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BEFORE YOUR FIRST USE
A. Insert Batteries
1. Remove the battery cover
at the top of the unit.
2. Insert the set of batteries
(included) ensuring correct
polarities.
3. Securely replace battery
cover.
B. Soak the Electrode
1. Remove the electrode cap covering the VisionPlus EC331
meter.
2. Soak the electrode in distilled water for 10 minutes before
first use or after storage.
C. Preparing Standard Solutions
Suitable conductivity standards are available commercially or the
user can prepare them using research grade reagents.
Here is the 147.0uS standard solution the user can prepare to
calibrate the probe of the model EC331.
Standard solution of 147.0uS at 25
℃
: Accurately measure 100mL
of the 1413uS conductivity standard solution. Dilute with 900ml of
distilled water.
(Standard solution of 1413uS at 25
℃
: Accurately weight out
0.746 grams of research grade dried Potassium Chloride (KCL).
Dissolve in 1000ml of distilled water.)
[
Note:
You can store the remaining solution in a plastic container
for one week but the air space between the cap and the solution
must be kept to an absolute minimum. Storing the excess solution
below 4
℃
can increase the storage life. If you have any doubt of
the accuracy of the stored solution, a fresh batch should be
prepared.]
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