YOKOGAWA IR800G, User Manual

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IM 11G06A01-02EN
3-5
3. INSTALLATION
1st Edition : Oct. 27, 2023-00
3.4 Sampling
See 1.2 Example of sampling system configuration with IR800G/IR810G.
l
Standard requirements of sampling gas
Inlet pressure of the analyzer:
4.9 to 9.8 kPa (both samples and references)
However, the variation against the set pressure is ±2 %
Analyzer outlet pressure:
Atmospheric open
Inlet gas temperature of analyzer:
0 to 50°C
In case of 5°C or lower, however, the temperature difference between the sample and the
reference should be eliminated.
Dust : Particle size should be smaller than 0.3µm and the mass concentration should be less
than 100µg / Nm
3.
Mist : Not allowed
Moisture lower than 2°C saturation (If the temperature is 5°C or lower, the temperature difference
between the sample and the reference should be within 3°C).
Corrosive element : less than 1 ppm
Use sampling gas with care as below;
• The dust contained in sample gas should be eliminated completely with filters. The filter at
the final stage should be capable of eliminating dust of 0.3 microns.
• The dew point of sample gas must be lower than the ambient temperature for preventing
formation of drain in the analyzer. If water vapor is contained in sample gas, its dew point
should be reduced down to about 0°C through a dehumidifier.
• If SO
3
mist is contained in sample gas, the mist should be eliminated with a mist filter,
cooler, etc. Eliminate other mist in the same way.
• If a large amount of highly corrosive gas such as Cl
2
, F
2
or HCl is contained in sample gas,
the service life of analyzer will be shortened. So, avoid such gases.
• Sample gas temperature is allowed within a range from 0 to 50°C. Pay attention not to lead
hot gas directly into the analyzer.
• Flow rate must not be changed during a measurement.
• Install a flowmeter as shown in 1.2 Example of sampling system configuration with IR800G/
IR810G), and check the flow rate.
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Standard gas for calibration
Periodic calibration with standard gas (about once a week) is required for the normal use of
IR800G/IR810G. Prepare a standard gas cylinder for zero/span calibration.
Measuring components excluding O
2
Zero gas: N
2
gas
Span gas: Gas with concentration of 90% level or higher in the range of each
corresponding component (N
2
is recommended as the base gas.)
Measuring O
2
(Built-in paramagnetic O
2
analyzer)
Zero gas: N
2
gas
Span gas: O
2
gas with a concentration of 90-100% of the O
2
range (N
2
is
recommended as the base gas.)
or atmosphere (21% O
2
)