Design of Sensors in Artificial Climate Incubator System
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The principle of humidity detection of the humidity sensor of the artificial climate incubator is that the capacitance value of the capacitive relative humidity sensor changes linearly with the change of the humidity, and the changed capacitance is converted into a corresponding change through the signal detection and conversion circuit. Voltage. The humidity sensor of this system uses a highly accurate HS11000 capacitive humidity sensor. It uses capacitive humidity sensors, which are characterized by small size, fast response time, good linearity, low temperature coefficient, high reliability and good stability. In the relative humidity range of 0% to 100%RH, when the capacitance changes from 162PF to 200PF, the error is not more than ±2%RH, and the response time is less than 5s, and the humidity coefficient is 0.04PF/oC. It can be seen that the humidity sensor is very little affected by the temperature. Temperature Sensors There are many sensors for measuring temperature. Thermocouples and RTD sensors are commonly used. A sensor made of a characteristic that changes in resistance with temperature is called a thermal resistance sensor. This system uses LT/W type temperature sensor. Constituted by platinum resistance, high precision, good stability, high reliability, in the range of 0 ~ 630.74, platinum resistance and temperature can be expressed by the following formula: 
Where R(t) is the resistance at temperature tC0; 0R is the resistance at temperature C00; A and B are constants.
The control temperature of the artificial climate incubator is between 0 and 50C0, which belongs to the effective range of the platinum resistance, so the temperature sensor can use a platinum resistance sensor. The temperature transmitter is composed of advanced circuits and connected with different temperature sensors, which can be used for different temperature measurements. The transmitter is compact, lightweight and easy to install. The sensor is characterized by: wide temperature range characteristics, input two or three lines optional, can overcome the lead resistance; output second line 4 ~ 20mA, long-distance transmission; high precision, high reliability, easy installation, strong anti-interference ability. Light intensity sensor The light intensity sensor uses the LT/G type three-wire light intensity sensor. Its main technical indicators are: 1 light intensity range: 200,000 LX; 2 output value: 4 ~ 20mA; 0 ~ 5V; 3 accuracy is ± 5000LX; 4 power supply is 12 ~ 24VDC.
The carbon dioxide concentration sensor of the artificial climate incubator, this design adopts GMW120 carbon dioxide concentration, and the performance indexes are as follows: 1 Measurement range: 0-2000ppm; 2 Accuracy at 20ppm: <±20ppm + 1.5% of reading; 3 Repeatability: <±20 %ppm; 4 Thermal drift: <2ppm/C0; 5 Measurement technique: Single beam non-divergent infrared light; 6 Sampling mode: Random sampling without direction; 7 Long term stability: <100ppm/5a; 8 Response time: <60s (10% to 90% response); 9 output signal: 4 to 20mA or 0 to 5V; 10 power supply: 24VDC/VAC (0 to 30V).