EC / TDS 23
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: At power on the meter starts measuring with the
previously selected range (conductivity, TDS or salinity).
Note: A new EC calibration automatically clears the %NaCl
calibration . "NO CAL" message is displayed blinking.
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.
