Here's a simplified explanation of how a sending unit works:
1. Physical Property Detection: The sending unit is designed to detect a specific physical property or variable, such as temperature, pressure, flow rate, level (liquid or solid), weight, or any other measurable parameter.
2. Signal Conversion: The sending unit converts the detected physical property into an electrical signal. It achieves this conversion using suitable sensing elements or mechanisms based on the measured property. For instance, a thermocouple in a temperature sending unit generates a voltage proportional to the temperature it experiences.
3. Transmission or Amplification: The electrical signal generated by the sending unit is either amplified or transmitted directly to an appropriate receiving device, such as a transmitter, controller, meter, display unit, or data logger.
4. Data Interpretation: The electrical signal received from the sending unit is then interpreted, processed, and converted into a usable format for monitoring, display, or further control actions.
Sending units come in different forms and designs depending on the application and measured parameter. Some common examples include:
- Temperature sensors (thermocouples, resistance temperature detectors, or thermistors)
- Pressure sensors (piezoresistive, capacitive, strain gauge, or inductive)
- Flow rate sensors (mechanical, ultrasonic, or electromagnetic)
- Level sensors (capacitive, ultrasonic, float-based, or optical)
- Position sensors (linear potentiometers, rotary encoders, or LVDTs)
- Load cells (for measuring weight or force)
These sending units play a vital role in various industries such as manufacturing, energy, aerospace, automotive, agriculture, and environmental monitoring. They enable accurate and reliable sensing, measurement, and control of critical parameters in industrial processes, machinery, and equipment.
