The DM Series is known for its pipe heating system which basically resistors mounted within the refractor pipes. It is very efficient in terms of electric consumption, rigid and has a reliable build so it can last for a long time. It is also very friendly because the LED display makes it easy to learn. You can even modify the programs of the machine while it is still running. On top of that, the machines have one year warranty period. The micro switch installed will respond to the opening of the hatch. Once the hatch is opened, the power supply to the resisters is cut off. It can get the temperature while keeping it constant at the same time.