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		Control and Instrumentation Glossary Search for another term in our Glossary        UCP Unit Control Panel A control panel associated with a single unit of equipment, e.g. compressor control panel. Further Reading   UFL Upper Flamability Limit Above the UFL a mixture of substance and air lacks sufficient air to burn. Further Reading   UFL - Upper Flammable Limit The concentration of flammable gas in air at atmospheric pressure above which combustion will not occur. The figure is expressed as a percentage by volume. Further Reading   UL - Underwriters Laboratories North American based independent not-for-profit product-safety testing and certification organisation. Further Reading   Umbilical Flexible cables carrying electrical and instrument wiring; hydraulic tubing and chemical tubing. Further Reading   UPS Uninterruptible Power Supply A UPS sits between a power source and a device (e.g. a computer) to prevent undesired features of the power source (outages; surges etc.) adversely affecting the performance of the device. Further Reading   USB Universal Serial Bus An external bus standard for connecting as many as 127 peripheral devices to computers with data transfer rates up to 12 Mbps. Further Reading   USGPD US Gallons Per Day Further Reading		Sponsored Links
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