Temperature and humidity transmitters: accurate monitoring and stable transmission
Working Principle:
The temperature and humidity transmitter consists of a temperature sensor and a humidity sensor. The temperature sensor typically uses the principle of resistance temperature detectors (RTDs) or thermocouples. The resistance of an RTD changes with temperature, while a thermocouple generates a thermoelectric potential when the temperature changes. The temperature value is obtained by measuring these changes. The humidity sensor is mostly capacitive or resistive. The capacitance of a capacitive humidity sensor changes with ambient humidity, while the resistance of the hygroscopic material in a resistive humidity sensor changes due to the adsorption of water molecules. The humidity value is obtained by measuring these changes. The signal acquired by the sensor is converted by an internal signal processing module and output as a standard electrical signal.
Types:
Analog Output Type: Outputs standard analog signals such as 4-20mA and 0-10V, suitable for applications requiring continuous monitoring and simple control.
Digital Output Type: Outputs signals via digital interfaces such as RS485 and MODBUS, enabling stable data transmission over longer distances, suitable for complex automated control systems or remote monitoring systems.
Integrated Type: Integrates the temperature and humidity sensor and transmitter into a single device, facilitating installation and maintenance, often used in small or space-constrained applications.
Split-type: The sensor and transmitter are installed separately, suitable for locations requiring long transmission distances or special installation requirements.
Application Areas:
Environmental Monitoring: Suitable for data centers, laboratories, hospitals, museums, and other locations with strict temperature and humidity requirements, ensuring stable equipment operation and reliable experimental data.
Pharmaceutical Industry: Real-time monitoring of temperature and humidity during drug storage and transportation to ensure drug quality.
Food Processing and Warehousing: Provides temperature and humidity data support for food preservation and processing, helping companies meet food safety standards.
Industrial Production: Monitors temperature and humidity in precision manufacturing, electronic component production, etc., to ensure production stability and product quality.
HVAC Systems: Helps regulate temperature and humidity within buildings, creating a comfortable environment and improving energy efficiency.
Selection Considerations:
Measurement Range: Select an appropriate temperature and humidity measurement range based on the application to ensure measurement accuracy and reliability.
Accuracy and Response Time: For high-precision applications such as laboratories and pharmaceuticals, accuracy and response time are crucial.
Transmission Distance: In remote monitoring systems, digital output transmitters are recommended to avoid signal attenuation.
Environmental conditions: Consider the transmitter's anti-interference capability, protection level, and high temperature and corrosion resistance to adapt to various complex industrial environments.