The FS-N41N is a main unit in the Keyence FS-N40 series of digital fiber optic sensor amplifiers. Specifically, this cable type model uses an NPN output configuration and includes an OLED display for straightforward parameter setup and live value monitoring. Moreover, it serves as the primary amplifier in a chain, which means it manages the settings for all connected expansion units.
Detection speed is a defining feature of this amplifier. Users can select from eight response modes, ranging from a rapid 23 µs in S-HSPD mode up to 64 ms in TERA mode. Therefore, engineers can trade speed for stability depending on the application. For instance, high-speed part counting benefits from the fastest setting, while dusty or vibrating environments favor the slower, more filtered modes.
The light source is a red four-element LED with a wavelength of 660 nm. This four-element design improves detection stability on uneven or glossy targets compared with single-element emitters. Besides raw power, the amplifier's digital processing filters out ambient light interference, which keeps detection consistent under changing factory lighting.
One main unit can connect to as many as 16 expansion units, giving a total of 17 units in one chain. Meanwhile, a dual-output model counts as two units against this limit. Consequently, a single FS-N41N can coordinate a large sensing array with shared settings, which reduces wiring and setup time on multi-point machines.
The control output is open-collector with a maximum of 30 V and 100 mA per output. Residual voltage stays at 1.4 V at 10 mA and rises to 2 V across the 10–100 mA range. The amplifier accepts a supply of 10 to 30 VDC with 10% ripple or less. In addition, power consumption stays at 870 mW or less, dropping to 710 mW in ECO FULL mode, which suits low-power panel designs.
Mount the FS-N41N on a DIN rail or use the optional mounting bracket for panel fixing. Insert the fiber cable firmly until it clicks, then lock the protective cover. Route the cable with a gentle bend radius to avoid signal loss. Moreover, keep the amplifier away from heat sources and strong electromagnetic fields.
The amplifier works across -20 to +55 °C with no freezing. However, the upper limit derates when several units are stacked together. Therefore, leave a small gap between amplifiers in long chains. The unit has no published protection rating, so install it inside an enclosure that blocks dust and direct water splash.
1 x Keyence FS-N41N Amplifier Unit
1 x Fiber Lock Lever
1 x Quick Start Guide (English)
1 x Safety Precautions Sheet
Q1: What does the NPN output mean for wiring?
The FS-N41N switches the output to 0 V when active. Therefore, connect the load between the positive supply and the output terminal. For PNP switching, choose the PNP version of the same series instead.
Q2: Can the FS-N41N work as an expansion unit?
No. This model is a main unit, so it carries the display and control keys. Expansion units such as the FS-N43N lack a display and rely on the main unit for settings. Use one main unit per chain of up to 17 units.
Q3: How fast is the sensor in real applications?
In S-HSPD mode the response time is 23 µs, which suits small-part detection on high-speed lines. However, faster modes are more sensitive to noise. Therefore, most users start in FINE or TURBO mode and switch to the fastest setting only when needed.
Q4: What supply voltage does the amplifier require?
The unit accepts 10 to 30 VDC with ripple of 10% P-P or less. Use a Class 2 or LPS power source. Power draw is only 34 mA at 24 V, so several amplifiers can share one supply.
Q5: What shipping methods are available?
We ship worldwide using Fedex, UPS, and DHL. Each unit is packed with anti-static protection and transit insurance to ensure safe delivery.
| Brand Name | |
| Model No. | FS-N41N |
| Product Type | Digital Fiber Optic Sensor Amplifier |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
