Superior Analytical Instruments (SAI) is a sales group that brings decades of experience in measurement and control of liquids and gases to the upper mid-west region of the United States.  We specialize in measurement instrumentation, pumps and valves for water and wastewater treatment.

SAI is proud to be the midwest’s exclusive representative for the groundbreaking Sievers Product Line of Total Organic Carbon (TOC) Monitors.

  • The InnovOx line of on-line and laboratory monitors designed for the challenges of wastewater samples and capable of monitoring organics from 0.05 to 50,000 ppm TOC.
  • The M9 series Designed for continuous monitoring of waters from ultrapure to potable, the M9 On-Line combines UV/persulfate oxidation with the proven Sievers Membrane Conductometric Detection Technology for unparalleled accuracy and precision across a dynamic operating range of 0.03 parts per billion (ppb) to 50 parts per million (ppm).

SAI’s newest product line is Zwick, the world finest line of triple offset butterfly valves for steam isolation.


The number of unique technical attributes of the product, as the cone-in-cone seating design with the multiple laminations and the metal seat makes the series TRI-CON to an allrounder for many different industrial applications.

Zwick valves are used for industrial and exhaust gases, liquids, hot water or steam at lowest as well at high temperature zones up to 815°C. The TRI-CON is utilized extensively in the chemical, petro-chemical, oil & gas, offshore and district heating markets.

SAI’s standalone chemical feed system from Tacmina.

Available in 30, 50 and 120 liter sizes.

SAI can equip these systems with back pressure and anti-syphon valves per your specific application.  We specialize in sodium hypochlorite feed for disinfection and hydrogen peroxide for odor control.  These two liquids that cause most other systems to experience air binding, the Tacmina PTS with DCLPW anti gas head makes those problems a thing of the past.


SAI also offers the Van London pHoenix line of analytical sensors for pH, Conductivity, Ion Selective, Chlorine and Dissolved Oxygen measurement.  These sensors are designed for the harsh environments found in industrial processes and are available in many form factors to facilitate easy, direct replacement of your existing sensors.

We look forward to serving the upper mid-west region effectively, professionally and courteously for years to come.