DQT Long-Range Safety Light Curtain (ESPE)

A long-range, through-beam safety light curtain for large machinery and guarding at distance. Rectangular 51×35 mm profile with resolutions 10/20/40/80 mm (optional 25/30 mm); typical response time ≤ 15 ms; enclosure rating IP65; high ambient light immunity. Dual-channel NPN/PNP safety outputs with 5/7-core wiring examples. Standard sensing distance 0.3–3 m (select builds 0.3–6 m; project long-range available).

View Detailed DQT SeriesDQT Video Demo
DQT long-range safety light curtain main image
DQT infrared safety light curtain details
51×35 mm body, robust connectors
DQT light curtain application view
Stable through-beam guarding for long spans
Product Highlights
  • Long-range through-beam design with strong anti-interference electronics for stable operation across wide gates and presses.
  • Self-diagnosis, short/over-current protection and clear indicators for fast commissioning and troubleshooting.
  • ≤15 ms response helps optimize ISO 13855 safety distance while maintaining productivity.
  • High ambient light immunity with optical filtering; resistant to flicker, arc/glare and stray light.
  • 51×35 mm rugged body, IP65; circular aviation plug with dedicated cables; emitter/receiver core protection.
  • Conforms to IEC 61496-1/-2; integrate with a safety relay/PLC for PL-capable architectures.

Values normalized from the provided DQT sheets; if discrepancies exist, the official datasheet and delivered certificates take precedence.

Resolution & Application Guide
Resolution (K)Typical Application
10 mmFinger / close-in guarding with long spans
20 mmPalm / access openings
40 mmHand/arm or body presence along aisles and perimeters
80 mmPerimeter / body detection with fewer beams

Protective height H = (n − 1) × K. Overall length L = P + H + J + 36 (18 mm end allowance on both sides). P/J vary with resolution; see spec tables below.

Technical Parameters (DQT Series)

CategoryItemTypical Value / OptionNotes
OpticalOperating principleThrough-beam infrared LED, modulatedEmitter/receiver pair; high anti-interference
Resolution (K)10 / 20 / 40 / 80 mm (opt. 25/30 mm)Finger / Palm / Hand-arm / Body
Protective height (H)H = (n−1) × Kn = number of beams
Response time≤ 15 msVaries with beams
Ambient light immunityHigh immunityFiltering to suppress flicker/arc glare
Sensing range0.3–3 m (std), 0.3–6 m (select)Project long-range available
Electrical / I/OSupplyDC 12/24 V; AC 110–220 V (via controller)Reverse/over-voltage protection
Safety outputsDual-channel NPN / PNP (NO/NC)5-core / 7-core examples
Channel capability≤ 200 mA (typ.)Transistor OSSD
ProtectionShort / Over-current / Over-loadAuto recovery
IndicatorsPower / Run / BlockedFront LEDs
ConnectorCircular aviation, M12 cableDedicated harness
SyncOpticalFewer cables
Mechanical / EnvironmentBody section~51 × 35 mm (rectangular)Aluminum body; reinforced end-caps
Overall lengthL = P + H + J + 3618 mm allowance ×2
Ingress protectionIP65Dust-tight, water-jet resistant
Operating temp.−10 ~ +40 °CStorage −25 ~ +55 °C
HumidityOperating 35–85 %RHStorage 35–95 %RH
ComplianceStandardsIEC 61496-1/-2Safety distance per ISO 13855
CertificationsCE (typ.)Refer to delivered certificates
System integrationSafety relay / Safety PLCIndependent dual inputs

DQT Series Detailed Specifications

Tables enumerate beam counts (n) per resolution (K) with protective height H and overall length L. Model format: DQT-K-NN-H (e.g., DQT-40-08-280).

K (mm)Beams nProtective Height H (mm)P/J (mm)Overall Length L (mm)Model ExampleStd. Range
10121105/32183DQT-10-12-1100.3–3 m
10141305/32203DQT-10-14-1300.3–3 m
10161505/32223DQT-10-16-1500.3–3 m
10181705/32243DQT-10-18-1700.3–3 m
10201905/32263DQT-10-20-1900.3–3 m
10222105/32283DQT-10-22-2100.3–3 m
10242305/32303DQT-10-24-2300.3–3 m
10262505/32323DQT-10-26-2500.3–3 m
10282705/32343DQT-10-28-2700.3–3 m
10302905/32363DQT-10-30-2900.3–3 m
10323105/32383DQT-10-32-3100.3–3 m
10343305/32403DQT-10-34-3300.3–3 m
10363505/32423DQT-10-36-3500.3–3 m
10383705/32443DQT-10-38-3700.3–3 m
10403905/32463DQT-10-40-3900.3–3 m
10424105/32483DQT-10-42-4100.3–3 m
10444305/32503DQT-10-44-4300.3–3 m
10464505/32523DQT-10-46-4500.3–3 m
10484705/32543DQT-10-48-4700.3–3 m
10504905/32563DQT-10-50-4900.3–3 m
10525105/32583DQT-10-52-5100.3–3 m
10545305/32603DQT-10-54-5300.3–3 m
10565505/32623DQT-10-56-5500.3–3 m
10585705/32643DQT-10-58-5700.3–3 m
10605905/32663DQT-10-60-5900.3–3 m
10626105/32683DQT-10-62-6100.3–3 m
10646305/32703DQT-10-64-6300.3–3 m
10666505/32723DQT-10-66-6500.3–3 m
10686705/32743DQT-10-68-6700.3–3 m
10706905/32763DQT-10-70-6900.3–3 m
10727105/32783DQT-10-72-7100.3–3 m

For extended 0.3–6 m builds and wiring (5/7-core), specify on order. Keep model format DQT-K-NN-H.

Typical Applications

  • Presses / shears / large gates: long-range guarding with fewer cables, high noise immunity.
  • Robot cells / logistics perimeters: body/presence detection with 40–80 mm resolutions.
  • Assembly / access openings: 10–20 mm for finger/palm detection over long spans.
  • General machinery: integrate with a safety relay/PLC (EDM/feedback) for reliable stops and interlocks.

Safety distance reference (ISO 13855): S = K × T + C, where T is the measured machine stopping time.

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