The laser-based snow depth sensor Lufft SHM31 stands for millimeter-accurate snow level detection over long distances in all weather conditions without any maintenance, due to opto-electronic/laser based rangefinder technology.
Millimeter-accurate snow levels in all weather conditions: The SHM 31 operates with a visible, easy-to-measure measuring beam. The snow depth is given up to 15 meters within seconds, millimeter-accurate and reliable. Various heating functions significantly extend the lifetime of the laser diode and allow high-quality measurement data in all weather conditions. Regular maintenance becomes redundant with the SHM 31. A very robust housing and an elaborate operation principle allows almost no maintenance work throughout the lifetime of the sensor.
Main Features of the Snow Height Sensor Lufft SHM31:
- Parameters measured - snow depth
- Measurement technology - opto-electronic measuring technique (rangefinder; laser distance sensor) with eye-safe laser
- Product highlights - determination of snow depth over long distances, heating options allow high quality measurements in all weather conditions, simplified installation due to automatic inclination angle compensation
- Interfaces - RS485 & RS232 with Modbus RTU, UMB, UMB-ASCII 2.0 & SDI12 protocol
- Measurement of millimeter-accurate snow levels over long distances
- Various heating functions significantly extend the lifetime of the laser diode and allow high-quality measurement data in all weather conditions
- Compact and weatherproof housing
- Built-in automatic angle meter allows simplified installation.
- Effective suppression of scattered light
- Differentiation between snow and other natural surfaces
- Optical measuring method is independent of temperature or wind fluctuations and thus offers a great advantage over conventional ultrasonic sensors
- Maintenance-free operation: no calibration or exchange of desiccant
- Part of (alpine) meteorological observation stations from weather services around the world
- Traffic and aviation safety, road surveillance
- Snow level detection for winter sport areas
- Water & energy related applications/industry
Specifications Snow Height Sensor Lufft SHM31
| General |
| Dimensions (LxWxH) |
302 × 130 × 234 mm |
| Weight |
2.35 kg |
| Operating parameters |
| Temperature range |
-40...+50 °C |
| Relative humidity |
0...100% |
| Measuring parameters |
| Snow Depth |
0...15 m |
| Mounting distance to surface |
0.1...16 m |
| Accuracy (snow depth) |
± (5 mm + 0.06 %) |
| Repeatability |
0.6 mm |
| Intermediate precision/ reproducibility |
5 mm |
| Data-interfaces |
| RS485 |
Modbus RTU , ASCII, UMB protocol |
| RS232 |
ASCII protocol |
| SDI-12 |
SDI-12 protocol |
| Data transfer mode |
Polling (UMB, ASCII, SDI-12); Auto telegram output (ASCII) |
| Electrical parameters |
| Typ. power consumption at 24 VDC and 10 s measurement interval |
Without heater: approx. 0.7 W; with window heating: approx. 3.4 W |
| Power supply |
12 or 24 VDC, tolerance +/- 15% |
| Maximum power consumption(connecting power with heater on) |
18 W |
| Safety |
| Laser classification |
Laser class 2 (IEC 60825-1:2014); complies with 21 CFR 1040.10 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007 |
| Protection class |
IP68 |
| EMC |
EN 61326-1:2012 (industrial standard) |
| EC |
2014/30/EU & RoHS 2011/65/EU |
