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        • Lifecycle status

          Active / Available from OEM
          Apter Power supplies LS-H21 as part of a verified LS-400 sensing pair, with the matching amplifier identified at enquiry.

        LS-H21

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Panasonic LS-H21 places a focused laser sensing point at the machine while a compatible LS-400 amplifier handles setup and output decisions.
        In Stock
        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
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        Technical specifications for LS-H21

        • Manufacturer:
          Panasonic
        • Part Number:
          LS-H21
        • Product Family:
          Panasonic
        • Product Type:
          LS-400 Diffuse-Reflective Laser Sensor Head
        • Stock:
          1
        • Product Role:
          Diffuse-reflective sensor head
        • Applicable Amplifiers:
          LS-401(P), LS-401(P)-C2, LS-403
        • Sensing Range U-LG:
          30-1000 mm
        • Sensing Range STD:
          30-500 mm
        • Sensing Range FAST/H-SP:
          30-300 mm
        • Laser:
          Visible red, Class 2, 655 nm, 3 mW maximum
        • Protection:
          IP40
        • Cable:
          2 m shielded cable; not extendable
        • Weight:
          0.03 kg
        • Tariff Code:
          Please confirm the destination before shipping
        • Country of origin:
          Japan
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Head Selection Optical Setup Service Checks Applications

        Features:

        • Focused optical point: The laser spot supports alignment to small features or controlled target locations.
        • Remote evaluation: The separate amplifier keeps teaching and output decisions away from the compact sensing head.
        • Defined pairing: Panasonic lists the compatible LS-400 amplifiers, preventing family-name assumptions during replacement.
        LS-H21 is the optical head; it does not replace the amplifier that supplies processing and controller outputs.

        The best setup uses the smallest, darkest and most distant expected target while the real background is present.

        Cable routing and beam safety must be preserved because the head cable is not intended for field extension.

        Apter Power can help confirm the Panasonic LS-H21 LS-400 Diffuse-Reflective Laser Sensor Head, compatible amplifier and sensing geometry before quotation.
        Panasonic LS-H21 LS-400 Diffuse-Reflective Laser Sensor Head Manuals,Datasheets,Link
        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Pairing list: Use only the amplifier models Panasonic identifies for the LS-H21 sensing head.
        • Range mode: Choose the amplifier operating mode from real distance and response needs rather than maximum range alone.
        • Spot geometry: Confirm the focused beam remains on the intended feature through machine tolerance.
        • Cable boundary: Plan routing within the fixed head cable instead of adding an unsupported extension.
        • Worst-case target: Teach with the least reflective and most distant acceptable production item.
        • Background proof: Test an empty station so the surface behind the target is not accepted.
        • Beam awareness: Mount the Class 2 laser to avoid deliberate viewing and unexpected reflection paths.
        • Mechanical stability: A narrow spot requires rigid mounting when equipment vibration is present.
        • Indicator comparison: Use head and amplifier indications to separate optical loss from output wiring faults.
        • Lens inspection: Clean contamination with a suitable method before changing stored settings.
        • Cable test: Intermittent response during cable movement indicates a head assembly problem, not an amplifier teaching issue.
        • Pairing record: Store the exact head and amplifier codes together for future maintenance.
        • Small-feature detection: Places a focused spot on narrow tabs, parts or package details.
        • Longer stand-off sensing: Keeps the optical head away from moving tooling while the chosen mode preserves margin.
        • Position confirmation: Provides optical feedback for assembly, transfer and inspection stations.
        • Existing LS-400 service: Restores a documented LS-H21 head while retaining a verified compatible amplifier.
        Description
        Where the target is small or the sensing position is difficult to access, LS-H21 keeps the optical head near the work while the adjustment interface remains at the amplifier. The focused spot helps define a precise inspection point without placing controls in the moving area.

        Stable results depend on the mounting around LS-H21: the bracket must resist vibration, the lens must remain clean and the beam must stay on the intended feature throughout normal travel. Teaching should be completed with representative good and bad parts.

        This head is one half of an LS-400 sensing system, so LS-H21 must be paired with a supported amplifier and used within its fixed cable and laser-safety limits. It is not a direct PLC sensor, and an improvised cable extension changes the documented arrangement.
        Alternative Names
        LSH21
        Technical notes
        Mount LS-H21 so the beam is not directed toward personnel and the target stays inside the required range in every machine state. Do not extend the attached head cable. Pair it only with an officially listed LS-400 amplifier, then teach the least favorable target and verify the background, vibration and ambient-light margin.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        An LS-H21 head must be connected to an existing amplifier. How should compatibility be confirmed before ordering?
        Match the amplifier against Panasonic's LS-H21 pairing list and verify the required mode, output type and installation wiring.
        LS-H21 detects a white master but misses a dark production target. What should be retaught?
        Teach the least reflective real target at its most difficult distance with the actual background and machine vibration present.
        The LS-H21 cable cannot reach a relocated panel. Is an inline extension an approved solution?
        No. Panasonic states that the head cable is not extendable; change the layout or select an approved configuration.
        LS-H21 output becomes unstable only while the machine vibrates. Which checks separate optics from electronics?
        Watch the spot and signal indication while securing the bracket, then compare them with amplifier and PLC state changes.
        An LS-H21 head has been wired directly to a PLC input, but the input never changes. What is missing?
        LS-H21 is an optical head and needs a compatible LS-400 amplifier to process the signal and provide the controller output.
        LS-H21 becomes unstable after being moved to another LS-400 amplifier. What should be verified before retuning?
        Confirm that the amplifier is an approved pairing, then check the head connector, fixed cable, spot alignment and actual target distance.

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