Accueil Sensors Automatic cryopedometer Cryopedometer with PT100

Cryopedometer with PT100

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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.
In standard format, the cryopedometer allows for 5 measurement points : -10 cm, -20 cm , -40 cm, -70 cm, -100 cm.



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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Mechanical characteristics

Dimensions : 105 cm (length) / 5 cm* (diameter)
Weight : 10 kg*
Material : stainless steel
Connection : 15 strand cable
Protection : resists shearing in road sub-layers

Main features

Temperature sensitive elements : platinum probe (PT100) 3 fils
Temperature measurement range :
- 40 °C to + 60 °C
Accuracy :
± 0,1 °C
Number of measuring points :
from 1 to 10 PT100*

* The length of cryopedometer, the number of temperature measuring points PT100 and their depth is determined by the needs of the customer.

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Use of data

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

Connected to a measurement station, the cryopedometer communicates its data directly.

Temperature curve readings are available on a local PC and/or the Internet.


Thaw barrier


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


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.