GY-18NR-SN is an improved version of GY-18. It adds an infrared lens. Other parameters are the same as GY-18. The rated voltage is 12-24VDC, the working temperature range is -25-55℃, and the relative humidity range is 35-85%
The GY-18 is a photoelectric sensor that detects opaque objects as small as 10 mm in diameter. It operates from a 12‑24 VDC supply, offers collector outputs (normally open or closed), and features an IP66 protection rating. Technical parameters include a maximum detection distance of up to 400 mm, response time under 1 ms, and a maximum output current of 100 mA.
The manual includes wiring diagrams for both PNP and NPN output configurations, an operation illustration, and safety notes. Users are advised to avoid direct sunlight on the sensor and to respect the reverse‑polarity and short‑circuit protection built into the device. This manual is written in Chinese.
| Maximum detection distance | 400 mm |
|---|---|
| Power supply voltage | 12‑24 VDC |
| Light source | 850 nm infrared modulated light, 680 nm red modulated light |
| Maximum output current | 100 mA |
| Power consumption | < 25 mA |
| Response time | < 1 ms |
| IP protection rating | IP66 |
| Operating temperature range | -25 °C to 55 °C |
| Dimensions | 31 mm × 77 mm |
The sensor operates on a 12‑24 VDC power supply.
It can detect objects up to 400 mm away (up to 1 m for certain variants).
Yes, it has built‑in reverse polarity protection and short‑circuit/overload protection.
The sensor is rated IP66 for dust and water protection.