< 4. Piping >
4-2
IM 11M12D01-01E
CAUTION
This is to lower the temperature of a sample gas below 700°C. When both the temperature and the
pressure of a sample gas are high, the temperature of the sample gas may not fall below 700°C
before the gas reaches the detector. On the other hand, the temperature of a sample gas may drop
too much and thus condensation develops in the high temperature probe adapter. During wintertime,
it is recommended that the high temperature probe adapter be protected with an insulating material to
prevent condensation.
• When a high temperature detector is used and blow back is required to eliminate dust
accumulating in the probe of the high temperature probe adapter, air supply piping for purging
should be installed.
CAUTION
If a sample gas contains much dust (e.g., in recovery boilers or cement kilns), the probe is more likely
to become clogged. To eliminate this dust accumulation using air pressure, piping is generally installed
from an air source only when cleaning is performed. Some cases, however, may need a permanent
installation of the blow back piping. See Subsection 4.1.5 for the installation of blow back piping.
4.1.1 Parts Required for Piping in a System Using Flow Setting Units for Manual
Calibration
Referring to Table 4.1, check that the parts required for your system are ready.
Table 4.1 Parts Required for Piping in a System Using Flow Setting Units for Manual
Calibration
Detector
Piping Location
Parts Name
Remark
General-purpose
detector
Calibration gas
inlet
Stop valve or
Check valve
Yokogawa recommended: L9852CB/G7016XH or
K9292DN/K9292DS
* Nipple
R1/4 or 1/4 NPT (male-male)
General parts
Tube fitting
R1/4 (or 1/4 NPT) for a Ø6
Ø4
mm soft tube
General parts
Reference gas
inlet
Air set
Yokogawa recommended: G7003XF/K9473XK or
G7004XF/K9473XG
Connection fitting R1/4 or 1/4 NPT (male)
General parts
High
temperature
detector (0.15 m)
Calibration gas
inlet
Stop valve or
Check valve
Yokogawa recommended: L9852CB/G7016XH or
K9292DN/K9292DS
* Nipple
R1/4 or 1/4 NPT (male-male)
General parts
Tube fitting
R1/4 (or 1/4 NPT) for a Ø6
Ø4
mm soft tube
General parts
Reference gas
inlet
Air set
Yokogawa recommended: G7003XF/K9473XK or
G7004XF/K9473XG
Connection fitting R1/4 or 1/4 NPT (male)
General parts
Sample gas
outlet
* Auxiliary ejector
assembly
Yokogawa recommended: E7046EC or E7046EN
* Equal tee,
connection fitting
Rc1/4 or 1/4 NPT (female)
General parts
* Needle valve
Rc1/4 or 1/4 NPT
General parts
* Reducing nipple R1/2 to R1/4 or R1/2 to 1/4 NPT
General parts
Note: Parts marked with an asterisk (*) are used when required. General parts can be found on the local market.
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