Thermo Fisher Scientific EcoScan CON 5 & TDS 5 - Manual (Page 9)

EcoScan CON 5 / TDS 5
8
3. CALIBRATION
3.1 Conductivity Calibration (EcoScan CON5)
The meter is capable of calibrating 1 point per range (3 points across entire
measurement range). If a range is not calibrated, the meter automatically
detects the closest range calibrated and uses the calibration information.
Calibrate to all measurement ranges to ensure the highest accuracy throughout
all measurement range. Note that EcoScan will not accept calibration values
less than 40
µ S/cm (20 ppm). All new calibration values will automatically
override existing data.
If you are measuring in solutions with Conductivity lower than 100
µ
S/cm or
TDS lower than 50 ppm, calibrate the meter at least once a week to get good
accuracy. If you are measuring in the mid ranges and you wash the probe in
deionised water and store it dry, calibrate the meter once a month. If you take
measurements at extreme temperatures, calibrate at least once a week.
Ensure that you use new Conductivity standard solutions or sachets during
calibration. Do not reuse standard solutions as it may be contaminated and
affect the calibration and accuracy of measurements. Store solutions in a dry,
cool environment if possible.
Always rinse the probe with either tap water or rinse solution before and after
each calibration/sample measurement to avoid cross-contamination. For details
please refer to section on Probe care and maintenance.
1. Pour a known standard solution e.g. 1413 µ S/cm into a clean container.
Power on the meter, and the meter will automatically enter Conductivity
measurement mode.
2. Immerse the electrode sufficiently into one of the containers of your
standard solution. Stir gently and wait for reading to stabilise (approx. 30
seconds). Tap the electrode lightly on the bottom of the container to remove
any air bubbles trapped.
3. Press CAL key to enter calibration mode. The LCD shows “CA”
momentarily, and display shows the factory calibrated value flashing.