QS30FF200Q BANNER ENGINEERING, QS30FF200Q Datasheet - Page 3

Photoelectric Sensor

QS30FF200Q

Manufacturer Part Number
QS30FF200Q
Description
Photoelectric Sensor
Manufacturer
BANNER ENGINEERING
Datasheet

Specifications of QS30FF200Q

Output Current
100mA
Sensor Output
NPN/PNP
Supply Voltage Range Dc
10V To 30V
Sensor Housing
Rectangular
Sensor Input
Optical
Body Material
ABS
Supply Voltage Max
30VDC
Sensing Range Max
200mm
Banner Engineering Corp.
www.bannerengineering.com • Tel: 763.544.3164
Minneapolis, MN U.S.A.
Color Sensitivity
The effects of object reflectivity on cutoff distance, though small, may be important
for some applications. 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. This behavior is known as color sensitivity.
For example, an excess gain of 1 (see page 5) for an object that reflects 1/10 as much
light as the 90% white card is represented by the horizontal graph line at excess gain
= 10. This line intersects the curve at approximately 190 mm. Thus, an object of this
reflectivity results in a far limit cutoff of approximately 190 mm (7.5") for the 200 mm
cutoff model, for example; and 190 mm represents the cutoff for this sensor and target.
The excess gain curves on page 5 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 proportionately more excess gain in order to be sensed
with the same reliability as more reflective objects. When sensing an object of very
low reflectivity, it may be especially important to sense it at or near the distance of
maximum excess gain.
Figure 3. Reflective background – problem
Figure 5. Object beyond cutoff – problem
R1 = Near Detector
R2 = Far Detector
E
A reflective background object in this position or
moving across the sensor face in this axis and
direction may cause false sensor response.
QS30FF
QS30FF
= Emitter
R1 = Near Detector
R2 = Far Detector
E
= Emitter
R1
R2
R2
R1
E
E
Core of
Emitted
Beam
Sensing
Sensing
Fixed
Field
Fixed
Field
WORLD-BEAM
Strong
Direct
Reflection
to R1
Cutoff
Distance
Distance
Cutoff
Moving Object
Background
Reflective
Reflective
Background
or
Figure 4. Reflective background – solution
Figure 6. Object beyond cutoff – solution
A reflective background object in this position or
moving across the sensor face in this axis will be
ignored.
®
QS30FF
R1 = Near Detector
R2 = Far Detector
E
QS30 – DC Voltage
= Emitter
R2
R1
E
Core of
Emitted
Beam
Fixed Sensing
Field
P/N 119165 rev. A
Cutoff
Distance
Strong
Direct
Reflection
Away
From Sensor
Reflective
Background
3

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