Overview

The QL56 Series Luminescence Sensor is an easy-to-use, extremely

sensitive luminescence sensor that emits ultraviolet (UV) light from high-

power LEDs and detects visible light created by luminescent targets. This

technology allows for the detection of luminescent marks (even invisible

ones) on any surface, independently from its material, color, or distance

inside the operating range, as long as the target radiates visible light when

illuminated with UV light.

Applications

The QL56 can be used to error-proof manufacturing lines and verify the

presence of glues, lubricants, tamper-proof labels, inks, paint, or the

inspector’s UV mark. There are many applications where the unique

property of luminescence can be used to verify that a chemical or adhesive

was applied, to inspect for leaks on a seal, or to ensure a critical

manufacturing step was completed.

Many materials exhibit luminescence naturally or can be enhanced to

include luminescence dyes (also known as luminophores). For example,

white bond paper exhibits luminescence under the UV light without any

additional treatment. Or a corrosion prevention treatment may be

enhanced to include a luminescence dye so that its application can be

verified later.

Green

Ready

LED

Set Keylock

and Delay

Push Button

Sensitivity Adjustment

Push Buttons

Yellow

Output

LED

Orange

Delay

LED

Orange

Keylock

LED

Bargraph

Indicators

Figure 1. Features

The Advantage of the QL56

The QL56 sensor uses six UV LEDs which create a uniform and intense line of UV light. The structured light allows for

reliable detection of luminescence marks on irregular or textured surfaces such as wood, textile, or cast surfaces. The

sensor’s durable aluminum housing ensures years of use in challenging environments. Most applications can be

addressed with the bi-polar discrete outputs, but an analog output signal is available to make subtle pass or fail decisions

if greater contrast resolution is required.

Sensor Configuration

General Notes on Configuration

•

The sensor's KEYLOCK function deactivates the push buttons to

avoid accidental sensor setting. The push buttons are locked at

sensor power-up (KEYLOCK LED OFF). To enable the push

buttons, press and hold the SET push button for 5 seconds; there

is a 2 minute timeout for the keylock.

•

The DELAY SETTING extends the minimum active output status

duration to 20 ms, allowing slower interface systems to detect

shorter pulses.

•

The analog output supplies a voltage proportional to the signal

received by the sensor. The voltage supplied is 0.75 to 5.5 V.

Sensor

Output

OFF-Delay (20 ms)

Output Ends

Output

Starts

Figure 2. OFF-delay: output continues for 20 ms

after sensing stops

Procedure

Result

Keylock Setting

Press and hold SET push button for 5

seconds (the keyboard will

automatically re-lock if inactive for 2

minutes)

Keylock LED: ON

QL56 Series Luminescence Sensor

2

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