Practical+Vernier+Colorimeter

=Basic instructions for using Vernier Colorimeter.=


 * Equipment:**
 * Vernier colorimeter
 * (cuvettes with lids-should be in with colorimeter)
 * Go-link


 * Setting Up** (from the Vernier instruction booklet accompanying the instrument):
 * 1) Turn on your computer and open Logger Pro 3
 * 2) Plug the Colorimeter into Go-Link! and plug Go-Link! into a USB port on your computer. The software should automatically detect the probe and switch to a screen showing "Transmittance" in the lower left corner. Columns will show: Time, Trans, Abs.
 * The Colorimeter will take about 5 minutes to warm up. Keep this in mind...
 * 1) Rinse the cuvettes inside and outside to make sure they are clean. They are made of polystyrene and can scratch - please do not rub them hard with paper towels, use lens paper.
 * 2) Place your sample solutions into your cuvettes. In most cases you need a "standard" for reference so make one and identify it in your data.
 * 3) Select the wavelength: 430 nm = violet, 470 nm = blue, 565 nm = green, 635 nm = red
 * Select the wavelength closest to the recommended one.
 * If a wavelength is not recommended, consider that the color of the solution indicates the light being transmitted by the solution; other colors are being absorbed (try it!).
 * Therefore you need to select a different color than the one in the cuvette. Try each wavelength and choose the one with the highest absorbance.
 * 1) Place the standard in the Colorimeter. Give it a few seconds to "settle" then press "CAL" on the colorimeter (not the computer). This will zero the instrument to your standard.
 * 2) Take several readings using the computer. You should have 15 readings to establish a mean; minimum 7 readings.
 * Click on "data collection" in heading of Logger Pro graph
 * Change collection time to 30 seconds
 * Change collection interval to one collection every 2 seconds (15 collections in total)
 * 1) On graph, axis labels can be changed by clicking on axis labels. Popup menu give you options for axis label names. This can be done before or after data collection.
 * 2) Click "Start" in upper right hand corner to start data collection. It will stop automatically after the assinged collection period.
 * 3) Store each data collection as a unique file name (to keep track of them for later.)
 * Save them to easy to find location (like your desktop!)