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 C.1 03/09
Page 1 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
Features:
• Can identify if liquid is present in clear tubes that have an
outside diameter of 1/16” [1.6mm], 1/8" [3.2mm], 3/16" [4.8 mm]
or 1/4" [6.3 mm]
• Opaque plastic housing enhances ambient light rejection
• Printed circuit board mounting or 24” (610 mm) 26 AWG wires
Description:
The OPB350 series liquid sensor is designed to work with 1/16” [1.6mm] 1/8” [3.2mm], 3/16” [4.8 mm] and
1/4” [6.3 mm] 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 present causes 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 tube is present, the phototransistor sinks current between the dark fluid and clear Fluid
states. The customer will have to identify the typical current values for each situation. The ratio between the
different states allows acknowledgement of different conditions.
The OPB350L series have leads that are designed to mount directly to PCBoards. The OPB350W series with 26
AWG wires are remote mountable. The OCB350 series provides a full solution with automatic calibration
capability and a preset trip level.
The OCB350 series is configured to optimize the design effort needed to use a fluid sensor with the addition of
self calibration circuitry. The OCB350 series are easy to use requiring only an optical device and power supply.
Four lights are provided on the board that acknowledge when the device is calibrated (Green LED), that the
device could not be calibrated (Red LED) and when the analog output has reached the logical trip higher than the
calibration point (Blue LED) or lower than the calibration point (Green LED). The internal phototransistor load
resistance can be set for three different values (~2.5K, ~9.6K or ~27K Ohms). A Reset/Clear pin is provided for
remote signaling to calibrate of the system.
The OCB350 series comes with an OPB350L_ _ _Z, PCBoard, interface cable (OCB100-MC24) and all the
necessary electronics required for sensing either transmissive or opaque fluids.
See “Theory of Operation” for detailed information.
For a custom PCBoard design for your unique challenge, contact your OPTEK representative.
Product Photo Here
“T”
Package
RoHS
Applications:
• Non-contact fluid sensing
• IV fluid
• Oils and other petroleum products
• Colored fluids
• Toner fluids
• Water
“N”
Package “C”
Package
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 C.1 03/09
Page 2 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
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 key-
tones.
(4) Derate linearly 1.33 mW/° C above 25° C.
(5) Ee(APT) is a measurement of the average apertured radiant energy incident 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.
(6) The on/off ratio is referenced to the I.D. as specified for a clear PVC tube with O.D. per the device dimensions. The ratio is calculated
by the IC(ON) when the tube is filled with water divided by the IC(ON) with an empty tube.
OPB350 PCB mount for 1/8” tubing
OPB350L062 PCB mount for 1/16” tubing
OPB350W062Z Wired assembly for 1/16” tubing, with mounting tabs
OPB350L125 PCB mount for 1/8” tubing
OPB350C125Z Wired assembly for 1/8” tubing, mounting tabs & Molex connector 50-57-9404
OPB350W125Z Wired assembly for 1/8” tubing, with mounting tabs
OPB350L187 PCB mount for 3/16” tubing
OPB350W187Z Wired assembly for 3/16” tubing, with mounting tabs
OPB350L250 PCB mount for 1/4” tubing
OPB350W250Z Wired assembly for 1/4” tubing, with mounting tabs
OCB350L062Z OPB350L062 mounted on OCB100AZ calibration circuit board, with OCB-MC24 cable
OCB350L125Z OPB350L125 mounted on OCB100AZ calibration circuit board, with OCB-MC24 cable
OCB350L187Z OPB350L187 mounted on OCB100AZ calibration circuit board, with OCB-MC24 cable
OCB350L250Z OPB350L250 mounted on OCB100AZ calibration circuit board, with OCB-MC24 cable
COMPLETE PART NUMBERS OF OPB350 AND OCB350 SERIES
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 C.1 03/09
Page 3 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Storage Temperature -40° C to +100° C
Operating Temperature -40° C to +85° C
Lead Soldering Temperature [1/16 inch (1.6 mm) 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 24 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 information — for reference only)
VF Forward Voltage - - 1.7 V IF = 20 mA
IR Reverse Current - - 100 µA VR = 2.0 V
Output Phototransistor (See OP555 [OPB350] & OP750 [-062, -125, -187 & -250] for additional information— for Ref. Only)
V(BR)CEO Collector-Emitter OPB350
Breakdown Voltage -062, -187 & -250
30
24
-
-
-
- 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
VCE(SAT) Collector-Emitter Saturation Voltage - - 0.4 V IC = 100 μA, IF = 5 mA
IC(ON)
On-State Collector Current
OPB350L062 & OPB350W062Z
OPB350
OPB350L125 & OPB350W125Z
OPB350L187 & OPB350W187Z
OPB350L250 & OPB350W250Z
0.30
1.00
1.30
1.00
0.75
0.8
3.5
2.6
2.0
1.5
1.3
6.0
3.9
4.0
3.0
mA VCE = 0.4 V, IF = 5 mA
On/Off
Ratio
OPB350L062 & OPB350W062Z
OPB350
OPB350L125 & OPB350W125
OPB350L187 & OPB350W187
OPB350L250 & OPB350W250
-
-
-
-
-
3.0
3.0
2.5
2.3
2.3
-
-
-
-
-
-
VCE = 0.4 V, IF = 5 mA , I.D.=0.0312”(6)
VCE = 0.4 V, IF = 5 mA , I.D.=0.0625”(6)
VCE = 0.4 V, IF = 5 mA , I.D.=0.0870”(6)
VCE = 0.4 V, IF = 5 mA , I.D.=0.1250”(6)
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 C.1 03/09
Page 4 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
1
2
4
3
Pin LED Pin # Transistor
1 Anode 4 Emitter
2 Cathode 3 Collector
OPB350L187 and OPB35 0L250
OPB350W187Z and OPB350W250Z
INCHES
[ MILLIMETERS]
DIMENSIONS ARE IN:
Dot
Dot
OPB350L062 & OPB350W062Z
OPB350L125 & OPB350W125Z
Dot
OPB350
Solder pad Information
4X o
.020 [0.51]
4X .125 MIN.
0.313 [7.94]
0.110 [2.79]
Ø0.125 [Ø3.17]
0.474 [12.04]
Ø0.063 [Ø1.59]
0.056 [1.42]
0.150 [3.81]
2X Ø0.125 [Ø3.18]
1.165 [29.59]
0.895 [22.73]
0.448 [11.37]
0.020 [0.51]
0.625 [15.88]
60°
0.100 [2.54]
0.110 [2.79]
4X 24.00" MIN
0.525 [13.34]
0.300 [7.62]
Cathode
Anode
Collector
Emitter
Emitter
Collector
Anode
Cathode
0.300 [7.62]
0.625 [15.88]
0.100 [2.55]
White Dot to
Identify LED
Anode Lead
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 C.1 03/09
Page 5 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
J1—Pin # 1
Pin # Function
1 Vcc
2 Logic Out A
3 Logic Out B
4 Calibrate
5 Analog Out
6 Ground
Color
Red
Orange
Blue
Green
White
Black
J-1 OCB100-MC24
Shorting Bar Position Load
Resistance
3 2 1
~27 KΩ
~9.6 KΩ
~2.5 KΩ
OCB-MC24
AWG = 28 Length = 24” [610mm]
±0.02
OCB350
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 C.1 03/09
Page 6 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Calibration Circuit theory of operation:
The OCB350 series is designed to minimize the change of optical devices due to manufacturing variance. With the calibration
circuit, the design engineer can narrow the initial o utput state providing a device that will operate the same for years with the
same startup state thus enhancing the reliability and consistence of the system. Degradation of the LED or phototransistor is
compensated for each time the system is calibrated allowing the system to provide a known, consistent output level resulting
in years of consistent quality. The OCB350 series are designed to maintain the calibrated setting even if power is lost. This
allows faster startup without the need for calibration every time the device is initiated. The designer can initiate the calibration
procedure at any time by momentarily grounding J1-Pin-4 (green wire). This allows the device to be remotely calibrated then
mounted in the equipment.
The PCBoard has a set of shorting pins allowing the user to change the phototransistor load resistor. By arranging the
shorting bar to the appropriate location (see table), the load resistance can be changed from approximately 2.5K to 27 K Ω.
Increasing the load resistor increases the sensitivity of the device.
When the “Calibrate” pin (#4) is momentarily grounded, the system begins its calibration process and raises the current
through the LED, from 0 mA to 14 mA, until the phototransistor reaches the preset calibration point. A green calibration light
will blink during the initiation and will stop when the preset phototransistor output level is reached. At this time, the LED
drive current is locked and maintained until Reset/Clear pin is momentarily grounded. If for some reason, the LED drive
current reaches the maximum allowable value, a RED warning light will be turned on. During the calibration process, remote
monitoring of J1-Pin3 allows the designer to ensure the system is calibrated (this output should be at the preset calibrated
output level when the calibration procedure is completed). The phototransistor load resistor may need to be adjusted to allow
the system to calibrate properly.
After the calibration process is complete, the device is ready for acknowledgement of a change in the signal. The design
engineer can monitor either the Analog Output (J1-Pin 5) or Logical Output (J1-Pin 2 or J1-Pin 3).
The Logical output will change state on ce the preset optical light condition is reach e d. The “Logic Out A” switches when the
optical signal increases above approximately 2/3 of VCC while “Logic Out B” switches when the optical signal decreases
below approximately 1/3 of VCC.
As with all optical devices, the switching condition is consistent with the phototransistor receiving a preset light level. This
switching position and light level may vary dependent on several possible factors such as:
• Ambient light variation ((reduced or eliminated with periodic recalibration)
• LED and phototransistor pair degradation (eliminated with periodic recalibration)
• Contamination in front of either the LED or phototransistor (reduced or eliminated with periodic cleaning)
• System power variation (reduced or eliminated with periodic recalibration)
• Temperature changes (reduced or eliminated with periodic recalibration)
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 C.1 03/09
Page 7 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
Schematic for OCB100 PCBoard
OCB100-MC24
Symbol Parameter Min Max Units Conditions
ICC Supply Current - 35 mA Vcc = 5.0 Volts
VOL Low Level Output Voltage(1) - 1.2 V Vcc = 5.0 Volts, VOUT < 2.2 Volts
VOH High Level Output Voltage(1) 3.5 - V Vcc = 5.0 Volts, VOUT > 2.8 Volts
Electrical Characteristics OCB350 Series (TA = 25°C unless otherwise noted)
VCC Supply Voltage 4.75 5.25 V
Absolute Maximum Ratings OCB350 Series (TA=25°C unless otherwise noted)
Storage & Operating Temperature Range 0°C to +70°C
Lead Soldering Temperature [1/16 inch (1.6mm) from the case for 5 sec. with soldering iron] 260°C
Notes:
1. Pins 2 and 3 logic outputs only.
GP2/AN2
GP4/AN3
GP5/T1CKI GP1/AN1
GP3/MCLR
GP0/AN0
V
Vss
DD
1
5
6
2
4
7
8
3
Green
D4 D1
Red
J1 - Pin 4
C4
0.1µf
0.1µf
C1
R3
R1
R2
J1 - Pin 5
R10
R9
C3
0.1µf
Optical Device
U2
U3
LM324
U1
LM324
U1
D2
Blue
R11
J1 - Pin 3
J1 - Pin 1
J1 - Pin 6
1
2
4
5
6
Vcc
Logic Out A
Analog Out
Calibrate
Ground
J1
D3
5.6 V
R16
R7
R6 R12
C2
0.1µf
R4
R5
Logic Out B3
J1 - Pin 2
U1
LM324
R14
Green
D5
Q1
R8 R15
J2
123
R17
J1 = JST connector S6B-ZR(LF)(SN)
R13
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 C.1 03/09
Page 8 of 8
Tube Liquid Sensor
OPB350 / OCB350 Series
(Calibration Circuit Available)
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 IC(ON)
Normalized @ T=20°C
Normalized IC(ON) vs Temperature
Temperature (°C)
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
-40 -20 0 20 40 60 80 100
V
SAT
(Vo lts )
Nor maliz ed @ I
F
= 5mA, I
CE
= 100uA
Temperature (°C)
Typical VSAT vs Temperature
0
50
100
150
200
250
300
12345678910
Ri se & Fall Tim e (u sec)
Fall
Rise
VR2 = 1.0
Rise & Fall Time vs Load Resistance
Load Resistance (,000 Ohms)
Test Circuit (Rise & Fall Time)
