Hanna Instruments HI 221, Instruction Manual, Page: 14 / 40

14
When using an appropriate HANNA P Type BNC electrode with pin, HI 221
and HI 223 will assess electrode condition and response time during each
calibration, and 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 de-
crease 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 condition and response are also
visible when viewing GLP data.
If the instrument is not calibrated or it has been calibrated only at one point
or if the calibration history was deleted, the electrode condition and the
electrode response gauges will be empty.
SLOW FAST POOR GOOD
SLOW FAST POOR GOOD
ELECTRODE CONDITION &
ELECTRODE RESPONSE TIME
a result of unacceptable offset variation or in the second calibration buffer as
a result of unacceptable slope variation. This variation may result from dirt on
the electrode or contaminated buffer. Refer to the electrode cleaning procedure
or use fresh buffer.
CONTAMINATED BUFFER
This warning message appears in order to alert that the buffer could be
contaminated. Refresh your buffer and continue the calibration procedure.
ATC
CAL
BUFFER 1
pH
CHECK BUFFER
CFM
ELECTRODE CLEAN
ATC
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