Hanna Instruments HI 120 - Manual (Page 21)

21
CLEAN ELECTRODE
This warning message appears in order to alert the user that some dirt or
deposits could be on the electrode. Refer to the electrode Cleaning Procedure.
This ensures the removal of film, dirt or deposits on the glass bulb and
reference junction.
CONTAMINATED BUFFER
This warning message appears in order to alert that the buffer could be
contaminated. Refresh your buffer and continue the calibration procedure.
CHECK ELECTRODE / CHECK BUFFER
This warning message appears when the electrode slope exceeds the highest
accepted slope limit (110%). Check your electrode and use fresh buffers.
CLEAN ELECTRODE / CHECK BUFFER
This warning appears in order to alert the user that the electrode can be
dirty or the buffer contaminated. Refer to the electrode Cleaning Procedure
and use fresh buffers.
ELECTRODE CONDITION &
ELECTRODE RESPONSE TIME
When using an appropriate HANNA BNC electrode with pin, the instrument
will assess electrode condition and response time during each calibration and
will display the calibration status for the rest of the day.
The digital gauge for electrode condition is a representation of the offset
and slope performance of the electrode. The response gauge is a function
of the stabilization time between the first and second calibration buffers.
These gauges reflect electrode performance and should be expected to
slowly decrease over the life of the electrode.
The condition and response gauges show the electrode’s condition at the
time of calibration only and are displayed for the rest of the day the
calibration is performed. For a continuous display of electrode condition at
the time of calibration, daily calibration is necessary. The electrode
condition and response time are also visible when viewing GLP data.
If the instrument is not calibrated, it has been calibrated only in one
point, or if calibration history was deleted, the electrode condition and
response gauges will be empty.