BPC instruments AMPTS III Operation And Maintenance Manual page 16

The same procedure described above can be used for AMPTS III Light.
NOTE: Make sure that the power adapter for the motor controller is disconnected from the
power supply when inserting or removing the motor cables.
From the motor it is only possible to control the direction of the mixing, clockwise (CW), AUTO
and counterclockwise (CCW). If users select AUTO, the motor controller will dictate the
change of direction at certain intervals using the timer, if the motor controller's AUTO is ON.
Since the signal cable connects the motor controller to the unit C, the phase (single or double)
and speed can be controlled using the software (see page 24).
Step 6: Prepare 3 mol/L NaOH solution. The 250 mL bottles should be filled with 200 mL of
the alkaline solution which makes it necessary to add 3.6 L and 1.8 L of 3 mol/L NaOH for 18
and 9 glass bottles, respectively. After weighing 432 g (for 18 bottles) or 216 g (for 9 bottles)
of NaOH pellets, mix it with approximately 3⁄4 of the required total volume of distilled water.
The heat generation following dissolution of NaOH in water is high, it is therefore
recommended to add small amounts of supplementary water followed by mixing. When the
NaOH is completely dissolved, add the remaining amount of water until the total volume (3.6
or 1.8 L) is reached. Prepare 0.4% Thymolphthalein by dissolving 40 mg in 9 mL ethanol
followed by 1 mL of water. Mix it with 3 mol/L NaOH solution. After adding 200 mL of 3 mol/L
NaOH solution with pH indicator in each bottle, place them on the bottle holder.
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