DQBT Ultra-thin Optical-sync Safety Light Curtain

Name: DQBT Ultra-thin Optical-sync Safety Light Curtain
Brand: DAIDISIKE
SKU: dqbt-ultra-thin-optical-sync-safety-light-curtain
Availability: InStock

Ultra-thin safety light curtain with optical sync between emitter and receiver — no interconnecting sync cable — in 10/20/40 mm beam pitch, transistor NPN/PNP output, 0.3-3 m detection distance.

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DQBT Ultra-thin Optical-sync Safety Light Curtain - product photo

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Technical Specifications

Series	DQBT Ultra-thin Optical-sync Safety Light Curtain
Curtain Type	Through-beam (opposed mode) -- separate emitter and receiver, synchronized optically
Synchronization	Optical synchronization -- no interconnecting sync cable between emitter and receiver
Beam Pitch	10 / 20 / 40 mm
Number of Beams	8-100 (10 mm pitch, step 2); 6-198 printed cleanly, table extends to a 200-beam-equivalent row (20 mm pitch, step 2 -- see modelGroups note on a model-number print inconsistency at the top of this range); 4-24 printed cleanly, table extends to a 200-beam-equivalent row (40 mm pitch, step 2 -- see modelGroups note on a print inconsistency above 24 beams)
Protected Height	70-990 mm (10 mm pitch); 100-3940 mm printed cleanly, up to 3980 mm per table (20 mm pitch); 120-920 mm printed cleanly, up to 7960 mm per table (40 mm pitch). Protected height = pitch x (beam count - 1)
Detection / Sensing Distance	0.3-3 m for every configuration listed in the DQBT spec table (no selectable long-range code)
Response Time	<= 15 ms (catalog feature list also markets this as "0.01 second" fast response)
Output	Transistor output, NPN or PNP, NC or NO, selected by code: A = NPN NC, B = PNP NC, C = NPN NO, D = PNP NO
Wiring	Emitter/transmitter: 3-core (shield, 0V, +12-24VDC). Receiver: 5-core (shield, 0V, +12-24VDC, OSSD1, OSSD2)
Interference Immunity	Catalog states shielding of approximately 99% of interference signals; stated resistance to electromagnetic interference, strobe lighting and welding arc light
Self-check / Protection	Continuous self-check; polarity, short-circuit and overload protection, per the catalog
Housing Cross-section	15 mm x 30 mm per the DQBT dimension drawing (the same drawing separately labels one width callout as 15.6 mm; both figures are transcribed as printed)
Curtain Length Formula	L (total curtain length, mm) = P + H + J + 12 + 12, where H = protected height. P = 5mm / J = 10mm at 10mm pitch; P = 15mm / J = 10mm at 20mm and 40mm pitch. Z (mounting hole center distance) = L - 11mm
Connector	Optional M12 aviation connector, 30 x 15 mm design, per the catalog feature list
Construction	Surface-mount (SMT) electronics, stated by the catalog to improve vibration resistance
Design / Test Basis	IEC 61496-1/2 safety level; EN13849-1:2015; EN61496-3:2019; management-system certification GB/T19001-2016 idt ISO9001:2015 (quality management, not a product safety certificate), per the catalog. The same feature list names TÜV and UL; no certificate numbers or a Type/Category/PLe/SIL architecture level are stated for DQBT. Certification documents are available on request.

Overview

DQBT is DAIDISIKE's ultra-thin safety light curtain built around optical synchronization: the emitter and receiver lock together using an optical signal instead of a wired sync line, so each tower only needs its own local power/output wiring. The catalog positions it for hydraulic presses, oil presses, shearing machines, injection molding machines, and other equipment or installation spaces where running a cross-machine sync cable is impractical.

The series is offered in three beam pitches — 10, 20 and 40 mm — with beam counts and protected heights tabulated per pitch in the catalog's DQBT spec sheet. Every configuration in that table carries the same 0.3-3 m detection/sensing distance; DQBT does not offer the long-range, code-selectable distance option that the DQA series does.

Output is transistor-type, NPN or PNP, normally open or normally closed (catalog codes A/B/C/D), wired 3-core on the emitter side and 5-core on the receiver side. The catalog states the unit shields about 99% of interference signals, includes continuous self-check plus polarity/short-circuit/overload protection, uses surface-mount electronics, and offers an optional M12 aviation-connector interface (30 x 15 mm).

Key Facts — DQBT at a glance

DQBT's emitter and receiver synchronize via an optical signal instead of a wired sync cable — the catalog's feature list states "采用光同步技术" (optical synchronization technology), and the DQBT wiring diagram shows only local power/output wiring on each side, with no sync wire running between the two towers.
DQBT is offered in three beam pitches per the catalog's own DQBT spec tables: 10 mm, 20 mm and 40 mm.
At 10 mm pitch, DQBT's spec table runs cleanly from an 8-beam unit (DQBT08/10-70, 70 mm protected height) to a 100-beam unit (DQBT100/10-990, 990 mm protected height), in steps of 2 beams.
At 20 mm pitch, the table runs from 6 beams (DQBT06/20-100) up through 198 beams (DQBT198/20-3940); a further row lists 3980 mm protected height (i.e., 200 beams by the series' own H = pitch x (beams-1) formula) but its printed model number reads "DQBT100/20-3980" rather than the expected DQBT200 — the exact top-end model number needs confirming.
At 40 mm pitch, the table runs from 4 beams (DQBT04/40-120) to 24 beams (DQBT24/40-920) with the full "DQBT" prefix printed correctly, then continues in a second column from 26 to 200 beams (1000 mm up to 7960 mm protected height) — but every row in that second column omits the leading "D" (printed as "QBT26/40-1000" through "QBT200/40-7960"), so exact model numbers for these higher-beam-count units need confirming with the factory.
Every configuration listed in DQBT's own spec table carries the same detection/sensing distance: 0.3-3 m. Unlike the DQA series, there is no selectable long-range distance code.
DQBT response time is <=15 ms per the spec sheet; the same catalog page also markets this figure as "0.01-second fast response" in its features list.
DQBT wiring, per the catalog's own DQBT wiring diagram, is 3-core on the emitter/transmitter side (shield, 0V, +12-24VDC) and 5-core on the receiver side (shield, 0V, +12-24VDC, OSSD1, OSSD2).
DQBT uses transistor output, NPN or PNP, normally closed or normally open, selected by catalog code: A = NPN NC, B = PNP NC, C = NPN NO, D = PNP NO.
The catalog states DQBT shields about 99% of interference signals and is resistant to electromagnetic interference, strobe lighting and welding arc light; it also states continuous self-check plus polarity, short-circuit and overload protection so a faulted unit will not send an erroneous signal to the controlled equipment.
The DQBT catalog page states design/test compliance with IEC 61496-1/2 safety level, EN13849-1:2015, EN61496-3:2019, and management-system certification GB/T19001-2016 idt ISO9001:2015, and names TÜV and UL in its feature list; no certificate numbers or a stated Type/Category/PLe/SIL architecture level are given for DQBT specifically. Certification documents are available on request.

Features & Benefits

Optical Synchronization — No Interconnecting Cable

Emitter and receiver synchronize via an optical signal instead of a wired sync line, so each side only needs local power/signal wiring. There is no cross-machine cable run to install, route or later repair.

Minimal 3-Wire Hook-up Per Side

Wiring terminates in 3-core or 5-core cable per side, keeping field wiring simple for panel builders and installers.

Up to 100 Beams at 10mm Pitch

The 10mm-pitch range runs from DQBT08/10-70 to DQBT100/10-990, giving fine-resolution detection over a tall protected height in a single unit rather than stacking multiple curtains.

NPN/PNP Selectable Output

Output logic can be selected to match the customer's existing control/PLC input wiring convention (sinking or sourcing), simplifying integration into different control panels.

Three Pitch Options for Fine-to-Coarse Detection

10mm, 20mm and 40mm beam pitch are available, letting the same series serve applications from finger-level fine detection down to coarser hand/body detection without switching product families.

Slim, Low-Profile Housing

DQBT is positioned in the catalogue as an ultra-thin series, suited to installations where a compact housing cross-section is needed to fit tight mechanical envelopes.

Applications

Conveyor Crossover Guarding — Emitter and receiver often sit on opposite sides of a conveyor or aisle, belonging to different frames; optical sync removes the need to route a cable across the moving line.

High-Opening Guarding on AS/RS or Elevators — The 10mm-pitch range's high beam count (up to 100 beams, protected height up to 990mm) supports tall openings in a single unit without cascading.

Safety Retrofits on Existing Lines — Where the machine frame cannot be modified for new cable channels or openings, optical sync avoids the civil/electrical work a wired-sync curtain would require.

Space- and Wiring-Constrained Machine Openings (e.g. Injection Molding Machines) — A slim housing combined with wiring-free sync suits openings where both the mechanical footprint and the cable routing are tightly constrained.

Multi-Frame Automated Cells Requiring Independent Panel Wiring — Since each side only needs local 3-core/5-core wiring, emitter and receiver towers mounted on separate equipment frames can be wired to their own local panel independently.

Models & Ordering Information

6 standard models across 3 beam-pitch options. Select the pitch your risk assessment calls for, then the protective height that covers the opening.

Beam count runs 8 to 100 in steps of 2, printed cleanly in the catalog; protected height (mm) = (beam count - 1) x 10. Detection/sensing distance is 0.3-3 m for every row.

DQBT Ultra-thin Optical-sync Safety Light Curtain — 10 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQBT08/10-70	10	8	70
DQBT100/10-990	10	100	990

DQBT Ultra-thin Optical-sync Safety Light Curtain — 20 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQBT06/20-100	20	6	100
DQBT198/20-3940	20	198	3940

DQBT Ultra-thin Optical-sync Safety Light Curtain — 40 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQBT04/40-120	40	4	120
DQBT24/40-920	40	24	920

2 standard models at 10 mm pitch · 6 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 DQBT model code

DQBT [beam count] / [pitch] - [protected height]

DQBT = series (ultra-thin, optical sync). [beam count] = number of beam axes. [pitch] = 10, 20 or 40 mm. [protected height] in mm = pitch x (beam count - 1). Output logic is selected separately by code, per the catalog's DQBT signal-output diagram: A = NPN NC, B = PNP NC, C = NPN NO, D = PNP NO. Detection/sensing distance is fixed at 0.3-3 m across every DQBT configuration in the catalog -- there is no long-range distance code as in the DQA series. Example: DQBT20/10-190 = 20 beams, 10 mm pitch, 190 mm protected height.

How to Select

Pick beam pitch by required detection resolution: 10mm for the finest, finger-level detection; 20mm for medium detection; 40mm for coarser hand/body-level detection.
Within the chosen pitch, select the beam count whose protected height matches the opening or passage to be guarded.
Select NPN or PNP output to match the sinking or sourcing input convention of the existing PLC or safety control panel.
Confirm 3-core or 5-core wiring based on whether the installation needs additional local functions beyond basic power/signal.
Because synchronization is optical, no cable routing needs to be reserved between the emitter and receiver towers — only local power/signal wiring is needed on each side.

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

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

Routing a sync cable between the emitter and receiver is easy and cost is not a concern

Why not: Optical synchronization is a wiring-convenience feature, not an added protection function -- a standard wired-sync ultra-thin curtain covers the same detection duty and is a more conventional, field-proven interconnect.

Use instead: The DQB ultra-thin safety light curtain (wired sync) where a sync cable run is not a constraint.

The mounting geometry calls for a front-emitting beam layout rather than end-to-end through-beam towers

Why not: DQBT is a standard through-beam (opposed-mode) curtain per the catalog's own dimension and wiring drawings -- it is not a front-emitting design.

Use instead: The DQZ front-emitting safety light curtain series.

The transmitter-to-receiver span exceeds about 3 m

Why not: Every configuration in DQBT's own spec table lists a 0.3-3 m detection/sensing distance, with no selectable long-range code (unlike DQA, which offers coded options up to 0.3-40 m).

Use instead: The DQA long-distance safety light curtain series for spans beyond 3 m.

The installation involves washdown, high-pressure hosing, or outdoor/wet exposure

Why not: The DQBT catalog pages read do not state an IP/environmental protection rating for DQBT itself. (The IP65 figure visible in a product photo on the DQBT feature page belongs to a nameplate that reads "DQB", not DQBT, so it is not carried over as a DQBT spec.)

Use instead: The DQR waterproof safety light curtain series for wet or washdown areas, or confirm an IP rating for DQBT with the factory before specifying it outdoors.

Detection resolution finer than 10 mm pitch is required

Why not: The finest beam pitch DQBT offers is 10 mm; no finer pitch is listed for this series in the catalog pages read.

Use instead: Confirm with the factory whether a finer-pitch series is available, or verify the 10 mm pitch (and its actual minimum detectable object size) meets your risk assessment.

The application needs a confirmed operating temperature/humidity range or a stated supply voltage and current draw

Why not: The DQBT pages read do not state an operating temperature/humidity range, supply voltage or current consumption for this series (unlike DQA, which publishes -10 to +40 degrees C and DC 12/24V / 200mA).

Use instead: Confirm these figures with the factory before specifying DQBT for temperature-extreme or precisely power-budgeted installations.

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.

IP/environmental protection rating for DQBT itself is not stated in the current catalog, so we do not assert IP65 for DQBT
Operating temperature range, storage temperature, and humidity specifications for DQBT are not given in the current catalog.
Supply voltage and current consumption for DQBT are not stated in the current catalog
TÜV and UL certificate numbers, and the exact Type/Category/PLe/SIL safety architecture level, are not stated for DQBT -- the catalog names IEC61496-1/2, EN13849-1:2015, EN61496-3:2019 and GB/T19001-2016 idt ISO9001:2015, but (unlike the DQT4 page, which explicitly states Type 4 / Cat.4 / PLe / SIL3) does not give a Type/Category/PLe/SIL rating for DQBT. Certification documents are available on request.
PFHd, MTTFd and DCavg figures needed to integrate DQBT into a full ISO 13849-1 machine safety calculation are not published in the current catalog.
Exact order codes for the highest-beam-count configurations (200 beams at 20 mm pitch; 26-200 beams at 40 mm pitch) — ask us to confirm the exact model number before ordering
Cable length options and the aviation-connector pinout beyond the optional M12, 30x15mm connector note are not detailed in the current catalog.
Housing and end-cap material for DQBT are not stated in the current catalog (contrast with DQA, which states aluminium alloy housing with ABS-reinforced nylon end caps).

Frequently Asked Questions

What makes the DQBT different from a standard wired-sync safety light curtain?

The DQBT synchronizes the emitter and receiver optically instead of through a wired sync cable. Each side is wired independently (3-core or 5-core) to its own local power/signal supply, and there is no interconnecting cable to route between the two towers.

Do I still need to run any cable between the emitter and receiver?

No signal/sync cable is needed between the emitter and receiver — synchronization is achieved optically. Each side only requires its own local wiring for power and output signal.

What beam pitch (resolution) options does DQBT offer?

Three pitch options: 10mm, 20mm and 40mm, corresponding to different detection object sizes and beam-count ranges.

What is the maximum number of beams available?

The 10mm-pitch range goes up to 100 beams (DQBT100/10-990). The 20mm-pitch and 40mm-pitch ranges have their own beam-count ranges — see the model list.

What output types does DQBT support?

Transistor output with NPN or PNP signal selectable, so it can be matched to different PLC/control panel input wiring conventions.

How is the DQBT model number structured?

DQBT + number of beams + "/" + beam pitch in mm + "-" + protected height in mm. For example, DQBT08/10-70 means 8 beams, 10mm pitch, 70mm protected height.

How many wires does DQBT use?

3-core or 5-core cable per side.

Can DQBT be used where the emitter and receiver are mounted on different equipment frames?

Yes — because each side is wired and synchronized independently via the optical link, DQBT is well suited to installations where the emitter and receiver sit on separate frames, such as across a conveyor or aisle.

What certifications does DQBT carry?

Certification documents are available on request.