Drawell DW-PH6175, Руководство по эксплуатации

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6
B. pH Calibration
The pH6175 uses one, two or three point calibration.
The 6175-3C uses two or three point calibration.
[
Note:
If the unit uses two or three point calibration, the first point
must be 6.86/7.00, and the second point can either be 4.00/4.01 or
9.18/ 10.01.]
a. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1. Turn the unit on. Press “ Clear ” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
stored in 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.
One of the buffer in the pre-selected buffer set will start to
flash.
3. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution. Allow temperature
reading to stabilize, then press and hold “ Stand ” key for 5
seconds to calibrate. The “WAIT” icon will flash until the unit
detects a stable reading. Once the unit calibrates the first
point, the selected buffer remains lit up while the remaining
two buffers start to flash. The unit is ready to be sloped at the
second buffer.
[
Note:
If the first buffer solution is 7.00 or 6.86, 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 or 10.00, at this moment, the unit will automatically
exit the calibration mode. Single point calibration is complete.
The 6175-3C has not this single point calibration.]
4. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00/4.01
or 9.18/10.01). Allow temperature reading to stabilize, then
press “ Slope ” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
second point, the selected two buffers lit up and the
remaining buffer starts to flash. The unit is ready to be sloped
at the third buffer.
[ Note: At this moment, press the “ Mode ” key, the unit will