Manual

<6.OperationandParameters>
6-10
IM 11M10B01-01E
rEV
▼↓↑▲
MODE
CAL
▼↓↑▲
▼↓↑▲
[ENT]
1. 8
rEV
PPM
[ENT]
▼↓↑▲
%
To “rEV”
Hold down
for 2 seconds.
Return to “rEV.”
Figure6.13 DisplaySoftwareRevision“rEV”
6.2 Calibration“CAL”
Be sure to perform calibration in the measurement mode after the warm-up operation ends.
Calibration cannot be performed during the warm-up operation. If an error occurs during calibration,
that calibration will be invalid, and keys other than the [MODE] key become invalid. Hold down the
[MODE] key for 2 seconds to return to the beginning of the calibration “CAL” and press the [MODE]
key again to return to the measurement state.
With respect to the calibration methods of the OX400, there are four types of method.
1)3-point(All)calibration“ALL”
By performing calibration at the three points of 10 ppm, 1000 ppm, and Air, the linearity for the
entire zone between 0-10 ppm and 100% O
2
is guaranteed. Gas used for calibration is restricted
to the ranges of O
2
concentration as follows.
 (1)8ppm≤10ppmgas≤20ppm       
(2)800ppm≤1000ppmgas≤2000ppm      
(3) O
2
concentration in Air: 20.6% (Normal air is within this range)
NOTE: Be sure to use gas that meets conditions (1), (2), and (3) for calibration.
2)2-pointcalibration“2Pnt”
Select zero and span calibration points in the measurement range you will use to perform
calibration. However, gas used for calibration is restricted to the ranges of O
2
concentration as
follows.
<When the range is 1000 ppm or less.>
(1) Zero gas is 8%FS or more.
(2) Span gas is less than 120%FS.
(3) Between zero and span of the smallest range must be more than 20%FS of the MANUAL
range.
Example1:Twopointsof1ppmand3ppminthe10ppmrange   
Example2:Twopointsof20ppmand40ppminthe100ppmrange
< When the range is more than 1000 ppm.>
(1) Zero gas is 800 ppm or more.
(2) Span gas is 100%FS or less.
(3) Between zero and span of the smallest range must be more than 2000 ppm.
Example3:Twopointsof0.6%and0.8%inthe1%range   
Example4:Twopointsof20.6%and90%inthe100%range
3)1-pointcalibration“1Pnt”
Principally, 1-point calibration allows obtaining an accurate concentration in an area near the
calibration point, but the error may become greater as the distance from the calibration point
increases. This is a useful calibration method when it is used in some limited areas. Select
one point in an area as close to the concentration you want to measure as possible to perform