Yokogawa IR200 - Manual (Page 16)

3 - 3
IM 11G02M01-01E
Observe the following when connecting the gas pipes.
• The pipes should be connected to the gas inlet and outlet at the rear panel of the analyzer,
respectively.
• Connect the sampling system to the instrument by using corrosion-resistant tube such as
Teflon, stainless steel, or polyethylene. In case where there is no danger of corrosion, don't
use rubber or soft vinyl tube. Analyzer indication may become inaccurate due to the adsorp-
tion of gases.
• Piping connections are Rc1/4 (1/4 NPT) female-threaded. Cut the pipe as short as possible for
quick response. Pipe of ø 4mm (inside diameter) is recommendable .
• Entry of dust in the instrumant may cause operation fault. Use clean pipes and couplings.
Purge gas inlet
Sampling gas outlet
Sampling gas inlet
Fig. 3-1 Piping
Sampling gas inlet: Connect the pipe so that zero/span calibration standard gas or
measured gas pretreated with dehumidification is supplied prop-
erly. The gas flow rate should be kept constant within the range of
1
±
0.5L/min.
Sampling gas outlet: Measured gas is exhausted after measurement.
Connect the pipe so that the gas may escape through the gas outlet
into the atmosphere.
Purge gas inlet: It is used for purging the inside of the total gas analyzer. When the
analyzer must be purged, refer to Item 3.4, Purging inside Ana-
lyzer.
Use dry gas N
2 or instrumentation air for purge gas. (flow rate of
1L/min or more should be used and no dust or mist is contained).
3.4 Sampling
(1) Conditions of sample gas
1. 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.
2. 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.
3. 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.
4. 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.
5. Sample gas temperature is allowed within a range from 0 to 50
°
C. Pay attention not to flow
hot gas directly into the analyzer.