Course: BFM 203 Water Treatment and Control

Lecture

(6/13)

Signal Transmission

Data may be transferred using a variety of methods. Mechanical methods are the most basic and include pressure gauges, indicators (position/level), and switches. Hydraulic systems use liquid pressure to transmit signals, and pneumatic systems use air pressure/vacuum. Electronic systems are the most common today and include data logging, recording, indication, alarming, and control signals. Electrical signals are commonly used for signal, telemetry, and control functions and include ON/OFF control, time impulse control, and pulse rate control. Multiple types of signal transmission may be used in conjunction with each other. Verify accuracy of each by comparing remote signal outputs with local indications.