YOKOGAWA EXAxt ZR22G, User Manual, Page: 68 / 211

<4. Piping>
4-3
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
4.1.2 Connection to the Calibration Gas Inlet
When carrying out calibration, connect the piping (6(O.D) ~4(I.D.) mm tube) from the standard
gas unit to the calibration gas inlet of the detector. First, mount a stop valve (of a quality specified
by YOKOGAWA) on a nipple (found on the local market) as illustrated in Figure 4.2, and mount a
joint (also found on the local market) at the stop valve tip. (The stop valve may be mounted on the
detector prior to shipping the detector.)
Note: Mount the stop valve close to the detector.
F4-2E.ai
Nipple Stop valve
Tube connection joint
Figure 4.2 Connection to the calibration gas inlet
4.1.3 Connection to the Reference Gas Inlet
• Normally, no piping is required for the reference gas inlet when the equipment uses natural
convection for the reference gas (models ZR22G-

-

-

-C). Leave the plug as it is . If the
air around the detector is polluted and the necessary oxygen concentration (21 vol%O
2
)
cannot be obtained, prepare piping the same as which described in Section 4.2, System 2.
• When the equipment uses instrument air for the reference gas, piping is required as
described in Section 4.2, System 2 (models ZR22G-

-

-

-E or P).
4.1.4 Piping to the High Temperature Probe Adapter
• The sample gas should be at a temperature below 700 ° C before reaching the detector
sensor. If the gas is under negative pressure, it should be fed to the detector by suction.
• For usage of the probe adapter when using high temperature detector, refer to Section 3.2.1.
• If the sample gas is under negative pressure, connect the ejector assembly (E7046EC/
E7046EN) as illustrated in Figure 4.3. Mount the pressure gauge as close as possible to
the ejector assembly. However, if the ambient temperature is too high, mount the gauge in a
location with a temperature below 40 ° C.
Ejector assembly for
high temperature use
Adapter for
high temperature probe
Detector
F4-3E.ai
Figure 4.3 Mounting the ejector assembly
If the temperature of the sample gas exceeds the specified value and its pressure exceeds 0.49
kPa, the sample gas temperature may not be below 700°C at the detector.