Thermo Fisher Scientific Alpha DO 2000 - Manual (Page 23)

Instruction manual
Alpha DO 2000
5.2 Calibration
Calibration is always carried out in the units (%, mg/l or ppm) selected in the
Setup mode. The transmitter allows a 1-point or 2-point calibration for
dissolved oxygen.
5.2.1 One-Point Calibration
SETUP SETUP SETUP
SETUP
HOLD HOLD
HOLD
CAL
HOLD
1-PT
2-PT
CAL
CAL
Rh
%
100
DO
CAL ENT ENT ENT
1 2
2
3
CAL
HOLD
BAR
PRES
PRES
PRES
HOLD
H9
HOLD
PSI
4
4
4
CAL
CAL
CAL
SETUP CAL
HOLD
BAR
1.013
5
ENT ENT
SETUP CAL
HOLD
65.3
6
ENT
READY
SETUP CAL
HOLD
SAT
100.0
7
ENT SETUP CAL
25.0
100.0
8
MEAS
% %
1. Enter Calibration mode as described in section 5.1. The display shows “CAL
DO”. Press ENT key to start calibration.
2. The display shows “1-PT CAL” by default. If “2-PT CAL” is shown, use ▲ or
▼ keys to select one-point “1-PT CAL”. Press ENT key to confirm the 1-point
selection.
3. Press ▲ or ▼ key to set the relative humidity. Press ENT key to confirm.
4. Press ▲ or ▼ key to select the desired unit for barometric pressure (“BAR”,
“mmHG” or “PSI”). Press ENT key to confirm.
5. Press
▲ or ▼ key to set the barometric pressure according to the selected
unit in step 4. Press ENT key to confirm.
6. Put sensor in the calibration solution or air. The temperature compensated
sensor current (in nA) is displayed. The “CAL” and and electrode symbol
start flashing. Once the reading stabilizes, the flashing symbols disappear and
“READY” comes on. Press ENT key.
7. 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 ENTER key to confirm.
8. The transmitter returns to the Measurement mode.
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