Wireless Colorimeter & Turbidity Sensor • PS-3215

The Wireless Colorimeter & Turbidity Sensor simultaneously measures the absorbance and transmittance of six different wavelengths. The sensor can be used to study Beer's Law (absorbance vs. concentration), enzyme activity, photosynthesis, and the rates of chemical reactions (absorbance vs. time). After a simple calibration, students can quickly begin viewing live measurements as they materialize across the visible spectrum at 650 nm (red), 600 nm (orange), 570 nm (yellow), 550 nm (green), 500 nm (blue), and 450 nm (violet).

This sensor also functions as a high-quality turbidimeter for water quality analysis. Rather than simply measuring transmitted light, the Wireless Colorimeter and Turbidity Sensor measures light scattered at a 90 degree angle from the sample, resulting in accurate and repeatable measurements. Additionally, the internal housing for the cuvette is opaque, which limits ambient light interference to preserve accuracy.

When used with our ezSample snap vials for water quality testing,  chemical concentrations can be determined using the built-in calibration curves for Ammonia, Nitrate, Phosphate, Chlorine and Iron. Values are reported in Parts Per Million (ppm) or grams per liter (g/L).  These chemical tests follow USGS protocols for determining these ions in the field.  Select the Buying Guide tab to explore ezSample snap vials.

How It Works

Absorbance and Transmittance: Light from a broad band white LED light source passes through the solution onto a CCD array which detects the light and analyzes it. Parts of the array are covered by narrow band filters which allow 6 of the visible wavelengths (violet, blue, green, yellow, orange, and red) through to the detector. Absorbance values can be plotted as a function of concentration (Beer's Law) or graphed over time graphed for kinetics investigations.  A collimated light source directed perpendicular to the sensor can be used for turbidity.

Important Note: Solutions used within the Colorimeter should be compatible with polystyrene (cuvette material) and ABS (device housing material). Use a glass cuvette or 12mm test tube for solutions with strong organic solvents like acetone, which will damage the plastic cuvettes. 

What's Included

• 1x USB charging cable
• 10x Cuvettes and Caps (SE-8739)
• 2x Cuvette Rack (EC-3590)
• 1x 100 NTU Calibration Solution