Vaisala IRU-9429 Technical data
IRU-9429 Snow Depth Sensor
www.vaisala.com
Features/Benefits
Range from 150 mm to 10.67 m
▪
(0.5 to 35 ft)
Easy to install
▪
Works on solids and liquids
▪
Easily configured for snow
▪
depth measurements
Internal temperature
▪
compensation
Virtually maintenance free
▪
Self-Contained Ultrasonic
Sensor
The IRU-9429 sensor uses ultrasonic
technology to provide a non-contact
method of detecting snow depth and
presence/absence.
The ultrasonic sensor transmits
pulsed waves of high frequency
sound. If the sound wave meets a
reective object, such as snow, it
bounces back toward the sensor. The
sensor records the time required for
the sound wave to travel to the target
and return. Using the speed of sound,
which is a well-known variable, the
sensor calculates the distance to
the object.
Technical data
General
Operating Range 0.15 to 10.67 m (0.5 to 35 ft.)
Total Current Draw 75 mA @ 12 VDC
Transducer Type Electrostatic
Sample Rate Programmable (1-22 Hz)
Resolution 2.5 mm (0.1 in.)
Accuracy ± 0.25% of detected range (with no temperature gradient)
Operating Temperature -40 to 60°C (-40 to +140°F)
Beam Pattern 9° off axis (at full signal strength and sensitivity settings)
Frequency 50 kHz
Until recently, the many factors
that inuence the speed of sound
created inaccurate readings. Now with
microprocessor technology, many
of these variables can be factored
into the equation and eliminated.
Temperature change is one such
variable. The IRU-9429 sensor uses
internal temperature compensation to
offset the effects of these changes.
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Ref. 2010-11-11 ©Vaisala 2010
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