Description
The Omron E3X-NH21 is a fiber-optic photoelectric sensor amplifier designed for high-precision detection in industrial automation systems. Operating on 12–24 VDC, it features an NPN open-collector output with selectable Light-ON/Dark-ON modes and an integrated timer function. This unit is engineered for stable sensing performance in applications requiring fine sensitivity adjustment and reliable signal control.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Omron |
| Category |
Sensors & Switches |
| Part Number |
E3X-NH21 |
| Subcategory |
Photoelectric |
| Series |
E3X-NH |
| Amplifier Type |
Timer Function |
| Sensor Type |
Fiber-Optic Amplifier |
| Light Source |
Red LED (680 nm) |
| Supply Voltage |
12 to 24 VDC ±10% (Ripple 10% max.) |
| Current Consumption |
75 mA max. |
| Output Type |
NPN Open Collector |
| Max Load Current |
50 mA |
| Operation Mode |
Light-ON / Dark-ON selectable |
| Response Time |
1 ms max. |
| Mounting Type |
DIN Rail |
| Operating Temperature |
-25°C to +55°C |
| Protection |
Output short-circuit and reverse polarity protection |
| Weight |
0.01 lbs |
Information About E3X-NH21
The E3X-NH21 is a timer-function amplifier from Omron’s E3X-NH fiber-optic sensor series, developed for use with E32 fiber units in demanding detection environments. It incorporates a red LED light source (680 nm) and supports automatic or manual fine threshold adjustment for accurate detection of small or low-contrast objects. Designed for DIN rail mounting, the unit integrates output short-circuit protection and reverse polarity protection for enhanced operational reliability. Its compact housing and selectable operation modes make it suitable for tightly spaced control panels and multi-sensor installations.
Key Features:
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Fiber-Optic Amplifier Design: Compatible with E32 series fiber heads for flexible sensing configurations.
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NPN Open-Collector Output: 50 mA max load current for direct PLC interfacing.
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Timer Function Built-In: Integrated timing control for delayed output operation.
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Selectable Light-ON/Dark-ON Mode: Configurable output logic for application flexibility.
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Fine Sensitivity Adjustment: 13-level manual threshold adjustment for precise detection tuning.
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Red LED Light Source (680 nm): Stable and consistent optical emission for reliable sensing.
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Protection Circuits: Includes output short-circuit and reverse polarity protection.
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DIN Rail Mounting: Compact housing suitable for standard control panel installation.
The E3X-NH21 delivers the reliability and precision required for high-accuracy fiber-optic sensing applications in industrial automation systems.
