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Omron E3T-SL21 — Photoelectric Sensors

Omron E3T-SL21 Photoelectric Sensor, Diffuse NPN 30mm, IP67

MPNE3T-SL21

Omron, E3T Series, Photoelectric Sensor, E3T-SL21, Diffuse NPN, 30 mm Max Sensing, IP67.

$80.01 – $203.72Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

E3T-SL21 — Identification
ParameterValue
SeriesE3T
E3T-SL21 — Sensing
ParameterValue
Sensing methodDiffuse
Response time1 msec
E3T-SL21 — Electrical
ParameterValue
Supply voltage12-24V DC
E3T-SL21 — Environmental
ParameterValue
IP ratingIP67
Operating temperature, max.131 °F
E3T-SL21 — Mechanical
ParameterValue
Body materialPBT
E3T-SL21 — Approvals
ParameterValue
Standards / approvalsCE

Product details

What this sensor brings to your line

The E3T-SL21 is an Omron diffuse photoelectric sensor in the E3T series, switching NPN light-on at a 30 mm maximum sensing distance. It detects objects as small as 0.15 mm diameter, making it a solid choice for small-part presence on pick-and-place, feeder bowls, or conveyor gates. Supply is 12-24V DC, output sinks up to 50 mA, and response time is 1 msec. The 2 m prewired bare-wire cable keeps field termination simple. Built-in protections—output reverse polarity, output short-circuit, and supply reverse polarity—cut down on blown outputs during commissioning. IP67 rating means it handles washdown environments without a secondary shroud.

Mounting and wiring for integrators

Rectangular body is 25 mm high, 11 mm deep, 7 mm wide. Includes a right-angle sensing face, indicator lights, and a 2 m prewired bare-wire cable.

Frequently asked questions

When sourcing E3T-SL21, what's the closest functional second-source — E3T-SL11?

The E3T-SL11 is a same-series NPN light-on sensor but with a 15 mm max sensing range instead of the SL21's 30 mm. Body, wiring, and protections are identical. If your application only requires up to 15 mm, the SL11 can serve as an alternate; otherwise stick with the SL21 for the extra range.

What is E3T-SL21's listed series?

E3T-SL21 belongs to the Omron E3T series of miniature photoelectric sensors.

What is E3T-SL21's listed features?

The sensor includes output reverse polarity protection, output short-circuit protection, and power supply reverse polarity protection.

Will E3T-SL21 drop into a panel that was specified around E3T-SL11 without rewiring?

Yes, the E3T-SL21 has the same pinout, supply voltage, cable length, and mounting dimensions as the E3T-SL11. The only difference is sensing range, so no wiring changes are needed for a drop-in swap, but verify that the 30 mm range is either sufficient or intended.

MPN
E3T-SL21