Measuring with Galvanic Dissolved Oxygen (DO) Probes 144
• Press CFM to save.
Salinity Source
Option: Setup, Probe
Selects the source for salinity compensation.
• With Salinity Source selected, press Setup to use the Salinity Factor value.
• With Salinity Source selected, press Probe to use the salinity value from a connected EC probe.
23.5. CALIBRATION
HI520 controller allows two types of dissolved oxygen calibration procedures:
•
Standard single or two‑points calibration using water‑saturated air or air‑saturated water and a zero
oxygen solution to verify that the probe is working correctly and establish a slope
•
Process single‑point calibration performed with the calibrated probe (two points) installed in the process.
Process calibration allows the user to adjust the measured dissolved oxygen value to match the value
determined with a reference device.
Notes: See 6.1 Probe Settings Navigation for Temp. Offset & Temperature Calibration Procedure section.
To calibrate the internal pressure sensor, see Pressure Calibration in 13 Technical Menu section.
23.5.1. User Calibration at 100 % and % Saturation
Preparation
• Ensure (visual inspection) no bubbles are trapped between the cathode and membrane, and the probe is
correctly wired and connected to the controller.
•
Verify the temperature is reading correctly. The temperature value can be adjusted from the controller’s
Probe Setting menu, in Channel Setup.
• Verify the controller’s barometric pressure reading with a reference meter. Pressure value can be adjusted
from the controller’s Technical Menu.
•
Go to Probe Setting in Channel Setup to set measurement mode (Meas.Mode) and measurement unit
(Meas.Unit). Select between:
` DO_%Sat (% saturation) with unit displayed in %Sat
` DO_Conc (Concentration) with unit displayed in mg/L or ppm
• Set the Salinity value if the probe will be exposed to ocean or brackish waters.
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