Vaisala Ground Cast Sensor


  • Reports observations with enhanced point forecasts
  • Wireless and self-powered
  • 3+ year battery lifetime
  • Temperature at 3 levels: surface, −6 cm, −30 cm (−2.4 in, −11.8 in)
  • Treatment material amount
  • Surface state (dry / not dry)
  • Drilled to road, installation takes less than 30 minutes
  • Can be installed to various lane locations, including wheel track
  • Maintenance-free due to selfleveling cushion mechanism (patent-pending)
  • Low power NB-IoT communication
  • Data available through Vaisala Wx Horizon or API

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensor solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala Ground Cast Sensor provides an easy and a€ffordable way to get key road weather measurements from critical locations that have not been covered before. It measures road temperature and the amount of treatment materials with the same performance as Vaisala’s industry-leading road weather stations. Ground Cast Sensor includes a patent-pending wear-with-road mechanism that ensures the sensor stays always leveled with the road surface. As a result, the sensor does not need maintenance during its lifetime, unlike conventional embedded sensors that may need annual grinding on roads where studded winter tires are used. The completely sealed construction makes the sensor incredibly robust and helps to minimize the risk of water leakage.



Measurement Performance
Surface temperature
Measurements 0, −6, and −30 cm (0, −2.4, and −11.8 in)
(below surface)
Measurement range (−40 … +70 °C) (−40 … +158 °F)
Measurement accuracy ±0.2 °C (±0.4 °F) at −40 … +70 °C
(−40 … +158 °F)
Chemical amount
Supported de-icing chemicals Sodium chloride (NaCl)
Calcium chloride (CaCl2)
Sodium acetate (NaOOC2H3),
Potassium formate (KOOCH)
Magnesium chloride (MgCl)
Reporting unit g/m2
Surface Dryness
Reported surface states Dry, not dry 1)
1) Sensor measures if there are any contaminants on top of it, but it does not differentiate between water, ice, and snow, for example. Situations other than dry are reported as “not dry”.
Operating Environment
Operating temperature 1) (−40 … +70 °C) (−40 …+158 °F)
Storage temperature 2) Recommended max. +30 °C (+86 °F)
Operating humidity 0 … 100 %RH
IP rating IPX8: Water immersion tested under
the following conditions:
• Immersion depth: 20 m (65 ft)
• Immersion time: 140 hours
1) In extreme cold conditions where road temperature stays continuously below −20 °C (−4 °F) for multiple days, sensor battery operation might temporarily degrade.
2) Recommendation from the battery manufacturer.
communication & Data Collection
Communication standard Narrowband IoT (NB-IoT)
SIM card type Micro-SIM (3ff) provided by Vaisala
Local connection for sensor setup NFC, disabled after installation
Software for sensor setup Vaisala Android application
Data message interval Every 10 minutes
Data storage location Vaisala cloud
Data access options Vaisala Wx Horizon user interface
Vaisala Wx Horizon API
Vaisala RoadDSS user interface
Mechanical Specifications
Dimensions (H × Ø) 353 × 56 mm (13.90 × 2.20 in)
Weight 640 g (1.4 lb)
Materials Polyurethane (PUR)
Type Lithium-thionyl chloride
Lithium metal content 9 g per sensor, sensor includes
2 built in, non removable batteries
(4.5 g / 0.010 lb each)
Recommended installation hole size Ø 60 mm
Depth: min. 360 mm (14.17 in)
Requirements for surface material 1) Paved (asphalt, concrete)
Recommended installation sealants 2) Fabick MP-55
1) Sensor is not designed to be installed in sand or gravel roads, as it will not stay on the surface level, and the sensor performance is optimized for paved surfaces.
2) Vaisala recommends the use of Fabick sealant, but it is not available in all countries. For using locally available sealants, please check the suitability with Vaisala.
EU directives EMC Directive (2014/30/EU)
EMC compatibility EN 61326 1, industrial environment
CISPR 32 / EN 55032, Class B
FCC part 15, class B
ICES 3 (B)
Electrical safety IEC 62368-1
Cold IEC 60068 2 1
Dry heat IEC 60068 2 2
Change of temperature IEC 60068 2 14
Damp heat, cyclic IEC 60068 2 30
Damp heat IEC 60068 2 78
Compliance marks CE


Vaisala-Ground Cast Sensor_DpstarGroup