29
CAL 1
0.00
mg/L
ATC
25.0
C
DO
MEAS
CAL 1
0.00
mg/L
ATC
25.0
C
DO
DO/O
2
/Air/TEMP Meter
The basic condition is as follows.
¡
Salinity and Altitude = 0
Preparation
Connect probe and temperature sensor to Input and ATC jack respectively.
Clearly rinse probe with distilled water and blot dry with tissue.
Prepare solution for measurement and magnetic stirrer.
It takes 1~10 minutes to polarize probe because of using polarographic probe.
Calibration and M easurement
- DO Calibration and M easurement
Constantly stir solution by using magnetic stirrer.
Saturate the solution with oxygen by the bubbling equipment at least 1~2 hours in
advance before calibration.
Put saturated solution into BOD bottle and cap to minimize the exposure in the air.
Zero Calibration
There are two ways of zero calibration. In ready condition, press
Cal
key to enter
calibration mode. The display is shown as follows.
1)
In case of calibration with solution not containing DO,
add excess sodium sulfite, Na
2
SO
3
, and a trace of
cobalt chloride, CoCl
2
, to bring DO to zero. Put probe
into this solution.
2) In case of calibration without solution, remove probe
from Input and press
M easure
key.
If the reading is stable, press
Cal
key, and then Cal 1 OK
message is displayed in the upper field and set
automatically.
Chapter V Calibration and Measurement
N eo M et
