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Control and Instrumentation Glossary

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Unit Control Panel
A control panel associated with a single unit of equipment, e.g. compressor control panel.
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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.
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UL - Underwriters Laboratories
North American based independent not-for-profit product-safety testing and certification organisation.

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Flexible cables carrying electrical and instrument wiring; hydraulic tubing and chemical tubing.

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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


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


US Gallons Per Day

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