EC / TDS
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8. EC / TDS
8.1. PREPARATION
Pour small quantities of conductivity calibration solution into clean beakers. To minimize
cross-contamination, use two beakers: one for rinsing the probe and the other for
calibration.
Note: When the meter is switched on, it will start measuring with the previously
selected range (conductivity, TDS or salinity).
8.2. CALIBRATION
General Guidelines
For better accuracy frequent calibration is recommended. The probe should be calibrated:
y
Whenever is replaced
y
After testing aggressive samples
y
When high accuracy is required
y
If “NO CAL” is displayed on the third LCD line
y
At least once a week
Before performing a calibration:
y
Inspect the probe for debris or blockages.
y
Always use an EC calibration standard that is close to the sample. Selectable
calibration points are 0.00 µS for offset and 84 µS/cm, 1413 µS/cm, 5.00 mS/cm,
12.88 mS/cm, 80.0 mS/cm, 111.8 mS/cm for slope.
To enter EC calibration:
1. Use the
keys to elect the EC range and press CAL/EDIT.
When the reading is stable and close to the selected calibration standard, STD and
ACCEPT tags are displayed blinking.
2. Press GLP/ACCEPT key to confirm calibration. The instrument displays “SAVING”,
stores calibration values and returns to measurement mode.