Omron E3Z-D81 — 100 mm Diffuse-Reflective PNP, Pre-Wired 2m
SKU: E3Z-D81USD 18.00
Compact 20x11x31 mm diffuse-reflective photoelectric sensor with 100 mm sensing distance (white paper 100x100 mm), PNP open-collector output, infrared LED 860 nm, pre-wired 2 m oil-resistant cable, IP67. Corrects old DB's '500mm NPN M8' entry — actual sensor is 100mm PNP pre-wired.
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Product Overview
The E3Z-D81 is Omron's 100 mm diffuse-reflective photoelectric sensor in the compact 20x11x31 mm cuboid body — the PNP-output counterpart to the E3Z-D82 (1 m, PNP, already done) and the larger-range companion to the E3Z-D61 (100 mm NPN, NOT in our catalog). The 100 mm sensing distance is the workhorse class for short-range presence detection on conveyors, parts feeders, small-object counting, and end-of-stroke confirmation on packaging machines. The PNP output (sources current to the load) makes this SKU the right pick for PNP-input PLCs and European-style control panels — CJ1W-ID211 (already done) with the COM terminal wired to 0V, NX-ID5442 (NOT in catalog), or any PNP-input sensor junction box.
Spec correction vs old DB
The old DB title for E3Z-D81 read '500mm NPN M8 Connector' — this is incorrect. The E3Z-D81 per Omron's official datasheet is 100 mm diffuse-reflective, PNP output, pre-wired 2 m cable. The '500 mm NPN M8' SKU does not exist in the E3Z lineup; the closest matching SKU is the E3Z-D86 (100 mm PNP M8 connector, NOT in catalog). This SKU writeup uses the correct 100 mm / PNP / pre-wired 2 m specs.
Decoding E3Z-D81 within the E3Z-D@@ family
The E3Z-D@@ model code has multiple positional digits that encode sensing distance, output type, and connection method. The 'D' = diffuse-reflective (vs 'R' = retro-reflective with MSR, 'T' = through-beam). The '8' = PNP output (vs '6' = NPN in E3Z-D61/D62). The '1' = 100 mm sensing distance (vs '2' = 1 m in E3Z-D82). The absence of suffix (D81) = pre-wired 2 m cable; the '6' suffix (D86) = M8 4-pin connector; the '7' suffix (D87) = 1 m M8; the 'K' suffix (D81K) = oil-resistant PVC cable for coolant environments. The E3Z-D81 codepoint thus decodes as 100 mm diffuse-reflective PNP pre-wired 2 m.
Diffuse-reflective sensing principle and limitations
Diffuse-reflective sensors work by emitting light (infrared 860 nm in the E3Z-D81) from the sensor's LED, illuminating the target, and detecting the light that reflects back to the sensor's photodiode receiver (which is co-located with the emitter in the same housing). When the target is within the 100 mm sensing range and reflects sufficient light back, the output triggers. The 100 mm range is specified for a white paper 100x100 mm target with 90% reflectivity.
Key Features
- E3Z-series compact diffuse-reflective photoelectric sensor
- Sensing distance: 100 mm
- Output: PNP open-collector
- Light source: Infrared LED - NOT visible
- Response time: 1 ms max
- Operating voltage: 12 to 24 VDC +/-10%, ripple p-p 10% max
- Current consumption: 30 mA max
- Load current: 100 mA max
- SKU: E3Z-D81
- Series: E3Z Compact Photoelectric Sensor with Built-in Amplifier
- Voltage: 12 TO 24 VDC
- I/O: 0 I/O
Best-Fit Applications
- End-of-stroke confirmation on a small pneumatic cylinder - E3Z-D81 mounted 100 mm from the cylinder rod detects when the rod.
- Small-parts counting on a vibratory feeder - E3Z-D81 mounted 50-80 mm above the feeder bowl track detects 1-5 mm parts.
- Conveyor package detection - E3Z-D81 mounted 80-100 mm above a conveyor detects the leading edge of each package; the 1.
- PCB component presence check - E3Z-D81 mounted above a PCB after pick-and-place detects whether surface-mount components are present
Buying Checklist
- Pick E3Z-D81 2M for 100 mm diffuse-reflective PNP pre-wired 2 m - workhorse short-range PNP diffuse for European/Asian control panels
- Pick E3Z-D61 2M for 100 mm diffuse-reflective NPN pre-wired 2 m - for NPN-input PLCs
- Pick E3Z-D82 2M for 1 m diffuse-reflective PNP pre-wired 2 m - longer range, same form factor
- Pick E3Z-D86 for 100 mm diffuse-reflective PNP M8 4-pin connector - quick-disconnect installations
- Pick E3Z-D81K 2M for 100 mm diffuse-reflective PNP oil-resistant cable - for coolant environments
- Pick E3FA-DP21 for M18 cylindrical 100 mm diffuse PNP - larger body, threaded M18 mounting
Technical Specifications
| Model | E3Z-D81 (pre-wired 2 m) |
|---|---|
| Series | E3Z Compact Photoelectric Sensor with Built-in Amplifier |
| Type | Diffuse-reflective photoelectric sensor, PNP output, 100 mm range |
| Sensing Method | Diffuse-reflective (light from sensor reflects off target back to sensor) |
| Sensing Distance | 100 mm (white paper 100x100 mm reference target at 90% reflectivity) |
| Effective Sensing Distance (matte black paper) | 50-70 mm (depends on paper color/surface) |
| Effective Sensing Distance (shiny metal) | 60-80 mm |
| Differential Distance (Hysteresis) | 20% of sensing distance (typical) |
| Spot Size at Sensing Distance | Approx 15 mm diameter at 100 mm (for diffuse-reflective with circular aperture) |
| Output Type | PNP open-collector (sourcing) |
| Output Configuration | Dark-ON / Light-ON selectable via white wire (white to +V = Light-ON; white to 0V = Dark-ON) |
| Operating Voltage | 12 to 24 VDC +/-10%, ripple p-p 10% max |
| Current Consumption | 30 mA max |
| Load Current | 100 mA max |
| Residual Voltage (ON state) | 2 V max at 100 mA load |
Resources & Downloads
FAQ for E3Z-D81
What's the difference between E3Z-D81 and E3Z-D82?
Both are E3Z-series compact diffuse-reflective photoelectric sensors with the same 20x11x31 mm cuboid ABS body, same IP67 rating, same PNP open-collector output, same 1 ms response time, same IR 860 nm LED light source, same 4-wire pre-wired 2 m oil-resistant cable. The only difference is the sensing distance: E3Z-D81 (this SKU) is 100 mm range; E3Z-D82 (already done) is 1 m range.
What's the difference between E3Z-D81 and E3Z-D61?
Both are E3Z-series compact 100 mm diffuse-reflective photoelectric sensors with the same 20x11x31 mm body, same IP67 rating, same 1 ms response time, same IR 860 nm LED, same pre-wired 2 m cable. The only difference is the output type: E3Z-D81 (this SKU) is PNP open-collector (sources current when target detected), E3Z-D61 (NOT in our catalog) is NPN open-collector (sinks current when target detected). For PNP-input PLCs (CJ1W-ID211 with COM wired to 0V, NX-ID5442, E3X-NA41), pick the E3Z-D81.
Can the E3Z-D81 detect dark, transparent, or shiny targets?
The E3Z-D81 is a diffuse-reflective sensor with an infrared 860 nm LED light source. It works best on matte white or light-colored targets (rated 100 mm for white paper 100x100 mm at 90% reflectivity). For dark, transparent, or shiny targets, the effective range is significantly reduced: Matte black paper (~10% reflectivity): 30-50 mm effective range. Shiny metal (specular reflection): 60-80 mm but unreliable due to the angle-dependence of specular reflection.
Is the E3Z-D81 waterproof?
The E3Z-D81 is IP67 rated per IEC 60529, which means it's dust-tight and can withstand temporary water immersion (typically 1 m depth for 30 minutes). This is sufficient for: (a) Indoor factory environments with occasional water splash, oil mist, or coolant spray. (b) Outdoor installations under a cover or hood (not in direct rain). (c) Washdown-cleaned food processing equipment with low-pressure water spray.
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