Measuring with EC Probes 132
TDS Factor
Option: 0.00 to 1.00
• With item selected, press Set to modify. The flashing value indicates that it can be modified by using the
ud keys.
• Press CFM to save.
Measurement Unit
Option: μS (EC), mg/L or ppm (TDS), Ω (RES), Sal% (Sal%), Salppt (Sal ppt), Salpsu (Sal psu)
With Meas.Mode set to TDS, use the virtual key to toggle between options.
22.4. CALIBRATION
HI520 controller allows two types of EC calibration procedures:
• Standard two‑point conductivity calibration with standards for cell factor determination :
` 0.000 μS/cm for offset
` 84.0 μS/cm, 1413 μS/cm, 5.00 mS/cm,12.88 mS/cm for the 0.1/cm cell
` 80.0 mS/cm, 111.8 mS/cm additional standards for the 1.0/cm cell
•
Standard single point salinity calibration in 100 % salinity standard, with the controller set to Sal %
measurement mode after the EC range has been calibrated
• Process single point calibration performed with calibrated probes installed in the process
Note: EC measurement mode (Meas.Mode) supports a one-point calibration with a known conductivity
solution that is not temperature compensated.
• With Mode selected, go to Probe Setup, press the ud keys to select Temp. Comp.
•
With parameter highlighted, press Modify for the drop-down options list.
•
Press the ud directional keys to select None.
22.4.1. Standard Conductivity (EC) Calibration
Preparation
• Always clean the probe in distilled water, shake off water droplets, and allow to dry prior to calibration.
• Suspend the probe in the air and use 0.000 μS/cm as first calibration point.
• Inspect the probe for debris or blockages.
• Use an EC calibration standard with a value that is close to that of the sample.
• Ensure that probe’s holes are completely submerged.
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