65
Err
Or
mESSAGES
13. ERROR MESSAGES
The instrument shows clear warning messages (refer to the instrument’s on-display message area,
bottom of the screen) when erroneous conditions appear, and when measured values are outside the
expected range.
The information below provides an explanation of the errors and warnings, and recommended action
to be taken.
Displayed Message
Explanation & Recommended Action
“Temperature sensor broken”
Temperature sensor needs to be replaced.
“Temperature under/over range”
Temperature outside specified range.
Verify the temperature probe is correctly connected to the
meter. Replace probe if necessary.
“Under/over compensation range”
During pH calibration, the temperature is under/over the pH
buffer compensation limit.
”mV under/over range”
Outside range in the corresponding scale.
Ensure the glass bulb and reference junction are submerged and
the sample is within specified range.
Check that the glass bulb is completely filled with electrolyte
and there are no trapped air bubbles.
”Broken electrode”
The meter fails to calibrate or gives faulty readings.
Replace the electrode.
”pH over range”
Occurs when apparent pH value is more than 20.0 pH.
Dry membrane (or junction).
Soak electrode in
HI70300
Storage solution for at least 30
minutes.
”pH under range”
Occurs when apparent pH value is less than -2.0 pH.
Dry membrane (or junction).
Soak electrode in
HI70300
Storage solution for at least 30
minutes.
”pH out of calibration range”
Displayed when the measured value is outside calibration range.
”Rel. mV offset range”
Outside range in the corresponding scale.
Ensure the glass bulb and reference junction are submerged and
the sample is within specified range.
Check that the glass bulb is completely filled with electrolyte
and that there are no trapped air bubbles.
”Rel. mV under/over range”
”Factory calibration expired”
Contact the Hanna technical support for the periodic factory
calibration.
Summary of Contents for HI6221
Page 1: ...INSTRUCTION MANUAL HI6221 pH and ORP Benchtop Meter...
Page 27: ...27 System Menu Items Tap Delete The instrument prompts for confirmation...
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