Introduction to temperature and humidity sensors

User:JXCTUpload time:Jul 25 2022
What is a temperature and humidity sensor?

A temperature and humidity sensor is a device that converts temperature and humidity into electrical signals that can be easily measured. Temperature and humidity sensors on the market generally measure temperature and relative humidity.

Temperature and humidity detector
Temperature and humidity detector
How does the T/H sensor work?

Temperature and humidity sensors mostly adopt temperature and humidity integrated probe as temperature measuring component, collect temperature and humidity signal, through circuit processing, converted into current signal or voltage signal linear relationship with temperature and humidity. Can also directly through the master chip 485 or 232 interface output.

How do I calibrate a T/H sensor?

The T/H sensor (SHT30 series) is calibrated before delivery and can be used directly after receiving it. The second calibration is of little significance. If you need to calibrate, you can find a temperature and humidity with the same measurement range and accurate value. Compare devices. Adjust values by manually pressing buttons or modifying communication protocol parameters.

How to choose the best t/H sensor?

The selection of temperature and humidity sensor is based on the measurement accuracy, which is the most important indicator of humidity sensor. Each percentage point increase is a step, or even the last level, for humidity sensors. Because to achieve different precision, manufacturing costs vary greatly, and so do prices. Therefore, users must choose according to their own needs, should not blindly pursue “high, fine, fine”. If the humidity sensor is used at different temperatures, the display value should also consider the influence of temperature drift.

As we all know, relative humidity is a function of temperature, and temperature seriously affects the relative humidity of a given space. Temperature change 0.1°C. A humidity change of 0.5% RH will occur (error). If it is difficult to achieve constant temperature in application, it is not appropriate to put forward the high precision of humidity measurement. In most cases, accuracy of ±5%RH is sufficient if there is no accurate temperature control method or the space under test is not sealed.

For the local space where constant temperature and humidity need to be accurately controlled or the occasion where humidity changes need to be tracked at any time, the humidity sensor with accuracy above ±3%RH should be selected. Accuracy requirements are higher than ±2%RH, and it can be difficult to calibrate the sensor even with a standard humidity generator, let alone the sensor itself.

The relative humidity meter, even at 20-25℃, is difficult to achieve the accuracy of 2%RH. Typically, the characteristics given in the product information are measured at room temperature (20 ° C ±10 ° C) with clean gas.

Temperature and humidity sensor
Temperature and humidity sensor
JXCT Temperature and humidity sensor

The temperature and humidity detector adopts a high degree of protection enclosure, and the degree of protection is IP65. It can be used in outdoor or high dust occasions. High sensitivity, accurate measurement, no fear of condensation, strong anti-interference, stable performance.IP67 high-density material shell, built-in waterproof strip, moisture-proof and dust-proof. It can be used in harsh environments such as high temperature and humidity, dust, rain and snow. -40℃-80℃ can be customized.The temperature and humidity sensor products use high-sensitivity temperature-sensing elements, the sensor has high measurement accuracy and strong anti-interference ability.Temperature and humidity sensors can be used for temperature and humidity detection in harsh environments such as industrial plants, traffic tunnels, energy, and electricity, as well as temperature and humidity detection in computer rooms and laboratories such as fruit trees, gardens, agricultural pastures, agricultural greenhouses, and flower breeding.