Photoelectric light curtain designed for vehicle separation, counting and classification at tolls, WIM, intersections and traffic monitoring sites. Resolutions 20/40/80 mm; protective height H=(n−1)×K; typical detection range 0.3–15 m (options up to 0.3–40 m); optical synchronization, fast response, strong anti-interference. Dual-channel NPN/PNP (NO/NC) plus RS485 option. Optional heated outdoor enclosure for snow and low-temperature scenarios.
Data summarized from the provided DQLV manual sheets. If discrepancies occur, the official datasheet prevails.
Resolution & Selection Guide
Resolution (K)
Typical Application
20 mm
Precise vehicle head detection, separation & counting
40 mm
Standard vehicle presence & classification
80 mm
Wide openings / long-range presence
Protective height H = (n − 1) × K. Overall length for DQLV L = P + H + J + 18 + 18. P/J depend on resolution (see tables below).
Technical Parameters (DQLV Series)
Category
Item
Typical Value / Option
Notes
Optical
Operating principle
Through-beam IR LED, modulated
Emitter/receiver pair with filtering & anti-jamming
Resolution (K)
20 / 40 / 80 mm
Vehicle separation, counting, classification
Protective height (H)
H = (n−1) × K
n = number of beams
Response time
≤ 15 ms
Depends on beam count
Detection range
0.3–15 m (typ.)
Options up to 0.3–40 m
Ambient immunity
High sunlight immunity
Flicker & stray-light suppression
I/O & Power
Supply
DC 12–24 V (controller AC 110–220 V optional)
Reverse/over-voltage protection
Outputs
Dual-channel NPN / PNP, NO/NC selectable
Plus RS485/232 communication option
Protection
Short / over-current / over-load
Auto recovery
Indicators
Power / All-clear / Blocked LEDs
Front window indication
Sync
Optical synchronization
Stable wiring
Cable length
3.5 m / 5 m / 10 m / 15 m
Factory-selectable
Ingress protection
IP65 (sensor)
Heated housing NEMA 3R / IEC IP54
Heated Outdoor Enclosure (Option)
Power
24 V / 10 A
Automatic heating & humidity control
Controllers
Main 4 °C off / 29 °C on; Backup 55 °C off / 36 °C on
Panel-sealed thermostats
Materials
Stainless steel / aluminum; heated glass window
Anti-fog, anti-frost
Env. range
Typical −20 °C ~ +70 °C
For rainy/snowy/low-temp sites
DQLV Series Detailed Specifications
Model format: DQLV-K-NN-H. Example: DQLV-40-04-120 (K=40, n=4, H=120). P/J from the dimension sheet; overall length uses L = P + H + J + 36 (18 mm allowance at both ends).
K (mm)
Beams n
Protective Height H (mm)
P/J (mm)
Overall Length L (mm)
Model Example
Range
20
4
60
10/25
131
DQLV-20-04-60
0.3–15 m (typ.)
20
6
100
10/25
171
DQLV-20-06-100
0.3–15 m (typ.)
20
8
140
10/25
211
DQLV-20-08-140
0.3–15 m (typ.)
20
10
180
10/25
251
DQLV-20-10-180
0.3–15 m (typ.)
20
12
220
10/25
291
DQLV-20-12-220
0.3–15 m (typ.)
20
14
260
10/25
331
DQLV-20-14-260
0.3–15 m (typ.)
20
16
300
10/25
371
DQLV-20-16-300
0.3–15 m (typ.)
20
18
340
10/25
411
DQLV-20-18-340
0.3–15 m (typ.)
20
20
380
10/25
451
DQLV-20-20-380
0.3–15 m (typ.)
20
22
420
10/25
491
DQLV-20-22-420
0.3–15 m (typ.)
20
24
460
10/25
531
DQLV-20-24-460
0.3–15 m (typ.)
20
26
500
10/25
571
DQLV-20-26-500
0.3–15 m (typ.)
20
28
540
10/25
611
DQLV-20-28-540
0.3–15 m (typ.)
20
30
580
10/25
651
DQLV-20-30-580
0.3–15 m (typ.)
20
32
620
10/25
691
DQLV-20-32-620
0.3–15 m (typ.)
20
34
660
10/25
731
DQLV-20-34-660
0.3–15 m (typ.)
20
36
700
10/25
771
DQLV-20-36-700
0.3–15 m (typ.)
20
38
740
10/25
811
DQLV-20-38-740
0.3–15 m (typ.)
20
40
780
10/25
851
DQLV-20-40-780
0.3–15 m (typ.)
20
42
820
10/25
891
DQLV-20-42-820
0.3–15 m (typ.)
20
44
860
10/25
931
DQLV-20-44-860
0.3–15 m (typ.)
20
46
900
10/25
971
DQLV-20-46-900
0.3–15 m (typ.)
20
48
940
10/25
1011
DQLV-20-48-940
0.3–15 m (typ.)
20
50
980
10/25
1051
DQLV-20-50-980
0.3–15 m (typ.)
20
52
1020
10/25
1091
DQLV-20-52-1020
0.3–15 m (typ.)
20
54
1060
10/25
1131
DQLV-20-54-1060
0.3–15 m (typ.)
20
56
1100
10/25
1171
DQLV-20-56-1100
0.3–15 m (typ.)
20
58
1140
10/25
1211
DQLV-20-58-1140
0.3–15 m (typ.)
20
60
1180
10/25
1251
DQLV-20-60-1180
0.3–15 m (typ.)
20
62
1220
10/25
1291
DQLV-20-62-1220
0.3–15 m (typ.)
20
64
1260
10/25
1331
DQLV-20-64-1260
0.3–15 m (typ.)
20
66
1300
10/25
1371
DQLV-20-66-1300
0.3–15 m (typ.)
20
68
1340
10/25
1411
DQLV-20-68-1340
0.3–15 m (typ.)
20
70
1380
10/25
1451
DQLV-20-70-1380
0.3–15 m (typ.)
20
72
1420
10/25
1491
DQLV-20-72-1420
0.3–15 m (typ.)
For long lanes select range variants up to 0.3–40 m. Keep the model format DQLV-K-NN-H.
Typical Applications
Toll lanes / ETC / toll plazas: vehicle separation and anti-tailgating; reliable head detection.
Weigh-in-Motion (WIM) & traffic statistics: counting, presence and classification with RS485 integration.
Intersections / access control / logistics gates: long-range presence, queue monitoring and alarm output.
Harsh outdoor sites: add the heated enclosure to maintain clear optics in rain, snow and low temperatures.
When selecting range variants (A…H), choose according to lane width and installation height; for >5 m please specify in advance.
