YOKOGAWA EXAxt ZR22G, User Manual, Page: 53 / 211

<3. Installation>
3-2
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
(3) The detector probe should be mounted at right angles to the sample gas flow or the probe
tip should point downstream.
100 mm
100 mm
F3-1E.ai
(vertical)
Bounds of the probe
insertion hole location
Flange matches
the detector size
(horizontal)
Note
Type Outside diameter of detector
Standard 50.8 mm in diameter (Note)
With dust filter 51 mm in diameter (Note)
With probe protector 60.5 mm in diameter (Note)
With dust protector 80 mm in diameter or longer (Note)
Four-hole flange Eight-hole flange
*1
*1
JIS flange
(the detector with
dust protector)
(Note) When using the detector with pressure compensation, ensure that the flange gasket does not block the reference gas outlet on
the detector flange. If the flange gasket blocks the outlet, the detector cannot perform pressure compensation.
Where necessary, make a notch in the flange gasket. Confirm the outside dimensions of the detector in Section 2.2 before
installation.
When using the detector with ZH21B dust protector the diameter of the hole should be 80mm or larger.
Figure 3.1 Illustrates an example of the probe insertion hole.
3.1.2 Installation of the Detector
CAUTION
• The cell (sensor) at the tip of the detector is made of ceramic (zirconia). Do not drop the
detector, as impact will damage it.
• A gasket should be used between the flanges to prevent gas leakage. The gasket material
should be heatproof and corrosion-proof, suited to the characteristics of the sample gas.
The following should be taken into consideration when mounting the general use detector:
<General use detector>
(1) Make sure that the cell mounting screws (four bolts) at the tip of the detector are not loose.
If a dust filter (see Section 2.7.1) is used, make sure it is properly attached to the detector.
Refer to Section 3.1.3 for installation of the dust filter.
(2) Where the detector is mounted horizontally, the calibration gas inlet and the reference gas
inlet should face downward.
3.1.3 Installation of the Dust Filter (K9471UA), Dust Guard
Protector (K9471UC), Probe Protector ZO21R
CAUTION
• The dust filter is used to protect the Zirconia sensor from corrosive dust or a high
concentration of dust such as in utility boilers and cement kilns. If a filter is used in
combustion systems other than these, it may have adverse effects such as response delay.
These combustion conditions should be examined carefully before using a filter.
• The dust filter requires gas flow of 1 m/sec or faster at the front surface of the filter.
When you specify option code /F1, the detector is shipped with the dust filter mounted.
Follow this procedure replace the filter on the detector . It is recommended that you read Chapter
11 prior to filter mounting, for it is necessary to be familiar with the detector’s construction,
especially the sensor assembly.