User:Kalkao/notebook/Using the Klett Photoelectric Colorimeter
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- Turn the front knob so that the dial points to zero
- Set the power to 100
- Turn the front top knob to align the red marker with the black line
- Insert the blank
- Remember the orientation of the flask
- Switch the light path on
- Turn the knob next to the blank to re-align the red marker
- Turn the light path switch off
- Remove the blank
- Insert the sample in the same orientation as you did the blank
- Be sure to wipe the water off of the bottom of the flask
- Use a kim wipe to clean the arm of the flask. This gets rid of the condensation without scratching the glass.
- Turn the light path switch on
- Turn the front knob to realign the red marker
- Record the klett measurement
- Turn the light path switch off
- Remove the culture
- Turn the power back to 30
- Every time you insert a sample, turn the light path on, and every time you remove a sample, turn the light path off