Iijima PACK MASTER RO-105S, Руководство по эксплуатации

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6
3. Calibration
The calibration process adjusts the instrument measured value so that the span point and zero point during O
2
measurement match the sensor output when the reference gases (atmosphere, nitrogen) were measured.
Span calibration
Perform span calibration once a day before starting measurements. Ideally, span calibration
should be performed when the temperature of the oxygen sensor and temperature sensor
are sufficiently stable, such as first thing in the morning before operating the air conditioning
system.
If the deviation from the true value can be tolerated by about 5%, span calibration should be performed when the
oxygen concentration in the atmosphere is 20%O
2
or less, or 22%O
2
or more. In this case, the error will be 0.05%
O
2
when the measurement concentration is 1%O
2
.
1.
Place the needle in the atmosphere.
2.
Press .
The MENU screen opens, and “CAL” is selected (flashes).
3.
Press .
The O
2
CAL screen opens.
* If even one measurement has been taken, the previous measured value will display.
4.
Hold down for 1 second or more.
The calibration starts, and the Stability Decision screen opens.
A beep sounds, CAL complete appears (approx. 1 second), and then the O
2
MEASURE screen opens. The calibration process is completed.
The calibration value is saved even if the power is turned OFF, the batteries are removed, or the AC adapter is
disconnected.
If the “Sensor error” message appears, refer to the section “Error Messages” (pages 27 ) and confirm and remedy
the situation.
The measured value (calibration value) may be high or low if a strong impact is applied on
the instrument unit or if the temperature changes drastically. In this case, wait for some time
and then perform span calibration again.
Caution