DQT4 Type-4 Safety Light Curtain

Technical Specifications

Overview

DQT4 is a series of opto-electronic safety light curtains, named per the catalogue as the "4级安全光幕" ("Level 4") series in our range. The catalogue documents it as designed to the Type 4 architecture of EN/IEC 61496-1/-2 and GB/T 19436-1/-2, and to PLe / Category 4 of ISO 13849-1 (SIL3 per the same reference). It uses a 9-pin wiring interface and is available in three beam-pitch grades — 7.5 mm, 15 mm, and 30 mm — with a corresponding detection accuracy (minimum detectable object, per the catalogue's own parameter table) of 14 mm, 21 mm, and 36 mm respectively, described in the catalogue as finger, hand, and arm/body protection. It is intended for machine builders, panel integrators, and end users who need to guard press brakes, punch/stamping presses, and automated cells with a light curtain rather than mechanical guarding. Certification documents are available on request.

The series offers the finest beam pitch and the widest beam-count/height range in our light-curtain lineup: a 7.5 mm pitch (14 mm detection accuracy) at the fine end, and configurable protective heights from 90 mm up to 5970 mm at the large end. The 7.5 mm grade spans 15 to 319 beams (step 8), the 15 mm grade spans 8 to 200 beams (step 4), and the 30 mm grade offers a standalone 4-beam model plus 8 to 200 beams (step 4), letting a single series cover point-of-operation guarding from precision stamping to large machine perimeter access. Up to three DQT4 units can be cascaded, and each unit provides dual independent, self-diagnosing OSSD outputs.

Beam Pitch Is Not the Minimum Detectable Object

For DQT4 15/7.5-105, 7.5 is beam pitch and 105 mm is protective height; the detection figure is 14 mm. Safety Type, detection capability and protective distance are different checks. The catalogue design-basis statement is not a substitute for the certificate scope of the exact ordered configuration.

Confirm the Complete DQT4 Order and Safety Evidence

• Provide the full model, pitch/detection requirement, protective height, installed TX-RX distance, quantity and mounting arrangement.
• Confirm NPN/PNP output, receiving-controller compatibility, 9-pin cable/pinout and any controller, cascade, reset, EDM, muting or blanking option. Do not assume optional functions are present on every model.
• Request the exact-model certificate/declaration scope and safety data required for the machine file. Include total stopping-time and protective-distance validation in the integration plan.
• Ask the quotation to list brackets, cables, accessories, required documents, destination and lead time before placing the order.

Send the DQT4 full model and application requirements for configuration confirmation.

Features & Benefits

Applications

Models & Ordering Information

138 listed table entries across 3 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.

How to Select

1. Compare the 7.5 mm beam-pitch grade against a required 14 mm minimum detectable object; available beam counts are 15 to 319 (step 8). Do not use 7.5 mm as the detection capability or infer the protective distance from pitch alone.
2. Compare the 15 mm beam-pitch grade against a required 21 mm minimum detectable object; available beam counts are 8 to 200 (step 4).
3. Compare the 30 mm beam-pitch grade against a required 36 mm minimum detectable object; available as a standalone 4-beam/90 mm model or 8 to 200 beams (step 4).
4. Match protective height and the full approach-path layout to the opening. Beam count and height are fixed together per pitch grade; body-part labels do not replace the machine risk assessment.
5. All DQT4 models use a 9-pin wiring interface; output-signal details should be confirmed with the factory before final specification.
6. Select mounting accessories: the DQT4-09 end-mounting kit ships as standard, with DQCA-01/02/03/05 general-purpose brackets compatible where an alternative mounting geometry is needed.
7. If considering DQSRN or DA31 as a separate control-chain item, confirm its exact input configuration, DQT4 output compatibility and the required safety evidence. A shared supplier or catalogue is not proof of a validated combination.

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

When NOT to specify the DQT4 — and what to use instead

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 and DCavg figures for a full ISO 13849-1 / IEC 61508 machine-safety calculation. The catalogue states PLe / Category 4 / SIL3 and an MTTFd of 99 years, but does not publish PFHd or DCavg.
• Certificate issuer, certificate numbers and exact scope for the ordered DQT4 configuration; request applicable documents rather than inferring certification from the catalogue's design-basis statement.
• ISO 13855 safety-distance calculation guidance and the exact response time per beam count — the catalogue gives only the <= 20 ms overall maximum.
• Relay (volt-free) output availability — the parameter table documents NPN/PNP transistor output only; whether a relay-output variant exists for DQT4 (as the "J" code does for other series in the catalogue) needs confirming.
• Whether the 0.3-6 m sensing-distance option (model-code letter C) is actually orderable for every beam-count/pitch combination, since the full model list in the catalogue prints only "0.3-3 m" for every row shown.
• The difference between the DQCA and DQCA2 controllers, and which DQT4 configurations require an external controller versus operating stand-alone.
• Cable length options and the full 9-pin aviation-connector pinout, beyond the two wiring examples documented (PNP dual-output, NPN dual-output).
• The special-mark suffix "M" ("advanced function") is named in the model-code diagram but not defined elsewhere in the catalogue; its actual function needs confirming

Related Categories and Example Products

Explore other functions that may be needed in a machine or line. The products below are category examples, not pre-validated electrical or safety combinations. Confirm each interface and application separately: Safety Relays · Safety Door Locks & Switches · Press & Press Brake Protection

DA31 Emergency-Stop Safety Relay Module

Ultra-slim 22.6 mm Category 4/PL e/SIL 3 safety relay with dual-channel PNP/NPN input and a solid-state status output.

DX-C1 Magnetic Coded Safety Switch

Non-contact coded-magnet safety switch with 17 mm sensing range and high misalignment tolerance for guard doors.

DKE-L3 Press Brake Laser Protection

Ram-mounted laser guarding that tracks the punch tip on press brakes and shears without blocking hand-fed work.

Related Products in Safety Light Curtains

DCE Automation Safety Light Curtain

Compact through-beam safety light curtain in a 30 x 30 mm housing: 10/20/30/40 mm beam pitch, up to 72 beams, 0.3-3 m or 0.3-6 m sensing distance, NPN/PNP output. Catalogue-stated Type 4 design basis; confirm exact safety-document scope.

DD / DDOF Single-Sided Area Light Curtain

One housing, no far-side receiver: order DD for diffuse sensing to 2000 mm, or DDOF for per-beam TOF ranging to 4000 mm with zero dead zone and one-key distance teaching. 48 standard models, 4-50 beams.

DQA Long-distance Safety Light Curtain

Long-range through-beam safety light curtain for large presses, hydraulic and shearing machines: a transmitter/receiver pair spanning up to 40 m, in 8 beam pitches from 10 to 200 mm, with NPN, PNP or relay output and a selectable single- or dual-output signal. Designed to the Type 4 architecture of IEC 61496 and Category 4 of ISO 13849-1.

DQB Ultra-thin (Side-emitting) Safety Light Curtain

Ultra-thin side-emitting safety light curtain with a 15 x 30 mm cross-section for gaps too narrow for standard units.

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