一、简介：

该差示扫描量热仪为触摸屏式，专测聚合物材料氧化诱导期测试,客户一键式操作,软件全自动运行。仪器符合G B /T 19466.3- 2004/ISO 11357-3 :1999 第6部分氧化诱导期 氧化诱导时间（等温OIT)和氧化诱导温度（动态OIT)的测定。

氧化诱导时间（OIT）是测定式样在高温（200摄氏度）氧气条件下开始发生自动催化氧化反应的时间，是评价材料在成型加工、储存、焊接和使用中耐热降解能力的指标。氧化诱导期(简称OIT)方法是一种采用差热分析法（DTA）以塑料分子链断裂时的放热反映为依据，测试塑料在高温氧气中加速老化程度的方法。其原理是：将塑料式样与惰性参比物（如氧化铝）置于差热分析仪中，使其在一定温度下用氧气迅速置换式样室内地惰性气体（如氮气）。测试由于式样氧化而引起的DTA曲线（差热谱）的变化，并获得氧化诱导期（时间）OIT（min),以评定塑料的防热老化性能。仪器符合G B /T 19466.3- 2004/ISO 11357-3 :1999 第6部分氧化诱导期。氧化诱导时间（等温OIT)和氧化诱导温度（动态OIT)的测定。氧化诱导期已经被纳入管道行业及电线电缆强检范围。

1. Introduction

The differential scanning calorimeter is a touch screen type, which is designed to measure the oxidation induction period test of polymer materials. It is operated by customers with one-key operation and the software runs fully automatically. The instrument complies with GB /T 19466.3-2004/ISO 11357-3:1999 Part 6 Oxidation induction period Oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) determination.

Oxidation induction time (OIT) is the time when the autocatalytic oxidation reaction of the test sample begins to occur under high temperature (200 degrees Celsius) oxygen conditions. It is an index to evaluate the heat-resistant degradation ability of the material during molding, storage, welding and use. The Oxidation Induction Period (OIT) method is a method that uses differential thermal analysis (DTA) to test the degree of accelerated aging of plastics in high-temperature oxygen based on the exothermic reaction when plastic molecular chains are broken. The principle is: Put the plastic sample and the inert reference substance (such as alumina) in the differential thermal analyzer, so that it can quickly replace the inert gas (such as nitrogen) in the sample chamber with oxygen at a certain temperature. Test the change of the DTA curve (differential thermal spectrum) caused by the oxidation of the pattern, and obtain the oxidation induction period (time) OIT (min) to evaluate the thermal aging resistance of the plastic. The instrument complies with GB /T 19466.3-2004/ISO 11357-3:1999 Part 6 Oxidation induction period. Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT). The oxidation induction period has been included in the scope of the pipeline industry and the strong inspection of wires and cables.

二、特点：

1、工业级别的宽屏触摸结构，显示信息丰富，包括设定温度、样品温度，氧气流量，氮气流量，差热信号，各种开关状态,流量归零。

2、USB通讯接口，通用性强，通信可靠不中断，支持自恢复连接功能。

3、炉体结构紧凑，升降温速率任意可调。

4、改善了安装工艺，全部采用机械固定方式，避免炉体内部胶体对差热信号的污染。

5、双温度探头，保证样品温度测量的高度重复性。一路温度探头安装在炉壁上，用于PID控制整个炉体的温度，但由于温度的热惯性，传导到样品上的温度有一定偏差，而且春夏秋冬偏差程度不一样，因此，采用单温度探头控温与测温，无论是差热信号还是温度信号，误差都比较大；本仪器在样品底部多安装了一个温度探头，用于测量样品真实的温度，并且采用了我们专用控温技术，控制炉壁温度使样品温度达到设定温度。

6、数字气体质量流量计自动切换两路气氛流量，切换速度快，稳定时间短。

7、标配标准样品，方便客户校正恒温系数。

8、软件自适应各分辨率电脑屏幕，软件自动根据电脑屏幕大小调节各曲线显示方式。支持笔记本，台式机；支持Win2000,XP,VISTA,WIN7等操作系统

9、支持用户自编程程序，实现测量步骤全自动化。软件提供数十种指令，用户可根据自己的测量步骤，灵活组合各指令，并保存。复杂的操作就简化成一键操作。

2. Features

1. Industrial-grade wide-screen touch structure, rich display information, including set temperature, sample temperature, oxygen flow, nitrogen flow, differential heat signal, various switch states, and flow return to zero.

2, USB communication interface, strong versatility, reliable and uninterrupted communication, and supports self-recovery connection function.

3. The furnace body has a compact structure, and the temperature rise and fall rate can be adjusted arbitrarily.

4. The installation process is improved, and all mechanical fixing methods are adopted to completely avoid the pollution of the differential thermal signal by the colloid inside the furnace body.

5. Double temperature probes ensure high repeatability of sample temperature measurement. A temperature probe is installed on the furnace wall to use PID to control the temperature of the entire furnace body. However, due to the thermal inertia of the temperature, the temperature transmitted to the sample has a certain deviation, and the deviation degree is different in spring, summer, autumn and winter. Therefore, a single temperature is used. Probe temperature control and temperature measurement, whether it is a differential thermal signal or a temperature signal, the error is relatively large; this instrument installs a temperature probe at the bottom of the sample to measure the true temperature of the sample, and uses our special temperature control technology. Control the furnace wall temperature so that the sample temperature reaches the set temperature.

6. The digital gas mass flow meter automatically switches the two-channel atmosphere flow, with fast switching speed and short stabilization time.

7. Standard samples are provided as standard, which is convenient for customers to calibrate the constant temperature coefficient.

8. The software adapts to the computer screen of each resolution, and the software automatically adjusts the display mode of each curve according to the size of the computer screen. Support notebook, desktop computer; support Win2000, XP, VISTA, WIN7 and other operating systems

9. Support user self-programming program to realize full automation of measurement steps. The software provides dozens of instructions, and users can flexibly combine and save the instructions according to their own measurement steps. Complex operations are simplified into one-key operations.

三、技术参数：

1:温度范围: 室温~500℃

2:温度分辨率: 0.01℃

3:升温速率: 0.1～80℃/min

4:控温方式：升温，恒温（全自动程序控制）

5:DSC量程: 0～±500mW

6:DSC解析度: 0.001mW

7:DSC灵敏度: 0.001mW

8:工作电源: AC 220V 50Hz或定制

9：气氛控制气体：氮气 氧气（仪器自动切换）

10：气体流量：0-200mL/min

11:气体压力：0.2MPa

12:气体流量精度：0.2mL/min

13:选配坩埚：铝质坩埚Φ6.6*3mm

14:参数标准: 配有标准物质（铟，锡，锌），用户可自行校正温度和热焓

15:数据接口：标准USB接口

16:显示方式: 24bit色，7寸LCD触摸屏显示

17:输出方式：计算机和打印机

18:重量23KG

19:外形尺寸：长45cm*宽30cm*高27cm

Three, technical parameters

1: Temperature range: room temperature~500℃

2: Temperature resolution: 0.01℃

3: Heating rate: 0.1～80℃/min

4: Temperature control method: heating, constant temperature (automatic program control)

5: DSC range: 0～±500mW

6: DSC resolution: 0.001mW

7: DSC sensitivity: 0.001mW

8: Working power supply: AC 220V 50Hz or customized

9: Atmosphere control gas: nitrogen and oxygen (the instrument automatically switches)

10: Gas flow rate: 0-200mL/min

11: Gas pressure: 0.2MPa

12: Gas flow accuracy: 0.2mL/min

13: Optional crucible: aluminum crucible Φ6.6*3mm

14: Parameter standard: Equipped with standard materials (indium, tin, zinc), users can calibrate the temperature and enthalpy by themselves

15: Data interface: standard USB interface

16: Display mode: 24bit color, 7-inch LCD touch screen display

17: Output method: computer and printer

18: Weight 23KG

19: Dimensions: length 45cm*width 30cm*height 27cm