There are 2,400 species of crickets that make a chirping sound by rubbing a scraper on one forewing along a row of “teeth” on the opposite forewing. Because crickets are cold blooded, their activity and metabolism are governed by temperature – increasing with heat, decreasing with cold. As a result,...
Articles
Basics of Energy Management Control. Are your systems enabled with these strategies?
Understanding the terms and devices used in implementing EMC strategies helps contractors provide additional valued added services as they service existing control systems and consider recommending EMCs to customers .
One Pipe or Two ? Understanding Pneumatic Systems and restrictors.
The contractor was not very happy. He had taken over a pneumatic control system that was in a very poor state. The air compressor station had not beenproperly maintained allowing oil to spread throughout the system. By purging with Pneu-Flush most of the system was now clean and functioning properly,...
Automation Control Networks: The Field Bus
As control systems evolved from centralized systems to distributed systems, the need arose to interconnect distributed input and output points over a communications network. Individual controllers were joined together via a 2 or3 wire network, usually in a “daisy chain”.These 2 or 3 wire networks, called Field Buses, are important...
How to minimize Electro-Magnetic Interference (EMI) in HVAC Control Wiring
Electromagnetic interference (EMI) is any unwanted, induced, electrical voltage and/or current that interferes with the desired ideal electrical signal of a circuit design. DEFINITION: Electromagnetic interference (EMI) is any unwanted, induced, electrical voltage and/or current that interferes with the desired ideal electrical signal of a circuit design. EMI takes on...
