L-GAGE LT3 Series—Analog & Discrete


Precise long-range measurement sensors with analog and discrete output

  • Offers 12-24V supply voltage with analog and discrete output:
    • NPN or PNP discrete output
    • 4-20 mA or 0-10V dc analog output, automatically scaled across the width of the programmed sensing window
  • Automatically scales the analog output over the width of the programmed sensing window
  • Offers diffuse models for background suppression up to 5 m
  • Features retroreflective models for long-range precision sensing up to 50 m
  • Provides push-button TEACH-mode programming for custom sensing windows
  • Includes remote programming for added security and convenience
  • Offers programmable output response for three speeds
  • Features bright, visible laser spot to simplify alignment

Product Specifications

Supply Voltage and Current12 to 24V dc (10% max. ripple); 108 mA max. @ 24V dc or [2600/V dc] mA
Sensing RangeDiffuse:
90% white card:0.3 to 5 m
18% gray card:0.3 to 3 m
6% black card:0.3 to 2 m
Retroreflective:0.5 to 50 m, range is specified using one model BRT-TVHG-8x10P retroreflector
Sensing BeamTypical beam dia.:6 mm @ 3 m
Typical laser lifetime:75,000 hours
Diffuse:658 nm visible red IEC and CDRH Class 2 laser; 0.5 mW max. radiant output power
Retroreflective:658 nm visible red IEC and CDRH Class 1 laser; 0.15 mW max. radiant output power
Supply Protection CircuitryProtected against reverse polarity and transient voltages
Output ConfigurationOne discrete output and one analog output Discrete (switched) output:
SPST solid-state switch:selectable NPN (current sinking) or PNP (current sourcing)
Analog output:0 to 10V dc or 10 to 0V dc (voltage sourcing) or 4 to 20 mA or 20 to 4 mA (current sourcing), depending on model
Output RatingDiscrete (switched) output:100 mA max.
OFF-state leakage current:less than 5 µA
Output saturation:
NPN:less than 200 mV @ 10 mA; less than 600 mV @ 100 mA
PNP:less than 1.2V @ 10 mA; less than 1.6V @ 100 mA
Analog voltage output:2.5 k ohms min. load impedance
Analog current output:1 k ohms max. @ 24V; max. load resistance = [Vcc-4.5/0.02 ohms]
Output Protection CircuitryProtected against short circuit conditions
Output Response TimeDiscrete outputs:
Fast:1 millisecond ON/OFF
Medium:10 milliseconds ON/OFF
Slow:100 milliseconds ON/OFF
Diffuse analog output (-3 dB):
Fast:450 Hz (1 millisecond average/1 millisecond update rate)
Medium:45 Hz (10 milliseconds average/2 millieconds update rate)
Slow:4.5 Hz (100 milliseconds average/4 millisecond update rate)
Retroreflective analog output (-3 dB):
Fast:114 Hz (6 milliseconds average/1 millisecond update rate)
Medium:10 Hz (48 milliseconds average/1 millisecond update rate)
Slow:2.5 Hz (192 milliseconds average/1 millisecond update rate)
Delay at Power-up1 second; outputs do not conduct during this time.
Color SensitivityDiffuse:
90% white to 18% gray:less than 10 mm
90% white to 6% black:less than 20 mm
Analog LinearityDiffuse:±30 mm from 0.3 to 1.5 m; ±20 mm from 1.5 to 5 m; specified @ 24V dc, 22° C using a 90% reflectance white card
Retroreflective:±60 mm from 1.5 to 50 m (0.12% of full scale); specified @ 24V dc, 22° C using supplied BRT-TVHG-8X10P
Discrete Output HysteresisDiffuse:
Fast:10 mm
Medium:5 mm
Slow:3 mm
Fast:20 mm
Medium:10 mm
Slow:6 mm
Temperature EffectDiffuse:less than 2 mm/° C
Retroreflective:less than 3 mm/° C
Minimum Window SizeDiffuse:20 mm
Retroreflective:40 mm
Remote TEACH Input18 k ohms (65 k ohms @ 5V dc)
Remote TEACHTo TEACH:connect yellow wire to +5 to 24V dc
To disable:connect yellow wire to 0 to +2V dc (or open connection)
AdjustmentsResponse speed:Push button toggles between fast, medium and slow (see Output Response Time)
Window limits (analog or discrete):TEACH-mode programming of near and far window limits. Limits may also be taught remotely using TEACH input.
Analog output slope:The first limit taught is assigned to minimum output current or voltage (4 mA or 0V dc)
Laser ControlConnect red wire to +5 to 24V dc to enable laser beam; connect to 0 to +1.8V dc (or open connection) to disable; when sensor is powered laser enable time is 100 millisecond delay on enable, when sensor is powered.
IndicatorsGreen Power ON LED:indicates when power is ON, overloaded output and laser status
Yellow Output LED:indicates when discrete load output is conducting
Red Signal LED:indicates target is within sensing range and the condition of the received light signal
Yellow Speed LED:indicates the response speed setting
Red/Yellow TEACH LEDs:in programming mode; indicate active output(s)
ConstructionHousing:ABS/polycarbonate blend
Quick-disconnect:ABS/polycarbonate blend
Environmental RatingIP67; NEMA 6
Connections7-conductor (with drain) 2 m or 9 m shielded PVC-jacketed attached cable, or 8-pin Euro-style quick-disconnect fitting. QD cables are ordered separately.
Operating ConditionsTemperature:0° to +50° C
Relative humidity:90% @ 50° C (non-condensing)
Application Notes• For best accuracy, allow 30-minute warm-up before programming or operating

• Retroreflective performance specifications are based on use with supplied BRT-TVHG-8X10P high grade target. Results may vary with other retroreflective target materials.


Data Sheets

Document Name Part Number File Size Download
1. LT3 Series with Class 2 Laser
(Analog and Discrete Outputs)
65742 Download
2. LT3 Series with Class 1 Laser, Analog 68504 Download

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