Soil heat flux sensor Heat flow measurement instrument for measuring the heat flux inside the soil

    Soil heat flux sensor (also known as "soil heat flux plate", "heat flow meter") is mainly used to measure the energy balance of the soil and the thermal conductivity of the soil layer.

    The soil heat flux sensor measures temperature gradients using a thermopile consisting of two different metallic materials. Thermopile detectors receive thermal radiation, which can generate a thermoelectric potential between junctions of two dissimilar materials.

The heat flux sensor outputs in the form of voltage, the voltage is proportional to the heat flux, the output voltage is a millivolt signal, and the millivolt signal is read by the data acquisition system.

This product has high measurement accuracy, convenient use and maintenance-free, and can be widely used in various environmental monitoring.

technical parameter：              

Measuring range: -500~500W/m2

Accuracy: ±5%

Power supply: 12-24V/DC 5V

Output form:-100mV~100mV/0~2.5V/RS485

Instrument cable length:10 meters

Working temperature: -40℃～50℃

Working humidity: 0~100%RH

Transmitter size:

Instructions for use：

   The installation of the soil heat flux sensor should select a representative place within the research range. If the surface layer is more complex, the sensor should be placed in an effective part with a lower coverage and a more balanced soil heat flux.

    During use, be sure to pay attention to the front and back of the heat flux sensor, the correct placement is the front side up.

   First, use a small shovel to dig a vertical hole, determine the distance from the heat flux sensor to the top of the ground according to the user's requirements, then use a small knife to make a horizontal cut in the side of the hole, try to keep the soil surface intact, or the minimum Without being damaged, insert the heat flux sensor into the horizontal cutout. In order to obtain accurate soil heat flux, it is necessary to ensure that the heat flux plate is in full contact with the soil.

   Remember, do not lead the output wire of the heat flux plate directly to the soil surface. A small section of the output wire of the heat flux plate should be buried in the soil to reduce the heat conduction of the output wire.

   After all sensors are installed, be sure to return the excavated soil to its original position as soon as possible.

During the year, the soil heat flux changes with the change of seasons. In summer, the soil heat flux is positive, that is, there is heat entering the soil layer, and the amount is large; in winter, the soil heat flux is negative, and the soil heat flux is negative. The heat is released to the atmosphere, but in small amounts.

Soil heat flux sensor, also known as soil heat flow plate, heat flux plate, heat flow meter, soil heat flux sensor is a traditional soil thermal performance tester, mainly used to measure the energy balance of the soil and the thermal conductivity of the soil layer, its value depends on the temperature gradient between the upper and lower soil layers and the thermal conductivity of the soil, the heat flux value inside the object being measured are relatively small, because the sensor body through the ceramic -Since the body of the sensor is made by mixing ceramic and plastic, the overall thermal resistance is guaranteed to be very low.

During the year, it varies with the seasons, with positive soil heat flux in summer, when both heat enters the soil layer and the value is larger, and negative soil heat flux in winter, when the heat in the soil is released to the atmosphere, but the value is smaller.

Heat flow calculation formula

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

Scope of application

This product can be widely applied to measure the heat flow in the walls of buildings and in the soil.