The history of SOR Inc. is founded on simple ideas that work – and they work for a very long time. It all began in 1956 with the invention of the static o-ring (SOR) pressure switch. Since the ring is static, there is no friction, and no wear and tear.

Today’s SOR^® products are descendents of that original static o-ring, with minimal moving parts for unmatched quality, reliability and durability. We now manufacture nearly one hundred process instruments that are used in a variety of applications such as power generation, oil and gas, cement and water treatment.

New Low Power Switch Option for 1500 Series
SOR introduces a low power option to the 1500 Series that features contact points made from a rare metal. This metal has extremely low electrical resistance and is unyielding to corrosion. It is perfect for low power DC applications. In fact, SOR is one of the first manufacturers to make a low power switch. To learn more, please read our product bulletin.

805PT with Display is Now Available
A loop powered display can be added to the SOR 805PT pressure transmitter for the benefit of local indication.  Read the complete news release or visit the product page for more information.