Improved display for single-loop controllers

29 July 2014

Yokogawa Electric Corporation has enhanced its YS1000 series single-loop controllers with a new thin-film transistor (TFT) LCD that is said to offer improved display characteristics and a design to make maintenance easier.

Single-loop controllers are used in a wide variety of industrial facilities such as power plants, oil refineries, petrochemical plants, chemical plants, and iron and steel plants. They receive temperature, flow rate, pressure, and other types of measurement readings from sensors and send corresponding instructions to control elements such as valves in order to maintain these values within a desired range. Each control loop has its own controller. 

Today, single-loop controllers are used to control small plant facilities, serving as a backup to distributed control systems. There is increasing demand for controllers that are easy to use and maintain, due to a decline in skilled engineers on the plant floor. 

Typically, controllers are used over long periods of time and periodic replacement of the LCD screen is required. With the enhanced YS1000 controllers, the TFT LCD can be replaced while the controller remains online, without interrupting the output of signals to control elements. 

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