Follow these steps, please.
1) Use a gray DIN-BTA adapter to connect your Colorimeter to Channel 1 of your LabQuest 2.
2) Place a blank cuvette (about 3/4 full with distilled water, or the solvent of choice) in the Colorimeter and turn the control knob to 0%T.
NOTE: Allow the Colorimeter to warm up for 5 minutes.
3) Turn on the LQ2.
4) On the meter screen, tap Sensors and then tap Sensor Setup...
5) Tap the space next to CH 1 (it will say "No Sensor"). A list of sensors will appear.
6) Scroll down until you see the Colorimeter, and then tap on it to select it. Tap OK. "Colorimeter" will now appear in the space next to CH 1.
7) Tap OK. The LQ2 will now go back to the meter screen.
8) Tap Sensors and choose Calibrate: CH1: Colorimeter.
9) After the screen changes, tap Calibrate Now.
10) In the box next to "Value 1", type 0 (for 0%T). Tap Keep.
11) On the Colorimeter, turn the control knob to the desired wavelength. After the live voltage reading stabilizes (it takes a few seconds), type 100 (for 100%T). Tap Keep.
12) After the screen changes, tap OK. The LQ2 will go back to the meter screen again. The Colorimeter is ready to use.
There is no way to store this calibration, thus it needs to be done each time you use a Colorimeter.
Also, the calibration is only valid for the wavelength you selected. If you change the wavelength, you need to calibrate the Colorimeter again.
TIL 3403: Do I have an old or current Colorimeter?
TIL 1665: How do I calibrate my older Colorimeter?