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Vernier Software & Technology
Tech Info Library

Drop Counter Troubleshooting and FAQs

Drop Counter, order code VDC-BTD, $99
Specifications and User Guide

TROUBLESHOOTING
-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, try using a narrow pencil or stylus to break the beam and see if this registers in the software.

RELATED TIL ENTRIES
TIL 1136: Do you have a drop counter?
TIL 1783: LabQuest freezes after many drops with drop counter
TIL 1462: How can I improve my results with the Drop Counter?
TIL 1800: Why doesn't my LabQuest unit recognize auto-ID sensors?
TIL 2332: Why doesn't my Drop Counter auto-id?
TIL 2673: Can I use my Drop Counter with TI calculators?

SPECIFICATIONS
-Order Code: VDC-BTD
-Detector Rise Time: less than 70 ns
-Detector Fall Time: less than 70 ns
-Power Requirements: 55 mA at 5 VDC
-Infrared Source: peak at 890 nm

CALIBRATION
-Calibrate? Not always. The sensor is set to use a default calibration of 28 drops/mL.
-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 (return to Step 7).

RELATED VERNIER PRODUCTS
Microstirrer, order code MSTIR, $9
Reagent Reservoir, 2 Valves, and Tip, order code VDC-RR, $10
Replacement cable: Digital Sensor Cable, order code MDC-BTD, $5

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