External humidity probe: External probe refers to the temperature and humidity sensor outside the instrument's body. The advantage of the external probe is that the measurement range will be wider than that of the built-in sensor because the humiditysensor is not together with the display and circuit parts. Suitable for measuring relatively small space, such as dry box, constant temperature, humidity box, refrigerator, etc. HENGKO HT-P and HT-E series are external humidity sensors convenient for long-distance detection and can accurately detect the local temperature of the whole environment being detected.

Built-in humidity probe: The built-in probe is invisible from the outside of the sensor, and the first appearance is naturally more generous and beautiful. Built-in probe power consumption is very low, but it also can reduce the sensor by external factors such as aging, vibration, and volatile chemical gases to ensure good stability. HT-802P and HT-802C series temperature and humidity transmitters are both built-in probe products.

Users can choose external or built-in sensors according to different usage scenarios.

We first distinguish from the concept that the sensor is a detection device that can feel the measured information and can feel the information, according to certain rules into electrical signals or other required forms of information output, to meet the requirements of information transmission, processing, storage, display, recording, and control. The transmitter is a converter; it can be ordered to convert non-standard electrical signals into standard electrical signals. It calls that transmitter is based on the sensor, the information transmitted by the sensor by the command to convert the output signal of a certain rule, such as we often hear the RS485 type temperature and humidity transmitter, GPRS type temperature and humidity transmitter, analog type temperature and humidity transmitter, etc...

Sensors and transmitters constitute the monitoring signal source for automatic control, and different physical quantities require different sensors and transmitters. Different physical quantities require different sensors and corresponding transmitters. Different types of measured parameters of sensors, their working principle, and conditions of use also vary, so the types and specifications of sensors are very complicated. The following is an introduction to the centralized classification of sensors.

From the measurement object categories to distinguish, such as temperature, humidity, pressure, liquid level, light, External violet lines, gases, and other non-electricity, the corresponding sensors are called temperature, humidity, and pressure liquid level sensors. The corresponding sensors are called temperature, humidity, pressure, liquid level, light, gas, and so on. This naming method is convenient for users to find the required products quickly. Among the many types of sensors, temperature and humidity are the most used. They must be selected according to the environment in which the temperature and humidity sensors are used. Humidity sensors must be used according to the environment to choose the measurement range. Measurement accuracy is the most important indicator of the quality of humidity sensors; the higher the accuracy of the product is sold at a higher price. The higher the accuracy of the product, the higher the price; we must also consider this point when choosing products; it must be tailored to Choose the right product.