Let's start with the conceptual difference, the sensor is a kind of detection equipment, can sense the measured information, and can sense the information, according to the law of the change into electrical signals or other required way of information output, in order to meet the requirements of information transmission, processing, storage, display, recording and control. A transmitter is a converter that converts non-standard electrical signals into standard electrical signals on a commanded basis. It can be said that the transmitter is based on the sensor, and converts the information transmitted by the sensor into a certain output signal according to the instructions, such as the 485 type temperature and humidity transmitter, analog temperature and humidity transmitter, GPRS type temperature and humidity transmitter, etc. The sensor is measured with different parameters, its working principle and application conditions are also different, so the variety and standard of the sensor are very redundant, the following introduces us to the convergence classification method of the sensor:
Distinguished from the measurement target category, such as measuring temperature, humidity, pressure, liquid level, light, ultraviolet rays, gases and other non-electric power, the corresponding sensors are called temperature sensors, humidity sensors, pressure sensors, liquid level sensors, light sensors, gas sensors, etc., this naming method facilitates users to quickly find the products they need.
According to the working detection principle, there are resistive, capacitive, inductive, piezoelectric, electromagnetic, magnetoresistive, photoelectric, piezoresistive, thermoelectric, nuclear radiation, semiconductor sensors, etc., which is convenient for sensor R&D staff to make general analysis and discussion from the principle and design. According to the distance between the sensor and the measured target, it can be divided into contact and non-contact sensors, non-contact sensors can be used to monitor the change of target values in high-risk and high-temperature environments, such as infrared temperature sensors, which can facilitate users to measure targets that are difficult to approach or move.
According to the effect mode, it can be divided into automatic and passive sensors, automatic sensors can detect the changes of exploration signals in the measured target, or by the exploration signal in the measured target to produce a certain effect and constitute a signal, the passive sensor only accepts the signal of the measured target itself, such as the infrared thermometer commonly used in the family.
In addition, it is also necessary to select and measure the scale according to the environment used by the temperature and humidity sensor, the general scale of temperature and humidity is temperature acquiescence -40 °C - +80 °C, humidity acquiescence 0% RH - 100% RH, ultra-high / low temperature is -100 - +200 °C; In practical application, it is necessary to consider the selection of products with high drift degree due to the influence of dust, oil pollution and harmful gases, so as to ensure that the products can be used for a longer time.
Measurement accuracy is the most important indicator of humidity sensor performance, the higher the accuracy of the product, the higher the price of the product, we should also consider this when selecting the product, we must adapt measures to local conditions, select the right product.
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