10
(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. This means that the
standardization at buffer 7.00 (or 6.86) has been completed
and the instrument is now ready to 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 pH and less
than +1.5 pH. Replace the buffer and/or the pH electrode.
Press the [CLEAR] key and repeat from 1.1. "
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 actions.
If "
Er 3
" is displayed, the buffer temperature is out of the 0
to 60
℃
range. Bring the buffer temperature with in the
range . and repeat 1.2 It is not necessary to press the
[CLEAR] key.
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 4.01 or 9.18 or 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 locked to the second buffer
value corresponding to the temperature of the second buffer
(refer to table 1). 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 tot he values of the
two calibration buffers. The instrument is dual point
calibrated and is now ready for measurements.
