Thermo Fisher Scientific Alpha DO 2000 User Manual
Page 25
Instruction manual
Alpha DO 2000
4. Press
▲ or ▼ key to select the desired unit for barometric pressure (“BAR”,
“mmHG” or “PSI”I). Press the ENT key to confirm.
5. Press
▲ or ▼ key to set the barometric pressure according to the selected
unit in step 4. Press the ENT key to confirm.
6. Put sensor in zero point solution or nitrogen. The temperature compensated
sensor current for zero point (in nA) is displayed. The “CAL” and electrode
symbol
start flashing. Once the reading stabilizes, the flashing symbols
disappear and “READY” comes on. Press ENT key.
7. Press
▲ or ▼ key to accept new zero current with “YES” or to reject the new
calibration value with “NO”. Press ENTER key to confirm your selection
Î NOTE: Accepting the zero point will reset the zero offset settings made in OFS
menu.
8. The display shows “2ND PNT”. Press ENT key to proceed with the calibration
of slope.
9. Put sensor in the calibration solution or air. The temperature compensated
sensor current (in nA) for the second point will be displayed. The “CAL” and
electrode symbol
start flashing. Once the reading stabilizes, the flashing
symbols disappear and “READY” comes on. Press ENT key.
10. Default calibration values for saturation or concentration are shown. Press
▲
or
▼ key to select the desired saturation (“SAT %”) or concentration (“Con
ppm” or “Con mg/l”). Press ENT key to confirm.
11. The transmitter returns to the Measurement mode.
Î NOTES:
• If you entered the Calibration mode from the Setup mode, the transmitter will
return to the setup menu.
• If there is a calibration error the transmitter displays “ERR”. In this case, press
▲ and ▼ keys simultaneously (escape) to restart the calibration beginning
from step 1.
• When calibrating with manual temperature compensation, the transmitter
automatically changes from the preset process temperature to the calibration
temperature. After leaving the Calibration mode, the transmitter switches back
to the process temperature (for setting the calibration temperature and the
process temperature, see section 6.3).
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