Geodesic Sensor Net Technical Manual page 55

Do not apply the GSN to subjects/patients who have:
• lice
• corn rows
• dreadlocks
• nonpermanent hair dye
This section provides only general guidelines. Specific screening criteria may vary,
depending on the laboratory or clinic.
Electrolyte Formulations
The Geodesic Sensor Net uses mild electrolyte formulations for electrode application.
These formulations include the HydroCel Saline (potassium chloride based) and the
HydroCel HS (hydrogel). The HydroCel Saline and HS are in powder form and must
be mixed with water.
The following tips will help ensure that the electrolyte formulations do not adversely
affect the condition of your GSN:
• With the HydroCel Saline and HydroCel HS, use warm, distilled water.
• With the HydroCel Saline and HydroCel HS, mix the solution only in the
designated "electrolyte formulation" plastic bucket from the Net Support Kit.
• With the HydroCel Saline, put the powder in the bucket first , before adding
water.
• With the HydroCel HS, put the water in the bucket first, then slowly add the
powder stirring constantly. If lumps develop, press them against the side of the
bucket to break them up. If necessary, allow the solution to sit for one hour to
hydrate properly. Do not allow it to sit for too long (for example, several hours),
or the solution will become runny. If this happens, you will need to mix up a
fresh match of HydroCel HS solution.
• See "Preparing the Electrolyte Formulation" on page 58 for full details about
each HydroCel formulation.
Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007
5: Service and Maintenance
55