10
completed and the instrument is ready to be sloped at
a second buffer.
Allow sufficient time for the electrode and ATC/Temp
probe to stabilize before taking any action.
2.4 Remove the pH electrode from buffer 7.00 (or 6.86),
rinse with distilled water and immerse it in buffer
4.00(4.01) or 9.18(10.01). Set the instrument to the
temperature of the 2nd buffer as in 2.2. The displayed
temperature must be less than 60. ℃
2.5 Press the [SLOPE] key. the SLOPE annunciator will stop
flashing and stay on. The WAIT annunciator will start
to flash, indicating that the instrument is waiting
for a stable reading. The display will be locked to
the value of the second buffer corresponding to the
temperature of the second buffer as set in 2.3 . When
a stable reading is reached, the WAIT annunciator will
stop flashing and stay off. The instrument will
calculate and compensate for the pH electrode slope
deviation corresponding to the values of the two
calibration buffers. The instrument is now dual point
calibrated and ready for measurements.
3. Calibration with ATC/Temp probe in pH mode.
3.1 Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the
instrument. The ATC annunciator on the LCD will be on.
Press the [MODE] key for the LCD to display pH and the
AUTOLOCK annunciator to be off.
3.2 Rinse the pH electrode and ATC/Temp probe in distilled
water and immerse them in pH buffer 7.00(6.86).the
instrument will display the buffer temperature.
3.3 Allow sufficient time for the electrode and ATC/Temp
