The function of desalters or desalters is that they put the fluid in a high voltage circuit with heat and under the necessary pressure in order to separate salt and salts from oil and petroleum materials in an important cycle. A voltage of about 18 kV and the necessary current, temperature 30 degrees Celsius, pressure 450 psi. The voltage is introduced to the fluid through huge networks inside a very large tank. Circuits and connections that perform these operations are important. We have made the necessary connections. The technology level of these tools is very high. Due to the high technology of these devices, we are unable to provide more technical details. In this regard, we have reached the technology of the intelligent multi-function tester machine, which has the ability to test all refinery equipment.