Pretreatment of Gas Analyzers with Electric Tracing Cables

When laying multiple heating cables on a straight pipe, the cables are wound back from one end of the pipe to the starting point at an angle of 315, 225, 135, or 45 degrees. Depending on the winding factor, the heating cable length is equal to the pipe length multiplied by the winding factor. Both ends of the heating cable are secured to a certain length of pipe, and the loose heating cable is then wrapped around the pipe to secure it.

If the heating cable cannot be placed underneath the pipe, it should be placed on both sides or at the top of the pipe, but the winding factor should be increased appropriately. Measure the resistance of each heating cable before placing it, and again after placing it. Wind the cable (in a 1cm circle) to ensure close contact between the electrical contact area and the pipe surface. When installing the heating cable on a pipe fitting, ensure the minimum bend radius of the heating cable. In principle, the minimum bend radius of the heating cable should be no less than five times its thickness.

The function of the sample handling system for electric heating cables is to ensure that the gas analyzer obtains a representative process sample with minimal lag time, and that the sample's condition (humidity, pressure, flow rate, cleanliness) meets the gas analyzer's required operating conditions. The successful operation of an online gas analyzer often depends not on the gas analyzer itself but on the integrity and reliability of the sampling system. This is because, no matter how sophisticated and precise a gas analyzer is, its analytical accuracy is limited by the sample's representativeness, real-time nature, and physical condition. In reality, the sampling system often encounters more problems than the gas analyzer itself, and its maintenance often exceeds that of the gas analyzer itself. Therefore, the function of the sampling system should be carefully considered, at least on the same level as the analyzer.