-Primary Test: If your Drop Counter is not counting drops, check the alignment of the sensor beneath the tip of the reservoir or buret. Adjust the Reagent Reservoir so that the drop passes closer to the center of the slot.
-Secondary Test: The Drop Counter works best when the drops fall at a rate of 2 seconds per drop or slower.
-If you cannot get it to count drops, use your finger or a pen to break the beam and see if this registers in the software.
RELATED TIL ENTRIES
Do you have a drop counter?
How can I improve my results with the Drop Counter?
Why is the Drop Counter calibration lost?
I want to use my drop counter to get a graph of drops per second.
-Calibrate? Not always. The sensor is set to use a default calibration of 28 drops/mL.
Graphical Analysis, Graphical Analysis Pro, and LabQuest App (version 2.8.4 or newer) support calibration with the following instructions:
-You may manually enter a drops/mL ratio that was done from a previous calibration.
-If you choose to calibrate the sensor, you will need to perform your own drops-per-mL calibration. Follow these steps:
a. Place a 10 mL graduated cylinder below the slot of the Drop Counter.
b. Fill the reagent reservoir about 3/4 full with the titrant solution.
c. Choose to calibrate the Drop Counter in your data-collection program.
d. Open the bottom 2-way (on-off) valve to begin releasing drops through the Drop Counter.
e. Release drops until there are 9-10 mL of liquid in the graduated cylinder.
f. Close the bottom valve to stop the drops.
g. Type the exact volume, to the nearest 0.1 mL, of liquid in the graduated cylinder in the Volume (mL) box of the Calibrate drops dialog box.
h. Choose to stop the calibration routine of your program.
i. The number of drops/mL will be displayed.
j. You can now continue with the titration.
RELATED VERNIER PRODUCTS
Stir Station (STIR)
Go Direct® pH Sensor (GDX-PH)
Reagent Reservoir, 2 Valves, and Tip (VDC-RR)
Stopper Stem (PS-STEM)
Plastic 2-Way Valve (PS-2WAY)
Micro USB Cable (CB-USB-MICRO)