Sper Scientific 850055 pH Meter - Advanced - Manual (Page 19)

19
PH PROBE CALIBRATION
8. When the measured pH value is stable and the Ready
function is enabled (Refer to P5.0 READY ICON page
15). “READY” will appear on the left side of the LCD.
Note...
If the pH value continues to display different values, check
the buffer or probe. (Refer to TROUBLESHOOTING page
32).
9. NIST buffer: Skip to step 10. CUSTOM buffer: Follow
instructions for your selected buffer solution:
pH 4
Press HLD/REC. 4.50 appears on the secondary
display. Use ▲ or ▼ to adjust to 4.00.
pH 7
Press HLD/REC. 4.50 appears on the secondary
display. Press HLD/REC again. If the secondary value
does not default to 7.00, use ▲ or ▼ to adjust to 7.00.
pH 10
Press HLD/REC. 4.50 appears on the secondary
display. Press HLD/REC again. 7.00 appears on the
secondary display. Press HLD/REC again. 9.50 appears
on the secondary display. Use ▲ or ▼ to adjust to
10.00.
10. Press MN/MX/AV to confirm. Press ESC to save and
return to Normal Mode.
11. Change the buffer solution and repeat previous steps to
achieve multiple point calibration. Clean the probe in
between each buffer.