Mettler Electronics Corp.— Rev.J_09/13/17
20
4.1 A Note About Electrodes
To ensure safe operation of the Sonicator Plus 930, follow the recommendations listed
below:
1. We strongly encourage careful maintenance of the electrode system. This includes the
lead wires as well as the pads themselves. Worn cables and/or poor pads (or the
wrong sized pads) can have a significant impact upon treatment results.
2. Do not exceed the number of recommended uses listed on the instructions for V Trodes
or other reusable self–adhesive electrodes.
3. Make sure that the entire surface of the electrode is contacting the patient.
4. Do not use moist hot packs to secure electrodes.
5. To avoid skin irritation due to high current density, do not use electrodes smaller in
surface area than the 2" in diameter V Trode self-adhesive electrode (ME 2702).
6. Do not use conductive carbon electrodes with this product.
7. Whenever clinically possible, utilize the largest possible pads to reduce local increases
in current density. In situations where small pads are required, use the lowest
stimulation intensity necessary to achieve the desired clinical results.
The table below illustrates the relationship between electrode diameter and current
density. As you can see the current density increases rapidly when diameter decreases.
Diameter
inches
Surface Area
Square inches
Current Density
mA/sq in (for 10mA)
1.25 1.2 8.2
2.00 3.1 3.2
3.00 7.1 1.4
1.25 inch
diameter
2.00 inch
diameter
3.00 inch
diameter
Figure 4.2—Electrode Sizes and Current Density
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