Long Distance Reflective Switch
OPB720A and OPB720B Series
Features:
• 0.04” to 12” (1 mm to 305 mm) with 90% reflecꢁve material. (Typical
Maximum detecꢁon distance to be set at factory)
• Recognizes objects as small as 0.08” (2 mm)
• Ambient light rejecꢁon < 100K Lux
• Open collector output
• Cable length 39” (990 mm) lead length 28 AWG wire
Description:
The OPB720A and OPB720B Series reflecꢁve switches detects objects as far away as 12” (305 mm) using standard 90%
reflecꢁve material, and can detect objects as small as 0.08” (2 mm). The OPB720 series consist of three standard reflecꢁve
switching distances -06Z for typically 6” (152 mm), -12Z for typically 12” (305 mm) and -30VZ for typically 30” (762 mm). The
power supply voltage range of the OPB720A series is 10 to 30 volts while the power supply voltage range for the OPB720B
is 4 to 7 volts.
The OPB720A and OPB720B sensors are NOT affected by ambient light in most condiꢁons. Ambient light condiꢁons are
compensated by using a synchronous driver detecꢁon scheme.
This sensor has a logical output that switches from a high level with reflecꢁve target to a low level with no reflecꢁve target.
With the addiꢁon of hysteresis, the OPB720 series minimizes output switching oscillaꢁons. The type of material used for the
target is very dependent on the distance that can be achieved for the sensor. Taking this into consideraꢁon, the OPB720
series can be used in either a reflecꢁve or interrupꢁve mode. As an example, the OPB720A-12Z can easily be used in a
reflecꢁve mode for distances around 12” (305 mm) while when reflecꢁng off a retro-reflecꢁve target similar to 3M 3870 or
Nippon Crystallite at distances around 85” (216 mm) the device works well in the interrupꢁve mode. See the included charts
for typical distances with different reflecꢁve material for other versions of the OPB720 series devices.
Ordering Informaꢀon
Descripꢀon
The OPB720 series has an open collector
output transistor and power requirements are
compaꢁble with most PLCs and TTL gates.
Part Number
Maximum detecꢁon of 0.04” to 6” (1.0 mm to 152 mm)
39” (991 mm) lead length with 28 AWG wire, using white 90%
reflecꢁve paper
OPB720A-06Z
OPB720B-06Z
Applications:
• Conveyer belt package recogniꢁon
• Personnel movement recogniꢁon
• Near-focus security systems
Maximum detecꢁon of 0.04” to 12” (1.0 mm to 305 mm)
39” (991 mm) lead length with 28 AWG wire, using white 90%
reflecꢁve paper
OPB720A-12Z
OPB720B-12Z
• Hand wash and soap dispensing staꢁons
• Toilet and urinal sensors
• Product dispensing systems
OPB720A-30VZ
Obsolete
OPB720B-30VZ
Maximum detecꢁon of 0.04” to 30” (1.0 mm to 762 mm)
39” (991 mm) lead length with 28 AWG wire, using white 90%
reflecꢁve paper
Vcc
OPB720B-30VZ ONLY
Addiꢁonal laser safety informaꢁon can be found
on the Optek website. See applicaꢁon #221.
Classificaꢁon is not marked on the device due to
space limitaꢁons. See package outline for cen-
terline of opꢁcal radiance. Operaꢁng devices
beyond maximum raꢁng may cause devices to
exceed rated classificaꢁon.
Electronics
Output
Ground
RoHS
General Note
TT Electronics | OPTEK Technology
2900 E. Plano Pkwy, Plano, TX 75074 | Ph: +1 972 323 2200
www.ꢀelectronics.com | sensors@ꢀelectronics.com
TT Electronics reserves the right to make changes in product specificaꢁon without
noꢁce or liability. All informaꢁon is subject to TT Electronics’ own data and is
considered accurate at ꢁme of going to print.
Rev H 06/2022 Page 1
© TT electronics plc
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