Trans instruments WalkLAB HP 9010 Operation Manual page 12

7.26 If the meter does not recognize the buffer, it means the electrode
could be defective or the buffer solution is wrong. Calibration
cannot proceed until they are rectified.
7.27 When the meter beeps, Offset point is established.
7.28 Now 1.68, 4.01, 9.18 and 12.45 will alternate on main display.
7.29 Rinse the pH electrodes and temperature probe in distilled water,
blot or shake dry then dip into next slope buffer solution.
7.30 When the meter recognizes the buffer, it will appear blinking.
7.31 If the value is different from the buffer solution then the electrode
could be damage.
7.32 Wait for meter to beep, Slope point is established.
7.33 The remaining buffer values will alternate on the main display.
7.34 Repeat step 7.29 to 7.33 sequentially up to 4 slope points.
7.35
At least 2 calibration points (offset & slope) must be established in each
session of calibration. Otherwise, calibrated point will not register.
7.36 When calibration is completed, press
points and return to normal reading mode.
7.37 Anytime during calibration, press
Calibration with Custom Standard
7.38 Make sure the unit is properly installed and electrode connected.
Always rinses the electrode with distilled water before and after each
test. This is to prevent solution carry over or cross contamination.
Standard solutions must maintain highest purity; otherwise the
7.39 Rinse the pH electrodes and temperature probe in distilled water
and dip in the buffer solution. You will need at least two (2) buffers.
Always begin with "Offset" calibration first.
7.40 Press
CAL
it is in calibration mode.
7.41 Press the
7.42 When the meter beeps, it means reading has stabilized and ready
for calibration. Press
7.43 A preset value of 1 1 1 1 .40
requesting for a slope value.
7.44 Rinse the pH electrodes and temperature probe in distilled water,
blot or shake dry then dip into next slope buffer solution.
7.45 The meter will recognize the nearest buffer value and will appear
blinking while it beeps in wait of a complete action.
meter's accuracy could be compromised.
and display will show 7 7 7 7 .00
button up / down to adjust the value.
SELECT
ENTER
40, 3 3 3 3 .80
40 40
ENTER
EXIT for 2 seconds will abort all.
00 while
00 00
to confirm to calibrate to the point.
80, and 12
12.. 6 0
80 80 12 12
11
to store all calibrated
blinking, indicating
CAL
. 6 0 will now alternate
. 6 0 . 6 0