Features: 1. Polished stainless-steel chamber 2. Latest PID controller 3. Uniform distribution of air temperature 4. Forced-air convection 5. Double Layer glass door, larger viewing window. 6. Independent temperature-limiting alarm system ensures experiments run safely. (option) 7. RS485 connector is option which can connect computer to record the parameters and the variations of temperature. (option) 8. Provided for desiccation, torrefaction, wax-melting and sterilization in mining enterprises, laboratories and scientific research Specifictions: Model JK-DO-9030 JK-DO-9030A JK-DO-9050A JK-DO-9070 JK-DO-9070A JK-DO-9140 JK-DO-9140A Electrical Requirements 220V 50HZ Temperature Range RT+10~200â??/RT+10-250â?? Temperature Accuracy 0.1â?? Display Resolution ±1.0â?? Ambient Temperature +5~40â?? Power Consumption 850W 850W 1550W 2050W Chamber Volume 30L 50L 80L 136L Internal Dimension (WÃ?DÃ?H, mm) 340Ã?320Ã?320 420Ã?395Ã?350 450Ã?400Ã?450 550Ã?450Ã?550 External Dimension (WÃ?DÃ?H, mm) 620*530*490 700*610*630 740Ã?618Ã?630 840Ã?670Ã?730 Shelves 2(pcs) 2(pcs) 2(pcs) 2(pcs) Timing Range 1~9999min Model JK-DO-9240 JK-DO-9240A Electrical Requirements 220V 50HZ Temperature Range RT+10~200â??/RT+10-250â?? Temperature Accuracy 0.1â?? Display Resolution ±1.0â?? Ambient Temperature +5~40â?? Power Consumption 2450W Chamber Volume 220L Internal Dimension (WÃ?DÃ?H, mm) 600Ã?500Ã?750 External Dimension (WÃ?DÃ?H, mm) 880Ã?720Ã?930 Shelves 2(pcs) Timing Range 1~9999min *Remark: â??Aâ?�â??Polished stainless-steel chamber â??Without Aâ?�â??Galvanized sheet chamber Option: 1. Intelligent programmable temperature controllerLCD 2. Printer 3. Independent temperature-limiting Alarm 4. RS485 connector 5. EBM fan motor