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Snow Pack Analyser SPA-2

Make:   Sommer                                      Model:  SPA-2
✅ The SPA sensor measures the specific volume contents of liquid water and ice in the snow pack.
✅ Masurand : Snow depth, Snow water equivalent (SWE), Snow density, Liquid water content and ice content.
✅ Sensor Type : Ultrasonic.
✅ Signal Output : RS 485 / SDI-12; various ASCII formats
✅ Supplied With: Factory test/ Calibration Certificates.

Snow Pack Analyser SPA-2:

Automatic and continuous measurement
To measure certain snow parameters can be a challenging task. Therefore, several different variables have to be measured to be able to provide reliable information about the whole snow pack. In addition, snow has a considerable variability in space and time. Until now, only punctual measurements for certain values were possible. With its strap sensors and different system assembly versions the Snow-PackAnalyser System (SPA) now constitutes a revolutionary innovation for an automatic, continuous, and most importantly areal measurement of the parameters snow depth, snow water equivalent (SWE), snow density, and the contents of liquid water and ice. For this reason the significance and reliability of the data about the snow pack‘s state can be increased substantially.
The SPA enables a modern, up-to-date data recording with a high resolution over time. Moreover, the system helps to reduce the often dangerous and expensive employment of staff in wintry terrain.

Recording all important parameters of the snowpack

The SPA-2 system records automatically and continuously all important parameters of the snowpack and allows, for example, predictions about the snow melting progress. The latest product generation, the SPA-2, now offers a completely new and much more user-friendly control interface. Connecting analog sensors has become a lot easier, and the new standard for data outputs is realized via an RS-485 or SDI-12 interface.

Installation and measuring principle

The SPA-2 station can be operated autonomously (using solar power), and the mast and frame are set up in a suitable position on level ground. The weather- and UV-resistant sensor band penetrates the snow and measures the volumetric content of ice, water, and air in the snowpack using impedance analysis. The snow depth measurements are taken by our reliable ultrasonic snow depth sensor, the USH-8. Data storage and remote transmission equipment mounted in a weatherproof control cabinet can be provided additionally upon the customer’s request.

Application and features of Snow Pack Analyser SPA-2:



✅ Water supply and management
✅ Hydropower plants
✅ Flood prevention authorities
✅ Agriculture, mining
✅ Hydrology
✅ Alpine communities, skiing resorts
✅ Research facilities
✅ Recording of the snow parameters
✅ Sensor integration via RS 485 or SDI-12 interface
✅ Energy-saving sensor operation
✅ Comfortable parametrisation
✅ Information about SWE, snow density, liquid water and ice content





6360 mm x 1100 mm x 3700 mm (L x W x H),
SPA Sensor:- Length horizontal strap: 4.8 m,
Sloping strap: 4.8 m (standard), resp. 6.7 m, Width: 60 mm


RS 485 / SDI-12; various ASCII formats

Power Supply

Supply voltage: 9 … 15 VDC reverse voltage protection, overvoltage protection

Power Consumption

Active: 65 mA (sleep-mode: 1 mA)

Measurement Range

Snow depth: 0 … 2.5 m, 0 … 5 m,
SWE (mm of water): 0 … 1000 mm, H2O 0 … 3000 mm H2O,
Density: 0 … 1000 kg/m³,
Volumetric water content: 0 … 100 %,
Volumetric ice content: 0 … 100 %

Operating Environment

-35 … +60°C


Weatherproof, UV resistant sensor strap, reinforced with Kevlar cords


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