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DQL Measurement Light Curtain (Measuring Grating)

High-precision measuring light curtain for industrial automation. Spacings 1.25 / 2.5 / 5 / 10 / 20 / 40 / 80 mm; typical range 0.3–3 m (1.25 mm: 0.2–1 m); ambient light immunity ≥10,000 Lux; response time ≤ 15 ms; enclosure IP65. Outputs: RS485 / 4–20 mA / 0–10 V for analog/serial measurement.

Choose by the data your controller needs: DQL serves serial/analog measurement. If your task is fast object detection or counting with a switching signal, compare the DQM 0.5 ms NPN/PNP detection light curtain. The detection and measurement grating selection hub explains the distinction between measuring data, presence switching and personnel safeguarding.

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Measuring / sizing scenarios
Dimensions & wiring
Typical applications
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Product Highlights
  • High precision: minimum spacing 1.25 / 2.5 mm options for fine measurement.
  • Fast & reliable: ≤15 ms typical response; robust self-diagnostics to ensure valid data.
  • Industrial outputs: RS485 (Modbus RTU), 4–20 mA / 0–10 V analog—easy to integrate with PLC/SCADA.
  • Strong immunity: resists EMI, welding arc, strobe; ambient light immunity ≥10,000 Lux.
  • Durable body: Aluminum profile, IP65; shock-resistant SMT design.
  • Flexible installation: Circular aviation connector, dedicated cables; multiple mounting kits.

Measurement distance for 1.25 mm versions is typically 0.2–1 m; other spacings 0.3–3 m (0.3–6 m optional).

Spacing & Use Guide
Spacing (K)Typical Use
1.25 / 2.5 mmFine height / edge / profile measurement; precision sizing & counting
5 / 10 mmGeneral dimensioning, presence/height measurement
20 / 40 / 80 mmLarge object sizing, passage counting, area detection

Protective/measurement height H = (n − 1) × K. Overall length L ≈ H + addon (see spec tables).

Technical Parameters (DQL Series)

CategoryItemTypical Value / OptionNotes
OpticalOperating principleThrough-beam infrared LED, modulatedEmitter/receiver pair; synchronous scanning
Spacing (K)1.25 / 2.5 / 5 / 10 / 20 / 40 / 80 mm1.25 & 2.5 mm for fine measurement
Measurement height (H)H = (n−1) × Kn = number of beams
Response time≤ 15 msVaries with beams
Ambient light immunity≥ 10,000 LuxIncidence ≥ 5°
Range0.3–3 m (typ.); 1.25 mm: 0.2–1 m0.3–6 m optional (except 1.25 mm)
Electrical / I/OSupplyDC 12/24 V; AC 110–220 V (with controller)Reverse/over-voltage protection
OutputsRS485 (Modbus RTU) / 4–20 mA / 0–10 VReal-time measuring data
IndicatorsPower / Beam OK / BlockClear status display
ConnectorCircular aviation connectorDedicated cables
Short/over-current protectionYesAuto recovery
SynchronizationOpticalFewer cables, strong immunity
ProtocolModbus RTU 4800–38400 bps8N1, 16-bit CRC
Mechanical / EnvironmentBody sectionApprox. 36 × 36 mmAluminum, ABS reinforced nylon endcaps
Overall lengthL ≈ H + addonAddon depends on K
Ingress protectionIP65Dust-tight, water-jet resistant
Operating temp.−10 ~ +40 °CStorage −25 ~ +55 °C
HumidityOperating 35–85 %RHStorage 35–95 %RH

DQL Series Detailed Specifications

Tables list typical beam counts (n) for each spacing (K) with measurement height H and overall length L. Model format: DQLnn/K-H. Example: DQL40/2.5-97.5. Output mode is selected by wiring (RS485 / 4–20 mA / 0–10 V).

K (mm)Beams nMeasurement Height H (mm)Overall Length L (mm)Model ExampleRangeOutputs
1.256478.8132.8DQL64/1.25-78.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.2596118.8172.8DQL96/1.25-118.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25128158.8212.8DQL128/1.25-158.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25160198.8252.8DQL160/1.25-198.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25192238.8292.8DQL192/1.25-238.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25224278.8332.8DQL224/1.25-278.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25256318.8372.8DQL256/1.25-318.80.2–1 mRS485 / 4–20 mA / 0–10 V
1.25288358.8412.8DQL288/1.25-358.80.2–1 mRS485 / 4–20 mA / 0–10 V

Model format DQLnn/K-H. For long-range (0.3–6 m) builds (except 1.25 mm), specify on order.

Typical Applications

  • Sizing / profiling / height: online size inspection, profile gauging, accuracy correction.
  • Counting / sorting: logistics, packaging, lanes; piece counting and classification.
  • Wood / board / tube: length/diameter, edge detection, cut control.
  • General automation: connect RS485 / analog to PLC or DAQ for measurement and monitoring.

DQL is for measurement output. For a safety stop function, choose a documented safety light curtain system and validate its controller, outputs and stopping performance for the machine.

Working Principle

The DQL series uses opposed infrared beams. The emitter sends modulated pulses scanned sequentially; the receiver detects each channel. When an object blocks one or more beams, the controller calculates the blocked-channel count/position and outputs measurement via RS485 (Modbus RTU) or analog 4–20 mA / 0–10 V. Optical synchronization and filtering ensure strong ambient-light immunity; self-diagnostics guarantee reliable data.

Frequently Asked Questions

What is a measurement light curtain and how does the DQL differ from a safety light curtain?

A measurement (measuring) light curtain uses an array of through-beam infrared beams to size, profile, count or measure object height by reporting which beams are blocked. The DQL outputs measuring data over RS485 (Modbus RTU), 4–20 mA or 0–10 V. Measurement data is not a certified safety-stop signal. For personnel safeguarding, select a safety light curtain with exact-model documentation and validate the complete safety system; a series name alone does not establish its rating.

What beam spacing should I choose for my measurement application?

Beam spacing (K) sets resolution. Choose 1.25 or 2.5 mm for fine height, edge and profile measurement or precision sizing; 5 or 10 mm for general dimensioning and presence detection; and 20/40/80 mm for large-object sizing, passage counting and area detection. Measurement height follows H = (n − 1) × K, where n is the number of beams.

What is the measuring range and response time of the DQL?

Typical range is 0.3–3 m, with a 0.3–6 m option available for spacings other than 1.25 mm; the fine 1.25 mm version covers 0.2–1 m. Response time is ≤15 ms and varies with beam count. Ambient light immunity is ≥10,000 Lux at incidence ≥5°, so it resists EMI, welding arc and strobe interference on busy production lines.

How does the DQL connect to a PLC, SCADA or DAQ system?

The DQL provides industrial outputs you select by wiring: RS485 Modbus RTU (4800–38400 bps, 8N1, 16-bit CRC) for serial data, plus analog 4–20 mA and 0–10 V. This lets it integrate directly with most PLC, SCADA or data-acquisition systems for real-time measurement and monitoring. A circular aviation connector and dedicated cables simplify field installation.

What ingress protection and operating environment does the DQL support?

The DQL has an IP65-rated aluminum profile body (approx. 36 × 36 mm) with ABS reinforced-nylon endcaps, making it dust-tight and water-jet resistant. Operating temperature is −10 to +40 °C (storage −25 to +55 °C) with operating humidity 35–85 %RH. Optical synchronization and self-diagnostics ensure reliable measurement data in harsh industrial conditions.

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Specs reviewed by Engineer Cai, Senior Application Engineer. See certificates.

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