- 20 -
pin in the buffer if symmetrical mode is enabled. The buffer annunciator
appears in LCD. Lower display shows pH 6.86 (NIST standard buffer).
Upper display shows the current uncalibrated pH reading. Allow the
reading to stabilize. LCD shows ‘
READY
’ annunciator when the reading is
stable.
Press ENT key
to confirm the reading.
3
The pH Transmitter moves to the second calibration point. The lower
display shows next standard buffer value (pH 4.01).
Use
▲
and
▼
keys
to
select your second buffer from one of the preset values: pH 4.01 or 9.18.
Remove the electrode from the first buffer, wash and then immerse it into
the second buffer. Allow the reading to stabilize. LCD shows ‘
READY
’
annunciator when the reading is stable.
Press ENT key (or CAL key)
to
confirm the reading.
4
The calibration is completed. The pH Transmitter re-calculates electrode
properties based on the calibration. The new slope (in mV) is shown in the
upper display and normalized temperature is shown in the lower display.
Press ENT key
to exit from the calibration.
55
The pH Transmitter reverts to pH measurement mode.
NOTE:
•
To exit from pH calibration mode without confirming calibration,
press
▲
and
▼
keys together
•
When confirming the buffer measurement, if the measured pH
value is not within
±
1.00pH from selected buffer value, the
de annunciator
electro
blinks and
ERR
indicator appears in the
display. This error can also occur if non-standard buffers are used
or the electrode has worn out. If this happens, press both
▲
and
▼
keys together to restart the calibration beginning from Step1
•
When calibrating with manual temperature compensation, the
meter automatically changes from the preset process temperature
to the calibration temperature. After leaving the calibration mode,
the pH Transmitter reverts back to process temperature.
