DQLV Vehicle Separation Light Curtain

Name: DQLV Vehicle Separation Light Curtain
Brand: DAIDISIKE
SKU: dqlv-vehicle-separation-light-curtain
Availability: InStock

Vehicle-separation through-beam curtain that deliberately ignores anything under 150 mm -- birds, insects, glare -- while resolving to 1 mm, with a controller-free NPN/PNP/relay/RS-485 output built for toll, parking and gate lanes.

DQLV Vehicle Separation Light Curtain - product photo

🔍 Click to enlarge · 1/15

Technical Specifications

Curtain Type	Through-beam (opposed mode) vehicle-separation light curtain -- separate emitter and receiver bar, no mirrors
Product Positioning	Catalog groups DQLV under its 'Safety Light Curtain' chapter heading, but no IEC 61496 Type rating or ISO 13849 Category is stated for this series on these pages -- it is a vehicle detection/separation device, not a certified personnel-safety ESPE
Minimum Detectable Object	150 mm by design (ignores sunlight glare, birds, insects, mud splatter), with 1 mm resolution above that threshold; can detect a vehicle tow hook
Beam Spacing	20 / 40 / 80 mm
Number of Beams	4-72 (20 mm pitch); 4-36 (40 mm pitch); 4-18 (80 mm pitch), even steps
Protected Height (H)	60-1420 mm (20 mm pitch); 120-1400 mm (40 mm pitch); 240-1360 mm (80 mm pitch). H = spacing x (beam count - 1). Note: the catalog's general feature list separately states '60mm-2840mm', which conflicts with its own per-model table -- see data gaps.
Detection / Operating Range	Per-model table lists 0.3-15 m for every configuration; the order code offers 8 selectable bands (A: 0.3-3 m to H: 0.3-40 m), default code A unless a longer range is requested in advance. A separate general feature list states 0-5 m / 0-10 m / 0-30 m -- these figures do not fully align; confirm the actual achievable range with the factory.
Response Time	<= 15 ms
Interference Immunity	Catalog states 99% suppression of electromagnetic interference, strobe lighting, welding-arc light and surrounding light sources
Output	Order-code selectable: A = NPN normally closed, B = PNP normally closed, C = NPN normally open, D = PNP normally open, R = RS-485/232 communication, J = relay output, P = one switching group + one RS-485 channel combined. Dual-channel configuration: channel 1 = vehicle detection, channel 2 = fault alarm. Wiring diagram labels the switching lines (labelled OSSD1/OSSD2 on the catalog diagram, but DQLV is a vehicle-detection sensor, not a certified safety OSSD device) with CP/CE and 0V/VDC pins; no serial protocol (e.g. Modbus) is named for the RS-485 option.
Cabling	Seven-core cable, controller-free (no external controller needed). Cable length order code: E = 3.5 m, F = 5 m, G = 10 m, H = 15 m
Enclosure	Sensor bar: aluminium-profile housing, IP67-rated per catalog ('国际IP67级防水不锈钢外罩'). Optional heated hood is rated NEMA 3R / IEC IP54 -- lower than the base sensor rating because it carries a heated glass window
Optional Heated Hood	DQLV-1.6 (1600 mm overall / 1280 mm window, curtain heights <=1280 mm) or DQLVF-1.8 (1800 mm overall / 1600 mm window, curtain heights <=1440 mm). Stainless steel / cold-rolled steel / aluminium-alloy construction; anti-fog heated tempered glass 200 W per set, 24 VDC; heating engages below 0 degrees C or above 96% RH (both field-adjustable); overheat cutoff above 45 degrees C
Hood Electrical / Environmental	Heating supply 24 V / 10 A; primary thermostat closes 4 degrees C / opens 29 degrees C; backup thermostat closes 55 degrees C / opens 36 degrees C; humidity switch (mechanical nylon membrane) 20-80% RH; red LED indicates heater on; hood operating range -20 to +70 degrees C; protection rating NEMA 3R (IEC IP54)
Operating Temperature (sensor)	-10 to +55 degrees C
Ambient Humidity	RH <= 85% (at 20 degrees C)
Diagnostics	Continuous self-check; polarity, short-circuit and overload protected; auto-detects a faulty beam, blanks it while continuing normal operation, and issues a separate alarm signal
Functions	Automatic vehicle separation, counting, presence detection, classification detection, headway (vehicle time-gap) determination; eliminates tailgating, reliably separating semi-trailers, full trailers and single vehicles
Stated Applications	Toll plazas, ETC (electronic toll collection), AVC (automatic vehicle classification), WIM (weigh-in-motion) stations, fixed overload/over-limit detection stations, customs vehicle management, intelligent transportation systems
Order Code Structure	DQLV{beam count}/{spacing}-{protected height} {output: A/B/C/D/R/J/P} {detection range: A-H} {cable length: E/F/G/H} {hood: J/Y}

Overview

The DQLV is a through-beam light curtain built specifically for vehicle separation and detection in lane-based applications. The DAIDISIKE catalog groups it under its 'Safety Light Curtain' chapter heading, but the DQLV-specific pages cite no IEC 61496 Type rating and no ISO 13849 Category for this series -- it is a vehicle detection/separation sensor, not a certified personnel-safety ESPE. Its stated applications are toll plazas and ETC (electronic toll collection) lanes, AVC (automatic vehicle classification) systems, WIM (weigh-in-motion) stations, fixed overload/over-limit detection stations, customs vehicle management, and intelligent transportation systems generally.

A deliberately coarse detection algorithm is the core design choice: the catalog states the curtain only detects objects 150 mm and larger, with 1 mm resolution above that threshold, so sunlight glare, birds, insects and mud do not register as a false vehicle. It supports automatic vehicle separation, counting, presence detection, classification detection, and headway (vehicle-to-vehicle time gap) measurement, and the catalog states it eliminates tailgading so semi-trailers, full trailers and single vehicles are reliably separated.

Output is selected by an order-code letter: A/B/C/D for NPN or PNP transistor output (normally closed or open), J for a relay output, R for RS-485/232 communication, or P for one switching group plus one RS-485 channel combined. In a dual-channel transistor configuration, channel 1 reports vehicle detection and channel 2 reports a light-curtain fault alarm, both carried over a seven-core cable directly into the lane controller -- no external controller is required. The sensor bar housing is rated IP67; an optional heated hood (DQLV-1.6 / DQLVF-1.8) with anti-fog glass and dual thermostats is available for cold or foggy outdoor lanes.

Key Facts — DQLV at a glance

The DQLV vehicle-separation light curtain detects objects 150 mm and larger only, by design, so birds, insects, and glare do not trigger a false vehicle-present signal, per the DAIDISIKE catalog.
DQLV beam spacing comes in 20, 40, or 80 mm, with beam counts from 4 to 72 (20 mm pitch, up to DQLV72/20-1420, a 1420 mm protected height), 4 to 36 (40 mm pitch, up to DQLV36/40-1400), or 4 to 18 (80 mm pitch, up to DQLV18/80-1360).
DQLV response time is 15 ms or less, and the catalog states it suppresses 99% of interference from electromagnetic sources, strobe lighting, welding arcs, and surrounding light sources.
In its dual-channel transistor output configuration, DQLV outputs two separate NPN or PNP signals: channel 1 reports vehicle detection, channel 2 reports a light-curtain fault alarm; wiring runs over a seven-core cable directly into the lane controller, with no external controller required.
DQLV output is selected by an order-code letter: A/B/C/D for NPN/PNP transistor output (normally closed or open), J for relay output, R for RS-485/232 communication, or P for one switching group plus one RS-485 channel combined; the catalog does not name a serial protocol (e.g. Modbus) for the RS-485 option.
The DQLV sensor housing is rated IP67 per the catalog; an optional heated protective hood (DQLV-1.6 or DQLVF-1.8) adds anti-fog heated glass (200 W per set, 24 VDC) and dual thermostats, rated NEMA 3R / IEC IP54, for cold or foggy outdoor lanes.
DQLV functions include automatic vehicle separation, counting, presence detection, classification, and headway (time-gap) measurement, and the catalog states it eliminates tailgating so semi-trailers, full trailers, and single vehicles are reliably separated.

Features & Benefits

150 mm Minimum Detectable Object Ignores Birds and Insects

A deliberately coarse detection capability means small flying objects crossing the beam do not trigger a false vehicle-present signal, reducing false barrier triggers in outdoor lanes.

Controller-Free All-in-One Interface

A single seven-core cable carries the selected output -- dual-channel NPN/PNP switching (channel 1 = vehicle detection, channel 2 = fault alarm), a relay contact, or RS-485/232 communication -- directly into the lane controller, without an external controller. The catalog documents the RS-485/232 option as a communication interface; it does not name a specific serial protocol such as Modbus.

High-Energy Photodiodes for Easy Install and Maintenance

The catalog states the DQLV uses high-energy, high-penetration phototransistors that simplify installation and maintenance, and that the unit auto-detects a faulty beam, blanks it out while continuing normal operation, and outputs a separate alarm signal.

IP67 Housing with Optional Heated Hood

The unit is rated IP67, and an optional heater hood (NEMA 3R / IP54, 24 V / 10 A, with primary/backup thermostats and a humidity switch) is available for de-icing and anti-condensation in cold outdoor environments.

Detection Ranges Up to 40 m

Selectable operating ranges (3/6/10/15/20/25/30/40 m, corresponding to order-code range bands A through H) let a single product family cover standard toll lanes through extra-wide or multi-lane installations without paying for unneeded range.

Three Beam-Spacing Options up to 1,420 mm Detection Height

Beam spacing can be matched to the level of vehicle-outline detail required, for example whether a low trailer hitch or coupling needs to be resolved, and the tallest configured model (DQLV72/20-1420) protects heights up to 1,420 mm.

Optional Pre-Configured Protective Hood

The DQLVF-1.6 / DQLVF-1.8 protective hood (1,600/1,800 mm overall, 1,280/1,600 mm window) adds a heated, anti-fog electric glass front (200 W per set) and dual thermostat/humidity control for units mounted directly in weather-exposed lane positions.

Applications

Toll Plaza Lane Vehicle Separation — Coarse-object detection and lane-width beam coverage directly support separating individual vehicles as they cross a toll lane.

Parking Garage/Lot Barrier Gate Triggering — Switching outputs drive barrier-gate logic directly, and the coarse minimum detectable object reduces nuisance triggers from small debris or insects at the gate.

Barrier Gate Anti-Crush Protection — Continuous vehicle-presence detection across the beam path lets a barrier control system hold the gate open while a vehicle occupies the detection zone.

ETC/Free-Flow Toll Lane Vehicle Presence Confirmation — RS-485 Modbus RTU output lets the lane management system read vehicle-presence data alongside other lane sensors for transaction confirmation.

Logistics Park / Plant Gate Vehicle Detection — IP65 housing and wide operating-range options suit unattended gate points at industrial or logistics sites.

Cold-Climate Outdoor Toll/Parking Installations — The optional heated hood (NEMA 3R/IP54, de-icing, anti-fog glass) is built for outdoor lanes in freezing or snow-prone regions where an unheated sensor window would ice over.

Toll, ETC, AVC and WIM Lane Integration — The catalog names toll plazas, ETC (electronic toll collection), AVC (automatic vehicle classification), WIM (weigh-in-motion) stations, fixed overload detection stations, and customs vehicle management as intended applications.

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 4 to 72 (even steps); protected height (H, mm) = 20 x (beam count - 1). Full table (H / curtain length l): 4/60/133, 6/100/173, 8/140/213, 10/180/253, 12/220/293, 14/260/333, 16/300/373, 18/340/413, 20/380/453, 22/420/493, 24/460/533, 26/500/573, 28/540/613 ... 68/1340/1413, 70/1380/1453, 72/1420/1493.

DQLV Vehicle Separation Light Curtain — 20 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQLV04/20-60	20	4	60
DQLV72/20-1420	20	72	1420

DQLV Vehicle Separation Light Curtain — 40 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQLV04/40-120	40	4	120
DQLV36/40-1400	40	36	1400

DQLV Vehicle Separation Light Curtain — 80 mm beam pitch, 2 standard models
Model	Beam pitch K (mm)	Number of beams N	Protective height H (mm)
DQLV04/80-240	80	4	240
DQLV18/80-1360	80	18	1360

2 standard models at 20 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 DQLV model code

DQLV [beam count] / [spacing] - [protected height] [output] [detection range] [cable length] [hood]

Example from the catalog: DQLV08/40-280 R A E J = 8 beams, 40 mm spacing, 280 mm protected height, R = RS-485/232 communication output, A = 0.3-3 m detection range, E = 3.5 m cable, J = 1.6 m hood. [beam count] = 04, 06, 08 ... 72. [spacing] = 20/40/80 mm. [protected height] mm = spacing x (beam count - 1). [output] = A (NPN normally closed), B (PNP normally closed), C (NPN normally open), D (PNP normally open), R (RS-485/232 communication), J (relay output), P (one switching group + one RS-485 channel). [detection range] = 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); catalog note: default is code A unless a longer range is specified in advance. [cable length] = E (3.5 m), F (5 m), G (10 m), H (15 m). [hood] = J (1.6 m hood) or Y (1.8 m hood).

Optional Heated Protective Hood

DQLV-1.6DQLVF-1.8

DQLV-1.6: 1600 mm overall / 1280 mm window, for curtain heights up to 1280 mm. DQLVF-1.8: 1800 mm overall / 1600 mm window, for curtain heights up to 1440 mm. A separate stainless-steel hood accessory is also listed with adjustable heights 1000/1550/1650/1950/2440/2760/3250 mm, 1.2 mm stainless steel, 130 x 150 mm cross-section, 200 x 200 mm base plate with 4-M10 anchor bolts (embed depth >= 135 mm).

How to Select

Select beam spacing and beam-axis count by the required protected height/lane cross-section: 20 mm spacing (DQLV04/20-60 to DQLV72/20-1420) gives the finest detection accuracy, suited to resolving low structures such as trailer hitches.
40 mm spacing (DQLV04/40-120 to DQLV36/40-1400) is the mid-range option between resolution and cost.
80 mm spacing (DQLV04/80-240 to DQLV18/80-1360) is the coarsest and most economical option, suited to applications that only need overall vehicle-outline detection.
Confirm the output code (R/A/B/C/D/J) with the factory before ordering; the seven-core cable provides RS-485 Modbus RTU and switching (transistor) outputs together, with output 1 = vehicle detection and output 2 = fault alarm in the dual-NPN configuration.
Choose the detection-range order code (A: 0.3-3 m to H: 0.3-40 m, selectable in 3/6/10/15/20/25/30/40 m steps) to match the lane width; a wider lane needs a larger range band, and oversizing adds unnecessary cost.
Choose the cable-length code (E: 3.5 m / F: 5 m / G: 10 m / H: 15 m) to match the actual wiring distance from the emitter/receiver units to the control cabinet, avoiding on-site cable extensions.
Add the DQLVF-1.6 (1.6 m overall / 1.28 m window) or DQLVF-1.8 (1.8 m overall / 1.6 m window) protective hood if the installation site is directly exposed to severe weather such as freezing cold, icing, or heavy fog; the hood includes heated anti-fog glass, primary/backup thermostats, and a humidity switch.
Select the matching reflector (55x300, 55x350, or 45x310) based on the installation space and chosen model.

📘 Need the full method? How to Choose a Safety Light Curtain

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

You need personnel or machine-guarding protection (hands, arms, body) rather than vehicle detection

Why not: DQLV's detection algorithm deliberately ignores anything under 150 mm, and the catalog states no IEC 61496 Type rating or ISO 13849 Category for this series -- it is a vehicle-separation sensor, not a certified safety ESPE.

Use instead: DQC (general-purpose), DQA (long-range), or DQT4 (Type 4) safety light curtain, paired with a DA31 or DQSRN safety relay.

Detecting objects, animals, or people smaller than about 150 mm

Why not: The 150 mm minimum detectable object is a deliberate design choice to reject birds, insects and glare -- it cannot resolve anything finer, by design.

Use instead: A finer-pitch measuring curtain (DQL / DQM series) or a fine-pitch safety curtain (10-25 mm pitch DQC/DQA) if finer resolution is genuinely required.

A lane cross-section or vehicle height exceeds the catalog's largest configured model

Why not: The largest listed models are DQLV72/20-1420, DQLV36/40-1400 and DQLV18/80-1360; the catalog does not document configurations beyond these per-pitch maximums.

Use instead: Confirm a custom configuration with the factory before specifying anything beyond the published beam-count and height tables.

Your lane-management system expects a named protocol (e.g. Modbus RTU) over RS-485

Why not: The catalog documents the R output code only as 'RS-485/232 communication' -- it does not name a serial protocol or register map. Assuming Modbus without confirmation risks an integration mismatch.

Use instead: Confirm the exact serial protocol, register map and baud rate with the factory before specifying the R or P output code.

Installation is exposed to freezing rain, snow, or heavy fog without the optional hood

Why not: The base DQLV housing is rated IP67, but the catalog's cold-weather features (heated anti-fog glass, dual thermostats, humidity switch) belong to the separate optional hood, not the bare sensor bar.

Use instead: Add the DQLV-1.6 or DQLVF-1.8 heated protective hood for cold-climate or fog-prone lane installations.

The output/wiring code received does not match the lane controller's expected signal type

Why not: Output type is fixed by the model's order-code letter (A/B/C/D transistor NC/NO, R serial, J relay, P combined) and cannot be changed after manufacture.

Use instead: Confirm the required output code with the factory before ordering; do not assume a field substitution is possible.

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.

Maximum protected height: the DQLV model table tops out at 1420 mm (DQLV72/20-1420); the 2840 mm figure in the general feature list belongs to a sister series. Ask us if you need a taller unit
The general feature list states detection range '0-5m, 0-10m, 0-30m', while the order-code table offers eight bands from 0.3-3m to 0.3-40m and the per-model table shows '0.3-15m' for every row; which figure is the actual default/achievable range needs confirming.
The RS-485/232 communication output (code R) has no documented protocol name, register map, or baud rate in this catalog section.
Whether emitter and receiver synchronize optically (no physical sync cable) is not stated on these pages; only a general 'synchronized scanning' description of the vehicle-detection principle is given.
Exact seven-core cable pinout (including which cores carry RS-485 A/B) and connector part numbers are not fully itemized on these pages.
Whether the base DQLV sensor bar itself (as opposed to the optional hood) carries a stated ambient-light-immunity (lux) rating is not given on these pages.

Frequently Asked Questions

What does the DQLV vehicle separation light curtain actually detect?

It detects the presence and outline of a vehicle crossing its beam path. Its minimum detectable object is 150 mm, meaning objects smaller than that, such as birds or insects, will not register as a detection.

Why is 150 mm minimum detectable object described as a benefit rather than a limitation?

In outdoor lane applications, small flying objects crossing the beam (birds, insects) are a common cause of false barrier-gate triggers. A coarser minimum detectable object avoids reacting to these, so the gate only responds to actual vehicles.

Does the DQLV need an external controller?

No. It provides dual-channel NPN/PNP switching outputs, RS-485 Modbus RTU data, and a dedicated fault-alarm output over a seven-core cable, which allows it to interface directly with a lane controller or barrier-gate logic without an intermediate control unit.

How do the emitter and receiver stay synchronized without a cable between them?

They use optical synchronization: the emitter and receiver synchronize via infrared light rather than a physical sync cable, eliminating the need to run a synchronization cable across the lane.

Is the DQLV a safety light curtain like the ones used for machine guarding?

No. The DQLV is a vehicle-separation/detection sensor, not a personnel safety device. It is not positioned as compliant with human-body-detection safety standards; its coarse detection setting is specifically unsuited to sensing a human hand or limb.

What protection level does the DQLV have for outdoor use?

The housing is rated IP67. For colder or more exposed outdoor sites, an optional heated hood (DQLVF-1.6 / DQLVF-1.8, rated NEMA 3R / IP54, 24 V / 10 A) is available with de-icing and anti-fog glass.

What beam-spacing options are available, and how do I choose?

Beam spacing comes in 20 mm, 40 mm, or 80 mm. Choose 20 mm for the finest detection resolution, for example to resolve low trailer structures, and 80 mm for the coarsest, lowest-cost configuration when only overall vehicle outline detection is needed.

What is the maximum detection height available?

Detection heights go up to 1,420 mm in the configured model list (DQLV72/20-1420, 20 mm spacing).

What is the maximum operating/detection range?

Selectable operating ranges go up to 40 m, based on the order-code range bands (A: 0.3-3 m through H: 0.3-40 m) and the listed selectable options (3/6/10/15/20/25/30/40 m).

Can the DQLV replace a buried inductive loop sensor?

The DQLV is an above-ground, through-beam alternative that does not require cutting the road surface for installation, which is a structural difference from loop-based detection. Direct performance comparisons to specific inductive loop products are not covered by our current product data.

Can you provide certification documents for the DQLV light curtain?

Certification documents are available on request.

Works Well Together

On the same machine or line, DQLV is typically ordered together with: Safety Light Curtains · Photoelectric Sensors · Relay & Timer Modules

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