Panasonic LS-401 Digital Laser Sensor Amplifier

Technical Overview

High-precision NPN digital laser sensor amplifier with dual 4-digit LED displays, 12-24V DC input, dual outputs, and response times down to 80 µs.

Key Features

Dual 4-digit digital display (green LED for threshold, red LED for incident light)
NPN open-collector transistor with two outputs (100 mA max sink current)
Four selectable response modes: H-SP (80 µs), FAST (150 µs), STD (500 µs), and U-LG (4 ms)
Advanced sensing modes including Hysteresis, Window Comparator, and Differential sensing
Automatic interference prevention for up to 4 closely-mounted sensor heads
Built-in timer functions (variable ON-delay, OFF-delay, and one-shot timer)
Compact 10 mm slim housing design for space-saving DIN-rail mounting

Technical Specification Matrix

Parameter	Value
Supply Voltage	12 to 24 V DC +/-10%
Current Consumption	40 mA or less (Normal operation at 24 V), 33 mA or less (ECO mode at 24 V)
Output Type	NPN open-collector transistor, dual outputs
Maximum Sink Current	100 mA
Response Time	80 µs or less (H-SP), 150 µs or less (FAST), 500 µs or less (STD), 4 ms or less (U-LG)
Digital Display	4-digit green LED (threshold) + 4-digit red LED (incident light)
Timer Function	ON-delay / OFF-delay / One-shot, range 1 to 9,999 ms
Interference Prevention	Incorporated (up to 4 sensor heads)
Short-Circuit Protection	Incorporated
Enclosure Material	Heat-resistant ABS, Polycarbonate (cover)
Ambient Temperature	-10 to +55 °C
Ambient Humidity	35 to 85% RH
Insulation Resistance	20 MOhms or more (at 250 V DC)
Voltage Withstandability	1,000 V AC for 1 minute
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	7.5 x 1 x 3

Industrial Applications

1. High-Speed Electronics Component Positioning

Utilizing the 80 µs high-speed response (H-SP mode) to detect the exact alignment and orientation of miniature electronic components on high-throughput assembly lines.

Problem Solved

Eliminates detection lag and positioning errors caused by slow sensor response times on fast-moving conveyors.

H-SP mode80 us responseNPN outputdual display

2. Glass Edge and Sheet Roll Runout Detection

Applying the Differential sensing mode or Window Comparator mode to monitor the position of glass sheet edges and calculate roll diameter changes.

Problem Solved

Prevents web misalignment and glass breakage by triggering high-speed alerts when edges drift outside strict threshold windows.

Differential sensingWindow comparatordual threshold

3. Dense Sensor Head Array Installation

Cascading up to 4 laser sensor heads adjacent to each other on a single DIN rail using the automatic interference prevention function.

Problem Solved

Resolves mutual optical interference and crosstalk issues when multiple sensors must operate in extremely tight spatial configurations.

Interference preventionDIN rail mountingcascadingslim housing