Banner QL55 Series - Manual (Page 2)

QL55 Series Luminescence Sensor
2
P/N 112153 rev. C
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
The QL55 Series Sensor is an easy-to-use, extremely sensitive microprocessor-based
luminescence sensor that emits ultraviolet light from a high-power LED and scans for
luminescence in materials. The QL55 senses the luminescence inherent in a material,
or it can sense luminophores added to a material in process to make it luminescent.
The sensor can be set to accurately sense a wide range of luminescence intensities
and background conditions. The two-step QL55 Sensor programming procedure
sets the threshold for target luminescence and background. The Luminescent Target
condition is taught first, followed by the Luminescent Target Absent (background)
condition. During operation, the sensor outputs will be ON when the luminescent
target object is present, and OFF for the background condition. (The sensor may
instead be taught to respond to the Background condition; see page 3.)
Located within the QL55 Sensor, two selector switches may be used to enable an
output OFF-delay option and for setting the discrete output to NPN or PNP (see Figure
5). The QL55 is available with one of three operating ranges, to a maximum of 75 mm
(2.95"), depending on the model.
The sensor housing has two push buttons, Mark and Background, for easy
programming; it has two LEDs, Ready/Overload and Output, for easy monitoring
during operation. See Figure 1.
For easier understanding, the sensor faces are described in this data sheet as labeled
in Figure 2. The key pad is considered the sensor back, and the lens is on the bottom.
Luminescence Sensing
Luminescence sensing detects a form of electromagnetic radiation, caused by the
shining of UV light (“black” light, invisible to the human eye) on a luminescent
substrate material, such as a petroleum-based adhesive. When the UV light shines
on the adhesive, the light “excites” electrons in the material (effecting a change of
state), causing it to reflect visible light. Thus an invisible light source can produce a
visible reflection. Because it emits UV light but detects visible waves, the sensor can
distinguish between the fluorescent material and other highly reflective materials.
Cost Factors
When comparing luminescence sensors to make a selection, it is important to
consider whether luminophores must be added to the product sensed, in order for
the sensor to detect luminescence. Generally speaking, the more sensitive the sensor,
the lower the level of luminescence required for detection. Less sensitive (and usually
less expensive) sensors may require an additional step in the production process, and
a substantial cost over time, to add luminophores. For information on less expensive,
less sensitive luminescence sensor models, refer to data sheet p/n 112151, Model
QL50 Luminescence Sensor, or contact a Banner applications engineer for more
information (see back page for addresses).
READY OUT
MARK BKGD
Red
Output LED
Green Ready/
Overload LED
(Power ON
Indicator)
Mark
Push Button
Background
Push Button
Figure 1. QL55 Luminescence Sensor
features (sensor back)
Figure 2. QL55 orientation of features
Lens
Bottom
Front
Top
Back
Key
Pad
Blanking
Plug