Temperature and humidity sensor 4 20mA output

A temperature and humidity sensor with a 4-20mA output is a type of sensor that measures the ambient temperature and relative humidity and provides a standardized current output that corresponds to the measured values.

The 4-20mA output is a linear representation of the measured temperature and humidity. typically, a lower current (closer to 4mA) represents lower temperature or humidity values, while a higher current (closer to 20mA) represents higher values. The exact mapping of the current to the temperature and humidity values depends on the sensor's internal calibration and is often specified by the manufacturer of the sensor.

These sensors usually include a thermistor for temperature measurement and a capacitive humidity sensor. The thermistor changes its resistance with temperature, while the capacitive sensor changes its capacitance with humidity. Both sensors are mounted on a common circuit board and often housed in a weatherproof enclosure suitable for outdoor or harsh environments.

The 4-20mA output allows for easy integration with control systems and data acquisition devices, as it can be directly connected to a variety of input modules that convert the current signal to a digital value. This digital value can then be processed by a controller or a computer to display the temperature and humidity readings, log data, or control other devices based on the sensor's outputs.

4-20mA Temperature and Humidity Sensor Application Scenarios

4-20mA temperature and humidity sensor is a device used to measure the temperature and humidity in the environment, and its application scenarios are very wide, mainly including but not limited to the following aspects:

Meteorological observation: meteorological observation is an important means to study and predict weather changes, and temperature and humidity is one of the key factors affecting weather changes. Temperature and humidity sensors can monitor the temperature and humidity changes at weather stations in real time, providing accurate meteorological data for weather forecasting and climate research.

Agricultural field: In the agricultural field, farmers can reasonably arrange the planting and irrigation of crops according to the data provided by temperature and humidity sensors, so as to improve the yield and quality of crops. For example, placing temperature and humidity sensors in greenhouses can monitor and control the environmental conditions in the greenhouses to optimise the growing environment of crops.

Industrial Control: In many industrial processes, temperature and humidity control is critical. Temperature and humidity sensors can monitor the temperature and humidity in the production environment in real time, helping engineers adjust production parameters to ensure product quality and productivity. For example, in food processing, temperature and humidity sensors can monitor temperature and humidity changes in food to ensure food safety and quality.

Indoor environment monitoring: The temperature and humidity of the indoor environment have a direct impact on people's comfort and health. Temperature and humidity sensors can monitor indoor temperature and humidity to help people adjust their indoor air conditioning and ventilation systems to provide a comfortable and healthy living environment. Temperature and humidity sensors can also be used for indoor air quality monitoring, reminding people to open windows in time to avoid indoor air pollution.

Refrigerated storage and transport: in refrigerated storage and transport, in order to ensure the safety of food, vaccines and other food or products in the storage and transport process requires the use of temperature and humidity sensors on the changes in temperature and humidity for real-time monitoring to ensure its quality.

In summary, a temperature and humidity sensor with a 4-20mA output provides a reliable and standardized way to measure and monitor temperature and humidity in industrial or agriculture and commercial settings, ensuring that environmental conditions are maintained within desired ranges for optimal operation and comfort.