9
There are two sets of buffer available for this unit :
7.00,4.01,10.01pH
and
6.86,4.00,9.18pH
.
You can change the buffer set by turning OFF the unit then pressing
and holding the [STAND] key as you turn ON the unit again.
You can see what buffer set you are using if the unit is uncalibrated
and you are in pH mode. The unit will display 7.00 if you are using
the first set and 6.86 if you are using the second set.
pH CALIBRATION
Turn ON the instrument by pressing the [ON/OFF] key. The
instrument will be in a state when it was turned off. It is not
necessary to press the [CLEAR] key.
1. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1.1 Connect the combination pH electrode to the BNC
connector and
the ATC/Temp probe to into the ATC/Temp connector of
the
instrument. The ATC annunciator on the LCD will be on.
Press
the [MODE] key as necessary to go to pH-AUTOLOCK
mode.
1.2 Rinse the pH electrode and ATC/Temp probe in distilled
water
and immerse in pH buffer 7.00(or 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 (or 6.86), as measured in step 1.2
