Xiangtan XiangkeDRESeries transient methodThermal Conductivity TesterIntroduction
I. Overview
DRESeries Thermal Conductivity Test Instruments are a non-steady-state testing method based on the hot wire principle, utilizing dual hot wires、Single-line hotline、Cross Line、Parallel Lines、Flat Heat Source、Probe and sensors are suitable for thermal conductivity measurement of various types of materials.
DRESeries InstrumentsThe advantages include:
(1) Directly measuring heat transfer can save a great deal of time.
(2) No content provided.Steady stateThe same is affected by contact thermal resistance.
(3) Sample preparation is quite simple.
DRESeries instruments are widely applicable in material thermal analysis testing for universities, research institutions, quality inspection departments, and manufacturing factories of all sizes.
Two, Key Technical Specifications
III. Measurement Principle
DRE-2ASingle or dual热线sensor used in the model instrumentThis sensor is specifically designed for measuring non-conductive liquids. The heating wire serves both as a heating element and a temperature sensing element. The dual heating wire configuration adds a short auxiliary wire to compensate. Such sensors are only suitable for measuring non-conductive materials that can be easily contacted without force (e.g., gases, liquids), due to their thin and exposed heating wires.
DRE-2BThe model instrument employs a miniature probe sensor.AvailableUsed for measuring liquids, powders, pastes, and loose materials.The Hot Wire Probe method is an improvement of the Hot Wire technique, involving encapsulating an electric heating wire into a small-diameter metal tube. The electric heating wire inside the probe serves both as a heating element and a temperature sensing element.These sensors, with their protective casing, offer certain corrosion resistance and mechanical strength, broadening their range of applications, butThe probe has a certain volume and heat capacity, which can lead to some negative impacts, such as measurement errors for lightweight, low heat capacity, and low thermal conductivity materials.Will increase。
DRE-2CPlease provide the Chinese content you would like translated into American English.DRE-5CThe model instrument utilizes a flat heat source sensor.Used for measuring powdery, gelatinous, and solid block materials. Transient plane heat source method(Transient Plane Source Method，TPS)It has evolved from the Hotline Law.This method is also referred to as“Gustafsson”Probe method orHot DiskFrench，TPSThe probe can be considered as a metal wire(Generally, metal nickel is used.)The bent concentric rings are covered on both sides with a polymer protective layer that exhibits excellent corrosion resistance and mechanical properties. In this method, the probe is a thin sheet with a continuous double helix structure formed by etching conductive metal nickel. The outer layer is coated with a protective layer, which imparts certain mechanical strength to the probe while maintaining electrical insulation between the probe and the sample. The probe is typically placed between two samples for testing. The probe serves both as a temperature sensor and a heating source.(Self-heating sensor)This type of sensorPossesses a certain volume and heat capacity.ForMeasure lightweight, low thermal capacity, and low thermal conductivity materialsThe test error will all increase significantly.。
DRE-2DThe model instrument features a large probe sensor.Used for measuring powders, pastes, granular, and loose materials.It encapsulates a heating wire into a slender metal tube and installs a temperature-sensing element in the middle of the heating wire. Such a probeIt possesses adequate mechanical strength, allowing it to be directly inserted into loose materials such as soil, sand, grain, etc., for measurement. ButForMeasure lightweight, low thermal capacity, and low thermal conductivity materialsThe test error will all increase significantly.。
DRE-2EThe model instrument utilizes a crossed热线（or cross-line）sensor.Used for measuring powdered and solid block materials. A thermocouple is welded in the middle of the heating line to measure the hot line temperature. The diameter of this hot line is much thicker than that of a single hot line, making it less prone to breakage. Therefore, it is suitable for measuring powdered and solid block materials and can be used for higher temperature measurements. However, the hot line is bare wire, and the conductive material cannot be directly detected.
DRE-2GThe model instrument employs a single hot-line sensor.Used for measuring powders, solid block materials, especially low thermal conductivity insulating materials. The thermowire serves both as a heating element and a temperature measuring element.This sensor features a heating wire attached to an insulating material. Due to its extremely fine size, it is particularly suitable for measuring lightweight, low thermal capacity, and low thermal conductivity materials.But the hotline is bare wire, and the conductive materials cannot be directly tested either.
DREThe series instruments are configured with main units that operate on similar principles. They consist of sensor interface circuits, hot wire constant current sources, hot wire voltage measurement, hot wire temperature measurement, and computer data processing. During the testing process, the constant current source applies a constant power current to the hot wire, causing it to generate heat. This heat simultaneously diffuses to the sample surrounding the probe. The rate of heat diffusion within the material depends on its thermal diffusion coefficient and thermal conductivity, among other thermal properties. By recording the temperature and the probe's response time, these material properties can be calculated. Thus, this method is both quick and convenient, and also highly accurate.
