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DQT Long-Range Safety Light Curtain (ESPE)

A long-range, through-beam safety light curtain for large machinery and guarding at distance — the DQA series extension for installations that need more than 32 beams. Resolutions 10/20/40/80 mm, up to 72 beams, protective heights 110–2840 mm. Transistor outputs with single- or dual-output signal selection and 5-core or 7-core wiring. Operating distance and response time are not published for this series — contact the factory with your actual span before finalising a layout.

View Detailed DQT Series
Robust housing and connectors
Stable through-beam guarding for long spans
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Product Highlights
  • Up to 72 beams — the highest beam count in the long-range family, for protective heights to 2840 mm from a single pair.
  • Long-range through-beam design for wide gates, large presses and perimeter spans.
  • Four beam pitches (10 / 20 / 40 / 80 mm), so a long span does not force a coarse resolution.
  • Self-diagnosis, short/over-current protection and clear indicators for fast commissioning and troubleshooting.
  • Simple wiring: 5-core or 7-core, with single- or dual-output signal selection.

The DQT is a through-beam AOPD designed with reference to IEC 61496 and to the machinery-safety standards ISO 13849 / ISO 13855. DAIDISIKE has not published a type classification (Type 2 / Type 4) or a performance level for this series, nor a confirmed operating distance, response time, supply voltage, IP rating or operating temperature — none of these are stated on this page. Contact the factory for the confirmed values, or use the DQT4 series where a documented rating is required.

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
Resolution (beam pitch K)10 / 20 / 40 / 80 mmFinger / Palm / Hand-arm / Body
Beam countUp to 72The DQA extension above 32 beams
Protective height (H)H = (n−1) × K; 110–2840 mmn = number of beams
Response timeContact factoryNot published for the DQT series
Detection distanceContact factoryLong-distance series; confirmed range not published
Electrical / I/OOutputsTransistor; single- or dual-output signal selectionSpecify on order
Wiring5-core or 7-corePer build
Supply voltageContact factoryNot published for the DQT series
IndicatorsPower / Run / BlockedFront LEDs
Mechanical / EnvironmentBody section35 × 51 mm × L (same extrusion as the DQA series)Per the DQA/DQT dimension drawing
Overall lengthL = P + H + J + 3618 mm allowance ×2; connector tail adds 44 mm
Ingress protectionContact factoryNot published for the DQT series
Operating temp.Contact factoryNot published for the DQT series
ComplianceStandardsThrough-beam AOPD designed with reference to IEC 61496; safety distance per ISO 13855No type class (Type 2/4) or performance level is published for this series — confirm with the factory
System integrationSafety relay / Safety PLCIndependent dual inputs

DQT Series Detailed Specifications

Tables enumerate the catalogued beam counts (n) per beam pitch (K) with protective height H and overall length L. Model format: DQTnn/K-H (e.g., DQT08/40-280).

K (mm)Beams nProtective Height H (mm)P/J (mm)Overall Length L (mm)Model ExampleDetection Distance
10121105/32183DQT12/10-110Contact factory
10141305/32203DQT14/10-130Contact factory
10161505/32223DQT16/10-150Contact factory
10181705/32243DQT18/10-170Contact factory
10201905/32263DQT20/10-190Contact factory
10222105/32283DQT22/10-210Contact factory
10242305/32303DQT24/10-230Contact factory
10262505/32323DQT26/10-250Contact factory
10282705/32343DQT28/10-270Contact factory
10302905/32363DQT30/10-290Contact factory
10323105/32383DQT32/10-310Contact factory
10343305/32403DQT34/10-330Contact factory
10363505/32423DQT36/10-350Contact factory
10383705/32443DQT38/10-370Contact factory
10403905/32463DQT40/10-390Contact factory
10424105/32483DQT42/10-410Contact factory
10444305/32503DQT44/10-430Contact factory
10464505/32523DQT46/10-450Contact factory
10484705/32543DQT48/10-470Contact factory
10504905/32563DQT50/10-490Contact factory
10525105/32583DQT52/10-510Contact factory
10545305/32603DQT54/10-530Contact factory
10565505/32623DQT56/10-550Contact factory
10585705/32643DQT58/10-570Contact factory
10605905/32663DQT60/10-590Contact factory
10626105/32683DQT62/10-610Contact factory
10646305/32703DQT64/10-630Contact factory
10666505/32723DQT66/10-650Contact factory
10686705/32743DQT68/10-670Contact factory
10706905/32763DQT70/10-690Contact factory

Specify the wiring (5-core or 7-core) on order. Keep model format DQTnn/K-H. The DQT is the catalogue's long-distance series, but the operating distance is not published in the DQT catalogue data — contact the factory to confirm the range for your span before you commit to a layout.

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.

Frequently Asked Questions

What resolution should I choose for the DQT long-range light curtain?

Match the resolution to the smallest body part that can reach the hazard: 10 mm for finger protection, 20 mm for palm/hand access, and 40/80 mm for hand-arm or body/perimeter guarding. The DQT catalogue lists four beam pitches — 10, 20, 40 and 80 mm — so one long-range series covers presses, large gates and robot-cell perimeters.

What is the difference between the DQT and the DQA?

Beam count. The DQA is the long-range through-beam series up to 32 beams; the DQT is its extension for installations that need more — up to 72 beams, giving protective heights of 110–2840 mm. The two share the same long-range through-beam design and 5-core / 7-core wiring. If your part number would need more than 32 beams at the pitch you have chosen, the catalogue directs you from DQA to DQT.

What safety type / performance level does the DQT carry?

The DQT is a through-beam opto-electronic protective device (AOPD) — a product category designed with reference to IEC 61496 and to the machinery-safety standards ISO 13849 / ISO 13855. DAIDISIKE has not published a type classification (Type 2 / Type 4) or a performance level for the DQT series, so none is claimed here; request the current test documentation from the factory before specifying the DQT into a rated safety function. Where a documented Type 4 / PL e / SIL 3 device is required, use the DQT4 series.

How do I calculate the minimum safety distance for the DQT?

Use ISO 13855: S = K × T + C, where K = 2000 mm/s is the hand-speed constant, T is the machine stop time plus the curtain response time, and C is the intrusion factor derived from the resolution. The DQT response time is not published in the catalogue data — obtain the confirmed figure from the factory before you calculate T. Our ISO 13855 calculator handles the rest.

What operating distance does the DQT reach?

The DQT is the catalogue's long-distance series, but DAIDISIKE has not published a confirmed operating-distance figure for it — an older DAIDISIKE web page quoted 3–35 m, which has not been verified against the current catalogue, so it is not stated here. Tell the factory your actual emitter-to-receiver span when you enquire and ask for the confirmed range in writing; on a long-span installation this figure decides whether the layout works at all.

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Technical specs reviewed by Engineer Cai, Senior Application Engineer. See certificates.

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