Overview

Banner’s Class 2 visible laser displacement sensor brings a sophisticated yet cost-effective solution to precision measurement

applications. L-GAGE Series sensors feature all-in-one design and require no separate controller.

The L-Gage Laser Gauging System operates in two modes: TEACH (or programming) and RUN. Near and far sensing window limits are set

quickly using simple push-button or remote signal TEACH-mode programming. One sensor can simultaneously provide both analog and

discrete (switched) outputs. Sensing window limits for each output may be independently programmed. The analog signal features

Banner’s unique scalable output (patent pending), which automatically distributes the output signal over the width of the programmed

sensing window.

The L-GAGE Laser Gauging Sensor boasts many additional features, including selectable response speed, self-diagnostics with alarm

output, comprehensive status indicator system, and unique output “hold” function in case of momentary signal loss in profiling

applications.

Optical Triangulation

The design of the L-GAGE Laser Gauging Sensor is based on optical triangulation. An

emitter transmits visible laser light through a lens, toward a target. The laser light

beam from the emitter bounces off the target, scattering some of its light through

another lens to the sensor’s PSD (position-sensitive device) receiver element. The

target’s distance from the receiver determines the angle the light travels to the

receiver element; this angle in turn determines where the received light will fall

along 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 a variable signal that is

proportional to the target’s position within the user-programmed analog window

limits. The discrete (switched) output energizes whenever the target is located

between the user-programmed discrete window limits. Analog and discrete window

limits may be the same, or programmed independently.

Signal

Conditioning

Circuitry

Microprocessor

Output

Circuitry

Emitter

Circuitry

Laser

Emitter

Lenses

Near

Limit

Target Movement

Programmed

Sensing Window

Far

Limit

PSD Receiver

Element

E

R

Indicators

Signal LED. The Signal LED indicates the strength and condition of the sensor’s incoming signal.

Signal LED Status

Indicates

OFF

No signal is received, or the target is beyond the range limitations of the sensor (with some

tolerance beyond the recommended minimum and maximum sensing distance)

Flashing at 2 Hz

Received signal is adequate for processing

Flashing at 10 Hz

Received signal is in saturation (signal is too strong); alarm output energizes

ON Solid

Received signal is within the nominal conditions for the sensor

Output LED. The Output LED lights when the discrete output is conducting.

Power ON/OFF LED. The Power ON/OFF LED indicates the operating status of the sensor.

Power ON/OFF LED Status

Indicates

OFF

Power is OFF

Flashing at 2 Hz

Discrete or alarm output is overloaded

Flashing at 1 Hz

Power ON, Laser is disabled

ON Solid

Sensor is operating normally (power is ON, Laser enabled)

Power Up/Laser Enable. When powering up the sensor, the following should occur:

• All LEDs turn ON for 1 second

• Allow 1.25 second delay for Laser Enable at power up. (If sensor is already powered up, allow 0.25 second for Laser Enable.)

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