Vernier Drop Counter Manual

Vernier Drop Counter
(Order Code VDC-BTD)
The Vernier Drop Counter is used to perform accurate,
automatic titrations. This digital sensor can be used in
conjunction with a pH Sensor (or other sensor) to accurately
record the volume of titrant added during a titration.
The Vernier Drop Counter has many features that help simplify its use:
Adjustable clamp, fits most laboratory ring stands and lattices
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Wide drop-detecting area
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Large sensor slot, fits most conventional stick-style sensors
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Smaller, adjustable slot for temperature sensors
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Accurate drop counting at rates up to 6 drops/second
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Red LED, near the detecting area, flashes to indicate a drop has been recorded
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Note: Vernier products are designed for educational use. Our products are not
designed nor are they recommended for any industrial, medical, or commercial
process such as life support, patient diagnosis, control of a manufacturing
process, or industrial testing of any kind.
What's Included
Vernier Drop Counter

Plastic reagent reservoir
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Plastic valve with a double stopcock fitting
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Vernier microstirrer (a magnetic stirrer that fits on the tip of your sensor)
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Compatible Software and Interfaces
See
www.vernier.com/manuals/vdc-btd
compatible with the Vernier Drop Counter.
Getting Started
1. Connect the Drop Counter and additional sensor (pH Sensor, Conductivity
Probe, etc.) to the interface (LabQuest Mini, LabQuest 2, etc.).
2. Start the appropriate data-collection software (Logger Pro, LabQuest App) if
not already running, and choose New from File menu.
The software will identify the sensors and load a default data-collection setup.
You are now ready to continue your experiment.
If you are collecting data using a Chromebook™, mobile device such as iPad
Android™ tablet, or a Vernier wireless sensor or interface, please see the following
link for up-to-date connection information:
www.vernier.com/start/vdc-btd
for a list of interfaces and software
Using the Product
1. Assemble the equipment. (Note: The Vernier Stir Station, pH Sensor,
100 mL beaker, and utility clamp are not included with the
Vernier Drop Counter.)
a. Place a 100 mL beaker on the center of the Stir Station or a ring stand and
magnetic stirrer.
b. Remove the storage bottle from the sensor (if applicable). Insert the sensor
body through the larger round hole on the Vernier Drop Counter.
c. Slip the Microstirrer onto the bottom of the sensor. Slide the
Vernier Drop Counter down the ring stand to a level such that the
Microstirrer is very close to the bottom of the beaker. Tighten the turn
screw of the Drop Counter to hold it firmly in place.
d. Connect the spout and two 2-way valves to the plastic reagent reservoir.
Note: There are two 2-way valves below the reagent reservoir. In this setup,
use the bottom valve as an on-off valve (either completely open or
completely shut). Use the top valve as an adjustment valve to adjust to a
slow, consistent rate.
2. Make sure that both 2-way valves are in the closed position (horizontal). Add
about 20 mL of titrant to the plastic reagent reservoir. For this example, we
will use 0.1 M NaOH solution.
3. Before collecting data or calibrating the drops, adjust the flow rate of the two
valves of the reagent reservoir. Temporarily, place another beaker below the
spout of the reagent reservoir. First, completely open the bottom 2-way valve;
then slowly open the top valve until a very slow drop rate is achieved—a rate
of one drop every two seconds, or slower. Close the bottom valve.
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