Drop / Bubble Counter
4
Using the Drop / Bubble Counter to count drops
Setting up the reagent reservoir and alignment adapter
The plastic reagent reservoir and tip supplied with the Counter will provide drops within the
preset calibration ranges. The reservoir has two stopcocks. One stopcock is used to set the
rate of flow from the reservoir and therefore the drop rate. The other stopcock is used to turn
the drops on and off.
Assemble the plastic reagent reservoir
Screw a stopcock fitting onto the syringe body with a gentle half turn. Fit the second
stopcock onto the first, then the tip. Turn both threaded collars to secure the fittings in
place (twist back to release).
The combination of two three-way stopcocks is used to control the flow of fluid from the
reservoir. The top stopcock is used as an adjustment valve to set the rate of flow and
therefore the drop rate from the reservoir. The lower stopcock is used in either an open
or closed position to turn the drops on and off.
The line of the blue handle indicates the ports of the stopcock that are linked and open.
Note: Leave the white sealing blank fitted to the side port of the stopcock.
Turn both stopcocks into the closed position. Clamp the reagent reservoir into place
using the alignment adapter.
Using the alignment adapter
The alignment adapter has been provided to give an easy way of aligning drops through the
infrared beam of the Counter. The adapter has three holes in its flat plate.
Adjustment valve
Drops on or off
Open - Fluid will flow when the
tap is in either of these positions
Closed - Fluid will not flow when the
tap is in either of these positions
The large hole will accept a
pH or Conductivity electrode.
The small hole marked with
‘target’ lines is for the tip of the
reagent reservoir or burette.
The other small hole is
suitable for a Temperature
sensor (if used).
