The Pioneer of Modern Leak Testing

Laminar Flow Leak Test

What is a Laminar Flow Leak Test?

The Laminar Flow leak test is a sensitive flow technique that is commonly used on large volumes where the leak integrity specification is high, for example exhaust assemblies and sub-assemblies. This method uses a calibrated flow element that relies on the laminar flow across two ports and compares the pressure difference between these ports which is proportional to flow rate.

How is a Laminar Flow test performed?

First, the fill valve is opened to allow flow across the laminar flow element and through the test part. Once the desired pressure is achieved, the measure phase is entered. Any flow through the flow element will register as a pressure difference. A large flow will register as a large difference in pressure between the ports which is proportional to the flow rate. A restricted flow through the part will increase back pressure which will indicate a lower pressure difference, hence a lower flow.

Laminar Flow Test Pneumatic Diagram
Laminar Flow Test Pneumatic Diagram

What Uson Testers can perform an Laminar Flow test?

Optima vT – A versatile and customizable leak tester with up to two channels and eight sensor inputs that supports pressure decay, differential pressure, mass flow and other common tests.

Contact Us


Uson L.P. - Corporate

8640 N. Eldridge Parkway
Houston, TX 77041 USA

Tel: +1-281-671-2000
Fax: +1-281-671-2001


Uson UK – Europe

Western Way
Bury St. Edmunds
Suffolk, IP33 3SP United Kingdom

Tel: +44-1284-760606
Fax: +44-1284-763049


Uson – China

Room 601, 567 Lan Gao Road
Shanghai, 200333, China

Main: 021-583 65859, 021-583 59187
Fax: 021-583 59185, 021-337 73559