1.1. Tc-3900 differential scanning calorimeter is a new type of thermal analysis instrument with three characteristics of intelligence, miniaturization and unit combination. It is widely used in the melting, solidification, decomposition, combination, reduction and oxidation, crystallization, phase diagram production, catalyst research and development of materials. It is the main analysis means of organic, inorganic, polymer, mineral, petrochemical, textile, medicine and other aspects, with a convenient computer data processing system. This machine is equipped with glass transition temperature function and oxidation induction period function. The operation software can enlarge or reduce the function arbitrarily, making the whole interface friendly and easy to operate

1.2. This model is composed of main engine, small heating furnace, Microvolt amplifier, a / D converter, data acquisition system, cooling system, gas flow control system, temperature measurement by thermocouple, real-time acquisition of sample changes (heat absorption or heat release) under program temperature control, temperature control by platinum resistance method, main engine window is displayed by LCD without opening the computer It can display the current working condition in real time; the panel button can transform the temperature between "heating, constant temperature and stop", and the temperature tracking can be realized by pressing the "heating" button when the temperature is raised twice; the gas flow can be switched and closed by pressing the "nitrogen, oxygen and gas off" button; the computer is composed of USB communication (desktop computer, laptop computer), printer and other components, among which It is connected by special connector for easy installation and maintenance.

2、 Main technical specifications and instrument use conditions

2.1 DSC curve parameters

Range: 0 ~ ± 500 ℃ accuracy: 0.1 ℃ resolution: 0.1 ℃

2.2 temperature parameters

Temperature range: room temperature ~ 500 ℃; temperature resolution: 0.1 ℃ (standard metal sample)

Heating rate: 1-80 ℃ / min; temperature control mode: heating, constant temperature (fully automatic program control)

2.3 use of crucible

Aluminum: Φ 6.6mm × 3mm.

2.4 gas control

Gas: nitrogen, oxygen gas flow rate: ≤ 200ml / min gas pressure: 0.2MPa

2.5 microcomputer data processing system

Data acquisition, storage, screen display and result report: temperature calibration and correction, epitaxial starting temperature, glass transition temperature, oxidation induction period, and processing of dynamic parameters.

2.6 normal working conditions of the instrument

Room temperature: 15 ℃ ~ 25 ℃ relative humidity: 55 ~ 75%

Power supply: 220V, 50Hz, power supply needs reliable grounding

The workbench where the instrument is placed shall be solid and reliable, and there shall be no strong vibration, strong electricity, strong magnetic field interference and corrosive gas affecting the accuracy and service life of the instrument.

2.7 fluctuation range

Melting point, glass transition temperature: ± 0.5 ℃ enthalpy variable accuracy: ± 1% △ H

Oxidation induction: constant temperature section: ± 0.3 ℃; gas flow rate: ± 0.1ml/min

3、 Working principle and structure of the instrument

Differential scanning calorimetry (DSC) is a technique to measure the power difference between substance and reference substance with temperature under the control of program temperature. This machine is mainly composed of heating furnace, main engine, Microvolt amplifier, a / D converter, data acquisition system, cooling system, gas flow control system computer, printer and other components, and supported by two-way atmosphere switching. The measurement results are processed by computer data processing system. The schematic diagram is shown in Figure 1.

Temperature control system

The system consists of temperature controller, thyristor, temperature controlled platinum resistance and heating furnace. The computer gives the temperature signal according to the set program temperature. When the temperature control platinum resistance value deviates from the given resistance value, it indicates that the furnace temperature deviates from the given value. The deviation signal is adjusted by the phase-shift trigger and silicon controlled rectifier to make the furnace temperature track the set value well and produce an ideal temperature curve.

Differential scanning calorimeter

certificate

Model: tc-3900

Factory No.: 20200205

Temperature range: room temperature ~ 500 ℃;

Temperature resolution: 0.01 ℃ (standard metal sample)

Heating rate: 1-80 ℃ / min;

Temperature control mode: temperature rise, constant temperature (fully automatic program control)

Inspector: Xu Peng

Test date: February 5, 2020

Qualified in inspection and approved for delivery

Taian Tiancheng testing equipment Co., Ltd

2020-2-5

Packing list

1. Host 1

2. Technical documents

(1) 1 product manual

(2) 1 Certificate

(3) Packing list 1 copy

3. Attached accessories

300 alumina crucibles

1 power cord

One oxygen pipe and one nitrogen pipe

1 standard test sample (indium, tin, zinc)

1 pair of tweezers

1 spoon

Customized pressure reducing valve connector and quick connector 2 pairs

4 fused glass fuses