Hach Company

Robert D Stream

Ernie R Paoli

Richard J Cooper

Mark E Anderson

Richard P Kolman

Kenneth L Stutzman

Kevin A Keilbach

Ashim K Bannerjee

A system is described for verifying the calibration of a turbidimeter having a light source and a detector for scattered light. A first polarizer is positioned in the path of the light beam, and a second polarizer is positioned between the first polarizer and the detector. The first polarizer linearly polarizes the light beam and the second polarizer restricts the amount of light passing through it to reach the detector.

System for verifying the calibration of a turbidimeter

Turbidimeter

Apparatus and a method are described for eliminating gas bubbles from a moving liquid stream. The apparatus includes a plurality of chambers having an open top. Each chamber directs the moving liquid stream upwardly through an area of reduced diameter and then downwardly to an opening into an adjacent chamber. The bubbles are thereby urged upwardly to the top of the liquid where they burst and are vented to the atmosphere. The apparatus and method are especially useful, for example, in a turbidimeter.

Bubble elimination from liquid

A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.

Nephelometer instrument

Filter holder for laboratory turbidimeter

Laboratory nephelometer

Portable colorimeter

Growing community of inventors

Ft. Collins, CO, United States of America

Robert D Stream