ADS420 | DISSOLVED OXYGEN SENSOR | OI/ADS420-EN REV. B 7
4 Calibration
This section describes how to calibrate the sensor and involves
measuring the sensor's sensitivity to oxygen by exposing the
sensor to water-saturated air.
Calibrations are initiated via the Cal prompt displayed on
Operator pages or via the Calibrate and Advanced menu
items on the Access Level
instructions OI/AWT420 for all transmitter menu options.
Note.
• Do not perform a calibration until the sensor and transmitter
are installed and ready for operation.
• Before removing the sensor for calibration purposes, set the
currents outputs and alarms to Hold (enabled via the
Operator Menu/Manual Hold function).
• After calibration and sensor replacement, reset the currents
Calibrate menu below.
Calibrate menu
Calibrate
Menu
Exit Select
Used to calibrate the sensor.
Access to the Calibrate menu is permitted via the Calibrate and Advanced levels only.
Note. During calibration, current outputs and alarms are set to Hold automatically if
Hold Outputs is enabled (see below).
Menu Comment Default
S1 (to 4) :DO Select the optical dissolved oxygen sensor to calibrate.
Probe Calibration
Calibration Type
calibration in an oxygen-depleted solution, e.g. sodium sulfite (Na
SO).
Hold Outputs Enable/disable the Hold Outputs function. If enabled, the current outputs and alarm functions are
held during calibrations.
Enabled
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