Fig. 2: SPA-sensor
Fig. 3: IASP control unit
2.1. SPA-sensors
The SPA-sensor is a 6 cm wide flat ribbon sensor including three copper wires. The length varies between
3 and 10 m. Its ends are terminated by boxes including mounting rings. The connection cable is led out of
one box.
2.2. Correction length sensor (potentiometer)
The deforming of sloping sensors due to the snow pack can be corrected by measuring the additional
length of the sensor rope at the suspension. The sensor measures the rotation of the suspension roll and
converts the values into length. The correction is automatically included in the calculation.
2.3. Snow depth sensor
The snow depth sensor USH-8 is based on transit-time measurements of an ultrasonic pulse between the
sensor and the snow surface. It is mounted with an extension arm on a mast and is directly connected to
the control unit.
The snow depth is an essential parameter to calculate the snow pack parameters of sloping sensors. On
one hand the length of the sensor in snow is determined and on the other hand the total SWE is
calculated using the actual snow depth.
2.4. Control unit IASP
The control unit IASP performs all measurements, switches between sensors and calculates the snow
parameters with respect to snow depth, length correction and geometric parameters. The data is output
via a RS-232 interface.
The analogue input F2-1 (#1) is preadjusted for the length correction. The analogue input F3-3 (#6) is
preadjusted for the USH-8 snow depth sensor.
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