A needle flame tester is an instrument used to test the combustion properties of materials, and its principle is based on the principles of combustion and thermal. This article will introduce the working principle, operation method and precautions of the needle flame tester in detail.
First, how it works.
The needle flame tester is mainly composed of a burner, a test chamber, a control part and a safety protection device. Its working principle is to ignite the gas in the air to form a needle-like flame of a certain height, place the material to be measured under the flame, and judge its combustion performance by observing the burning behavior of the material in the flame.
The gas used in this instrument can be combustible gases such as methane, propane, butane, etc., or liquid fuels such as alcohol and gasoline. The burner uses electric spark ignition, which can adjust the flame height and flame temperature. The test chamber should have good thermal insulation performance and sealing to keep the temperature and pressure in the chamber stable during the test. The control part mainly realizes the automatic control of the test process, including timing, temperature monitoring, pressure monitoring and other functions. Safety protection devices include flame extinguishers, emergency exhaust devices, etc., to ensure the safety of the test process.
Second, the operation method of the needle flame tester.
1.Preparation stage.
Before operating the needle flame tester, the following preparations need to be made:
1) Check whether the test chamber is clean and dry, and whether the temperature in the test chamber meets the requirements
2) Check whether the gas ** system is normal and whether there is any leakage in the gas pipeline;
3) Check whether the control part is working normally, including timer, temperature monitor, etc.;
4) Check whether the safety protection device is in good condition, such as flame extinguisher, emergency exhaust device, etc.
2.Pilot phase.
After the preparation is completed, the needle flame test can be carried out:
1) Place the material to be tested on the sample table at the bottom of the test chamber, and pay attention to the angle and position of the material
2) Turn on the gas ** system, adjust the ratio of gas and air, so that the flame height and temperature meet the required requirements;
3) Start the timer to observe the combustion behavior of the material to be measured in the flame, including the burning time, burning distance, smoke, etc.;
4) During the test, the observation and recording data should be maintained, and the test should be stopped immediately if there is any abnormality
5) After the end of the test, close the gas ** system and control part for follow-up data processing and analysis.
3. Precautions.
When performing a needle flame test, the following things need to be noted:
1) The operator should be professionally trained and familiar with the operation process and safety specifications
2) During the test, the temperature and pressure in the test chamber should be kept stable to avoid affecting the test results
3) The material to be measured should meet the specified size and shape requirements, and the placement angle and position should be accurate
4) When observing and recording data, an objective and accurate attitude should be maintained to avoid the influence of subjective error on the test results
5) After the test, the residue on the test chamber and sample table should be cleaned up in time to keep the equipment clean and hygienic.
In short, the needle flame tester is an important instrument for testing the combustion performance of materials, and its working principle is based on the principles of combustion and thermal. When performing needle flame tests, it is necessary to pay attention to the requirements of safety specifications, operating procedures and data recording to ensure the accuracy and reliability of test results.