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LDM 41 A / LDM 42 A
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Laser Distance Sensors
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| Applications LDM41A / LDM42A |
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- Measurement of distance and position
- Diameter measurement of rolls / coils
- Level measurement
- Position control
- Security application
- Observing and measurement for elevators
- Position measurement for cranes and conveyors
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| Description of LDM41A and LDM42A |
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The LDM 41/42 A is a opto-electronic distance sensor for industrial application, like distance and position measurement without use of special reflectors.
The target could be nearly any kind of natural surface.
The sensor works based on comparative phase measurement.
It emits modulated Laser light which is diffusely reflected back from the target with a certain shift in phase to be compared with a reference signal.
From the amount of phase shift, a required distance can then be determined with millimeter accuracy.
A visible red Laser beam enables easier sighting.
The LDM 42 A is designed for fast measurement on white target.
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| Characteristics of LDM41A and LDM42A |
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- millimetre precise measurement at various surfaces (LDM 42 A only for white surface)
- long range reflector-less distance measurement, with additional reflectors on the object over 100m with additional reflectors mounted onto target
- high availability under in the high temperature area with high precision
- big supply voltage range 10 V until 30 V DC
- risk less use because of laser class 2
- simple alignment with a visible laser class
- bi-directional data-interface, switching and analogue output
- simple setup for parameter with a PC or laptop
- measured values are displayed in meters, decimetre, centimetre, feet, inch etc. due to free scaling
- stable and simple to installing housing with protection IP 65
- Profibus DP via UNIGATE Gateway
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Drawing LDM41A and LDM42A
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| Technical Data LDM41A and LDM42A |
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| Measuring range*1 |
0.2 m up to 30 m with natural surfaces, more than 100 m achievable, depending on target reflectance |
| Measuring accuracy*2 |
± 2 mm under defined measuring conditions *3; else
± 3 mm (+15 °C up to +30 °C), ± 5 mm (-10 °C up to +50 °C) |
| Resolution |
0.1 mm, user scalable |
| Reproducibility*4 |
0.5 mm |
| Measuring time |
0.16 up to 6 s programmable or auto in Mode DT
0.1 s in Mode DW on white surface
20 ms in Mode DX on white surface (only LDM42A)
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| Laser Class |
LK2 under DIN EN 60825-1:2001-11
(<1 mW, visible red) |
| Laser divergence *5 |
0.6 mrad |
| Operating temperature |
-10 °C up to +50 °C |
| Storage temperature |
-40 °C up to +70 °C |
| Supply voltage |
10 V up to 30 V DC |
| Power consumption |
approx. 1.5 W |
| Interfaces *6 |
RS 232 or option RS 422; 2400, 4800, 9600, 19200, 38400 Baud, ASCII, format 8N1;
programmable mode, scaling, measure time;
output of measure values, internal temperature and error codes
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| Digital switching output |
"high-side switch", programmable switching threshold and hysteresis, max. load of 0.5 A |
| Analog output |
4 mA to 20 mA current output; programmable distance range limits, load resistance < 500 Ohm |
| Enclosure |
Aluminium |
| Dimensions |
approx. 212 x 96 x 50 (L x W x H) in mm |
| Weight |
approx. 850 g |
| Protection |
IP 65 |
| Shock stability |
10 g / 6 ms (DIN ISO 9022-3-31-01-1) |
| MTTF |
100,000 hours at 25 °C |
| Mounting |
100 x 85 in mm, 4 x M6 holes |
| Scope of delivery |
Sensor, 2 m cable one side open, User Manual, test version of LDMTool |
| *1 |
dependent on target reflectance, stray light influences and atmospheric conditions |
| *2 |
statistic spread 95 % |
| *3 |
for measurement at a planar white target surface, approx. 20 °C |
| *4 |
dependent on target reflectance, stray light influences and atmospheric conditions |
| *5 |
at 10 m distance the beam diameter is 6 mm, at a distance of 100 m it is 6 cm |
| *6 |
RS422 option to specify when ordering! |
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