Operational Guide
35
If the instrument is not calibrated the calibration history was deleted, or it has
been calibrated only at one point, the electrode condition and the electrode
response gauges will be empty.
For a continuous display of the electrode’s condition and response, daily
calibration is necessary. This information can also be viewed in the GLP data.
Junction Condition (HI 11311 And HI 12301 Only)
edge™ pH Sensor Check™ feature will assess the health of the pH electrode’s
reference junction during each calibration. The junction gauge may be viewed
directly in GLP but will also blink a warning on the display if the junction is
compromised (not 100%). Should this happen, the junction condition will
appear on the display with the junction blinking. The Junction Condition is a
function of the electrode’s reference impedance which should be kept low.
If the reference junction becomes fouled from a precipitate or coating, the
impedance will rise and cause the pH measurement to drift. This diagnostic
feature serves as a warning to clean the sensor.
pH
Calibration
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