Soil heat flux sensor

1. Product overview of soil heat flux sensor

Soil heat flux sensor is also called soil heat flux transmitter and soil heat flow meter. The soil heat flux sensor is a reflection of the heat exchange between the soil surface and the deep layer. For measurements inside the soil. Can be used for soil internal measurements. It outputs in the form of voltage through a thermopile, the voltage is proportional to the heat flux, it is easy to operate, especially suitable for measuring the thermal conductivity of soil and building walls, glass walls. Soil heat flux values measured using heat flux panels buried 2 cm into the soil. During the year, it changes with the seasons. In summer, the soil heat flux is positive, and the heat enters the soil layer, and the value is large; in winter, the soil heat flux is negative, and the soil heat flux is negative. Heat is released to the atmosphere, but to a lesser extent.

2. Application scope of soil heat flux sensor

This product can be widely used in environment, agriculture, forestry, planting, construction, and other fields.

3. Technical parameters of soil heat flux sensor

Power supply voltage: □12-24V□5V

Output signal: □Current type 4～20mA □0-2V □RS485 customized

Measuring range: -200 to 200 w/m2

Internal resistance is less than 300Ω

Measurement accuracy: less than 5%

Heat flow calculation formula

Heat flow (w/m2) = coefficient (w*m-2/mv) * output (mv)

Working current: about 26mA on 12V

4. Functional characteristics of soil heat flux sensor

1. Small size, fast and accurate measurement

2. Low power consumption design, using reasonable power consumption control mode

3. Stable performance

5. Measurement method of soil heat flux sensor

1. Soil heat flux sensor measurement method in soil

The board should be placed perpendicular to the direction of heat flow and placed horizontally in the soil layer. The buried depth of the sensor is usually 3-10 cm deep from the natural underlying surface. It should be avoided as far as possible to be placed directly on the surface of the soil layer, because the natural underlying surface is not a geometric plane, and the small fluctuations on the surface will make the sensor readings lose representativeness. At the same time, the upper surface of the sensor is directly in contact with the air, and radiation errors may also occur. Usually, a representative section is selected in the observation site, and a section is dug vertically downward with a shovel.

Measure the required depth from the soil surface down along the profile, and then hollow out along the horizontal direction. Soil backfill. But it should be noted that the buried depth of the heat flow plate should be the distance between its center line and the soil surface.

2. Measurement method on the wall of soil heat flux sensor

First, evenly coat the surface of the heat flow sensor with petroleum jelly, and stick the heat flow sensor coated with petroleum jelly on the surface of the wall so that the wall and the heat flow sensor can be in close contact. After staying for a few minutes, the heat flow sensor can start measuring after it adapts to the ambient temperature.