For industrial enterprises, universities, research laboratories and various other items in a vacuum drying under conditions of thermal treatment. In the vacuum drying of articles for heating has the following advantages: 
 1. Can reduce the drying temperature (low pressure, low temperature) 
 2. Avoid some of the items oxidation heat, no dust destruction 
 3. To avoid heating the air to kill living cells 

 II. Technical Specifications 
 1, temperature range: RT +10 ℃ ~ 250 ℃ 
 2, the temperature fluctuation degree: ≤ ± 1 ℃ 
 3, pressure range: ambient pressure ~ 133Pa (1Torr) 
 4, Studio Size (mm): 450 × 450 × 450 
 5 Dimensions (mm): 610 × 592 × 1260 
 6, supply voltage: AV220V 50HZ 
 7, power: 2.5KW 

 III. Structure and working principle 
 DP90 for the vertical structure of the vacuum drying oven, vacuum box by the box, vacuum system, temperature control system consists of three parts. 
 High-quality cold-rolled steel shell box made of sprayed surface. Semi-circular shape of interior angles of a square made of stainless steel liner. Between inside and outside the box filled with ultra-fine glass wool for insulation materials, double doors with bulletproof glass observation window for easy observation of the test product. The other also has a long cylindrical door with tempered glass inner door button, buckle and adjust the door within the door of the pitch, so that after closing the door rubber seal can be pressed to ensure that the vacuum does not leak. (Note: The rubber ring is not oil!) 
 Vacuum system by a vacuum pump, vacuum gauge, solenoid valve, release valve and other components. 
 Temperature control system consists of sensors, temperature control instrument, heater components, when the temperature control output resistance of the sensor signal is received after the work in the PV display the actual temperature of the indoor measurements, when the input signal is less than the set value, the thyristor conduction pass, so that the heater get enough electrical power to generate heat. On the contrary, no SCR output, the heater is not heating. PID temperature controller with adjustable temperature measurement error correction, timing control function and a light and automatic over-temperature deviation alarm off. 
 DP90 diaphragm temperature control by two temperature controller.