OPB350 Datasheet, PDF (1/4 Pages) OPTEK Technologies – Tube Liquid Sensor

Tube Liquid Sensor
OPB350 Series
Features:
• Can identify if liquid is present in clear tubes that have 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 circuit board mounting or 24” (610 mm) wires
“N”
Package
Product Photo Here
“T”
Package
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 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 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 when the tube is sized up to one of the standard sizes and is fitted
properly in the 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.
Applications:
• Non-contact fluid sensing
• IV fluid
• Oils and other petroleum products
• Colored fluids
• Toner fluids
• Water
Ordering Information
Part Number
Package
LED Peak
Wavelength
Sensor
Tube
Size
OPB350
0.125"
OPB350L187
N
0.187"
OPB350L250
890 nm Transistor 0.250"
OPB350W187Z
T
OPB350W250Z
0.187"
0.250"
Lead Length /
Spacing
0.330” / 0.320”
24" / 26 AWG Wire
Typical Application Circuit
Vcc
Vth ₁
4
Vth ₂
Opto Switch
OPB350
LM339
or
LM393
Output ₁
Vth ₁
Gnd
Vcc
LM339
or
LM393
Output ₂
Vth₂
Gnd
RoHS
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: [phone] or [phone]
FAX: [phone] [e-mail] www.optekinc.com
Issue A.4 02/06
Page 1 of 4