7
OPERATIONAL PROCEDURES
A. pH Buffer Set Selection
The 6011M/6011EU meter has two buffer sets: 7.00, 4.01,
10.01 pH and 6.86, 4.00, 9.18 pH. The meter is factory
pre-set at 7.00, 4.01 and 10.01 pH.
To change the buffer set, turn off the unit, then press and hold
the
“Stand”
key while turning on the unit again.
[Note: There is no need to repeat this procedure every time
the unit is power up unless one decides to change the buffer
settings.]
B. pH Calibration
The 6011M/6011EU up to 3 point calibration.
[
Note:
If the device is required to perform more than one
calibration points, the first calibration point must be 6.86/7.00
pH.]
a. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1. Turn the unit on. Press
“Clear/Enter”
key for 5 seconds, all
LCD elements will lit up. The meter clears all calibration values
stored in the internal memory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will lit up. “pH” icon and “AUTO” icon will lit up. The
“buffer” icon will flash.
3. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution (either 7.00 or 6.86
pH). Allow temperature reading to stabilize, then press and
hold
“Stand”
key for 2 seconds to calibrate. The “ ” icon will
flash until the unit detects a stable reading. Once the unit
calibrates the first point, the “4.00
（
4.01
）
” and “9.18
（
10.01
）
”
icon will flash. The unit is ready to be sloped at the second
buffer.
[
Note:
If the first buffer solution is 7.00 or 6.86 pH, at this
moment, press the
“Mode”
key. The unit will exit the
calibration mode. Single point calibration is complete.
If the first buffer solution is 4.00, 4.01, 9.18 , 10.01 pH, at this
moment, the unit will automatically exit the calibration mode.
