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CZ-V21A

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KEYENCE CZ-V21A is an NPN digital RGB sensor amplifier main unit for color and mark detection with compatible CZ Series sensor heads.
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Technical specifications for CZ-V21A

  • Manufacturer:
    KEYENCE
  • Part Number:
    CZ-V21A
  • Product Family:
    KEYENCE
  • Product Type:
    Digital RGB Sensor Amplifier Main Unit
  • Stock:
    1
  • Amplifier Role:
    RGB sensor amplifier main unit
  • Output:
    NPN
  • Compatible System:
    KEYENCE CZ Series sensor heads
  • Function:
    Color and mark discrimination
  • Installation:
    Amplifier unit in supported CZ-V20 configuration
  • Weight:
    0.11 kg
  • Estimated shipping dimensions:
    6.98 x 3.6 x 2.25 cm
  • 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 Optical Setup Teaching Output Control Product Applications

Features:

  • RGB-based comparison: The amplifier evaluates color information for more selective decisions than simple light/dark sensing.
  • Separate optical head: Head selection and mounting can be adapted to the target while the amplifier remains accessible in the panel.
  • Teach-driven setup: Production samples can define the accepted color or mark condition during commissioning.
CZ-V21A forms the processing and output portion of a CZ Series color-sensing arrangement rather than a complete sensor by itself.

The NPN output must match the controller input convention, and the original sensor head must be included in the compatibility check.

Reliable detection is proven with the real material range because surface gloss, distance, angle, ambient light and target motion can change the received color signal.

Apter Power can help confirm the KEYENCE CZ-V21A Digital RGB Sensor Amplifier Main Unit, sensor head, NPN interface, teach method and target range before quotation.
KEYENCE CZ-V21A Digital RGB Sensor Amplifier Main Unit 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.
  • Head identity: Record and verify the exact compatible sensor head before changing the amplifier.
  • Stable geometry: Fix target distance and angle so normal mechanical variation stays inside the qualified range.
  • Lighting control: Limit uncontrolled ambient light and reflections reaching the sensing point.
  • Lens condition: Inspect and clean the optical head before interpreting a detection fault as amplifier failure.
  • Sample range: Use representative good and reject parts, not a single ideal sample.
  • Surface extremes: Include gloss, print density, shade and supplier variation expected in production.
  • Speed proof: Teach and validate with the target moving at actual line speed.
  • Change record: Save the final settings and identify the samples used for acceptance.
  • NPN circuit: Confirm input common and output wiring before applying power.
  • Logic state: Preserve the intended good, reject and fault interpretation at the PLC.
  • Reject timing: Verify controller delay and part tracking after a sensor change.
  • Safe testing: Disable or guard reject motion while proving output transitions.
  • Registration mark detection: Identifies colored print marks used to align packaging operations.
  • Color sorting: Separates qualified parts by taught color condition.
  • Label verification: Confirms the presence or shade of a target area on moving products.
  • Assembly checking: Detects a colored component or indicator before the next machine step.
Description
CZ-V21A processes RGB information from a compatible CZ Series sensor head to make discrete color or mark decisions in industrial inspection and registration tasks.

As the amplifier main unit, CZ-V21A provides the operator interface and NPN control output while the selected sensor head and optical arrangement determine how the target is illuminated and observed.

CZ-V21A must be matched to the installed head, controller input and taught target samples. An amplifier-only replacement cannot correct unstable optics, contaminated lenses or an unsuitable sensing geometry.
Alternative Names
CZV21A CZ V21A
Technical notes
CZ-V21A decisions depend on the complete optical setup, not the amplifier alone. Before replacement, save teach values and output logic, record the sensor-head model and mounting, and retain representative good and reject samples. Re-teach under production lighting, then challenge color, gloss, position and speed extremes before reconnecting automatic reject actions.
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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.
CZ-V21A accepts a sample during teaching but rejects similar parts on the line. What should be expanded in validation?
Include normal shade, gloss, position, ambient-light and speed variation, then adjust geometry or teach limits using representative production samples.
A replacement CZ-V21A has the correct NPN output but no stable signal. Is the amplifier necessarily defective?
No. Verify the sensor-head model, cable, optics, mounting distance and target presentation before isolating the amplifier as the fault.
Can CZ-V21A be published or purchased as a complete color sensor by itself?
No. It is the amplifier main unit and requires a compatible CZ Series sensor head. The quotation and installation scope should identify whether that head is included.
After CZ-V21A replacement, the PLC rejects good parts even though the display appears correct. What should be checked?
Compare output logic, threshold selection, wiring and reject timing with the saved configuration. A valid color reading can still be interpreted incorrectly downstream.
The optical head used with CZ-V21A becomes dusty every shift. Is frequent re-teaching an acceptable remedy?
No. Control contamination and define cleaning inspection. Re-teaching around a dirty lens can hide a deteriorating optical path and narrow the process margin.
A supplier changes pigment slightly on parts inspected by CZ-V21A. What is the safe production decision?
Quarantine representative new samples and revalidate the accepted and rejected populations before changing thresholds or releasing automatic inspection.

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