LDM 41/42 (Minilaser 61)

The LDM 41/42  Laser Distance Measurement Sensor is designed for distance measurement applications in an industrial environment. The LDM 41/42  works based on comparative phase measurement. To achieve this, it emits a visible laser beam with different modulation frequencies. The target being measured returns diffusely reflected light that is subsequently compared with a reference signal. Finally, a microprocessor uses the recorded phase shift to calculate a required distance with mm accuracy. The sensor LDM 41  distinguishes itself through a high precision as well as a big independence of the surface of the measured object. The LDM 42  is design for fast measurement on a white target. The red, well visible laser beam allows a simple alignment.

Operating Principle:

Phase comparison

Features:

• Millimeter precise measurement on various surfaces
• Long range reflector-less distance measurement
• With additional reflectors on the target object measurements over 100 m
• Operation in extreme ambient temperatures with high precision and range
• High supply voltage range between 10 V and 30 V DC with low power consumption
• Safe operation through laser class 2
• Easy adjustment through visible laser beam
• One connection cable for supply voltage, serial data interface, switching and analog output
• Customized parameterization via PC
• Display of measured values in meters, feet, inches and others due to free scaling
• Robust, compact housing, easy to install, protection standard IP 65

Options and Accessories

• Grey filter for signal attenuation
• Mounting bracket
• Digital display for analog signals
• Optional temperature controlled heating
• Protective housing
• Protective housing with water cooling
• Protective tube with purge air connector
• Protective window

Application:

• Distance measurement and determination of position
• Diameter measurement of rolls / coils
• Fill level measurement
• Position control
• Monitoring of safety-relevant parts
• Monitoring of lifting plants / lifting height measurement and positioning of elevators
• Monitoring and positioning of cranes and conveyor systems

Specification:

• Measuring range: 0.2 m … 30 m on almost all natural surfaces
  • Over 100 m achievable depending on the degree of reflection of surfaces
• Measuring uncertainty: ±2 mm under defined measuring conditions
  • ±3 mm (+15 °C … +30 °C)
  • ±5 mm (-10 °C … +50 °C)
• Resolution: 0.1 mm, free scalable
• Reproducibility: 0.5 mm
• Measuring time: 0.24 s … 6 s adjustable or automatic in mode DT
  • 0.1 s in mode DW on white surface
  • 20 ms in mode DX on white surface (only LDM42A)
• Laser divergence: 0.6 mrad
• Laser class: Laser class 2 acc. to DIN EN 60825-1:2001-11 (650 nm, red)
• Operating temperature: -10 °C … +50 °C
  • -40 °C … +50 °C (with optional heating) 6)
• Storage temperature: -40 °C … +70 °C
• Supply voltage: 10 V … 30 V DC
• Power consumption: Ca. 1.5 W
  • Ca. 24 W (with optional heating)
• Serial interface: RS232 or optional RS422, max. Baud rate 38400, ASCII,
  • Setting of measuring functions, scaling, measuring time via commands, display of measured values, internal temperature of the device and error code
• Switching output: Programmable switching threshold and hysteresis,
  • “High-Side” switch, maximum load 0.5 A
• Digital Input: External trigger, 3 V – 24 V, programmable delay
• Analog output: Programmable distance range limits,
  • 4 mA to 20 mA adjustable reaction on error(3 mA, 21 mA or last valid measured value)
• Housing material: Aluminum, powder-coated
• Size: 187 mm × 96 mm × 50 mm
• Weight: 850 g
• Protection class: IP 65
• Shock resistance: 10 g / 6 ms (DIN ISO 9022-3-31-01-1)
• MTBF: 30,000 hours at 25 °C
• Mounting: 4 drill holes for M6 screws, 100 mm x 85 mm