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Wireless RTD Transmission

This project focuses on the development and feasibility assessment of a wireless temperature monitoring system using a 4-20 mA loop-powered transmitter and receiver with RTD technology. The system will allow for the wireless transmission of resistance values from an RTD inserted into pipelines for asphalt temperature readings. The solution aims to operate within a temperature range of 250-400°F and maintain a high accuracy, mimicking existing wired systems. A prototype will be built to test functionality and scalability for larger applications.

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Wireless RTD Transmission

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  1. Joel Burke Ben Miller Noah Myers • Wireless Transmitter/Receiver • Loop powered transmitter (4-20 mA) • Transmission intervals based on current in 4-20 mA loop • Wireless output (Bandwidth 902-928 MHz) rated to 1000 feet • Receiver outputs current • RTD • Resistive Thermal Device • Change in temperature causes change in output resistance (three wire) • Inserted into pipe to read asphalt temperature • Currently in place in existing facilities • Problem Statement • Determine feasibility of transmitting resistance values wirelessly from an RTD • Build a prototype to test functionality • Determine parts and processes for full scale implementation • Constraints • Wireless transmission up to 1000 feet • Operate in temperature range of 250-400 ºF • Be as accurate as wired system +/- 5º • Sample at frequency of 1 sample/min • Mimic existing wired system in functionality • Future Additions • Implement microprocessor for error checking • Design large scale system for 200 components 4-20 mA Loop Power Supply Wireless Transmitter RTD 4-20 mA RTD Transmitter Wireless RTD Transmission Radio Connection System we designed • 4-20 mA Transmitter • Receives three wire RTD input • Regulates current in the 4-20 mA loop proportional to RTD resistance • Connects in series with wireless transmitter • UIRO • Universal Input Resistance Output • Receives current from transmitter - outputs three wire resistance • 256 discrete intervals of 0.4 Ω • Useful in range of 0-400 ºF (93 - 200 Ω) Wireless Receiver UIRO Controller 15 V DC Power Supply 24 V DC Power Supply Test Results Receiver and Output Wiring Diagram Transmitter Wiring Diagram

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