Banner VALU-BEAM Series - Manual (Page 12)

The amount of light that is returned to reflective mode sensors (diffuse,
convergent, and divergent types) is dramatically influenced by the reflectivity
of the surface being sensed. Excess gain curves are plotted using a white test
card, rated at 90% reflectance. Any other material surface may be ranked for
its reflectivity as compared against this 90% reflectance white test card:
MATERIAL REFLECTIVITY EXCESS GAIN REQUIRED
*NOTE: for materials with shiny or glossy surfaces, the reflectivity figure represents the
maximum light return, with the sensor beam exactly perpendicular to the material surface.
These sensors operate by detecting the reflection of their own light from
the object being sensed, and therefore require no special reflectors. They
are ideal for use when the reflectivity and profile of the object are sufficient
to return a large amount of emitted light back to the sensor. Choose "DSR"
models for best response to objects at close range.
CONVERGENT Mode
VALU-BEAM convergent sensors produce a precise .06" diameter sens-
ing spot at a focus point 1.5" in front of the sensor lens. Due to their very
narrow depth of field, they excel at detecting small objects only a fraction
of an inch away from backgrounds. A visible red sensing beam simplifies
alignment.
SMW915DSR
Voltage: 12 to 28V ac/dc
SMA915DSR
Voltage: 90 to 130V ac
SMB915DSR
Voltage: 210 to 250V ac
Range: 15 inches (38cm)
Response: 20ms on/off
Beam: infrared, 880nm
SMW915CV
Voltage: 12 to 28V ac/dc
SMA915CV
Voltage: 90 to 130V ac
SMB915CV
Voltage: 210 to 250V ac
Focus at 1.5" (38mm)
Response: 20ms on/off
Beam: visible red, 650nm
90%
80%
55%
47%
35%
70%
70% Kodak white test card
White paper
Newspaper with print
Tissue paper: 2 ply
1 ply
Kraft paper cardboard
Beer foam
1
1.1
1.6
1.9
2.6
1.3
1.3
Dimension lumber (pine,
clean, dry)
Rough wood pallet
(clean)
*Clear plastic
*Opaque white plastic
*Opaque black plastic
Black neoprene
Black rubber tire wall
*Aluminum, unfinished
*Aluminum, black
anodized
*Stainless steel,
microfinish 75%
20%
40%
87%
14%
4%
1.5%
140%
115%
400%
1.2
4.5
2.3
1.0
6.4
22.5
60
0.6
0.8
0.2
MATERIAL REFLECTIVITY EXCESS GAIN REQUIRED
1000
100
10
1
.1 IN 1 IN 10 IN 100 IN
DISTANCE
(Range based on 90%
reflectance white test card)
SMW915D, SMA915D,
SMB915D
E
X
C
E
S
S
G
A
I
N
I
1000
100
10
1
.1 IN 1 IN 10 IN 100 IN
DISTANCE
Range base on 90%
reflectance white test card
SMW915DSR,
SMA915DSR,
SMB915DSR
E
X
C
E
S
S
G
A
I
N
I
1000
100
10
1
.1 IN 1 IN 10 IN 100 IN
DISTANCE
SMW915CV,
SMA915CV,
SMB915CV
(Range based on 90%
reflectance white test
card)
E
X
C
E
S
S
G
A
I
N
I
6 12 18 24 30 0
0
.25
.50
.75
.25
.50
.75
I
N
C
H
E
S
DISTANCE TO 90% WHITE TEST CARD--INCHES
SMW915D,
SMA915D,
SMB915D
3 6 9 12 15 0
0
.25
.50
.75
.25
.50
.75
I
N
C
H
E
S
DISTANCE TO 90% WHITE TEST CARD--INCHES
SMW915DSR,
SMA915DSR,
SMB915DSR
.5 0
0
.03
.06
.09
.03
.06
.09
1.0 1.5 2.0 2.5
I
N
C
H
E
S
DISTANCE TO 90% WHITE TEST CARD--INCHES
SMW915CV, SMA915CV,
SMB915CV
Application Note:
Relative Reflectivity of Materials
Models Excess Gain Beam Pattern Sensing Mode
SMA915D
Voltage: 90 to 130V ac
SMB915D
Voltage: 210 to 250V ac
Range: 30 inches (76cm)
Response: 20ms on/off
Beam: infrared, 880nm
SMW915D
Voltage: 12 to 28V ac/dc
DIFFUSE Mode
OBJECT
OBJECT
VALU-BEAM 915 Series Sensors
12