The FLT93 switch provides a liquid level and flow sensor that detects and switches to help process and plant engineers comply with National Fire Protection Association (NFPA) Code 30 safety requirements in hazardous environments
The FLT93 Flow/Level Switches were designed by Fluid Components International (FCI), an electronics manufacturer, to detect overfilling conditions in tanks, issue warning alarms and provide control for liquid shut-off or diversion.
The switches also provide alert warnings whenever the dry-to-wet condition of a tank changes, including the entry of water into the tank. Airflow switches monitor ventilation air systems for air flow in fluid dispensing or handling areas to ensure their operation and warn of any system failure.
Other safety monitoring applications include gas purging of auxiliary heating systems for gas recovery, detection of low flow of heat transfer fluid in heat exchanger tubes, low fluid levels in expansion tanks and vaporisers, low-level alarms liquid knock-out pumps and low fluid flow in emergency sprinkler systems.
The company stated that the advanced line of thermal level switches and interface switches from FCI detect, monitor and alert all liquids at point levels. These level switches are designed for accurate, highly reproducible trip-point sensitivity in the water, oils, chemicals in industrial plants and processes.
Selections for the level switch output include DPDT relays or hermetically sealed relays, open collector and 4-20 mA. Alarms/trip points are field-configurable for flow, temperature, high or low hysteresis, time delay, and more, depending on the model.
The purpose of NFPA Code 30 is to prevent accidents by reducing the risks associated with the storage, handling and use of flammable and combustible liquids. Code 30 is enforceable in the US Occupational Health and Safety Administration (OSHA), many state and local regulations, as well as similar regulations around the globe.
