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Our Mission
The mission of Sierra Instruments Emissions Systems group is to be your engine particulate emissions specialist.  We drive all parts of our business to be the leading manufacturer of BG-3 partial flow sampling technology in the world in terms of quality, delivery, price, innovation, and customer support.


Core Product & Services
We manufacture engine emissions testing products that give our customers the ability to develop and certify cleaner engines faster and more efficiently. Our Model BG-3, which is protected by nine patents with several pending and is our flagship product.  To complement the BG-3, our filter and air handling, flow measurement and test cell automation solutions offer the customer a single focused choice for all particulate measurement needs.


Local Service & Lifetime Support
By combining superior product quality with a talented global support network of experts in over 150 locations in over 50 countries, Sierra consistently delivers quality measurement solutions for each customer and supports customers for the life of the product.


Background
In 1991, Caterpillar Inc. and Sierra Instruments formed a joint agreement to commercialize several Caterpillar patents to produce the Model BG-1 Partial Flow Sampling System (PFSS). Sierra followed this effort up with the Model BG-2 PFSS which features advanced software.  

Our BG-3 technology was developed in 2003 in response to pending requirements for transient cycle development and certification of non-road engines.  The flagship Sierra Model BG-3 transient PFSS is protected by nine patents with several pending.  Due to their expanded power output levels, higher mass flow rates and elevated test cycle exhaust heat content, off-road engines present a unique set of challenges to the continued use of CVS systems.  Further, a need was expressed by after treatment and engine development personnel for a transient particulate sampling system deployable upstream and downstream of after treatment systems for concurrent particulate sampling to enable particle removal device efficiency studies. Read More…