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3.4 Sampling
3.4.1 Conditions of sample gas
(1) Dust contained in the sample gas should be completely removed with a fi lter. For the fi nal
stage fi lter, use a fi lter that allows removing dust particles of 0.3 m.
(2) Dew point of the sample gas must be lower than the ambient temperature to avoid occurrence
of drain in the gas analyzer. If vapor is contained in the sample gas, dew point should be low-
ered to 2˚C by using a dehumidifi er.
(3) If SO
mist is contained in the sample gas, use a mist fi lter or cooler to remove SO
3
Other mists should be removed by using a mist fi lter or gas dryer.
(4) Corrosive gases such as Cl
able amounts, will shorten the life of component parts.
(5) Temperature of the sample gas should be within 0 to 50˚C. Pay attention not to fl ow hot gas
directly into the instrument.
3.4.2 Sample gas fl ow
Flow of sample gas should be 0.5L/min ± 0.2L/min.
Avoid fl ow fl uctuation during measurement.
Observe the fl ow reading by a fl owmeter provided as shown in the example of the sample system
confi guration (Section 3.4.6).
3.4.3 Preparation of standard gas
Routine calibration is required by standard gas for keeping this instrument under normal operation
condition (once a week). Prepare a standard gas cylinder for zero calibration and span calibration.
Zero gas
Span gas other
than for O
2
measurement
Span gas for O
2
measurement
3.4.4 Purging of instrument inside
The inside of instrument need not be purged generally except for the following cases.
(1) A combustible gas component is contained in the sample gas.
(2) Corrosive gas is contained in the atmospheric air at the installation site.
(3) The same gas as the sample gas component is contained in the atmospheric air at the installa-
tion site.
In such cases as above, the inside of analyzer should be purged with the air for instrumentation
or dry N
.
2
Purging fl ow rate should be about 1L/min.
Purging gas, if used, must not contain dust or moisture.
, F
and HCl, if they are contained in the sample gas in consider-
2
2
Analyzer without O
2
measurement
N
gas
2
Gas with concentra-
tion of 90 to 100% of
its measuring range,
barance N
.
2
—
Analyzer with built-in O
sensor
2
N
gas
2
(O
gas of 99.9 to 100 vol% for
2
reverse range O
measurement.)
2
Gas with concentration of 90 to
100% of its measuring range,
barance N
.
2
Gas with concentration of 90 to
100% of its measuring range or
atmospheric air (21% O
).
2
(O
gas of 95 to 95.5 vol% for
2
reverse range O
measurement.)
2
10
mist.
3
Analyzer with external
zirconia O
sensor
2
Dry air
Gas with concentra-
tion of 90 to 100% of
its measuring range,
barance N
.
2
O
gas of 1 to 2%
2
INZ-TN2ZPA-E
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