Product Quality Control And Inspection
After we have gone through a series of processes for manufacturing electric heating tubes, we also need to conduct final inspection of the heating tubes before shipment.
The inspection items mainly include the following inspection items,
Exterior
The external surface is intact, the bright welding is firm and the welded joint is beautiful, the U-shaped shape is well formed, symmetrical, the ceramic bead is not broken or collapsed, and it is close to the two ends of the metal shell, not loose, and the sealing silicone is uniform.
Marking
The flange of the electric heating pipe is laser marked according to customer requirements, with clear writing and clear content.
Withstand voltage test
Measure between live parts and easily touchable metal parts, 1800V setting current 5mA, 3mins without flicker and breakdown.
Input power
Measured power allowable deviation +5%, -10% (or according to customer order requirements)
Leakage current
≤0.5mA
Insulation resistance value
＞1000MΩ
Power-on test
After the electric heating tube is energized, dry it for 1-2 minutes to ensure that the heating tube heats evenly without abnormal heating.
Resistance
The measured value must meet the requirements of the drawing
Creepage distance
The distance between the lead rod of the heating tube and the tube wall should be greater than 1mm
Hydrostatictest
Under the air pressure of 1.2Mpa, there must be no water leakage or water seepage at each welding place of the heating tube, and the pressure holding time is 5 minutes
Package
To meet the transportation requirements.
The above are the items inspected by the electric heating tube before leaving the factory. Only all qualified heating tubes will be shipped to customers.
