YOKOGAWA av550g, User Manual

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< 3. Installation >
3-3
IM 11M12D01-01E
3.1.4 Installation of the Dust Filter (K9471UA), Dust Guard Protector (K9471UC),
Probe Protector ZO21R
<Procedures for installation of the dust filter (K9471UA)>
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.
(1) Mount the dust filter assembly by putting it on the end of the detector and screw the assembly
clockwise. Put a hook pin wrench (K9471UX), Φ52 to 55 in diameter, into the hole on the
assembly to fasten or remove it. Apply a heat-resistant coating (see Note 1) to the threads on
the detector. When remounting filter assembly after having once removed it from the detector,
reapply the heat-resistant coating.
Note 1: As the detector is heated to 700 °C, it is recommended to use heat-resistant coating on the threads to prevent seizing up.
Name of the heat-resistant coating material: NEVER SEEZ Nickel Special”.
Ø51
32
10
Carborundum filter (SiC)
Detector
Screw
Increasing of insertion length
Unit : mm
F3-2E.ai
Attach the filter unit to
the tip of the detector
by screwing it clockwise.
Figure 3.2.1 Installation of the dust filter
< Procedures for installation of the dust guard protector (K9471UC)>
The ZR22G detector is shipped with the dust guard protector when the option code / F2 is specified in
case of ordering the detector. The protector should be used when preventing dusts and water drops
from lowering the detector performance is desired.
Screw the protector on the top of the detector so as to cover the top. When attaching or detaching the
protector, perform by hooking holes of its side with a hook pin wrench for Φ52-55 hole (Pin diameter
4.5 mm: P/N K9471UX or the like) or by pass a screwdriver through the holes. When re-attaching the
protector after detaching it, apply the “NEVER SEEZ Nickel Special” to it.