In laboratory testing, a calorimeter is a key device for accurately measuring the calorific value of a substance, but many users often encounter the problem that the calorimeter cannot ignite, which not only affects the detection efficiency, but also may delay the experimental process. Below, we will analyze in detail the common reasons and solutions for the calorimeter to fail to ignite.

Ignition failure

The ignition device is the core component of the calorimeter to achieve ignition. Once it fails, it will inevitably lead to ignition failure. Common ignition device problems include broken fire wires and improper spacing of the ignition electrodes. The ignition wire is easily broken due to high temperature oxidation and mechanical wear and tear, and cannot form an effective current path, so it is naturally impossible to ignite the sample. At this time, it is necessary to carefully check the status of the ignition wire and replace the broken ignition wire in time. If the ignition electrode spacing is too large, the generated electric spark energy is insufficient, and it is difficult to ignite the sample; if the spacing is too small, it is easy to cause a short circuit. The ignition electrode spacing should be accurately adjusted according to the instrument manual to ensure that the electric spark is stable and powerful

Sample problem

The characteristics and handling methods of the sample itself will also affect the ignition effect. If the water content of the sample is too high, during the ignition process, a large amount of water will evaporate and absorb a large amount of heat, making it difficult for the sample temperature to reach the ignition point, resulting in ignition failure. Therefore, before testing, it is necessary to fully dry the sample and strictly control the water content of the sample. In addition, insufficient or uneven filling of the sample will also increase the difficulty of ignition. If the filling amount is too small, the heat released by combustion is limited, and it is difficult to maintain continuous combustion; if the filling is uneven, it will lead to insufficient local combustion and affect the success rate of ignition. Samples should be filled evenly according to the specified loading amount and method.

Oxygen supply problem

The ignition of the calorimeter cannot be separated from sufficient oxygen support. Insufficient pressure of the oxygen cylinder will lead to insufficient oxygen supply, the sample cannot be fully burned, and the ignition will naturally be difficult to succeed. It is necessary to regularly check the pressure of the oxygen cylinder and replace the oxygen cylinder with insufficient pressure in time. At the same time, the blockage and leakage of the oxygen pipeline will also affect the normal transportation of oxygen. It is necessary to carefully check the oxygen pipeline, clean the blockage, and repair the leakage point to ensure a stable and smooth oxygen supply.

Abnormal other parts of the instrument

In addition to the above key factors, abnormalities in other components of the instrument may also cause ignition failures. For example, the control system of the instrument malfunctions, which may cause the ignition command to not be issued normally; the sensor malfunctions, which cannot accurately feedback the ignition status, affecting the automatic adjustment of the instrument. In such cases, it is necessary to contact a professional maintenance personnel to conduct a comprehensive overhaul and maintenance of the instrument to ensure the normal operation of each component.

There are various reasons why the calorimeter cannot ignite. When investigating, it is necessary to start with the ignition device, sample, oxygen supply and other parts of the instrument one by one. Mastering this knowledge can quickly locate and solve the ignition problem of the calorimeter and ensure the smooth development of the testing work.