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8. CALIBRATION
8.1 Kinds of standard gas
8.1.1 When not using zirconia O
2
sensor
(1) Zero gas: N
2
or atmospheric air/instrument air depending on specification (when without verifi-
cation stipulated in the laws for measurement and weighing)
(2) Span gas: Gas of 90% or more full scale for each component, remainder is N
2
(span gas for low
range will be delivered unless otherwise specified)
8.1.2 When using zirconia O
2
sensor
(1) Zero gas: Air (Span gas of the O
2
analyzer in the laws for measurement and weighing).
(2) Span gas: 1 to 2% O
2
, remainder is N
2
. (Zero gas of the O
2
analyzer in the laws for measurement
and weighing).
Gas of 90% or more full scale for other than zirconia O
2
sensor, remainder is N
2
.
Note: For separately calibrating the low and high ranges of the zirconia O
2
sensor, supply 9 to
10% O
2
and the remainder N
2
for the low range (10%) and use air for the high range
(25%).
8.2 Preparation of standard gas
The standard gas to be used for calibration is delivered in a separate package from the locker.
Check the kind of standard gas to be used according to the sampling system diagram, and set it at the
prescribed location.
Before starting calibration, attach a pressure regulator to the standard gas.
8.2.1 How to mount pressure regulator for standard gas cylinder
(1) Before mounting a pressure regulator to the gas cylinder, clean the gas cylinder adapter. Entry of
dust into the pressure regulator may result in gas leaks.
(2) If packing is not inserted in the mounting nut for the cylinder or it is damaged, replace it with
supplied spare one.
(3) Use a spanner of a proper size, fasten the cylinder mounting nut to the gas cylinder. Mount
supplied joint to the outlet according to Item “Sampling system block diagram”.
(4) Loosen the pressure controls and then tighten the outlet controls.
(5) Open a valve of the gas cylinder, and the pressure gauge on the high pressure side indicates a
pressure of the gas cylinder by flowing gas into the pressure regulator.
(6) Turn the pressure controls clockwise to increase the secondary pressure; adjust the pressure con-
trols so that a pressure gauge on the low pressure side reads 30 kPa.
(7) Open the outlet controls to release gas.
Danger
• When handling standard gas such as calibration gas, read the instruction manual for the standard gas for
correct handling. Special care should be taken when handling hazardous gas such as CO gas and the like
to prevent poisoning.