7
Zero calibration
To accurately measure low concentrations when measuring O
2
, use nitrogen gas for calibration.
1.
Set the needle so it can suction the nitrogen gas.
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” (page 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 zero calibration again.
<When nitrogen gas cannot be prepared>
Initialize the instrument and then perform span calibration.
Refer to the sections “Initialization” (page 18 ) and “Span calibration” (page 6 ) for details on the operation meth-
ods.
Caution
Summary of Contents for PACK MASTER RO-105S
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