Panasonic LS-H91F Coaxial Retroreflective Digital Laser Sensor

Technical Overview

Coaxial retroreflective digital laser sensor head with 0.1-5m sensing range, Class 1 laser, IP40, -10 to 55°C operation, and multi-turn spot adjuster.

Key Features

Amplifier-separated digital laser sensor for versatile integration.
Coaxial retroreflective sensing principle for accurate detection.
Complies with FDA Class 1 laser regulations for enhanced safety.
Dual 4-digit digital display for simultaneous threshold and incident light intensity monitoring.
Easy two-switch operation (MODE key and jog switch) for intuitive settings.
Supports multiple sensing modes: Hysteresis, Window Comparator, 2 Independent Outputs, Differential Sensing.
Features a multi-turn spot-shape adjuster for precise beam alignment.
M.G.S. (Minutest Variations Sensing) function to optimize receiving sensitivity.
Automatic interference prevention function allows close mounting of up to 4 sensors.
Compatible with network communication via SC-GU3 series for remote monitoring (with LS-403 amplifier).
Threshold tracking function automatically adjusts to environmental changes, reducing maintenance.
Provides external input for laser emission halt and teaching functions.
Industry standard 25.4 mm mounting pitch ensures compatibility with existing brackets.
Robust IP40 protection against dust ingress.
Wide ambient operating temperature range of -10 to +55 °C.

Technical Specification Matrix

Parameter	Value
Applicable Amplifiers	LS-401(P), LS-401(P)-C2, LS-403
Sensing Range (U-LG Mode)	0.1 to 5 m (0.328 to 16.404 ft)
Sensing Range (STD Mode)	0.1 to 3 m (0.328 to 9.843 ft)
Sensing Range (FAST Mode)	0.1 to 1 m (0.328 to 3.281 ft)
Sensing Range (H-SP Mode)	0.1 to 1 m (0.328 to 3.281 ft)
Operation Indicator	Orange LED (lights up when amplifier output is ON)
Laser Emission Indicator	Green LED (lights up during laser emission)
Spot-Shape Adjuster	Multi-turn adjuster
Protection Rating	IP40 (IEC)
Ambient Temperature	-10 to +55 °C (+14 to +131 °F) (No dew condensation or icing allowed)
Storage Temperature	-20 to +70 °C (-4 to +158 °F)
Ambient Humidity	35 to 85% RH (Storage: 35 to 85% RH)
Ambient Illuminance	Incandescent light: 3,000 lx or less at the light-receiving face
Voltage Withstandability	1,000 V AC for one min. between all supply terminals connected together and enclosure
Insulation Resistance	20 MΩ or more, with 250 V DC megger between all supply terminals connected together and enclosure
Vibration Resistance	10 to 500 Hz frequency, 1.5 mm (0.059 in) double amplitude or maximum acceleration 98 m/s² in X, Y and Z directions for two hours each
Shock Resistance	98 m/s² acceleration (10 G approx.) in X, Y and Z directions three times each
Emitting Element Type	Red semiconductor laser, Class 1 (FDA/IEC/EN/JIS)
Max. Output	1 mW
Peak Emission Wavelength	655 nm (0.026 mil)
Enclosure Material	PBT (Mounting part: PEI), Lens cover: Acrylic
Cable	0.1 mm², single core two parallel shielded cables, 2 m (6.562 ft) long (Connector for amplifier attached)
Net Weight	30 g approx.
Gross Weight	50 g approx.
Physical Weight (kg)	0.03
Dimensions L x W x H (cm)	3.1 x 1.12 x 1.55

Industrial Applications

1. Precision Roll Stock Level Monitoring

Utilizing the coaxial retroreflective LS-H91F sensor to precisely monitor the remaining amount of sheet rolls or transparent films on a production line. Its Class 1 laser and small spot diameter (Ø1 mm at 1m) allow for high-accuracy measurement even on challenging reflective surfaces.

Problem Solved

Prevents costly line stoppages due to unexpected material depletion by providing continuous, accurate inventory of roll stock, optimizing material changeover scheduling.

Coaxial retroreflectiveroll stock monitoringmaterial managementClass 1 lasersmall spot diameterhigh precisiontransparent film detection

2. Complex Object Profile Detection in Assembly

Deploying the LS-H91F for stable and reliable detection of objects with intricate or uneven geometries on an automated assembly line. The sensor's Hysteresis mode and ability to adjust the spot shape (via the multi-turn adjuster on the amplifier) enable robust sensing despite surface irregularities.

Problem Solved

Minimizes false detection errors for irregularly shaped components, ensuring correct part presence and orientation, which enhances assembly quality and reduces rework.

Complex shape detectionassembly automationHysteresis modeadjustable spot sizeerror proofingmanufacturing processes

3. Remote Micro-Component Presence Verification

Employing the LS-H91F to accurately verify the presence or position of minute electronic component pins or small parts from a remote distance. The Class 1 laser combined with the multi-turn spot-shape adjuster allows for precise alignment and detection of tiny targets, even in constrained spaces.

Problem Solved

Enables non-contact, high-accuracy quality control for micro-components in electronics manufacturing, overcoming limitations of physical access and improving inspection reliability.

Micro-component detectionelectronic assemblyremote sensingClass 1 laserspot-shape adjustmentquality controlminiature parts