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Omron / Sentech E3ZM-C (oil-resistant compact SUS) machine vision sensor
Omron / SentechPhotoelectric sensors
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Omron / Sentech E3ZM-C Oil-Resistant Compact Stainless-Steel Photoelectric Sensor

E3ZM-C

The E3ZM-C is an oil-resistant, compact stainless-steel (SUS316L) photoelectric sensor family available in through-beam (E3ZM-CT, up to 15-20 m), retro-reflective with MSR (E3ZM-CR, 4 m), diffuse-reflective (E3ZM-CD, 1 m) and background-suppression / BGS reflective (E3ZM-CL, 10-200 mm) variants. Light sources are infrared LED (870 nm), red LED (650/660 nm) or a high-visibility orange LED (615 nm) on long-range through-beam models, with response times of 1 ms (2 ms for the 20 m orange through-beam). All models run on 10-30 VDC with an open-collector NPN or PNP control output (100 mA max), and offer reversed-polarity, output short-circuit and mutual-interference protection. The body is rated IEC IP67 plus DIN 40050-9 IP69K with oil resistance to Omron's in-house standard, operating from -25 to 55 °C, and connects via a 2 m pre-wired cable or an M12 twist-and-click (-M1TJ) pre-wired connector.

Brand
Omron / Sentech
Sensor type
Photoelectric sensor
Sensing method
Through-beam, retro-reflective (MSR), diffuse-reflective and BGS/background-suppression variants (diffuse representative)
Light source
Infrared LED 870 nm (diffuse/through-beam); red LED 650/660 nm (retro/BGS); orange LED 615 nm (long-range through-beam)
Range / distance
1 m diffuse (E3ZM-CD); up to 15 m / 20 m through-beam, 4 m retro-reflective, 10-200 mm BGS
Response time
1 ms max (2 ms max on 20 m orange through-beam)
Output type
Open-collector NPN or PNP (model-dependent), 100 mA max, 30 VDC max
Communication
Discrete switching output (NPN/PNP open-collector)
Supply voltage
10-30 VDC, including 10% ripple (p-p)
Connection
Pre-wired 2 m cable; -M1TJ: M12 twist-and-click pre-wired connector (0.3 m)
Housing material
SUS316L stainless steel (lens PMMA, seal fluoro rubber)
Dimensions
10.8 mm (W) x 31 mm (H) x 21 mm (D)
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Technical overview

The E3ZM-C is a built-in-amplifier photoelectric sensor, not a camera — it is a discrete presence/position detector whose job is to tell a PLC or vision controller "target here / not here" as a clean switching edge. Omron offers it as a family of sensing methods in a SUS316L stainless body: through-beam (E3ZM-CT) reaching up to 15 m, or 20 m on the high-visibility orange-LED variant, for the longest, most reliable spans across a conveyor or guard; retro-reflective with MSR (E3ZM-CR) at 4 m where you can only mount on one side; diffuse-reflective (E3ZM-CD) at 1 m for direct object detection; and background-suppression/BGS (E3ZM-CL) over a tight 10-200 mm window when you must ignore whatever sits behind the target. Light source follows the method — 870 nm infrared on diffuse and through-beam, 650/660 nm red on retro and BGS for a visible alignment spot, and a 615 nm orange LED on the long-range through-beam where beam visibility aids setup. Choosing the right method per station is the core design decision: through-beam for range and accuracy, retro for one-sided mounting, diffuse for simple proximity, and BGS when background discrimination matters.

Electrically the sensor is straightforward to wire into existing 24 V machine control. It runs on 10-30 VDC (including 10% ripple p-p) and drives an open-collector output rated 100 mA max at up to 30 VDC, available as NPN or PNP depending on model, so it matches sinking or sourcing PLC input cards directly. Built-in reversed-polarity, output short-circuit and mutual-interference protection make it forgiving on a busy panel where several sensors sit side by side. Response time is 1 ms max (2 ms on the 20 m orange through-beam), which sets the timing budget: at 1 ms the sensor resolves closely spaced parts at typical conveyor speeds and is fast enough to act as a hardware trigger that hands a precise start-of-inspection edge to a downstream camera and strobe. Connection is via a pre-wired 2 m cable or, on the -M1TJ option, an M12 twist-and-click pre-wired connector (0.3 m pigtail) for tool-free service swaps.

Where the E3ZM-C earns its place is the environment rating. The housing is SUS316L stainless steel with a PMMA lens and fluoro-rubber seal, oil-resistant to Omron's in-house standard and rated IEC IP67 plus DIN 40050-9 IP69K — meaning it survives both submersion-class ingress and high-pressure, high-temperature washdown jets. That suits it to food and beverage washdown lines, machine-tool enclosures awash in cutting oil and coolant, and packaging cells hosed down between runs. The compact 10.8 x 31 x 21 mm body (approx. 90 g pre-wired, 150 g on through-beam) fits tight fixturing where a larger sensor will not, and the -25 to 55 °C operating range (storage -40 to 70 °C, no icing or condensation) covers chilled rooms through warm production halls. As a vision-system component, this is the rugged trigger or part-present interlock you place ahead of the camera, not the imaging device itself.

Best for

  • Hardware part-present trigger ahead of a machine-vision camera and strobe, delivering a clean 1 ms switching edge to start each inspection
  • Object detection on food and beverage washdown lines where IP67/IP69K and oil resistance are mandatory and stainless steel resists daily high-pressure cleaning
  • Coolant- and oil-soaked machine-tool enclosures (SUS316L body) for tool-change, chuck-present or guard-position confirmation
  • Conveyor sortation and packaging gap/edge detection using through-beam up to 15 m (20 m orange) for long, reliable spans
  • Background-suppression detection (10-200 mm BGS) where the part must be sensed while a fixed background behind it is ignored

Selection notes

  • Pick the sensing method to the geometry: through-beam (15/20 m) for maximum range and accuracy but needs emitter+receiver on both sides; retro-reflective with MSR (4 m) for one-sided mounting with a reflector; diffuse (1 m) for simple direct detection; BGS (10-200 mm) when you must reject a fixed background.
  • Match the output to your PLC input card — the open-collector output is NPN or PNP depending on model variant, rated 100 mA max at up to 30 VDC, so confirm sinking vs sourcing before ordering.
  • Budget timing around the 1 ms max response (2 ms on the 20 m orange through-beam); for high line speeds verify the part dwell exceeds the response window so closely spaced parts are not merged.
  • Choose termination for serviceability: 2 m pre-wired cable for a permanent run, or the -M1TJ M12 twist-and-click pre-wired connector (0.3 m) for fast field replacement without rewiring.
  • Confirm the environment fits the ratings: IEC IP67 + DIN 40050-9 IP69K with oil resistance to Omron's in-house standard, SUS316L housing, PMMA lens and fluoro-rubber seal, operating -25 to 55 °C — strong for washdown and coolant but check chemical compatibility of any aggressive cleaning agents against PMMA/fluoro rubber.
  • On panels with several units nearby, the built-in mutual-interference protection helps, but plan mounting spacing per the method's beam pattern to avoid crosstalk on adjacent through-beam pairs.

Specifications: General
BrandOmron / Sentech
Sensor typePhotoelectric sensor

Specifications: Performance
Range / distance1 m diffuse (E3ZM-CD); up to 15 m / 20 m through-beam, 4 m retro-reflective, 10-200 mm BGS
Response time1 ms max (2 ms max on 20 m orange through-beam)

Specifications: Interface
CommunicationDiscrete switching output (NPN/PNP open-collector)
ConnectionPre-wired 2 m cable; -M1TJ: M12 twist-and-click pre-wired connector (0.3 m)

Specifications: Electrical
Supply voltage10-30 VDC, including 10% ripple (p-p)

Specifications: Environment
Operating temperatureOperating -25 to 55 °C; storage -40 to 70 °C (no icing/condensation)
IP ratingIEC IP67 (oil resistance to Omron in-house standard) + DIN 40050-9 IP69K

Specifications: Sensing
Sensing methodThrough-beam, retro-reflective (MSR), diffuse-reflective and BGS/background-suppression variants (diffuse representative)
Light sourceInfrared LED 870 nm (diffuse/through-beam); red LED 650/660 nm (retro/BGS); orange LED 615 nm (long-range through-beam)

Specifications: Output
Output typeOpen-collector NPN or PNP (model-dependent), 100 mA max, 30 VDC max

Specifications: Mechanical
Housing materialSUS316L stainless steel (lens PMMA, seal fluoro rubber)
Dimensions10.8 mm (W) x 31 mm (H) x 21 mm (D)
WeightApprox. 90 g (diffuse/retro/BGS pre-wired); approx. 150 g (through-beam pre-wired)

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