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1. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1.1 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 if necessary to go to pH-AUTOLOCK
mode.
1.2 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.
1.3 Press the [STAND] key. The STAND annunciator will be
on and the WAIT annunciator will flash. At this time
the instrument is waiting for a stable reading. The
display will be locked to the buffer value
corresponding to the temperature of buffer 7.00
(6.86) as set in 1.2. When a stable reading is
reached, the WAIT annunciator will stop flashing and
stay off. The SLOPE annunciator will start to flash.
This means that the standardization at buffer
7.00(6.86) has been completed and the instrument is
now ready to be sloped at a second buffer.
Allow sufficient time for the electrode and ATC/Temp
probe to stabilize before taking any action.
1.4 Remove the pH electrode and ATC/Temp probe from
buffer 7.00 (or 6.86) and rinse both in distilled
water. After rinsing, immerse both in buffer
4.00(4.01) or 9.18(10.01) pH.
1.5 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
