Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer - Manual (Page 53)

IM 12J05C01-01E
6-2 Calibration Procedure
6-2. Calibration procedure using air calibration
method
6-2-1. Preparation
Move the sensor to a maintenance site and wash
off any dirt on the membrane. Lightly wipe off any
remaining water from the membrane with a soft tis-
sue.
Expose the sensor to the air in an environment
where there is no temperature change and no wind
(a convenient way to accomplish this environment is
to place the sensor in an empty bucket).
Note: If sensors are used without temperature
compensating element, the temperature
must be adjusted to ambient temperature in
service code 13.
6-2-2. Procedure for air calibration
NO
SC21=0
NO YES
NO YES
NO
The instruments waits for
the reading to stabilise.
(The display flashes)
When reading Is stable,
the CAL END message
appears.
NO YES
YES
12J6B2-22
Press the MODE key. CALIB appears in the display, and the
YES/NO key flags flash. Press YES.
NO YES
NO YES YES NO
After briefly displaying WAIT,
the display returns to the
normal readout.
YES
Sensor can be returned
to process water.
Press YES for single point
adjustment.
ABLE
NO
NO YES
NO
NO
YES
YES
Go to
6-4-2
Go to
6-4-3
Go to
6-3-3
NO
NO YES
SC21=1
NO
ENT
FAIL TEMP.MAN
YES NO
ENT
NO MODE YES
MODE
%sat
ppb
CAL
DISPLAY
ppm
HOLD
OUTPUT
SET HOLD
SERVICE
YES NO
YES YES
YES YES
YES YES
to *1
NO
from *1 NO
NO to *1
Note: To start calibration with a zero oxygen
(N2 gas.)