SD OPTICAL SWITCH OPERATION MANUAL
WIRING
APPLICATION EXAMPLE
NPN output
OPERACTION PRINCIPLE
Alarm LED
Infrared
Emitter
Infrared
Receiver
The optical switch is designed by the principle of Snell's law, when light moves from a
RY
LOAD
Black
Blue
medium of a given refractive index n1 into a second medium with refractive index n2,
both reflection and refraction of the light may occur. An incident light ray strikes at point
on the interface between two media of refractive indices n1 and n2. Total internal
reflection is an optical phenomenon that happens when a ray of light strikes a medium
boundary at an angle larger than a particular critical angle with respect to the normal to
the surface. If the refractive index is lower on the other side of the boundary, no light can
Liquid Level Control:
In Fig.4(a) , two optical switches are installed individually
in upper and lower level of the tank. When liquid rises to
cover the upper optical switch, it will stop fill in liquid.
When liquid drops down and lower optical switch is not
covered by liquid, it will start filling up. Liquid has to be
maintained in between upper and lower optical switches.
Brown
DC POWER
10~28V
PNP output
Alarm LED
Brown
Black
Dry
Total Internal Reflection
LOAD
RY
Motor Protection:
In Fig.4(b) , optical switch is installed in lower level of the
tank to prevent pump burning caused by the lack of
water/liquid.
DC POWER
10~28V
Blue
Fig.1
pass through and all of the light is reflected. When light crosses a boundary between
materials with different refractive indices, the light beam will be partially refracted at the
boundary surface, and partially reflected.
Optical switch operates by sensing the difference of refraction index between various
mediums, which causes different degree of refraction and penetration. When the liquid
is in empty, the transmitted light is reflected back to the receiver. When the liquid flow
in, part of the transmitted light would be reflected back to the receiver and most of ray
emitted into the liquid. The received senses the signal loss and switches accordingly.
*Avoid to install it near the corner region.
M12x1
Infrared
Emitter
Infrared
Receiver
NPN output
4 Black
2
Wetted In Liquid
Infrared penetrate the cone
Fig.2
Auto Pump Up/Down
Motor protection
Location Control
FILL
1 Brown
NPN
3
LOAD
RY
DC POWER
10~28V
Chemical
Liquid
1
PNP output
5D
D
1 Brown
FEATURE
1. NPN, PNP open collector output to energize
relay or PLC.
2. Housing material of PC, Polysulfone, SUS304, SUS316
for acidity and alkaline; applicable in water, oil, liquid
solution, liquor, alcohol....etc.
3. Over-current and reverse polarity protected
4. LED Status indication.
4
Connector
Diagram
DIMENSION
PC or Polysulfone
E10.5
Flow
Out
Pump
LOAD
RY
Flow
Out
DC POWER
10~28V
Pump
Fig.4(b)
Fig.4(a)
3 Blue
Fig.3
CAUTION
7.6
Hex19
In installation (Fig.5), use o-ring in the bottom of the thread and tape seal around the thread
then screw to the tank wall.
Maximum torque for installation:100kgf-cm (SUS304/SUS316), 50kgf-cm (PC/Polysulfone)
Power supply is 10~28Vdc. Color code: Brown for positive and blue for negative terminal.
Optical switch is not recommended for operating in emulsion and phase-change liquids.
Do not install sensor close to infrared sources.
Tip of the optical sensor must be free at least 30mm from any reflective surfaces or other
interferences. Like the tank wall (Fig.5.)
Do not install the sensor in a stagnation point of the liquid.
The sensor installed a thread casing when the sensor tip must be exposed.
This product is not recommended for organic solution especially for viscous liquid which
easy to stick on the optical surface
25
46.5
PC or Polysulfone
G3/8"
E10.5
SPECIFICATION
1. Housing Material: PC, Polysulphone or SUS304, SUS316
Sensible Tip Material: Polysulphone for SUS304 and SUS316
2. Protection Rating : IP68
3. Operation Temperature: -10~125BC
4. Ambient Temperature: -10~80BC
5. Operation Pressure:
Max.10kg/cm2(PC,Polysulfone)
Max.40kg/cm2(SUS304/316)
6. Power Supply: 10~28 Vdc with reverse charge protection
7. Load Current: 100mA Max.
8. Overload Current Protection: 100mA
9. Connection Thread:
M12 x 1 or 3/8"G(PF)
3/8"NPT (SUS304, SUS316 only)
1/2"G (SD204BR99-A only)
10. Lead Wire:
2m CABLE(dia. 3.8) 3C PVC 24 AWG;
custom made if over 2m
4 Black
PNP
M12*P1.0
Motor
control
Control
Equipment
3 Blue
10
Hex22
SUS304 or SUS316
25
49
G3/8"
keep out area
³30mm
O-RING
Fig.5
E10.5
REGULAR MAINTENANCE
Please clean the top part of optical switch with clean water regularly.
Please do not use organic solution or scrub while washing to avoid scratches on the surface.
15.5
Hex19
24.5
ORDERING INFORMATION
46.3
SUS304 or SUS316
SD 20
-A
Housing Material
3/8"NPT
P: PC G:Polysulfone 4:SUS304 6:SUS316
E10.5
Connection Thread
M2: M12x1.0(PC, Polysulfone )
AU: 3/8"NPT(SUS304, SUS316)
15.5
Hex19
AR: 3/8"G
BR: 1/2"G (SD204BR99-A)
Output Form
24.5
P0:PNP N.C
46.3
P1:PNP N.O
NO: Wet, In Liquid
SUS304(M12x1)
Connector
E10.5
N0:NPN N.C
N1:NPN N.O
NC: Out of Liquid
A: M12x1 (SD204BR99-A)
G 1/2"
M12XP1
Hex24
38.5
17.5
65
15.5
87
Aplus Finetek Sensor, Inc.
355 S. Lemon Ave, Suite D, Walnut, CA 91789
Tel : 1 909 598 2488; 1 909 598 0688 Fax : 1 909 598 3188
Email: [email protected]
http://www.aplusfine.com
08-SD20-B4-EM,05/01/2012