OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com Issue A.3 01/06
Page 1 of 4
Tube Liquid Sensor
OPB350 Series
Applications:
• Non-contact fluid sensing
• IV fluid
• Oils and other petroleum products
• Colored fluids
• Toner fluids
• Water
Ordering Information
Part Number LED Peak Sensor Tube Size Lead Length / Spacing
OPB350
890 nm Transistor
0.125"
0.330” / 0.320”
OPB350L187 0.188"
OPB350L250 0.250"
OPB350W187Z 0.188"
OPB350W250Z 0.250" 24" / 26 AWG Wire
Features:
• Can identify if liquid is pres ent in clear tubes that ha ve an
outside diameter of 1/8" (3.2mm), 3/16" (4.8mm) or 1/4" (6.3mm)
• Opaque plastic housing enhances ambient light rejection
• Printed circ uit bo ar d mo unti ng or 24 ” (610 mm) wir es
Description:
The OPB350 series liquid sensor is designed to work with 1/8” (3.2mm), 3/16” (4.8mm) and 1/4” (6.3mm) outside
diameter clear tubes. When output reference circuitry is added, multiple output states such as “fluid present,” “no
fluid present” and “no tube present” can be recognized.
Clear liquid pr e sen t ca uses the phototransistor to sink the maximum current, while dark liquid present causes it to
sink the minimum current. As bubbles pass through the tube, the signal will vary between the “liquid present” and
“no liquid” states. If no liquid is present, the phototransistor sinks only a small amount of current. If no tube is
present, the phototransistor sinks a larger current than in the “no liquid” state.
Smaller outside diameter tubes can be used wh en the tube is sized up to one of the standard sizes and is fitted
properly in th e housing opening. For example, fluid in a 1/16” (1.6mm) outside diameter tube can be sensed
when a piece of tubing with a 1/8” (3.2mm) outside diameter and a 1/16” (1 .6mm) inside diameter is used as an
adapter.
Product Photo Here
Opto Switch
C1=0.1 uf
R4=2K
R1=1K
LM393
or
LM339
LM393
or
LM339
R2=2K
R3=750
Vcc
Gnd
Vcc
Vth
Vth
Vth
Gnd
Vth
R1=500
R4=2.5K
C1=0.1 uf
1
1
2
2
Output
Output
1
2
Typical Application Circuit
4 OPB350
“N”
Package
“T”
Package
RoHS
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.3 01/06
Page 2 of 4
Tube Liquid Sensor
OPB350 Series
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
1
2
3
4
1
2
3
4
Pin # LED Pin # Transistor
Red Anode White Collector
Black Cathode Green Emitter
OPB350W187Z and OPB350W250Z
OPB350L187 and OPB3 50L250
OPB350 Pin # LED Pin # Transistor
1 Anode 3 Collector
2 Cathode 4 Emitter
Red-1
Black-2
White-3
Green-4
Pin # LED Pin # Transistor
1 Anode 3 Collector
2 Cathode 4 Emitter
Dot
Dot
Dot
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com Issue A.3 01/06
Page 3 of 4
Tube Liquid Sensor
OPB350 Series
Notes:
(1) All parameters tested using pulse technique.
(2) RMA flux is recommended. Duration can be extended to 10 seconds maximum when flow soldering.
(3) Methanol or isopropanol are recommended as cleaning agents. The plastic housing is soluble in chlorinated hydrocarbons and
keytones.
(4) Derate linearly 1.33 mW/° C above 25° C.
(5) Ee(APT) is a measurement of the average apertured radiant energy incide nt upon a sensing area 0.250” (6.350 mm) in diameter,
which is perpendicular to and centered to the mechanical axis of the emitting surface at a distance of 0.466” (11.837 mm).
E
e(APT) is not necessarily uniform within the measured area.
Absolut e Maxi mum Ratings (TA=25°C unless otherwise noted)
Storage Temperature -40° C to +100° C
Operating Tempera t ur e -40° C to +85° C
Lead Soldering Tempera t ure [1/16 inch (1.6mm) from the case for 5 sec. with soldering iron] (2) 260° C
LED
Forward DC Current 50 mA
Peak Forward Current (2 µs pulse width, 0.1% duty cycle) 1 A
Reverse DC Voltage 2 V
Power Dissipation 100 mW
Output Phototransistor
Collector-Emitter Voltage 25 or 30 V
Collector DC Current 50 mA
Power Dissipation 100 mW
Electrical Characteristics (TA = 25°C unless otherwise noted)
SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS
Input LED (See OPB245 for additional informati on — for reference only)
VF Forward Voltage - - 1.8 V IF = 20 mA
IR Reverse Current - - 100 µA VR = 2.0 V
Output Phototransistor (See OPB555 [PB350] & OP750 [-187 & -250] for additional information — for reference only)
V(BR)CEO Collector-Emitter OPB350
Breakdown Voltage -187 & -250 30
25 -
- -
- V IC = 100 µA, EE = 0 mw/cm2
ICEO Collector-Emitter Dark Current - - 100 nA VCE = 10 V, IF = 0, EE = 0 mw/cm2
Coupled (Tested using clear 0.125” O.D., 0.062 I.D. n ylon tub ing)
VCE(SAT) Collector-Emitter Saturation Voltage - - 0.4 V IC = 100 µA, IF = 5 mA
IC(ON)
On-State Collector Current
OPB350
OPB350L187 & OPB350W187
OPB350L250 & OPB350W250
1
1
0.75
3.5
2
1.5
6
4
3
mA
mA
mA
VCE = 0.4 V, IF = 5 mA
VCE = 0.4 V, IF = 5 mA
VCE = 0.4 V, IF = 5 mA
On/Off
Ratio
OPB350
OPB350L187 & OPB350W187
OPB350L250 & OPB350W250
-
-
-
3
2.3
2.3
-
-
-
-
-
-
VCE = 0.4 V, IF = 5 mA , I.D.=0.0625”
VCE = 0.4 V, IF = 5 mA , I.D.=0.0870”
VCE = 0.4 V, IF = 5 mA , I.D.=0.1250”
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.3 01/06
Page 4 of 4
Tube Liquid Sensor
OPB350 Series
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
()
0.0
0.2
0.4
0.6
0.8
1.0
1.2
-40 -20 0 20 40 60 80 100
Relative I
C(ON)
Normalized @ T=20°C
Normalized IC(ON) vs Te mpera ture
Temperature (°C)
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
-40-200 20406080100
V
SAT
(V o lts)
Normalized @ I
F
= 5mA, I
CE
= 100uA
Temperature (°C)
Typical VSAT vs Temperature
0
50
100
150
200
250
300
12345678910
Rise & Fall Time ( usec )
Fall
Rise
VR2 = 1.0
Rise & Fall Time vs Load Resistance
Load Resistance (,000 Ohms)
Test Circuit (Rise & Fall Time)
