Banner Q4XTBLAF300-Q8 - 5 Additional Information; 5.1 Dual (Intensity + Distance) Mode

5 Additional Information
5.1 Dual (Intensity + Distance) Mode
In background suppression (DYN, 1-pt, 2-pt) and foreground suppression (FGS) TEACH modes, the Q4X sensor compares
changes in the measured distance between the sensor and target to control the output state. Dual TEACH mode, dual
intensity + distance window, expands the applications the Q4X can solve by combining distance-based detection with light
intensity thresholds. In dual TEACH mode, the user teaches the Q4X a fixed reference surface, and the sensor compares
intensity and distance readings against the reference surface it was taught. After teaching the reference target, the
displayed value is calibrated to 100P, or a 100% match. When an object enters the sensor’s field of view, the degree of
consistency with the reference surface becomes lower and causes a change in sensor output.
In dual mode, you can detect when the target is present at the right distance and when it returns the right amount of
light. This is useful in error-proofing applications where you need to know not only that the part is present (distance), but
also that it is the correct part (intensity).
In dual mode, the Q4X requires a reference surface (far left). Once taught, the distance and intensity of the reference
surface are recorded and used as a baseline. A user adjustable switching threshold is set, and changes in distance and/or
intensity outside the switching threshold creates a sensor output change. The example above uses a 90% (90P) match
condition with a 10% change in intensity and/or distance from the reference surface required to change the output state.
The default-switching threshold is a 75% match to the reference condition (75P); this sets the threshold 25% from the
distance and intensity of the reference surface. A transparent object can be detected either by a change in intensity,
distance, or by a double peak reflection (far right).
Reference Condition
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Intensity
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Distance (mm)
Change in Intensity
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Output switches with intensity change
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Change in Distance
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Output switches with distance change
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Change in Distance and Intensity
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Output switches with intensity and distance change
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Reduced Intensity and/or Second Peak
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Output switches with intensity and/or second peak (Clear Object Detection)
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The Q4X sensor can be taught non-ideal reference surfaces, such as surfaces outside of the sensor’s 300 mm range, very
dark surfaces, or even empty space. These situations may enable applications requiring a long range detection but are
subject to typical diffuse mode detection challenges.
5.2 Dual Mode Reference Surface Considerations
Optimize reliable detection by applying these principals when selecting your reference surface, positioning your sensor
relative to the reference surface, and presenting your target. The robust detection capabilities of the Q4X allows successful
detection even under non-ideal conditions in many cases. Typical reference surfaces are metal machine frames, conveyor
side rails, or mounted plastic targets. Contact Banner Engineering if you require assistance setting up a stable reference
surface in your application.
1. Select a reference surface with these characteristics where possible:
•
Matte or diffuse surface finish
• Fixed surface with no vibration
• Dry surface with no build-up of oil, water, or dust
2. Position the reference surface between
• 50 mm and 300 mm for 300 mm threaded barrel models
• 50 mm and 100 mm for 100 mm threaded barrel models
• 60 mm and 310 mm for 310 mm flush mount models
• 60 mm and 110 mm for 110 mm flush mount models
3. Position the target to be detected as close to the sensor as possible, and as far away from the reference surface as
possible.
4. Angle the sensing beam relative to the target and relative to the reference surface 10 degrees or more.
Q4X Stainless Steel Laser Sensor
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