12
the WAIT annunciator will flash. This means that 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 set in 2.2 (refer to
table 1). When a stable reading is reached, the WAIT
annunciator will stop flashing and stay off. The SLOPE
annunciator will start to flash, indicating that the
standardization at buffer 7.00 (or 6.86) is completed and the
instrument is ready to be sloped at a second buffer.
If "
Er 1
" is displayed, check that the correct buffer is used
and that the electrode offset is greater than - 1.5 and less
than +1.5 pH. Replace the buffer and/or the pH electrode.
Press the [CLEAR] key and repeat from 2.1. "
Er 1
" may
appear if the [STAND] key is pressed before the electrode
and ATC/Temp probe settle to within ±1.5 pH of the buffer
value. 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 in buffer 4.01 or 9.18 or
10.01. Set the instrument to the temperature of the 2nd
buffer as in 2.2. The displayed temperature must be greater
than 60.
℃
2.5 Press the [SLOPE] key. the SLOPE annunciator wills 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 (refer to table 1). When a table
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
