<4. Piping>
4-2
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
• It is recommended to use ZH21B dust protector to protect the probe output from dust
agitation (i.e., to prevent combustible materials from entering the probe cell) where humidity
measurements are made under dusty or combustible, such as paper dust, environment.
•If a high temperature detector is used and no piping can be installed for the reference gas,
place piping in the exhaust hole for the sample gas on the high temperature probe adapter
so that the sample gas is carried away from the vicinity of the detector (see Section 4.1.4,
“Figure 4.6 Exhaust pipe”).
•If a high temperature detector is used and the sample gas pressure is negative, connect
an ejector assembly to the sample gas exhaust hole of the high temperature probe adapter
(see Section 4.1.4,
“Figure 4.3 Mounting the ejector assembly”).
•If a high temperature detector is used and the pressure of the sample gas is 0.49 kPa or
higher, it is recommended that a needle valve (throttle) be used in the sample gas exhaust
of the high temperature probe adapter (see Section 4.1.4,
“Figure 4.4 Mounting the
).
CAUTION
This is for lowering the sample gas temperature below 700°C. If the gas temperature is high and
before it reaches the detector.
On the other hand, if the sample gas temperature is lowered too much, condensation may be
produced in the High Temperature Probe Adapter. During wintertime, it is recommended that the
High Temperature Probe Adapter be protected with an insulating material to avoid condensation
forming (see Section 4.1.4,
“Figure 4.5 Preventing to condensation”).
For the usage of the High Temperature Probe Adapter, refer to Section
“3.2.1 Usage of the
High Temperature Probe Adapter (ZO21P-H)”.
4.1.1 Parts Required for Piping in System 1
Check that the parts listed in Table 4.1 are ready.
Table 4.1
Detector Piping location Parts Name Note
General use
detector
Calibration gas inlet Stop valve Recommended by YOKOGAWA
(L9852CB or G7016XH)
Nipple * Rc 1/4 or 1/4 NPT General parts
Joint for tube connection Rc 1/4 (1/4 NPT)
for a Ø6 x Ø4 mm soft tube
General parts
Reference gas inlet (sealed up)
Connection to the Reference Gas Inlet”)
High temperature
detector
(0.15 m)
Calibration gas inlet Stop valve Recommended by YOKOGAWA
(L9852CB or G7016XH)
Nipple * Rc 1/4 or 1/4 NPT General parts
Joint for tube connection Rc 1/4 (1/4 NPT) for a Ø6 x Ø4 mm soft tube
Reference gas inlet (sealed up)
“4.1.3
Connection to the Reference Gas Inlet”)
Sample gas outlet Ejector assembly * Recommended by YOKOGAWA
(E7046EC or E7046EN)
T-shaped joint of the
same diameter *
R1/4 or 1/4 NPT General parts
Needle valve * Rc1/4 or 1/4 NPT General parts
Nipple of other diameter
*
R 1/2 to R 1/4 or
R 1/2 to 1/4 NPT
General parts
General parts can be found on the local market.
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