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MW180 pH / mV / EC / TDS / NaCl / Temperature Bench Meter
10. EC / TDS
Press RANGE/
from the measurement screen and select CONDUCTIVITY.
10.1. PREPARATION
Pour sufficient conductivity calibration solution into clean beakers. Ensure that probe’s
holes are completely submersed. To minimize cross-contamination, use two beakers: one
for rinsing the probe and the other for calibration.
Note:
A new EC calibration automatically clears the %NaCl calibration . “NO CAL”
message is displayed blinking.
10.2. 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. Press CAL/EDIT to enter Calibration mode.
2. Use the
keys to select a different standard value.
When the reading is stable and close to the selected calibration standard, STD and
ACCEPT tags are displayed blinking.
