USD 72.47
Omron E3T-SL21M 2M is an M3-mount NPN limited-reflective sensor with a 5 to 30 mm range and a 2 m pre-wired cable.
The Omron E3T-SL21M 2M is an ultracompact limited-reflective photoelectric sensor with M3 mounting and a 2 m pre-wired cable. It detects a 50 × 50 mm white-paper target at 5 to 30 mm and uses a 650 nm red LED with an NPN open-collector Light-ON output. The sensor supports 12 to 24 VDC operation, responds within 1 ms and is rated IP67. Omron listed the exact model as selling and standard-stock on 2026-05-22; that record did not give current inventory.
An M3-mount limited-reflective sensor with NPN Light-ON output and a 5 to 30 mm sensing range.
| Parameter | Value |
|---|---|
| Product type | Ultracompact limited-reflective photoelectric sensor |
| Sensing distance | 5 to 30 mm (50 × 50 mm white paper) |
| Minimum sensing object | 0.15 mm min. diameter at 10 mm sensing distance |
| Differential distance | 6 mm max. |
| Light source | Red LED, 650 nm |
| Supply voltage | 12 to 24 VDC ±10%; ripple 10% p-p max. |
| Current consumption | 20 mA max. |
| Control output | NPN open collector, 26.4 VDC max., 50 mA max. |
| Operation mode | Light-ON |
| Response time | 1 ms max. (operate and reset) |
| Protective circuits | Output short-circuit, output reverse-polarity and power-supply reverse-polarity protection |
| Protection rating | IEC 60529 IP67 |
| Operating temperature | -25 to +55°C, no icing or condensation |
| Connection | Pre-wired, 2 m cable |
| Mounting | M3 mounting type; consult the Omron drawing for mounting details. The family documentation lists an instruction manual only for M3 types. |
| Housing material | Polybutylene terephthalate (PBT) |
| Lens and indicator material | Modified polyarylate |
| Physical Weight (kg) | 0.020 (approx., packaged). |
| Dimensions L x W x H (cm) | See the Omron E3T-SL□□M dimension drawing; no consolidated L × W × H value is stated in the text data. |
| Supply status | Active; Omron listed E3T-SL21M 2M as selling and standard-stock on 2026-05-22. That status record did not report current inventory. |
Engineering suggestions require suitability checks for your installation.
A 5 to 30 mm limited-reflective range can suit a target positioned near the sensor face.
Use the 50 × 50 mm white-paper reference range as a selection baseline and validate actual target performance at the installed distance.
Omron specifies a 0.15 mm minimum sensing-object diameter at a 10 mm sensing distance.
Check the real target material, shape and alignment at the required sensing point before fixing the sensor in place.
