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

Name: DQT Long-distance Safety Light Curtain (Large Beam Count)
Brand: DAIDISIKE
SKU: dqt-long-distance-safety-light-curtain
Availability: InStock

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

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Technical Specifications

Curtain Type	Through-beam (opposed mode) — separate transmitter and receiver
Safety Design Basis	Type 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 Certification	Holds 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 Pitch	10 / 20 / 40 / 80 mm
Detection Accuracy (min. detectable object)	18 / 28 / 48 / 88 mm (= beam pitch + 8 mm)
Number of Beams	Up to 72 (10 mm: 12-70; 20 mm: 6-72; 40 mm: 4-72; 80 mm: 4-32)
Protected Height	Up to ~2840 mm; = beam pitch x (number of beams - 1)
Sensing Distance	Selectable by model code: 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). Base configurations 30-3000 mm and 30-6000 mm.
Response Time	<= 15 ms
Ambient Light Immunity	10,000 lux (incidence angle >= 5 degrees)
Dimensions	51 x 35 mm x L (L = transmitter / receiver length)
Enclosure Rating	IP65
Controller	DQCA / DQCA2
Supply Voltage	DC 12/24 V; AC 110-220 V (relay-output version)
Current Consumption	<= 200 mA
Output	NPN / PNP type, sink current 500 mA, residual voltage < 1.5 V, with polarity, short-circuit and overload protection
Output State	ON when beams clear (receiver indicator green)
Indicators	Transmitter: power (red). Receiver: output — clear (green) / blocked (red)
Light Source	Modulated infrared LED
Connection	Circular aviation connector with dedicated cable
Housing Material	Aluminium alloy; end caps ABS-reinforced nylon
Operating Temperature	-10 to +40 degrees C (non-condensing); storage -25 to +55 degrees C
Ambient Humidity	Operating 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.

Key Facts — DQT at a glance

The DQT is designed to the Type 4 architecture of IEC 61496-1/-3 and to Category 4 of ISO 13849-1, as stated in the DAIDISIKE light-curtain catalog. Certification documents are available on request.
The DQT is covered by TÜV SÜD Attestation of Conformity No. E8A 104143 0001 for electromagnetic compatibility (EU EMC Directive 2014/30/EU), tested to EN 61000-6-2:2005 and EN 61000-6-4:2007/A1:2011.
The DQT scales to 72 beam axes — more than double the DQA's 32 — giving protected heights up to about 2840 mm (for example DQT72/40-2840 = 72 beams, 40 mm pitch, 2840 mm protected height).
The DQT offers four beam pitches — 10, 20, 40 and 80 mm — with a corresponding detection accuracy (minimum detectable object) of 18, 28, 48 and 88 mm (pitch + 8 mm).
The DQT sensing distance is selectable by model code across eight steps — 0.3-3, 0.3-6, 0.3-10, 0.3-15, 0.3-20, 0.3-25, 0.3-30 and 0.3-40 m (codes A to H) — the same long-range span as the DQA.
The DQT response time is 15 ms or less, and it rejects ambient light up to 10,000 lux at an incidence angle of 5 degrees or greater.
The DQT output is NPN or PNP (normally open or normally closed) or a relay output, selected by model code (A = NPN NC, B = PNP NC, C = NPN NO, D = PNP NO, J = relay), with sink current 500 mA and residual voltage under 1.5 V.
The DQT runs on DC 12/24 V, or AC 110-220 V on the relay-output version, drawing 200 mA or less, in a 51 x 35 mm aluminium housing rated IP65 over an operating range of -10 to +40 degrees C (non-condensing).

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 pitch lets the curtain be matched to finger-, hand-, arm/body-level detection needs, 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 standard models across 4 beam-pitch options. Select the pitch your risk assessment calls for, then the protective height that covers the opening.

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

DQT Long-distance Safety Light Curtain (Large Beam Count) — 10 mm beam pitch, 30 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQT12/10-110	10	12	110
DQT14/10-130	10	14	130
DQT16/10-150	10	16	150
DQT18/10-170	10	18	170
DQT20/10-190	10	20	190
DQT22/10-210	10	22	210
DQT24/10-230	10	24	230
DQT26/10-250	10	26	250
DQT28/10-270	10	28	270
DQT30/10-290	10	30	290
DQT32/10-310	10	32	310
DQT34/10-330	10	34	330
DQT36/10-350	10	36	350
DQT38/10-370	10	38	370
DQT40/10-390	10	40	390
DQT42/10-410	10	42	410
DQT44/10-430	10	44	430
DQT46/10-450	10	46	450
DQT48/10-470	10	48	470
DQT50/10-490	10	50	490
DQT52/10-510	10	52	510
DQT54/10-530	10	54	530
DQT56/10-550	10	56	550
DQT58/10-570	10	58	570
DQT60/10-590	10	60	590
DQT62/10-610	10	62	610
DQT64/10-630	10	64	630
DQT66/10-650	10	66	650
DQT68/10-670	10	68	670
DQT70/10-690	10	70	690

DQT Long-distance Safety Light Curtain (Large Beam Count) — 20 mm beam pitch, 34 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQT06/20-100	20	6	100
DQT08/20-140	20	8	140
DQT10/20-180	20	10	180
DQT12/20-220	20	12	220
DQT14/20-260	20	14	260
DQT16/20-300	20	16	300
DQT18/20-340	20	18	340
DQT20/20-380	20	20	380
DQT22/20-420	20	22	420
DQT24/20-460	20	24	460
DQT26/20-500	20	26	500
DQT28/20-540	20	28	540
DQT30/20-580	20	30	580
DQT32/20-620	20	32	620
DQT34/20-660	20	34	660
DQT36/20-700	20	36	700
DQT38/20-740	20	38	740
DQT40/20-780	20	40	780
DQT42/20-820	20	42	820
DQT44/20-860	20	44	860
DQT46/20-900	20	46	900
DQT48/20-940	20	48	940
DQT50/20-980	20	50	980
DQT52/20-1020	20	52	1020
DQT54/20-1060	20	54	1060
DQT56/20-1100	20	56	1100
DQT58/20-1140	20	58	1140
DQT60/20-1180	20	60	1180
DQT62/20-1220	20	62	1220
DQT64/20-1260	20	64	1260
DQT66/20-1300	20	66	1300
DQT68/20-1340	20	68	1340
DQT70/20-1380	20	70	1380
DQT72/20-1420	20	72	1420

DQT Long-distance Safety Light Curtain (Large Beam Count) — 40 mm beam pitch, 35 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQT04/40-120	40	4	120
DQT06/40-200	40	6	200
DQT08/40-280	40	8	280
DQT10/40-360	40	10	360
DQT12/40-440	40	12	440
DQT14/40-520	40	14	520
DQT16/40-600	40	16	600
DQT18/40-680	40	18	680
DQT20/40-760	40	20	760
DQT22/40-840	40	22	840
DQT24/40-920	40	24	920
DQT26/40-1000	40	26	1000
DQT28/40-1080	40	28	1080
DQT30/40-1160	40	30	1160
DQT32/40-1240	40	32	1240
DQT34/40-1320	40	34	1320
DQT36/40-1400	40	36	1400
DQT38/40-1480	40	38	1480
DQT40/40-1560	40	40	1560
DQT42/40-1640	40	42	1640
DQT44/40-1720	40	44	1720
DQT46/40-1800	40	46	1800
DQT48/40-1880	40	48	1880
DQT50/40-1960	40	50	1960
DQT52/40-2040	40	52	2040
DQT54/40-2120	40	54	2120
DQT56/40-2200	40	56	2200
DQT58/40-2280	40	58	2280
DQT60/40-2360	40	60	2360
DQT62/40-2440	40	62	2440
DQT64/40-2520	40	64	2520
DQT66/40-2600	40	66	2600
DQT68/40-2680	40	68	2680
DQT70/40-2760	40	70	2760
DQT72/40-2840	40	72	2840

DQT Long-distance Safety Light Curtain (Large Beam Count) — 80 mm beam pitch, 15 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQT04/80-240	80	4	240
DQT06/80-400	80	6	400
DQT08/80-560	80	8	560
DQT10/80-720	80	10	720
DQT12/80-880	80	12	880
DQT14/80-1040	80	14	1040
DQT16/80-1200	80	16	1200
DQT18/80-1360	80	18	1360
DQT20/80-1520	80	20	1520
DQT22/80-1680	80	22	1680
DQT24/80-1840	80	24	1840
DQT26/80-2000	80	26	2000
DQT28/80-2160	80	28	2160
DQT30/80-2320	80	30	2320
DQT32/80-2480	80	32	2480

30 standard models at 10 mm pitch · 114 across the series. Protective height is derived as H = (N − 1) × K. Intermediate beam counts can usually be built to order — send the opening height you need to cover.

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.

How to Select

Decide the beam pitch needed: 10 mm for finger-level detection, 20 mm for hand-level detection, 40 mm for arm/body-level detection, or 80 mm for the coarsest, tallest-height option.
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.
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.
Choose the output configuration: transistor output with single or dual signal output, per your control-circuit requirement.
Choose the wiring: 5-core or 7-core cable, matched to your controller/interface requirement.
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: Confirm the required detection capability against your ISO 13855 risk assessment; the DQT4 series or a finer-resolution curtain if 14 mm finger detection is mandatory.

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 options: 10 mm, 20 mm, 40 mm, and 80 mm, corresponding to finger-, hand-, and arm/body-level detection resolution.

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.