Conductivity Measurements; Probe Maintenance; Troubleshooting - YSI EC300 Manual De Operaciones

CONDUCTIVITY MEASUREMENTS

1. Turn the unit on. Place the probe in the solution to be measured. Completely submerge the
probe. Shake the probe lightly to remove any trapped air bubbles in the conductivity cell.
2. Press MODE to enter the desired measurement mode. The message 'rAng' (range) may
appear briefly on the display indicate auto-ranging; this is normal. Allow temperature to
stabilize before taking measurements.

PROBE MAINTENANCE

The most important requirement for accurate and reproducible conductivity measurements is a
clean cell. A dirty cell changes the conductivity of a solution through contamination. Clean the
cell thoroughly before storing it. To clean the conductivity cell:
1. Dip the cell in cleaning solution and agitate for two
to three minutes. Any foaming acid tile cleaner, such
as Dow Chemical Bathroom Cleaner, should clean
adequately. For a stronger cleaner, use a solution of
1:1 isopropyl alcohol and 1 N HCl. Remove the cell
from the cleaning solution.
2. Use the nylon brush (supplied) to dislodge any
contaminants from inside the electrode chamber.
3. Repeat steps one and two until the cell is completely clean. Rinse the cell thoroughly in
deionized, or clean tap water.

TROUBLESHOOTING

MAIN DISPLAY
OvEr
OvEr/Undr during calibration
MAIN SECONDARY
DISPLAY DISPLAY
OvEr/Undr
• Conductivity is >200.0 mS
• Salinity is > 70.00 ppt
Cell Constant Calibration is
Temperature >90.0 °C
OvEr
Temperature < -10.0 °C
Undr
PROBLEM
out of range
6
POSSIBLE SOLUTION
• Completely submerge the
probe.
• Allow sufficient time for the
electrode and Temp probe
stabilization.
• Recalibrate with correct value
for the conductivity standard.
• Replace conductivity standard.
• Clean cell.
• Return for service.
• Decrease/Increase the sample
temperature.
• Return for service.