YOKOGAWA OX400, Руководство пользователя

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<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 calibration. However, there are the following limits to the O
2
concentration. Be sure
to perform calibration in that range of the O
2
concentration. O
2
concentration limits: 0.9 ppm
or more and 12% or less, or between 35% and 100%.
(4) Air calibration “AIR”
This is air-only calibration. Ues the cleanest air possible to perform calibration.
Note: If you press the [MODE] key during calibration to exit the calibration mode, that calibration becomes invalid.
8th Edition : Jan. 10, 2019-00