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9. Select pH Calibration (
→
→
→
→
F1:Cal.
→
→
→
→
F1:pH
).
10. When the reading has stabilised, press the
key to calibrate. If a 1
point calibration has been performed, the "
∗
∗
∗
∗
" will not be removed until
a full 2 point calibration has been performed.
11. Rinse the pH and Temperature sensors in distilled water and blot
them dry.
12. Place both sensors into a small sample of pH4.01, pH9.18 or pH10.01
Buffer, so that the bulb and reference junction are both covered, as
per the diagram in step 8, above.
DO NOT
place the sensors directly
into the buffer bottle.
pH9.18 and pH10.01 buffers are unstable once the bottles have
been opened. Discard immediately after use
.
13. Select pH Calibration (
→
→
→
→
F1:Cal.
→
→
→
→
F1:pH
).
14. When the reading has stabilised, press the
key to calibrate. The
"
∗
" will now be replaced by a decimal point, if calibration was
successful.
15. The
WP-80M
is calibrated and ready for use in this mode. Discard the
used samples of buffer.