Banner L-GAGE Q50 Series—Analog - Manual (Page 2)

L-GAGE Q50A –
Analog Output Sensor
page 2
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
L-GAGE Q50A Analog Output Sensor Overview
The Q50A is an easy-to-use triangulation sensor which provides
a sophisticated, yet cost-effective solution for demanding
measurement applications. Q50A Series sensors feature
compact, all-in-one design and require no separate controller.
Near and far sensing window limits are set quickly using simple
push-button or remote signal TEACH-mode programming. The
analog output has the option of being set with a sensing
distance centered within a 50 mm window. The sensor features
Banner’s patented digital signal processing algorithm (U.S. patent
#6,122,039), which automatically distributes the 0 to 10V dc (or 4
to 20 mA) output signal over the width of the programmed
window.
Optical Triangulation
The function of the Q50A Sensor is based on optical
triangulation (see Figure 1). The emitter circuitry and optics
create a light source which is directed toward a target. The light
source bounces off the target, scattering some of its light
through the sensor’s receiver lens to its position-sensitive-device
(PSD) receiver element. The target’s distance from the receiver
determines the light’s angle to the receiver element; this angle
determines where the returned light will touch the PSD receiver
element.
The position of the light on the PSD receiver element is
processed through analog and digital electronics and analyzed
by the microprocessor, which calculates the appropriate output
value. The analog output provides either a current or voltage
output proportional to the target’s position within the user-
programmed analog window limits (see page 4).
Signal
Conditioning
Circuitry
Microprocessor
Output
Circuitry
Emitter
Circuitry
Emitter
Lenses
Near
Limit
Target Movement
Programmed
Sensing Window
Far
Limit
PSD
Receiver
Element
E
R
Figure 1. Using optical triangulation to determine sensing distance
Figure 2. L-GAGE Q50A sensor features
Range
Indicator LED
(red or green)
Teach/Output
Indicator LED
(yellow or red)
Programming
Push Button
QD fitting rotates for hookup in any direction