LDM41A and LDM42A

Robust and precise laser distance sensors up to 100 m

The LDM41A is an optoelectronic distance measuring device for industrial applications with an analogue interface (4 mA to 20 mA).
It works contact-free on the principle of comparative phase measurement (amplitude modulation) and facilitates precisely accurate measurement of distances.

Function

It distinguishes itself through high precision as well as high independence from the surface of the measuring object. The red, visible laser beam allows for easy alignment. The sister model LDM42A has been further developed for fast distance measurements on white surfaces.

Applications

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

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

Technical Data

Measuring range¹	0.2 m ... 30 m on almost all natural surfaces, over 100 m achievable depending on the degree of reflection of surfaces
Measuring uncertainty²	±2 mm under defined measuring conditions³ ±3 mm (+15 °C ... +30 °C) ±5 mm (-10 °C ... +50 °C)
Resolution	0.1 mm, freely scalable
Reproducibility⁴	0.5 mm
Measuring time	0.24 s ... 6 s adjustable or automatically in mode DT 0.1 s in mode DW on white surface 20 ms in mode DX on white surface (only LDM42A)
Laser divergence⁵	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
Storage temperature	-40 °C ... +70 °C
Supply voltage	10 V ... 30 V direct currents
Power consumption	Ca. 1.5 W
Serial interface⁶	RS232 or optional RS422, max. Baud rate 38400, ASCII, setting of measuring functions, scaling, measuring time via commands, display of measured values, internal temperature and error code
Switching output	Programmable switching threshold and hysteresis, "high side" switch, maximum load 0.5 A
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 anodized
Size (LxBxH)	187 mm x 96 mm x 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

Remarks on the technical data of the LDM41A and LDM 42A

¹	Dependent on target reflectance, influence of extraneous light and atmospheric conditions
²	Statistical spread of 95 %
³	Measurement on planar, vertical white surface at standstill or in continuous movement, + 15 °C to +30 °C
⁴	Dependent on target reflectance, influence of extraneous light and atmospheric conditions
⁵	At a distance of 10 m the beam diameter is 6 mm, at 100 m it is 6 cm
⁶	Please specify option RS422 when placing the order