Yokogawa IR400 - Manual (Page 80)

6 - 41
IM 11G02N01-01E
When “both” from “Calibration Range” of the
Calibration Setting mode is set, span calibra-
tion is performed together with 2 Ranges.
Caution
To close the “Span Calibration” or cancel
this mode midway, press the key.
A previous screen will return.
To close "Span Calibration"
ESC
(1) Press the
SPAN
key on the Measurement
screen to display the Manual Span Calibra-
tion screen.
(2) Select CH (component) to be calibrated by
pressing the or key and press the
ENT
key. The calibration gas is supplied.
To Measurement screen after
executing Manual Span Calibration
ENT
SPAN
(3) Wait until the indication is stabilized in the
state where the calibration gas is supplied.
After the indication has been stabilized,
press the
ENT
key. Span calibration of
Range selected by the cursor is performed.
Note: For the Ch (component) for
which“AR” is selected in “6.1.1
Setting range switch mode,” the
cursor automatically moves to the
range selected in “Setting of auto
calibration component/range”
(6.2.4), and calibration is carried
out within that range.
( )
ENT
6.9.2 Span calibration
It is used to perform a span point adjustment. Supply calibration gas with concentration set to the
span value to perform the span calibration. For the span calibration gas for the NO
X
, SO
2
, CO
2
,
CO measurement, use the standard gas with a concentration of 90% or more of the range value.
For the span calibration gas for the O
2
measurement, use the standard gas with a concentration of
90% or more of the range value when measuring with the built-in O
2
sensor, and use the standard
gas of 1to 2 vol% when measuring with an external zirconia O
2
sensor.