What is the working principle and function of the air conditioning sensor?
The air conditioner sensor is also called a temperature sensor. The main function of the air conditioner is to detect the temperature of each part of the air conditioner. There are many more than one air conditioner sensors in the air conditioner, and they are distributed in various important parts of the air conditioner. The most basic air conditioning sensor configuration number is 3, in large or high-end air conditioners, the number of air conditioning sensors will increase exponentially. The following editor will introduce to you the working principle of the air-conditioning sensor, the function of the air-conditioning sensor, and the price of the air-conditioning sensor.
The working principle of air conditioning sensor
Air conditioner temperature sensor is a thermistor with negative temperature coefficient, referred to as NTC, its resistance decreases with increasing temperature, and increases with decreasing temperature. The resistance value at 25°C is the nominal value.
The temperature sensor of the air conditioner is connected in series with a resistor and divides the voltage of 5V (+3.3V used by some air conditioners), and the divided voltage is sent into the CPU. Because the air conditioner temperature sensor adopts the negative temperature coefficient thermistor, its resistance value decreases when the temperature increases, and its resistance value increases when the temperature decreases. So the CPU input voltage law is: when the temperature rises, the CPU input voltage rises, when the temperature drops, the CPU input voltage decreases accordingly. This changed voltage is analyzed and processed inside the CPU to determine the current tube temperature or room temperature, and the operating state of the air conditioner is controlled through internal programs and artificial settings.
Since the sampling voltage sent to the CPU will vary within a large range with changes in temperature, manufacturers generally take 25 degrees as the standard when designing, and design the sampling voltage to half of the power supply voltage to account for temperature changes. The voltage change hatches ample room. If the sampling voltage is designed to be too high or too low, the current temperature change will not be reflected normally. Since the resistance of each series resistance of R1, R2, and R3 is constant, if the resistance of the internal resistance circuit of the CPU interface is not considered (in fact, the internal resistance of the interface is relatively large, you can ignore it), then you must ensure that its A, The voltage of the three CPU input points of B and C is about 2.5V (under 25 degrees), and the three sensors of RT1, RT2, and RT3 can only be used in daytime and the three series resistors (R1, R2, R3) of the same resistance value. , Otherwise the voltage drop at this point deviates more.
The role of air conditioning sensor
1. Internal machine ambient temperature sensor: It mainly detects the ambient temperature in the room and controls the start and stop of the air conditioner.
2. Internal machine coil sensor: mainly detects the temperature of the internal machine tube, prevents cold wind in winter, and defrosts the external machine. (Some are the temperature defrosting of the outer machine tube)
In summer, the internal machine is protected against freezing.
There are usually three basic probes:
One is a temperature control probe, which is located in the filter at the air inlet of the indoor unit of the air conditioner (the cabinet is outside the fan, and the hanger is fixed on the evaporator);
One is to put a cold air probe when the air conditioner is heating, on the indoor unit evaporator;
One is an automatic defrosting probe for air-conditioning heating, on the condenser of the outdoor unit.
Open the panel of the internal unit, take out the filter, and see a small black head attached to the evaporator of the internal unit. This sensor is the temperature sensor of the internal unit.
If you open the cover of the electrical box, put the temperature sensor together with the temperature sensor, and insert the temperature sensor into the internal machine evaporator tube, it is the tube temperature sensor. Different styles have different positions.
On-hook: the room temperature sensor, open the panel of the internal unit, and remove the filter to see it.
The tube temperature sensor, which is combined with the room temperature sensor, needs to open the lid of the internal machine, remove the electrical box, and insert it in the evaporator.
Cabinet machine: room temperature sensor, open the lower panel, on the side of the wind wheel.
The tube temperature sensor needs to be fully opened and inserted in the evaporator.
Air conditioning sensor price
The price of the air conditioner sensor is 0.01 yuan to 220 yuan. (Price source network, for reference only.)
What is the price of the air conditioner sensor in the market, what is the working principle of the air conditioner sensor, and what is the main function of the air conditioner sensor? These editors have given you a detailed introduction above, let’s see After finishing the above content, the basic information of the air conditioner sensor should be clear. Using the air conditioner sensor can sense the temperature of each component of the air conditioner, so as to better control the environment and give people a comfortable indoor environment.
If you want to know more, our website has product specifications air conditioning sensor, you can go to ALLICDATA ELECTRONICS LIMITED to get more information