Accueil Sensors Automatic cryopedometer

Smart cryopedometer

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Description

Cryopedometers, placed at particularly sensitive points of the road network, can automatically monitor the temperature of the road and ground at varying depths, to accurately track the changes in the depth of frost in the roadway and to inform technical staff of the risks of thaw barriers.

 

The length of cryopedometer, the number of temperature measuring points and their depth is determined by the needs of the customer.
The probe can accommodate up to 16 measurement points at a maximum depth of 2 meters.
It is possible to add a surface temperature measuring point at the request of the client.

 

Laying a cryopedometer in the road is simple.
The cryopedometer is sealed vertically in the road after a simple coring. Its cable runs into a channel.

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The vertical sealing of the cryopedometer allows for accurate monitoring of temperature changes in the different layers of the road.

The collected data is automatically transferred through the cable.
The automatic smart cryopedometer therefore requires no travel to retrieve temperatures.

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Characteristics

Mechanical characteristics

Dimensions : length up to 200 cm / 3.7 cm diameter
Weight : about 3 kg (excluding cable) for a standard 90 cm model
Material : stainless steel
Connection :
19 strand cable / 500 m maximum
Protection : resists shearing in road sub-layers

Main features

Temperature sensitive elements : up to 16 points*
Temperature measurement range :
- 40°C to + 60°C
Accuracy :
± 0,1°C

 

*The number of cryopedometer measuring points, their depth and the gaps between them is determined by the needs of the customer.

 

In standard format, the cryopedometer allows for 16 measurement points distributed every 5 cm to a depth of 80 cm.

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Use of data

Unlike the manual cryopedometer, the automatic cryopedometer requires no travel to retrieve temperatures.


It can be connected to various components to communicate data directly:

  • GPRS MODEM
  • Public Switched Telephone Network (PSTN)
  • Fibre optics
  • Weather station
  • Portable console/handheld case (for direct readings i.e. patrolmen )

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The smart cryopedometer may be associated with a roadside cabinet in which a battery can power a GPRS MODEM and its antenna.
The power consumption of the station is low, the battery life can be calibrated to cover the electrical needs of a winter road maintenance season (6 months for example).
A solar panel can also be added to ensure continued power supply.

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Connected to the internet, the cryopedometer communicates its data directly.
Temperature curve readings and 2 year log are available on the website of METEO OMNIUM.

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Thaw barrier

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The thaw barrier is a French road traffic regulation for thawing periods, usually in the form of a provisional tonnage limitation, in order to protect the foundations of the road.

When the frost enters the road from the surface, it goes down more or less deeply depending on:

  • the severity and duration of the frost
  • the nature of the road and its thickness
  • the nature and condition of the foundation
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Frost penetration causes a significant water suction from the lower layers.

The thaw starts from the road surface.
Excess water released by the thaw is trapped in the foundation which is not completely thawed.
The road "floats" on the foundation rendered inconsistent by the presence of large amounts of water: it is then caught between the hammer (heavy weights) and anvil (frozen foundation).

The foundation is completely thawed but is still waterlogged.
This water drains very slowly into the soil.
The roadway continues to rest on an inconsistent support.

After a while, the foundation water is completely evacuated.
The road rests once again on firm ground.

Realisations

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