Industrial temperature transmitters are devices used to measure temperature in industrial processes. They convert temperature signals into standard industrial output signals, such as current signals (4-20mA), voltage signals (0-10V), or digital signals, facilitating monitoring, control, and recording of temperature changes. Here is a detailed overview of the technology and applications of industrial temperature transmitters:

Technology Aspect:

1. Sensor Types:

   • Resistance Temperature Detectors (RTD): Utilize the principle of resistance variation with temperature, commonly made of materials like platinum, nickel, and copper.
   • Thermocouples: Measure temperature by exploiting the difference in thermal electromotive force between different metals, with common types including K-type, J-type, and T-type.
   • Semiconductor Temperature Sensors: Measure temperature based on the resistance-temperature characteristics of semiconductor materials such as silicon and zinc sulfide sensors.

2. Measurement Principles:

   • Resistance Change: Determine temperature by measuring the variation in sensor resistance.
   • Thermoelectric Measurement: Measure temperature by the small voltage changes generated by thermocouples.
   • Semiconductor Characteristics: Measure temperature based on the resistance-temperature characteristics of semiconductor materials.

3. Output Signal Types:

   • Analog Signals: Typically 4-20mA or 0-10V current or voltage signals.
   • Digital Signals: Often digital serial output using protocols like RS-485, Modbus, etc.

4. Accuracy and Stability:

   • Accuracy is usually described in terms of temperature range and percentage error, such as ±0.1°C or ±0.5%FS.
   • Stability indicates how stable the output signal of the transmitter is over long-term usage.

5. Environmental Adaptability:

   • Transmitters should possess certain waterproof, dustproof, and shock-resistant properties to adapt to the needs of various industrial environments.

Application Aspect:

1. Industrial Process Control:

   • Used in industries such as chemical, pharmaceutical, and food processing to monitor and control temperature changes in various industrial processes, ensuring product quality and production efficiency.

2. Temperature Recording and Alarm:

   • Coupled with data recording systems to achieve long-term storage and analysis of temperature data, while also setting up alarm functions to promptly respond to abnormal conditions.

3. Energy Management:

   • Optimize the operation of heating and cooling systems, improve energy utilization efficiency, and reduce energy consumption costs.

4. Safety Monitoring:

   • Monitor equipment and environmental temperature to ensure safe operation of equipment and employee health.

5. Environmental Monitoring:

   • Monitor temperature in places like greenhouses and warehouses to maintain suitable environmental conditions.

Industrial temperature transmitters play a crucial role in industrial automation and process control, helping enterprises improve production efficiency, ensure product quality, and maintain a safe and stable working environment.