9
MA300TS-0210
(2) Span calibration
Perform span calibration once a day before starting measurements using the following procedure.
There are two types of span calibration: air calibration and saturated water calibration. Refer to the following explanation
and procedure, and select the span calibration method that matches your application.
1. Air calibration method
This simple calibration method calibrates using the atmosphere.
It is an easy calibration method, but it may be affected by changes in the atmospheric temperature around the water
temperature sensor.
Step 1. Release the oxygen sensor to the atmosphere and stabilize the temperature.
The sensor cannot be calibrated accurately if the temperature changes. Sufficiently stabilize the temperature
when the atmospheric temperature is stable, such as before turning on the air conditioning.
Step 2. Change the instrument setting to “Set to AIR”. (Perform only the first time.)
Refer to section “3. Setting the Span Calibration Method (Saturated water calibration/air calibration)” on page 8
of this manual.
Step 3. When the DO MEASURE screen is displayed, press .
The MENU screen opens, and “CAL” is selected (flashes).
Step 4. Press .
The DO CAL screen opens.
Step 5. When the indicated value stabilizes, hold down for 1
second or longer.
The stability is decided, and after approx. 10 seconds “CAL complete” appears to indicate that the calibration is
complete.
The DO MEASURE screen opens when the calibration is completed.
The calibration value is saved even if the PACK MASTER power is turned OFF, the batteries are removed, or
the AC adapter is disconnected.
If an error message appears during the calibration, refer to the “Error Messages” section on page 19 of this
manual and the “Error Messages” section in the PACK MASTER Operation Manual.
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