Biochemical box product characteristics

　　1. High-quality mirror stainless steel lining, the biochemical box body is sprayed with high-quality steel plate, the four corners are semi-circular, easy to clean, and the spacing between the box partitions is adjustable.

　　2. LCD display, multiple sets of data are displayed on one screen, easy to understand, easy to observe and operate. The operation is simple, and the temperature control accuracy is higher than that of the original digital display meter.

　　3. Equipped with the world's advanced fuzzy PID intelligent temperature controller, with small fluctuation and timing function.

　　3. It has an independent temperature limit alarm system. If the temperature exceeds the limit, it will be automatically interrupted to ensure the safety of the experimental operation and no accidents.

　　4. With 4~20mA standard current signal, the RS485 interface can be connected to the recorder and computer, and can record the change of temperature parameters.

　　5. Unique stainless steel circulation air duct, forced air circulation, uniform temperature.

　　6. Digital display microcomputer temperature controller, with timing function keys, accurate and reliable temperature control;

　　7. Mirror stainless steel liner, semi-arc corners are easy to clean, and the distance between the shelves in the box is adjustable;

　　8. The glass observation window is used for convenient and clear observation.

　　Biochemical box circuit principle

　　The temperature sensor circuit of the biochemical box adopts a new type of temperature sensor integrated circuit ICl. The voltage comparator circuit is composed of resistor RL-R7, temperature setting potentiometer RPl, R and voltage comparator integrated circuit IC2 (Nl, N2). The control circuit is composed of transistors Vl, V2, relays Kl, K2 and diodes VDl, VD2, etc. The biochemical box can be transformed from an old-fashioned single-door or double-door refrigerator: use the function of the refrigerator itself for cooling, and install heater components (such as electric heating wires above 150W or electric tungsten, etc.) and exhaust fans (which can make the box uniform internal temperature). Potentiometer RPl is used to set the upper limit of temperature, and RP2 is used to set the lower limit of temperature. Relay K1 controls the heater by heating the intermediate relay (drawn in the circuit), and relay KZ controls the refrigeration system of the refrigerator by cooling the intermediate relay (drawn in the circuit later). Pin5 and pin2 of IC2 are connected to the center plugs of RP1 and RP2 respectively. Pin 6 and pin 3 of IC2 are connected to the output of ICI through resistor R3. When the voltage value of pin 2 of IC2 minus the voltage value of pin 5 is about 0.01V, the corresponding temperature is 1°C. When the temperature of the biochemical box is within the set temperature range, the voltage of IC2 is higher than 5 feet 2 feet, the voltage of 3 feet 6 feet is equal to the voltage of 2 feet (or the voltage less than 2 feet is equal to the voltage higher than 5 feet), and the voltage of 7 feet is equal Output low level 1 foot, both V1 and V2 are cut off, relays K1 and K2 are not closed, and the cooling and heating circuit does not work.