The E3RA-TP21 is an Omron through-beam photoelectric sensor in a right-angle M18 plastic threaded cylindrical body with radial sensing direction. It uses a red LED light source and provides a PNP output, selectable Light-ON or Dark-ON via a switch. Supply voltage is 10 to 30 VDC, and the maximum sensing distance is 20 m. Connection is via an M12 4-pin connector. The part is listed as active and mature in the product lifecycle.
Omron E3RA-TP21 M18 Photoelectric Sensor, PNP, 20 m
MPNE3RA-TP21
Omron E3RA-TP21, M18 threaded cylindrical plastic body through-beam photoelectric sensor, PNP output, 20 m sensing distance, M12 4-pin connector, 10-30 VDC supply.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Sensing method | Through-beam |
| Type | Short body |
| Light source | Red LED |
| Parameter | Value |
|---|---|
| Supply voltage | 10 to 30 VDC |
| Parameter | Value |
|---|---|
| Connection | M12 4-pin connector |
| Parameter | Value |
|---|---|
| Dimensions | M18 |
| Output | PNP |
| Body type | Threaded Cylindrical |
| Operation | L-ON/D-ON selectable |
| Housing material | Plastic |
| Sensing direction | Radial |
| Product life cycle | Active |
| Max sensing distance | 20 m |
Product details
Frequently asked questions
When sourcing the E3RA-TP21, what is the closest functional second-source?
The E3ZM-T81 2M is a PNP through-beam but has a stainless steel body and prewired cable instead of the M12 connector. The E3ZM-T61 2M is NPN output. Neither is a direct drop-in without mechanical or wiring changes.
What is the listed size of the E3RA-TP21?
The barrel diameter is M18, and the body type is threaded cylindrical with a short body profile.
Will the E3RA-TP21 drop into a panel specified around the E3ZM-T61 2M?
No. The E3ZM-T61 2M is an NPN output with a stainless steel body and prewired cable; the E3RA-TP21 is PNP with a plastic body and M12 connector. Wiring and mechanical mounting differ.
MPN
E3RA-TP21