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Business > Industrial Devices > Automation Controls Top > Service & Support > FA Technical Support > Technical Guide (FA Sensors) > Photoelectric Sensors > Precautions for prorer use
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The setting distance must be equal to or less than the specified sensing range.
The sensors may be operable at a setting distance longer than the rated sensing range, but reliable operation cannot be guaranteed. Further, in a dirty or dusty environment, the setting should provide margin for beam intensity reduction.
The sensing range given in the specifications is for the standard sensing object.
Since the actual sensing distance differs with the size, color, surface condition, etc., of the sensing object, set the sensor giving enough margin for these differences.
The bigger the sensing object size, the larger the quantity of light reflected, which increases the sensing range. |
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The above mentioned relative sensing range for different sensing objects has been given taking the sensing range for white non-glossy paper as 100. The values are given for reference, and would vary slightly with the type of photoelectric sensor, sensing object size, etc.
If sensors are mounted adjacently, they may affect each other's operation (mutual interference). The following countermeasures are necessary to prevent it.
When sensors having the interference prevention function are used, sensors can be mounted close together.
Interference prevention filters (optional) are available for CX-411□, NX5-M10RA and NX5-M10RB. |
<CX-411□> |
Find out the operating point ℓ1 on the parallel deviation diagram or the sensing field diagram for the setting distance L1. Separate sensors by 2 x ℓ1 or more.
(However, it is required that the emitter and receiver face each other and are installed in a direct line.)
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With this arrangement, if a sensing object comes near the sensors, the beam reflected from the sensing object may enter the receiver as shown below. In this case, countermeasures, such as placing a shield between the emitter and the receiver are necessary.
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Placing a shield
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If a thru-beam type sensor, or a retroreflective type sensor is mounted on a flat shiny plane, the emitted beam may not be interrupted by a sensing object because some amount of the emitted beam passes through the gap between the sensing object and the plane, gets reflected from the plane, and enters the receiver.
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Place light barriers at (A), (B) and (C) to prevent reflection.
If a reflective type sensor is mounted on a rough plane, scatteredly reflected beam returns to the sensor.
This causes the hysteresis to increase or the sensor to always remain in the light received condition.
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If there is a wall, etc., behind the sensing object, the sensor operation may be affected.
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(However, the specular background should be a plane surface, directly facing the sensor. A spherical or curved background may be detected.)
Most of the sensors use modulated beam highly immune to sunlight or ordinary fluorescent light. However, intense light or light from inverter fluorescent lamps may affect the sensor operation.
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The incident angle and wavelength of the sunlight vary depending on the seasons, time of day, or other reasons. Thus, the influence that the sunlight has on sensors changes. For this reason, make sure to confirm that a malfunction does not occur with actual sensors before use.
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Perform the beam alignment with a retroreflective type sensor, similarly. Normally, the reflector angle can be set roughly, but the sensor angle must be precisely adjusted.
Caution | : | The directional characteristics of photoelectric sensors can vary, so please be sure that you can adjust the beam axis using mounting brackets, etc. upon use. |
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Follow the procedure given below while noticing the operation indicator.
1 | : | In the light received condition, turn the sensitivity adjuster slowly and confirm the point (A) where the sensor enters the "Light" state operation. |
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2 | : | In the dark condition, turn the sensitivity adjuster further clockwise until the sensor enters the "Light" state operation and then bring it back to confirm point (B) where the sensor just returns to the "Dark" state operation. (If the sensor does not enter the "Light" state operation even when the sensitivity adjuster is turned fully clockwise, this extreme position is point (B).) |
3 | : | The position at the middle of points (A) and (B) is the optimum sensing position. (Turn the adjuster with a slot screwdriver. The adjuster may be damaged if it is turned beyond its limit with excessive force.) |
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Type | Light received condition | Dark condition | ||
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Thru-beam | Presence detection | |||
Light intensity detection | ||||
Retroreflective | Presence detection | |||
Light intensity detection | ||||
Reflective | Presence detection | |||
Mark sensing | Red beam | |||
Green beam |
For models equipped with auto sensitivity setting function, sensitivity adjustment is performed with a single touch of a button without the sensitivity adjustment described above.
Marks can be sensed with mark sensor LX-100 series or color fiber sensor FZ-10 series, mark sensor or fiber sensor.
<When the mark mode is set>
The optimal light source is automatically selected from the 3 colors of the R, G, B LEDs so that the contrast between the mark and base becomes the largest. This makes detection more stable.
<When the color mode is set>
The color mode utilizes all the R, G, B LEDs and detects the reflected light by calculating the R, G, B ratio. Thus, high precision detection is possible by sensing only the mark color that teaching was performed on.
The FZ-10 series uses red, green and blue LEDs to identify a color by its three color components. Hence, it is able to discriminate even minute color differences.
For mark sensors and fiber sensors, the color combinations of the mark and the background which can be discriminated, depending on the color of the light source, are as given in the table below.
Mark color | White | Yellow | Orange | Red | Green | Blue | Black |
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Background color | |||||||
White | - | (B) | (B) | (G)(B) | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) |
Yellow | (B) | - | (G) | (G) | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) |
Orange | (B) | (G) | - | (G)(B) | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) |
Red | (G)(B) | (G) | (G)(B) | - | (R) | (R)(B) | (R)(B) |
Green | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) | (R) | - | (B) | (B) |
Blue | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) | (R)(B) | (B) | - | (B) |
Black | (R)(G)(B) | (R)(G)(B) | (R)(G)(B) | (R)(B) | (B) | (B) | - |
(R) | : | Red LED type |
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(G) | : | Green LED type |
(B) | : | Blue LED type |
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