se produce un un cambio en la presión de la señal, que posteriormente es procesado. procesado. VENTAJAS: Seguro en ambientes con suciedad Funcionamiento seguro en ambientes de elevada temperatura Pueden ser usados en ambientes con riesgo
CLASES: Sensores por obturación de fuga Sensores de reflexión Sensores de barreras de aire
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SENSORES
SENSOR DE OBTURACION DE FUGA La obstrucción de un chorro de aire que fluye por un taladro, por medio de un objeto a detectar, produce una subida de presión en la salida del sensor, sensor, hasta el SENSOR BARRERA DE AIRE nivel de la presión de alimentación.
Situando una boquilla anular emisora directamente frente a una boquilla anular receptora se forma una barrera de aire que puede interrumpirse por un objeto o con otro chorro de aire. Puede cubrir distancias de hasta 100 mm
SENSORES DE REFLEXION
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SENSORES
APLICACIÓN: ■
■
Se debe reducir la presión de aire del sistema a la zona de baja presión por medio de reguladores de presión Por tener una señal muy débil se debe conectar a continuación un amplificador de presión capaz de resistir la presión de alimentación, cuando se cierre totalmente
EJEMPLOS DE APLICACIÓN: ■
■
■
■
Medición de la velocidad de transporte de pantallas para impresión de seda Supervisión de herramientas donde el ambiente es sucio Comprobación de agujeros después del taladro Verificación de la planitud de placas
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SENSORES
VENTAJAS ■ ■
Areas con riesgo de explosión Zonas de soldadura que generan fuertes campos de interferencias AC y DC
DESVENTAJAS ■
Dado que el costo de un sensor de proximidad neumático completo completo (boquilla y amplificador de presión/ Interruptor Interrupt or de presión) es es Interruptor
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SENSORES
CONEXION EN PARALELO DE SEN ENSORE SORES S DE DE PROXII MIDA PROX MIDAD D UTILIZAND TILIZANDO O LA TECNOLOGIA TECNOLOGIA DE TRES HILOS
En estado inactivo, la corriente . de los sensores de proximidad residual conectados en paralelo se acumula.
+24V DC
. BN(1)
BN(1)
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SENSORES
CONEX CONE XION EN SERIE DE SENSORES DE PROXIMID PROXIM IDAD AD UTILIZANDO LA TECNOLOG TEC NOLOGII A DE DE TRES HILO HILOS S
Las sali salidas das de cada un unoo de estos senso sensore ress .conectados . . en serie se cargan progresivamenn te: su ma me madd a a la corri corri en te consu consumid midaa
.
+24V DC
BN(1)