Help with Photoelectric Sensors specifications:
Specifications
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| Operating Distance | Range of distance measurement, or maximum distance measured. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Operating Temperature | The temperature range over which the device must operate. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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Optical Technology Type
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| Technology | |||
| Your choices are... | |||
| Through Beam | Through beam (or opposed mode) sensors incorporate a transmitter and a receiver on opposite sides of the target and evaluate absence or presence based on transmittance or blockage of the beam respectively. | ||
| Retroreflective | This design incorporates the emitter and detector in one body with parallel beams; a reflector opposite the target path is used to reflect the emitted beam back to detector; presence is detected when reflected beam is interrupted by an opaque object. | ||
| Polarized Retroreflective | Variant of the retroreflective in which the emitter and receiver have polarizing filters 90º apart, thereby making the reflector the only recognizable source. This is used to prevent false detection from sources other than reflector. | ||
| Diffuse | Emitter and receiver are packaged together. Presence is detected when any portion of the diffuse reflected signal bounces back from the detected object. Reflective properties of the target must be evaluated for correct placement. | ||
| Divergent | Divergent beam sensors are short-range diffuse-type sensors without any collimating lenses. This makes the presentation angle of the target less critical. This is important for mirror-like or specular objects, where a collimated beam from a standard diffuse sensor may reflect off a non-parallel surface and may thus not be detected. This type can also be used for short-range sensing of targets with small profiles such as wire or yarn. | ||
| Convergent | Convergent, fixed focus, or fixed distance. Optics (such as lenses) are used to focus the emitter beam at a fixed distance from the sensor. Another lens may be used to focus the field of view of the receiver on exactly the same spot. This allows for good sensitivity but limited depth of detection. The high sensitivity of this style makes it suitable for uses such as detection of transparent objects. | ||
| Fixed Field Background Suppression | Fixed-field sensors are designed to have a distance limit beyond which they will not detect objects, no matter how reflective. This is done with an emitter and two detectors, whose light detection is compared. Sensor output is canceled when light detection by one detector surpasses the other. The field distance is typically factory set per application specifications. | ||
| Adjustable Field Background Suppression | Adjustable field sensors utilize a cutoff distance beyond which a target will not be detected, even if it is more reflective than the target. Two current outputs from the sensor are compared to indicate detection. The ratio of the two currents determines the cutoff distance and is readily adjustable, electronically or with a manual adjustment such as a potentiometer. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Fiber Optic | |||
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| Plastic | Light is supplied and returned via plastic fiber optic cables. Fiber optic cables can fit in small spaces, are not susceptible to electrical noise, and exhibit no danger of sparking or shorting. Plastic fiber can be cut to length in the field and can be flexible enough to accommodate various routing configurations. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Beam | |||
| Your choices are... | |||
| Visible | The beam of the sensor is in the visible light spectrum range (380 - 750nm wavelength) | ||
| Infrared | The beam of the sensor is in the infrared light spectrum range (750 - 1000nm wavelength) | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Mode | |||
| Your choices are... | |||
| Light-on | Output is "high" or on as long as light is detected. | ||
| Dark-on | Output is "high" or on as long as no light is detected. | ||
| Light/Dark Programmable | Light or dark activation is programmable or switch selectable. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Electrical
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| Output | |||
| Your choices are... | |||
| Voltage | Output voltage is a simple (usually linear) function of the measurement. | ||
| Current | Often called a transmitter. A current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. Useful when sending signals long distances. | ||
| Frequency | The output signal is encoded via amplitude modulation (AM), frequency modulation (FM), or some other modulation scheme, but the signal is still analog in nature. | ||
| Resistance | An output consisting of a simple change in resistance is typically for a magnetoresistive device. | ||
| Switched / Alarm | An "output" of a change in state of switches or alarms | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Load | |||
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| AC Load | Output is an alternating current switched value. | ||
| DC Load | Output is a direct current switched value. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| DC Load | |||
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| 2-Wire | 2-Wire DC circuitry typically includes a diode bridge in series with the sensor, allowing functionality either as NPN or PNP in a DC circuit. Acceptable values of leakage current must be evaluated in this type of circuit. | ||
| 3-Wire NPN | Transistor output that switches the common or negative voltage to the load; the load is connected between the sensor output and positive voltage supply; also referred to as sinking type. | ||
| 3-Wire PNP | Transistor output that switches the positive voltage to the load; the load is connected between the sensor output and the voltage supply common or negative; also referred to as sourcing type. | ||
| 4-Wire NPN | Transistor output that switches the common or negative voltage to the load; the load is connected between the sensor output and positive voltage supply; also referred to as sinking type. | ||
| 4-Wire PNP | Transistor output that switches the positive voltage to the load; the load is connected between the sensor output and the voltage supply common or negative; also referred to as sourcing type. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Switch Type | |||
| Your choices are... | |||
| Normally Open | Switch is 'open' until an object is detected. | ||
| Normally Closed | Switch is 'closed' until an object is detected. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Interface | |||
| Your choices are... | |||
| Serial | A standard digital output protocol (serial) such as RS232, etc. | ||
| Parallel | A standard digital output protocol (parallel) such as IEEE488, etc. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Body Shape
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| Body | |||
| Your choices are... | |||
| Cylindrical | The shape of the potentiometer body is shaped like a cylinder/barrel. | ||
| Rectangular | The shape of the potentiometer body is square or rectangular. | ||
| Ring | A round or "doughnut" shaped sensor, where object passes through center of ring. | ||
| Slot | Designed to detect the presence of a vane or tab as it passes through a sensing slot, or "U" channel. | ||
| Other | The body shape is other/specialty. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Threaded Barrel | |||
| Your choices are... | |||
| Threaded Barrel | Body exterior is threaded; often comes with mating nuts for panel mounting. | ||
| Search Logic: | Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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