CLEARVIEW® DB DUAL BEAM PHOTOMETER

Description

RELIABLE VIS-NIR DUAL-BEAM PHOTOMETER

A True Dual-Beam Photometer

Our GUIDED WAVE™ ClearView® db VIS-NIR Dual-Beam Photometer is the first commercially available true dual-beam filter photometer. A primary attraction of any photometric analyzer is its low cost; however, the compromise is usually performance. We have dramatically improved photometer performance by adding our unique dual-beam optics, which provides long-term, stable operation. The flexible configurations of the ClearView db VIS-NIR Dual-Beam Photometer also meet many online analysis requirements for liquid and gas process streams.

BENEFITS

Stable dual-beam design decreases drift due to lamp aging – yielding long-term performance
Several enclosure options mean low installation costs
Six filter positions make multi-parameter analysis a possibility
Two channels for lower cost per sample point
Optional turbidity monitoring
Compatible with a wide range of flow cells and insertion probes
Low maintenance
Long life Tungsten-Halogen Lamp (>4000 hours typical)
Dual-beam performance lengthens time between required probe cleanings

WHAT IS A TRUE DUAL-BEAM PHOTOMETER?

A True Dual-Beam Photometer is an analytical instrument that uses two light beams to measure the properties of a sample. In a typical single-beam photometer, a beam of light is directed through the sample, and the amount of light that is absorbed or transmitted by the sample is measured. However, variations in the light source or detector can affect the accuracy of the measurement.

In a true dual-beam photometer, two separate beams of light are used. One beam passes through the sample, while the other passes through a reference material or a blank solution. By comparing the two beams, any variations in the light source or detector can be eliminated, resulting in more accurate and precise measurements.

This dual-beam setup also allows for continuous monitoring of the sample, as any changes in the light intensity (not due to process changes) can be immediately detected and corrected for. True dual-beam photometers are commonly used in industries such as chemical production, petrochemicals, pharmaceuticals, and environmental monitoring, where accurate and reliable measurements are critical.

PRINCIPLE OF OPERATION

Photometry is fundamentally the measurement of the intensity of light. Observable on many levels, changes in light intensity occur as a result of interactions with different materials. Further, the Beer-Lambert Law describes a useful relationship between light and matter. Matter absorbs light in measurable amounts at specific wavelengths. The degree of absorption correlates to the concentration of matter that is exposed to the light across a known optical distance, or pathlength.

COMPLETE ANALYZER SYSTEM

The GUIDED WAVE ClearView db VIS-NIR Dual-Beam Photometer is a complete analytical system comprised of three main components: 1) the photometer, 2) the fiber optic cables, and 3) the sample interface. The photometer both transmits the source light and quantifies the light that was not absorbed by the sample (see above). Optical grade fiber cables are used to carry the light from the photometer to the sample and back. Using high performance fiber cables permits the sample interface to be located up to 100 meters from the photometer.