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UL Listed vs Recognized. Which approval do you need for your application?

Brooks Instrument knows a lot about agency approvals.  If you need a mass flow controller, mass flow meter, or pressure controller for a hose down or hazardous area requirement you came to the right place!  We not only have the approvals, but we can also help you understand which approval is right for your application.  For example, what's the difference between UL 'Listed' and UL 'Recognized' and which one is right for my application? Well the UL Listed products carry the following mark. This means that the product has been tested by UL to nationally recognized Safety Standards and has been found to be free from reasonably foreseeable risk of fire, electric shock and related hazards in a Division 2 / Zone 2 environment.  The Brooks SLAMF Series thermal mass flow meter/mass flow controller and pressure controllers, and the Quantim IP65 Coriolis mass flow meter/mass flow controller products are all UL listed. UL Recognized products carry the following mark       The UL Recognized Component Mark means that the product has been tested as a component.  These components will later be used in complete end-products or systems.  Some additional installation precautions may be required.  For example, you may need to install the component in a housing to provide protection from dust, liquids and impact and cabling may have to be installed in a cable tray or protected in such a way that it would not be damaged.  The SLA5800 Series thermal mass flow meter/mass flow controller and pressure controllers, and the Quantim IP40 mass flow meter/mass flow controllers are UL recognized. UL Listed is the more stringent of the two and is recommended if the device is installed directly in a Division 2 or Zone 2 hazardous area.  If the device is being installed in a larger system that will provide additional protection then you might consider UL Recognized.  When in doubt call Brooks Customer Service and they will help you to make the right decision regarding approval requirements. There is plenty more to talk about when it comes to approvals and registrations but I think that is enough for one day.  We can touch on ATEX approvals, International IEC standards, Canadian CRN registrations and NEMA/IP water tight ratings another time.  Stay tuned.

About The Author

Steve Kannengieszer
Director of Marketing

Steve is director of marketing, mass flow products at Brooks Instrument with responsibility for Coriolis, thermal mass flow and pressure products.

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