A telemetry system consists of a remote site and a control site. The remote site wireless telemetry device contains systems and processes whose parameters are to be monitored. It would ideally consist of instruments that measure flow, pressure, temperature, etc. of a process. A wireless telemetry device at a control site is equipped with monitoring systems, which supervise conditions of power failure, water level, battery voltage, intrusion, etc. Chart recorders, alarm control panels, and data loggers are used for this supervision.
Operation of a telemetry system
When a telemetry device at the remote site detects any abrupt behavior in the digital/analog inputs, it triggers a signal. This signal is carried to the control site. The control site telemetry device then decides the action to be taken depending on the received signal. It then sends a signal back to the remote site with necessary control actions. The communication between the control site and the remote site is, many times, done by wireless medium.
Wireless telemetry systems were implemented to eliminate the use of dedicated wires and circuits to transfer data between a remote site and a control site. A radio system operating on RF (radio frequency) provides single point and/or multi-point communication. This is often called RF telemetry.
Advancements and massive developments in wireless technology have scaled up the performance of RF telemetry systems. Wireless telemetry provides a cost-effective way to monitor remote sites without any delay or risk of broken circuits. Also, changing a wired system to a wireless system is done at minimal cost.
Applications of Wireless Telemetry
Wireless Telemetry is used in almost every activity of process engineering, chemical plants, irrigation projects, military, etc.
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