Blank the instrument and measure a colored-water sample
7 steps
Choose the measurement mode
Power on and use Menu to select absorbance or transmittance. Record the installed LED/wavelength and the mode before measuring.
Check: Mode and LED are known and suitable for the visible sample.
Companion guide, source references and reuse license
Prepare the blank
Fill a clean cuvette with the blank liquid. Remove bubbles from the light path and wipe the clear faces without touching them again.
Check: The optical faces are clean and the blank contains no intended color signal.
Seat and cover the blank
Insert the blank consistently in the cuvette holder and fit the black light-blocking cover.
Check: Ambient light is blocked and the cuvette is fully seated.
Run blanking
Press the top-right Blank button and wait for the Blanking indication to finish. Keep the blank and cover undisturbed during this operation.
Check: Blanking completes before the sample is introduced.
Measure the sample
Replace the blank with the prepared colored-water cuvette, keeping the optical orientation consistent. Refit the cover and record the displayed value with its mode.
Check: A stable reading is recorded as absorbance or transmittance, not an assumed concentration.
Repeat the reference check
Reinsert the blank with the same orientation and cover. Compare the displayed response with the expected blank baseline and repeat if handling changed the result.
Check: The reference check is consistent with the selected measurement mode.
Clean and record the exercise
Remove and rinse the cuvettes, wipe any external spills and switch off. Record LED, mode, blank, sample preparation and repeated readings together.
Check: Results can be repeated without claiming a calibration curve that was never measured.
Project credit: IO Rodeo Inc.; Joanne Long and William Dickson. Guide reuse: CC-BY-4.0. Upstream reference. Prepared with AI assistance for a TwinWorks-managed contributor; no physical build/test is claimed.