OPTEK OPB720A and OPB720B series long distance reflective switches can detect objects up to 12 inches (305 mm) using standard 90% reflective material, and can detect objects as small as 0.08 inches (2 mm).
The OPB720A and OPB720B series are long‑distance reflective switches that detect targets up to 12 inches (305 mm) with 90 % reflective material, and up to 30 inches for the 30VZ version. They operate with an open‑collector output and are designed for use with PLCs and TTL logic in conveyor, security and dispensing applications.
Key specifications include a supply voltage range of 10‑30 V (OPB720A) or 4‑7 V (OPB720B), ambient‑light rejection below 100 kLux, a 39‑inch (990 mm) lead length with 28 AWG wire, and operating temperature ranges of 0 °C to +50 °C (A) or +70 °C (B). The manual also covers safety classifications, wiring diagrams, and typical voltage response curves for various reflective targets.
| Maximum detection distance | 12 in (305 mm) |
|---|---|
| Minimum detectable object size | 0.08 in (2 mm) |
| Ambient light rejection | < 100 kLux |
| Supply voltage range (OPB720A) | 10 V to 30 V |
| Output type | Open collector |
| Lead length | 39 in (990 mm) with 28 AWG wire |
| Operating temperature range (OPB720A) | 0 °C to +50 °C |
| Operating temperature range (OPB720B) | 0 °C to +70 °C |
| Collector DC current (sink) | 50 mA |
| Power dissipation | 300 mW |
| Maximum collector voltage | 30 V |
The OPB720A series operates from 10 V to 30 V.
Standard versions detect up to 12 inches (305 mm), while the 30VZ version can detect up to 30 inches.
The switches provide an open‑collector output.