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Ultra Low Temperature Freezer Key Design Features Microprocessor-controlled system designed for controllable range of -40C to -86C for cabinet space with 1C increment Large LED display for cabinet temperature, set temperature, ambient temperature, and input voltage Settable high temperature and low temperature alarms Automatic clean-filter alarm and sensor error alert Adjustable storage shelf height Can be connected with network, and remote alarm systems Optional temperature recorder, storage racks and storage boxes Field Proven Reliability Refrigeration system designed and manufactured with best known practice, and components with highest possible quality Reliability test performed and passed on all models including aging test on control electronics at 85C and 85% humidity environment Unique insulated inner door design for four separate storage compartments to minimize frost buildup inside the chamber Specialized control system design for a well-balanced operation of cascade refrigeration system Safety Equipped with a complete alarm system with optional remote network monitoring system UL and CE certified for application safety Malfunction alarms including high and low temperature, power outage, sensor errors, high voltage and low voltage, clean-filter, and extremely high ambient, door ajar feature standard on DW-86L486/728/828 models Capable of producing two types of alarm outputs: audible buzzer and visible flashing light Multiple built-in system protection features including user-settable protection code for controls, user settable delay to start, voltage compensation system, and protection against extreme high voltages USB port for temperature data downloading