Seres OL

A Swan Company

About us 

The requirements for successful monitoring are mainly defined by two factors: the intended application and
the required parameter. At Seres OL, we conceptualize, develope and produce complete online water monitoring
devices. Optimized for best measuring results and customized for its respective end use. Always providing you with measuring results you can rely on.

Founded in the 1960s, Seres originally took root in oil and gas applications. Throughout the years, it has expanded
its offering to additional measurements and industrial fields, constantly maintaining the highest quality standards.
In 2019, Swan established the company Seres OL. As a subsidiary of the Swan group, Seres OL focuses on water
and hydrocarbon monitoring applications. Group-wide sales and customer service experts organized in worldwide
regional representatives support you with all your requests.

As an experienced supplier of measuring products for the industrial online water monitoring, Seres OL provides its
customers with modern, robust and low-maintenance analyzers and has been ISO 9001 certified since 2012.


Made in France

Lean structures characterize Seres OL. With all departments from R&D to production to quality control working close together at our headquarters in Southern France, we take care of customer requests flexibly and in a straightforward manner.

One Stop Provider

The range of products offered by Seres OL complements Swan Analytical Instruments. Together, the Swan group is your one stop shop for all online water monitoring equipment, complete sampling and sample preparation.

Reliable process data,
sturdy build

Analyzers of Seres OL pursue one goal only: deliver trustworthy data. Our robust, high performance instruments are optimized to persist in the field. Giving you correct information continuously and reflecting your actual
water properties.

Globally networked;
regionally present

As part of the Swan group, Seres OL shares a collective sales, distribution and customer service network in over 65 countries. We are your global partner with experts in every region no matter where your facilities are.