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DQT Long-distance Safety Light Curtain (Large Beam Count)

Long-distance, large-beam-count through-beam safety light curtain: up to 72 beam axes and protected heights near 2900 mm, in 4 pitches (10/20/40/80 mm), with sensing distance selectable up to 0.3-40 m and NPN, PNP or relay output. Designed to the Type 4 architecture of IEC 61496 and Category 4 of ISO 13849-1.

▶ Watch it in action: 3D Animation: How Light Curtains, Door Locks, Safety Mats & LiDAR Guard a Machine

DQT Long-distance Safety Light Curtain (Large Beam Count) - product photo🔍 Click to enlarge · 1/13

Technical Specifications

Curtain TypeThrough-beam (opposed mode) — separate transmitter and receiver
Safety Design BasisType 4 architecture (IEC 61496-1/-3); Category 4 (ISO 13849-1). Catalog cites EN 61496-3:2019 Type 4, EN 13849-1:2015. Certification documents available on request.
EMC CertificationHolds TÜV SÜD Attestation of Conformity No. E8A 104143 0001 (Rev. 00) for electromagnetic compatibility under EU Directive 2014/30/EU, tested to EN 61000-6-2:2005 and EN 61000-6-4:2007/A1:2011. Certificate held by Foshan DAIDISIKE; covers the DQA, DQR, DQRF, DQC, DQZ, DQE and DQT series. (This is an EMC certificate; it does not certify the machine-safety / ESPE function.)
Beam Pitch10 / 20 / 40 / 80 mm
Detection Accuracy (min. detectable object)18 / 28 / 48 / 88 mm (= beam pitch + 8 mm)
Number of BeamsUp to 72 (10 mm: 12-70; 20 mm: 6-72; 40 mm: 4-72; 80 mm: 4-32)
Protected HeightUp to ~2840 mm; = beam pitch x (number of beams - 1)
Sensing DistanceSelectable catalogue ranges: 0.3-3 / 0.3-6 / 0.3-10 / 0.3-15 / 0.3-20 / 0.3-25 / 0.3-30 / 0.3-40 m (codes A-H). Legacy text also lists 30-3000 / 30-6000 mm, conflicting at the lower limit. Confirm the exact model's minimum distance; 30 mm must not be treated as equivalent to 0.3 m.
Response Time<= 15 ms
Ambient Light Immunity10,000 lux (incidence angle >= 5 degrees)
Dimensions51 x 35 mm x L (L = transmitter / receiver length)
Enclosure RatingIP65
ControllerDQCA / DQCA2
Supply VoltageDC 12/24 V; AC 110-220 V (relay-output version)
Current Consumption<= 200 mA
OutputNPN / PNP type, sink current 500 mA, residual voltage < 1.5 V, with polarity, short-circuit and overload protection
Output StateON when beams clear (receiver indicator green)
IndicatorsTransmitter: power (red). Receiver: output — clear (green) / blocked (red)
Light SourceModulated infrared LED
ConnectionCircular aviation connector with dedicated cable
Housing MaterialAluminium alloy; end caps ABS-reinforced nylon
Operating Temperature-10 to +40 degrees C (non-condensing); storage -25 to +55 degrees C
Ambient HumidityOperating 35-85% RH; storage 35-95% RH

Overview

The DQT is the long-distance, large-beam-count member of the DAIDISIKE through-beam (opposed-mode) safety light curtain family — the same optical platform as the long-range DQA, extended to far more beam axes. A separate transmitter and receiver project a tall plane of modulated infrared beams across a wide or high opening, stopping the machine when any beam is broken. It is designed to the Type 4 architecture of IEC 61496-1 and -3 and to Category 4 of ISO 13849-1 (the catalog also cites EN 61496-3:2019 Type 4 and EN 13849-1:2015).

Where the DQA tops out at 32 beam axes, the DQT scales to 72, giving protected heights up to about 2840 mm at the coarser pitches (for example DQT72/40-2840 = 72 beams at 40 mm pitch, 2840 mm protected height). It offers four beam pitches — 10, 20, 40 and 80 mm — and, like the DQA, a sensing distance selectable by model code from 0.3-3 m up to 0.3-40 m, so one transmitter/receiver pair can guard a large danger zone.

Output is NPN or PNP, normally open or normally closed, or a relay output, selected by model code, wired via the transmitter's and receiver's aviation connectors with a single- or dual-output-signal option. The 51 x 35 mm aluminium housing is rated IP65, self-checks continuously, and rejects ambient light to 10,000 lux at an incidence angle of 5 degrees or more.

Features & Benefits

Up to 72 Beams in a Single Curtain

Beam counts reach 70 beams at 10 mm pitch (DQT70/10-690), 72 beams at 20 mm pitch (DQT72/20-1420), and 72 beams at 40 mm pitch (DQT72/40-2840). One curtain covers tall, dense protective fields that would otherwise require stacking multiple standard-range curtains.

Long-range Through-beam Detection for Wide-span Openings

DQT extends beyond DQA's 32-beam limit and is described in the catalog series overview as suitable for through-beam distances up to 40 m per the model-code table (the catalog cover mentions 50 m; confirm with us), letting one curtain span wide machine openings or long perimeter boundaries.

Four Beam-pitch Options Matched to Detection Requirement

10/20/40/80 mm beam pitches correspond to 18/28/48/88 mm minimum detectable objects, with protective height scaling accordingly - up to 690 mm at 10 mm pitch, 1420 mm at 20 mm pitch, 2840 mm at 40 mm pitch, and 2480 mm at 80 mm pitch.

Single or Dual Signal Output, 5-core or 7-core Wiring

Transistor output with a choice of single-output or dual-output signal configuration, wired via 5-core or 7-core cable, for compatibility with different control-circuit layouts.

Clear Model-number Logic for Straightforward Specification

Model numbers follow a fixed pattern - DQT + beam count + "/" + beam pitch + "-" + protective height (e.g., DQT12/10-110) - so the beam count, pitch, and protective height of any given unit can be read directly from its part number.

Purpose-built Extension Within a Structured Product Family

DQT sits in a defined family position: choose DQA for beam counts up to 32; step up to DQT when more than 32 beams are needed. This gives a clear, catalog-defined upgrade path rather than an ad hoc large-beam-count variant.

Applications

Large Hydraulic Press / Multi-station Progressive Press Guarding — Wide operator openings on large presses need a protective field taller and wider than a standard-range curtain provides; DQT's large beam count and extended protective height cover the full opening in one unit.
Robotic Welding Line / Gantry System Perimeter — Long linear boundaries around robot cells or gantry travel paths benefit from a through-beam curtain that can span the distance without intermediate cascading hardware.
Warehouse Racking Aisle / Large AGV Corridor Entry Protection — Tall, narrow aisle mouths need a full-height protective field; the 40/80 mm pitch options with protective heights up to 2840 mm and 2480 mm respectively suit these openings.
Large-format Sheet/Coil Processing Equipment Area Guarding — Wide processing lines such as paper or steel handling require boundary protection across a long span, matching DQT's long-range through-beam capability.
Replacing Multi-curtain Stacks on Oversized Openings — Where an opening exceeds a single standard curtain's beam-count ceiling of 32 beams, DQT's up-to-72-beam range can replace a multi-curtain stack with one unit, simplifying installation and alignment.

Models & Ordering Information

114 listed table entries across 4 beam-pitch options. Compare beam count and span, then confirm the complete ordering code. Beam pitch alone does not establish detection capability or suitability for personnel protection.

Beam pitch 10 mm; protective height range 110-690 mm

DQT Long-distance Safety Light Curtain (Large Beam Count) — 10 mm beam pitch, 30 listed entries
Listed model entryBeam pitch K (mm)Number of beams NBeam span H (mm)
DQT12/10-1101012110
DQT14/10-1301014130
DQT16/10-1501016150
DQT18/10-1701018170
DQT20/10-1901020190
DQT22/10-2101022210
DQT24/10-2301024230
DQT26/10-2501026250
DQT28/10-2701028270
DQT30/10-2901030290
DQT32/10-3101032310
DQT34/10-3301034330
DQT36/10-3501036350
DQT38/10-3701038370
DQT40/10-3901040390
DQT42/10-4101042410
DQT44/10-4301044430
DQT46/10-4501046450
DQT48/10-4701048470
DQT50/10-4901050490
DQT52/10-5101052510
DQT54/10-5301054530
DQT56/10-5501056550
DQT58/10-5701058570
DQT60/10-5901060590
DQT62/10-6101062610
DQT64/10-6301064630
DQT66/10-6501066650
DQT68/10-6701068670
DQT70/10-6901070690

30 listed entries at 10 mm pitch · 114 across this table. Beam span is calculated as H = (N − 1) × K; it is not overall housing length or proof of detection capability. Some entries expand catalogue ranges. Confirm the complete ordering code and availability before ordering; inclusion is not a stock claim.

How to read the DQT model code

DQT [beams] / [pitch] - [protected height] [output groups] [signal] [sensing distance]
DQT = series. [beams] = 04, 06, 08 … 72. [pitch] = 10/20/40/80 mm. [protected height] in mm = pitch x (beams - 1). [output groups] = blank for one group, 2 for two groups. [signal] = A (NPN NC), B (PNP NC), C (NPN NO), D (PNP NO), J (relay). [sensing distance] = A (0.3-3 m), B (0.3-6 m), C (0.3-10 m), D (0.3-15 m), E (0.3-20 m), F (0.3-25 m), G (0.3-30 m), H (0.3-40 m). Example: DQT48/40-1880 1 D A = 48 beams, 40 mm pitch, 1880 mm protected height, single output, PNP NO, 0.3-3 m sensing distance.

How the DQT differs from the DQA

DQT = 4 pitches, up to 72 beamsDQA = 8 pitches, up to 32 beams
The DQT and DQA share the same long-range through-beam platform (51 x 35 mm housing, sensing distance to 0.3-40 m, <= 15 ms response, Type 4 / Category 4 design). The DQA offers eight beam pitches (down to 10 mm) but a maximum of 32 beams; the DQT offers four pitches (10/20/40/80 mm) but scales to 72 beams for taller or wider protected fields. Choose DQA for finer pitch / shorter field, DQT for a very tall or wide field.

PDF & 3D CAD Downloads

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3D CAD MODELS

Find the file for your exact model

Open the download center with this series selected. Search the full model, check the file details, and download the matching CAD file.

Find a CAD Model

Confirm the document and CAD file match the exact ordered version before installation or mechanical design. Contact us if your model is not listed.

How to Select

  1. Match the required minimum detectable object to the published 18/28/48/88 mm detection values for the 10/20/40/80 mm pitches. Do not select a 10 mm-pitch DQT as a 14 mm finger-detection device.
  2. Decide the required protective height, then read it off the model list for the chosen pitch: 10 mm pitch runs DQT12/10-110 through DQT70/10-690, 20 mm pitch runs DQT06/20-100 through DQT72/20-1420, 40 mm pitch runs DQT04/40-120 through DQT72/40-2840, and 80 mm pitch runs DQT04/80-240 through DQT32/80-2480.
  3. Read the model number directly: DQT + beam count + "/" + beam pitch + "-" + protective height - for example DQT70/10-690 means 70 beams, 10 mm pitch, 690 mm protective height.
  4. Choose the output configuration: transistor output with single or dual signal output, per your control-circuit requirement.
  5. Choose the wiring: 5-core or 7-core cable, matched to your controller/interface requirement.
  6. For beam counts up to 32 beams at long through-beam range choose DQA; for more than 32 beams choose DQT; DQT4 is a separate catalog series with its own beam-pitch and wiring pattern and should not be confused with DQT.

📘 Need the full method? How to Choose a Safety Light Curtain · Type 2 vs Type 4 Safety Light Curtains

When NOT to specify the DQT — and what to use instead

You need a finer beam pitch such as 14, 25 or 30 mm

Why not: The DQT offers only four pitches — 10, 20, 40 and 80 mm. The intermediate 14, 25 and 30 mm pitches are not on the DQT.

Use instead: The DQA long-range curtain, which offers eight pitches (10/14/20/25/30/40/80/200 mm) on the same platform, up to 32 beams.

The protected field needs 32 beams or fewer

Why not: The DQT is built for large beam counts (up to 72). For a modest field its extra length and cost are not needed.

Use instead: The DQA (up to 32 beams, more pitch choices) for a shorter field, or the standard-range DQC for a short span.

You need true 14 mm finger detection capability

Why not: The finest DQT pitch is 10 mm, giving a detection accuracy — minimum detectable object — of 18 mm (pitch + 8 mm), a hand-level rather than a strict 14 mm finger figure.

Use instead: Compare the DQT4 catalogue's 7.5 mm-pitch / 14 mm-detection configuration or another suitable series, then verify the exact ordered model, safety documentation and application assessment. Do not assume every DQT4 pitch has 14 mm detection capability.

Washdown, high-pressure hosing or wet environments

Why not: The DQT housing is rated IP65 — dust-tight and protected against low-pressure water jets, but not high-pressure jetting or immersion.

Use instead: The DQR / DQRF waterproof safety light curtain series for wet or washdown areas.

Ambient temperature outside -10 to +40 degrees C, or condensing conditions

Why not: The DQT operating range is -10 to +40 degrees C, non-condensing. Outside that band, or where the optical faces can condense or ice, detection is not guaranteed.

Use instead: A heated or sheltered enclosure that holds the curtain within spec, or confirm a wide-temperature option with us.

The machine control needs a volt-free relay output but an NPN/PNP variant was ordered

Why not: Output type is fixed by the model code letter (A/B/C/D = NPN/PNP solid-state, J = relay) and cannot be changed in the field.

Use instead: Order the J (relay-output) variant, or the matching A/B/C/D code for the sinking/sourcing and NO/NC logic your controller expects.

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

  • PFHd, MTTFd and DCavg figures needed to integrate the DQT into a full ISO 13849-1 machine calculation. The catalog states Category 4 but does not publish these numbers.
  • Safety-distance calculation guidance (ISO 13855) and the exact response time per beam count — the catalog gives only the <= 15 ms maximum, and response time typically rises with beam count.
  • Machine-safety (ESPE) certification: the TÜV SÜD certificate on file (E8A 104143 0001) covers EMC (Directive 2014/30/EU) only. An IEC 61496 EU-Type Examination certificate from a notified body — the document that would substantiate a Type 4 / Category 4 safety-function claim — and any UL listing are not yet on hand. Certification documents available on request.
  • The difference between the DQCA and DQCA2 controllers, and which configurations require an external controller.
  • Muting and fixed / floating blanking function availability and configuration.
  • Maximum protected height / longest housing available, and any beam-count limit beyond 72.
  • Cable length options and the aviation-connector pinout.

Frequently Asked Questions

What is the maximum beam count available in the DQT series?
Up to 72 beams - reached at both 20 mm pitch (DQT72/20-1420) and 40 mm pitch (DQT72/40-2840). The 10 mm pitch option tops out at 70 beams (DQT70/10-690), and the 80 mm pitch option tops out at 32 beams (DQT32/80-2480).
What beam pitch options does DQT offer?
Four beam-pitch options: 10, 20, 40 and 80 mm. Their published minimum detectable objects are 18, 28, 48 and 88 mm respectively; pitch and detection resolution are different specifications.
What is the maximum protective height available?
2840 mm, at the 40 mm pitch option (model DQT72/40-2840).
How do I read a DQT model number?
The format is DQT + beam count + "/" + beam pitch (mm) + "-" + protective height (mm). For example, DQT12/10-110 has 12 beams, 10 mm pitch, and 110 mm protective height.
What output types does DQT support?
Transistor output, with a choice of single-output or dual-output signal configuration.
What wiring options are available?
5-core or 7-core cable connection, depending on configuration and controller requirement.
When should I choose DQT instead of DQA?
DQA covers beam counts up to 32 beams at long through-beam range. When more than 32 beams are required, DQT is the extension series for the same long-range through-beam application.
Is DQT the same series as DQT4?
No. DQT (this series) is the large-beam-count extension of the long-range through-beam DQA family. DQT4 is a separate catalog series with its own beam-pitch and wiring pattern. The similar naming can cause confusion - they are not interchangeable.
What is the maximum through-beam detection distance for DQT?
The DQT sensing distance is selectable by model code up to 0.3-40 m (code H). The catalog series overview mentions up to 50 m, but the model-code table stops at 0.3-40 m, so confirm the maximum orderable distance with us before designing it in.
Are certification documents available for the DQT series?
Certification documents are available on request.

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