Ec / Tds; Preparation; Calibration - Milwaukee MW180 MAX Instruction Manual

38 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.