QS18VN6LAF250Q BANNER ENGINEERING, QS18VN6LAF250Q Datasheet - Page 4

• Manufacturer Part Number: QS18VN6LAF250Q
• Description: Photoelectric Sensor
• Manufacturer: BANNER ENGINEERING
• Series: QS18 Adjustable-Fieldr

Specifications of QS18VN6LAF250Q

• Output Current: 100mA
• Sensor Output: NPN
• Supply Voltage Range Dc: 10V To 30V
• Sensing Range Min: 0mm
• Sensor Input: Laser
• Supply Voltage Max: 30VDC
• Sensing Range Max: 20mm

WORLD-BEAM
4
Color Sensitivity
The effects of object reflectivity on cutoff distance, though small, may be im por tant for some
ap pli ca tions.
The excess gain curves on page 1 were generated using a white test card of 90% reflectance.
Objects with reflectivity of less than 90% reflect less light back to the sensor, and thus require
pro por tion ate ly more excess gain in order to be sensed with the same reliability as more
reflective objects. When sens ing an object of very low reflectivity, it may be especially im por-
tant to sense it at or near the distance of maximum excess gain.
It is expected that at any given cutoff setting, the actual cutoff distance for lower reflectance
targets will be slightly shorter than for higher reflectance targets (see Figures 9, 10, and 11).
This behavior is known as color sensitivity.
In the graphs below, the percentage of deviation indicates a change in the cutoff point for
either 18% gray or 6% black targets, relative to the cutoff point set for a 90% reflectance
white test card.
For example, in Figure 9, the cutoff point decreases 10% for a 6% reflectance black target
when the cutoff point is adjusted for 100 mm (4") using a 90% reflectance white test card. In
other words, the cutoff point for the black target is 90 mm (3.6") for this setting.
Figure 9. QS18AF cutoff point deviation
Figure 11. QS18LAF250 cutoff point deviation
P/N 66981 rev. G
-10
-12
-16
-20
-2
-4
-6
-8
0
-4
-8
0
20
50
18% Gray Card
6% Black Card
18% Gray Card
6% Black Card
Cutoff Setting in mm (90% White Card)
Cutoff Setting in mm (90% White Card)
35
100
®
QS18 Adjustable-Field Sensors
50
150
75
200
100
250
Figure 10. QS18LAF cutoff point deviation
-12
-16
-20
-4
-8
0
30
18% Gray Card
6% Black Card
Banner Engineering Corp. • Minneapolis, MN U.S.A
www.bannerengineering.com • Tel: [phone]
Cutoff Setting in mm (90% White Card)
60
90
120
150