The colorimeter is a vital instrument in school science, offering a first-hand method to explore how light interacts with solutions. In biology and chemistry, it plays a crucial role in quantifying concentrations, by measuring light absorbance or scatter—supporting key experiments from enzyme activity rates, chemical kinetics through to quality assessments.
How Does a Colorimeter Work?
A colorimeter operates on the principle that substances absorb specific wavelengths of light. The Data Harvest Wireless Colorimeter uses built-in LEDs to probe a sample held in a cuvette; the amount of light that passes through is then reported as a numerical value. This is an application of the Beer-Lambert Law, making it ideal for quantitative analysis. With built-in LEDs of 470 nm, 520 nm, 573 nm, and 625 nm and 660 nm, the sensor allows for flexible analysis of different substances based on their optimal absorbance.
Additionally, this sensor supports turbidity measurement at 850 nm. Light is attenuated according to the concentration of suspended particles present – ideal for water purity studies and for introducing industrial processes.
Common Classroom Applications
Enzyme activity: monitor the breakdown of starch by amylase or the effect of temperature and pH on catalytic activity
Water testing: use turbidity to monitor contaminants
Reaction kinetics: track the change in concentration as a reaction proceed.
Thanks to its wireless design, compatibility with Data Harvest’s EasySense software and apps, data can be recorded and analysed on tablets, Chromebooks, or PCs—ideal for collaborative work in modern classrooms.
Troubleshooting and Tips for Best Results
Before use, always “zero” the sensor using a blank cuvette (typically water or a control solution). Inconsistent calibration can result from residual solutions or fingerprints that interfere with the light path.
2. Handle Cuvettes with Care
Use clean, dry cuvettes, and manage them at the “frosted sides” to prevent fingerprints on the clear windows. Cloudy or scratched cuvettes can affect the readings.
3. Choose the Right Wavelength
Different substances absorb light at different wavelengths. Use a wavelength that does not correspond to the colour complement of the solution evaluated: for example, use 625 nm to measure green solutions (circa 530 nm).
4. Mix Thoroughly
Ensure your solutions are well mixed before placing them in the colorimeter. Settling or uneven concentration can produce erratic readings.
Maintenance and Classroom Durability
The Data Harvest colorimeter is built with educational applications in mind. Its robust casing, rechargeable battery, and wireless connectivity ensure it is suited to repeated daily use in a busy lab or in the field. After each session, clean the cuvettes and wipe the sensor’s cuvette chamber to prevent build-up of residues. Store it in a dry environment and recharge regularly to maintain performance.
The Data Harvest Wireless Colorimeter Sensor is an indispensable tool for secondary science. With proper setup and care, it delivers reliable, curriculum-aligned results that enhance student understanding of key scientific principles—making it an excellent addition to any science department.
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This article was written by the team at Data Harvest. Data Harvest is a UK-based company that produces educational science data logging products. They provide solutions for schools and universities in STEM education.
View Data Harvest's full product range here.