| Physical and environmental | |
| Power supply | 9…28 VDC; Reverse voltage protection, overvoltage protection |
| Power consumption at 12 VDC | max. 50 mA active <1mA in sleep mode |
| Outputs | RS-485 SDI-12 Analog output 4…20 mA (14 bit, max. load 200 Ω) Digital output (low: 0V, high: Vsupply, max. 30 mA at V supply -0.5 V) |
| Operating temperature | -40…60 °C (-40…140 °F) |
| Storage temperature | -40…60 °C (-40…140 °F) |
| Environmental humidity | 0…100 %rH |
| Protection rating | IP 68 |
| Lightning protection | Integrated protection against indirect lightning with a discharge capacity of 6 kA Ppp |
| Housing material | Aluminium |
| Size L x W x H | 2800 x 2400 x 103 mm (110.24 x 94.49 x 4.06 inch) |
| Surface area | 6.72 m² |
| Weight | 110 kg (242.5 lb) |
| Max. inclination | 5° |
| Snow water equivalent (SWE) | |
| Measurement range | 0… 1000 mm SWE 0… 2000 mm SWE 0… 3000 mm SWE |
| Accuracy | 0…500 mmWC: ±1 mmWC 500 mmWC … Full scale: ±0.2 % of reading |
| Resolution | 0.1 mmWC (0.1 kg/m²) |
| Measurement interval | 10 s…3 h |
| Temperature measurement | |
| Temperature sensor | Pt1000 |
| Measurement range | -40…60 °C (-40…140 °F) |
| Accuracy | 0.2 °C (0.35 °F) |
| Resolution | 0.01 °C (0.02 °F) |
The SSG-2 Fluidless Snow Pillow (Snow Scale) is a precision Snow Water Equivalent measuring device which is developed for quick and easy installation and implementation in the field. A broad outer frame of plates minimizes the effects of ice bridging commonly experienced late in the measurement season. The use of lightweight aluminum materials minimizes thermal resistance improving heat flow throughout the device for better emulation of natural conditions.
The working principle of the SSG-2 is based on the measuring principle of load cells. The sensor consists of seven perforated plates, each plate measuring 31.44″ x 47.16″(inches). The center panel and six surrounding panels allow water to percolate through the sensor. Water percolation minimizes thermal differences between the sensor and surrounding panels act to buffer the center panel, where SWE is measured, from stress concentrations that develop along the perimeter of the sensor. This system allows accurate measurement even during periods of rapid snow settlement following large snow accumulations.
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