Photoelectric Switch
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 Omron E3MC X41 Photoelectric Switch  US $1,000.00
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 Sick MSLS02 25011 MSL Safety Photoelectric Switch US $540.00
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 Omron photoelectric switch e3ml xe4g 10 to 30vdc 4536853279431 US $399.99
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 Omron Photoelectric Switch E3S LS20XE4 12 24 VDC Ouput 80 mA 7126 US $220.00
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 Omron Photoelectric Switch E32 DH200 US $199.99
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 Omron Photoelectric Switch E3C VS7R NIB 2999 US $199.99
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 OMRON E3A2 R3M4D GN 3A 240V PHOTOELECTRIC SWITCH US $158.00
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 OMRON PHOTOELECTRIC SWITCH E3R CL2 10 30VDC 2M CORD US $155.00
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 Micro Switch LYS01E2S Proximity Sensor Photoelectric NEW US $150.00
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 Micro Switch FE MLS3B Photoelectric Control US $150.00
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 Carlo Gavazzi VPB1MNA Photoelectric Switch 7570 US $149.99
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 OMRON E3R 5E4 PHOTOELECTRIC SWITCH NIB US $124.00
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 OMRON E3S LS20XB4 PHOTOELECTRIC SWITCH E3SLS20XB4 New US $120.00
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 Omron E3B D2K US Photoelectric Switch 120 240VAC US $119.99
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 OMRON PHOTOELECTRIC SWITCH E3S 1E11 39 12 24VDC NIB US $100.00
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 SICK Photoelectric Switch KT2R 2B3721 US $100.00
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 Omron Photoelectric Switch E3R 5E4 5DE4 Sensor NEW US $99.99
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 SUNX CX21P J PHOTOELECTRIC SWITCH sd10m PNP DIODE PROT US $99.90
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 SUNX CX443 PHOTOELECTRIC SWITCH sd2 50mm NPN 12 24VDC US $99.90
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 SUNX EQ 22 PHOTOELECTRIC SWITCH sd0 40mm NPN 12 24VDC US $99.90
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 SICK Photoelectric Proximity Switch WT18 P610 US $89.99
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 Omron Photoelectric Switch E3X DA11AT S 12 24VDC 4787 B US $89.99
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 1 CUTLER HAMMER E51 SPL PHOTOELECTRIC SWITCH H2 2 US $89.99
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 Omron Photoelectric Switch E3S GS1E4 Used USED US $87.00
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 Omron Photoelectric Switch US $85.00
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 Omron E3Z G81 M3J Photoelectric switch US $80.00
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 Carlo Gavazzi Photoelectric Switch PMT20RIT NEW US $79.99
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 Lot 2pcs Omron E3T ST11 E3TST11 Photoelectric Switch US $79.00
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 LOT OF 2 PANASONIC N310P914A1 MICRO PHOTOELECTRIC SWITCH SENSOR NEW US $78.35
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 SICK WEU 26 2 113 PHOTOELECTRIC SAFETY SWITCH NIBBD US $75.00
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 NEW NO INSTRUCTIONS OMRON PHOTOELECTRIC SWITCH E3X A21 US $74.99
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 Omron photoelectric switch e3s ar86 10 to 30vdc 4536853283087 US $74.99
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 NIB OMRON PHOTOELECTRIC SWITCH E3A2 R3M4 US $74.92
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 Allen Bradley Photoelectric Switch Polarized 42GRU 9200 QD 10 40 VDC 7125 US $73.00
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 E32 D33 Omron Fiber unit photoelectric switch US $69.99
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 Omron photoelectric switch e3s bt11 l 12 to 24vdc US $69.99
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 SICK WT12 2P430 10 30V 4 PIN PHOTOELECTRIC PROXIMITY SWITCH US $69.95
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 NEW OMRON PHOTOELECTRIC SWITCH E3S X3CE4 US $69.72
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 OMRON PHOTOELECTRIC SWITCH E3XR CB4 NEW IN THE BOX US $69.00
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 Omron E3G L15 E3GL15 Photoelectric Switch US $69.00
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 New Omron Photoelectric Switch E3C S10 SET OF 2 2m US $69.00
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 Micro Switch Photoelectric Light Source LS2C US $68.00
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 PANASONIC N310P921B1 MICRO PHOTOELECTRIC SWITCH SENSOR NEW US $67.97
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 SICK WLL170A V330 10 30V 3 PIN PHOTOELECTRIC FIBER OPTIC SWITCH US $66.00
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Proximity Sensor / Switch
A Proximity Sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic or electrostatic field, or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor targets demand different sensors. For example, a capacitive or photoelectric sensor might be suitable for a plastic target; an inductive proximity sensor requires a metal target.
Proximity switches open or close an electrical circuit when they make contact with or come within a certain distance of an object. Proximity switches are most commonly used in manufacturing equipment, robotics, and security systems. There are four basic types of proximity switches: infrared, acoustic, capacitive, and inductive.
Infrared proximity switches work by sending out beams of invisible infrared light. A photo detector on the proximity switch detects any reflections of this light. These reflections allow infrared proximity switches to determine whether there is an object nearby. As proximity switches with just a light source and photodiode are susceptible to false readings due to background light, more complex switches modulate the transmitted light at a specific frequency and have receivers that only respond to that frequency. Even more complex proximity sensors are able to use the light reflected from an object to compute its distance from the sensor.
Acoustic proximity sensors are similar in principle to infrared models, but use sound instead of light. They use a transducer to transmit inaudible sound waves at various frequencies in a preset sequence, then measure the length of time the sound takes to hit a nearby object and return to a second transducer on the switch. Essentially, acoustic proximity sensors measure the time it takes for sound pulses to "echo" and use this measurement to calculate distance, just like sonar.
Capacitive proximity switches sense distance to objects by detecting changes in capacitance around it. A radio-frequency oscillator is connected to a metal plate. When the plate nears an object, the radio frequency changes, and the frequency detector sends a signal telling the switch to open or close. These proximity switches have the disadvantage of being more sensitive to objects that conduct electricity than to objects that do not.
Inductive proximity switches sense distance to objects by generating magnetic fields. They are similar in principle to metal detectors. A coil of wire is charged with electrical current, and an electronic circuit measures this current. If a metallic part gets close enough to the coil, the current will increase and the proximity switch will open or close accordingly. The chief disadvantage of inductive proximity switches is that they can only detect metallic objects.
Proximity switches are used in manufacturing processes for example, to measure the position of machine components. They are also used in security systems, in applications such as detecting the opening of a door, and in robotics, where they can monitor a robot or its components' nearness to objects and steer it accordingly.
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How much energy does a photoelectric light switch take to operate?
The photoelectric circuitry itself will only consume a fraction of a watt, an nearly insignificant amount.
WK
Photoelectric Sensors - 18mm Cube Sensors
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