Last Calibration Data - Hanna Instruments HI 504 Instruction Manual

LAST CALIBRATION DATA

If the meter is set as pH controller, the following data about
the last calibration are stored in the EEPROM:
• Date
• time
• offset, in mV
• slope, in mV/pH
• up to two buffers.
If the meter is set as ORP controller, the data stored in the
EEPROM are the following:
• Date
• time
• first calibration point
• second calibration point.
While displaying these data the pH/ORP controller remains
in control mode.
To enter the last calibration data
mode, press the CAL DATA key.
If the meter has never been calibrated
or an EEPROM reset has occurred, no
calibration data is shown when CAL
DATA is pressed. The "no CAL" mes-
sage will blink for a few seconds, then
the meter skips back to the previous
mode.
If the meter is set as pH controller, once entered the last cali-
bration data, the following messages could scroll twice on
the primary LCD before showing the calibration date:
• "Old probe"
• "Dead probe"
• "Probe needs calibration".
Otherwise the last calibration date will
appear on the primary LCD displayed
as DD.MM format, while the second-
ary display will show the last two digit
of the year.
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Pressing the key, the meter will cycle through the following
steps in reverse order, i.e. beginning from last buffer.
Note
At any time pressing LCD or CAL DATA key the meter will
return to the regular operating display.
• Press the æ
or key to view the
time of last calibration. The second-
ary display will show "HOU" to
indicate "hour and minute" while the
primary LCD will show the time as
HH:mm format.
• Press the æ
or key again to view
the offset in mV at the time of last
calibration. The secondary display
will show "OFF" to indicate "offset".
• Press the æ
or key again to view
the slope in mV/pH at the time of
last calibration. The secondary dis-
play will show "SLO" to indicate
"slope".
• Press the æ
or key again to view
the first memorized buffer at the time
of last calibration. The secondary
display will show "BUF1" to indicate
"first buffer".
• Press the æ
or key again to view
the second memorized buffer (if
present) at the time of last calibra-
tion. The secondary display will show
"BUF2" to indicate "second buffer".
• Press the æ
or key again to re-
turn to the first CAL DATA display
(date) at the time of last calibration.
Note
When the "Measurement input selection" item is set to "Digi-
tal Transmitter" the displayed last calibration data refer to the
Digital Transmitter and is stored in that device. This does not
mean that the calibration data of the process controller are
lost, but they come back when changing back the "Mea-
surement input selection" later.
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