| Quantity: | |
|---|---|
GL20 / GL40
GWIEC
GL20 and GL40 light curtains use parallel infrared transmitter and receiver beams to monitor a detection area. Compare beam pitch, beam count, monitored width, housing dimensions, output and response time.
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A transmitter and receiver face each other across the monitored area. The transmitter scans infrared beams; an interrupted beam changes the receiver output. The catalog describes direct relay or digital-interface connection without a separate controller, depending on the selected version.
The compact aluminum housing is listed as 25 x 25 mm. A sliding-rail form is listed as 35 x 30 x 1.15 mm. Beam pitch options are 20 and 40 mm, with customized pitch, height and interfaces available.
| Code segment | Meaning |
|---|---|
| GL | Light curtain family |
| 20 / 40 | 20 / 40 mm beam pitch |
| T8 | 8 beams; other beam counts are listed in the dimension tables |
| N1 / N2 / N3 | NPN NO / NC / NO + NC |
| P1 / P3 | PNP NO / NO + NC |
| 02 | Detection-range code; confirm the selected range |
Standard configuration: 0.3 m lead plus 2 m cable, four mounting brackets per pair, individual receiver beam-status LEDs and a 10–30 V DC standard supply. The catalog lists a four-pin M12 connection. Contact GWIEC for the exact pin assignment of the ordered version.
| Beams | Detection width (mm) | A (mm) | B (mm) | C (mm) |
|---|---|---|---|---|
| 6 | 100 | 184 | 172 | 158 |
| 8 | 140 | 224 | 212 | 198 |
| 12 | 220 | 304 | 392 (catalog; confirm) | 278 |
| 16 | 300 | 384 | 372 | 358 |
| 20 | 380 | 464 | 452 | 438 |
| 24 | 460 | 544 | 532 | 518 |
| 28 | 540 | 624 | 612 | 598 |
| 32 | 620 | 704 | 692 | 678 |
| 36 | 700 | 784 | 772 | 758 |
| 40 | 780 | 864 | 852 | 838 |
| 44 | 860 | 944 | 932 | 918 |
| 48 | 940 | 1024 | 1012 | 998 |
| Beams | Detection width (mm) | A (mm) | B (mm) | C (mm) |
|---|---|---|---|---|
| 4 | 120 | 207 | 195 | 181 |
| 6 | 200 | 287 | 275 | 261 |
| 8 | 280 | 367 | 355 | 341 |
| 10 | 360 | 447 | 435 | 421 |
| 12 | 440 | 527 | 515 | 501 |
| 14 | 520 | 607 | 595 | 581 |
| 16 | 600 | 687 | 675 | 661 |
| 18 | 680 | 767 | 755 | 741 |
| 20 | 760 | 847 | 835 | 821 |
| 22 | 840 | 927 | 915 | 901 |
| 24 | 920 | 1007 | 995 | 981 |
| 28 | 1080 | 1167 | 1155 | 1141 |
| 32 | 1240 | 1327 | 1315 | 1301 |
| 36 | 1400 | 1487 | 1475 | 1461 |
| 40 | 1560 | 1647 | 1635 | 1621 |
| 44 | 1720 | 1807 | 1795 | 1781 |
| 48 | 1880 | 1967 | 1955 | 1941 |
The dimension table specifies a 7 m through-beam distance. Its target column gives opaque objects at least Ø32 mm for GL20 and at least Ø52 mm for GL40. Overall length formula: GL20 = 20 mm x beam count + 64 mm; GL40 = 40 mm x beam count + 47 mm.
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| Parameter | Catalog specification |
|---|---|
| Detection distance | 0.3–8 m (catalog performance table); 7 m in dimension table |
| Supply | Standard 10–30 V DC; performance table also lists 5 / 12 / 24 / 36 V DC versions—confirm model |
| Quiescent current | ≤100 mA |
| Output current | ≤300 mA |
| Hysteresis | ≤10% of detection distance |
| Response time | ≤30 ms |
| Beam diameter | 5 mm |
| Light source | Modulated infrared diode, 950 nm |
| Angular tolerance | Within ±5° at ≥3 m |
| Ingress protection | IP64 (performance table) |
| Housing / end caps / brackets | Aluminum alloy / nylon / cold-rolled steel |
| Output | NPN or PNP; computer / equipment serial communication versions listed |
| Residual voltage | DC three-wire: ≤0.7 V DC |
| Ambient-light immunity | Sunlight 10,000 lx; incandescent lamp 3,000 lx |
| Temperature influence | Within 10% of the +25 °C detection distance over −25 to +70 °C |
| Insulation resistance | ≥20 MΩ at 500 V DC |
| Dielectric withstand | 1500 V AC, 50/60 Hz, 1 minute |
| Vibration | 10–55 Hz; 1 mm double amplitude; X/Y/Z, 2 h per axis |
| Shock | 500 m/s² (50 G), three times in each X/Y/Z direction |
| Operating temperature | −10 to +55 °C, no freezing |
| Storage temperature | −30 to +80 °C, no freezing |
| Operating humidity | 15–85% RH |
| Indicator | Red LED |
| Connection | Cable plug; standard 2 m cable or customized |
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Catalog examples include packaging insertion detection, molding-machine access, vehicle passage, welding-cell perimeter detection, presses and restricted-area monitoring. Select according to target size, installation geometry and the machine stopping time; the application illustration alone does not establish machine-safety suitability.
| Detection application | Beam pitch in the catalog application guide | Illustration |
|---|---|---|
| Finger | 10 mm | View original image |
| Palm | 20 / 25 mm | View original image |
| Wrist / body | 40 / 60 mm | View original image Wrist and body detection illustration  Click outside the image or press Esc to close. Open original image |
Selection note: The catalog references IEC 61496-1/2, but this page does not establish a certified safety type or performance level. Request documentation for the exact model and validate the machine installation. The GL20 12-beam B dimension is printed 392 mm while A is 304 mm; confirm this dimension. Supply, protection-height and target-resolution statements vary across the source pages; confirm the ordered configuration.
Values are transcribed from the GWIEC sensor catalog, pages 38–41. A dash means no model is listed in that source cell. Nominal distance and an operating/set distance are different quantities. Select the complete model, output, supply, connection and mounting dimensions together.
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Compare light curtain sensor families · All proximity sensor categories · Contact GWIEC for model confirmation
