Biochemical incubator range, product features, circuit principle
LNB Xinzhuang product model: SPXD-300 biochemical incubator has two-way temperature regulation system for refrigeration and heating, and temperature controllable functions. It is a scientific research institution and junior college in biology, genetic engineering, medicine, health and epidemic prevention, environmental protection, agriculture, forestry and animal husbandry. The important test equipment of laboratories, production units or department laboratories is widely used in low temperature constant temperature test, culture test and environmental test. The biochemical incubator controller circuit consists of a temperature sensor, a voltage comparator, and a control execution circuit.
Use range editing
Biochemical incubators are widely used in environmental protection, sanitation and epidemic prevention, drug testing, agricultural and livestock, aquatic products research, colleges, production departments, water body analysis and BOD determination, bacteria, mold, microbial culture, preservation, plant cultivation, breeding experiments Special thermostats.
Studio volume: 70 liters, 150 liters, 250 liters, 350 liters, 500 liters
Temperature range: 4 to 60 ° C
Temperature control accuracy: 0.1 ° C
Temperature uniformity: ≤ ± 1 ° C
Temperature fluctuation: ≤±0.5°C
Product feature editing
1 It adopts high-quality mirror stainless steel inner tank. The box body is sprayed with high-quality steel plate, four corners and half arc, easy to clean, and the spacing of the partitions inside the box is adjustable.
2 Screen LCD display, multiple sets of data on one screen, easy to understand, easy to observe and operate. The operation is simple and the temperature control accuracy is higher than the original digital meter.
3 Equipped with the most advanced fuzzy PID intelligent temperature controller in the world, with small fluctuation and timing function (0-9999min)
3 With independent temperature limit alarm system, it will automatically interrupt when the temperature exceeds the limit, ensuring safe operation of the experiment without accidents.
4 With 4 ~ 20mA standard current signal, RS485 interface can be connected to the recorder and computer, can record the change of temperature parameters.
5 unique stainless steel circulation duct, forced air circulation, uniform temperature.
6. The number of micro-computer temperature controller with timing function key, accurate and reliable temperature control;
7. Mirror stainless steel inner tank, semi-circular corners are easy to clean, and the spacing of the shelves in the box is adjustable;
8. Using a glass observation window, the observation is convenient and clear;
3 circuit principle editing
The temperature sensor circuit uses a new temperature sensor integrated circuit IC1. The voltage comparator circuit is composed of resistors R1-R7, temperature setting potentiometers RP1, R-tooth and voltage comparator integrated circuits IC2 (N1, N2). The control execution circuit is composed of transistors V1, V2, relays K1, K2, and diodes VD1, VD2, and the like. The biochemical incubator can be restructured with an old single or double door refrigerator: use the function of the refrigerator itself to cool, install heating devices (such as electric heating wire or 150W iodine tungsten lamp) and exhaust fan under the inside of the refrigerator (can make the temperature inside the box) Evenly). Potentiometer RPl is used to set the upper limit of temperature, and RP2 is used to set the lower limit of temperature. The relay K1 controls the heating device by heating the intermediate relay (shown in the circuit), and the relay KZ controls the refrigeration system of the refrigerator through the refrigeration intermediate relay (drawn at the end of the circuit). Pins 5 and 2 of IC2 are connected to the center plugs of RP1 and RP2 respectively. Pins 6 and 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 approximately equal to 0?OlV, the corresponding temperature is 1 °C. When the temperature in the biochemical incubator is within the set temperature range, the voltage at pin 2 of IC2 is higher than the voltage at pin 5, and the voltage at pin 3 and pin 6 is equal to the voltage at pin 2 (or lower than pin voltage at 2 feet). Voltage), 1 pin and 7 pin output low level, VI and V2 are cut off, relay Kl, K2 are not sucked, cooling and heating circuits are not working.
When the temperature inside the box exceeds the upper limit of the set temperature, the voltage of pin 3 and pin 6 of IC2 will be higher than the voltage of pin 2 and pin 5, and pin 1 of IC2 changes from low level to high level, so that V2 is turned on. The relay K2 is pulled in, its normally open contact is closed, and the refrigeration system works. When the temperature inside the box is lower than the lower limit of the set temperature, the voltage of pin 3 and pin 6 of IC2 is lower than the voltage of pin 2 and pin 5, and the pin 7 of IC2 changes from low level to high level, then Vl is turned on. The relay K1 is pulled in, its normally open contact is turned on, and the heating circuit works. The components and parts choose Rl-R5 to select 1/4W metal membrane resistor, the accuracy should be 1%; R6-R9 can choose 1/4W carbon membrane resistor. Both RPl and RP2 use a wire wound potentiometer with higher precision. C uses monolithic capacitors. Both VDl and VD2 use the 1N4148 silicon switching diode. Vl and V2 select S9013 or C8050 type silicon NPN transistor. ICl selects LM35DZ or LM36, TMP36 type temperature sensor integrated circuit; IC2 selects LM393 operational amplifier integrated circuit. Both Kl and K2 use a DC relay of l2V.
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