Instruction manual

SM425 INSTRUCTION MANUAL 3.0 INSTALLATION
3.1.4 Installation of the Dust Filter ( Part No 96751017), etc
- 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 concrete 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 (96751017).
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 Section 0 prior to filter
mounting. It is necessary to be familiar with the detector’s construction, especially the sensor assembly.
1. Mount the dust filter assembly by placing it on the end of the detector and screw the assembly
clockwise. Use a hook pin wrench (K9471UX), Ø52 to 55 in diameter on the assembly to fasten
or remove it.
Apply a heat-resistant coating to the threads during assembly or any subsequent reassembly (see Note
below).
Note: The detector is heated to 700°C and requires heat-resistant coating on the threads to prevent
seizing up. The recommended heat-resistant coating material is “NEVER SEIZE NICKEL SPECIAL”.
Figure 3-2 Installation of the dust filter
< Procedures for installing the dust guard protector (K9471UC)>
The SM425P detector is shipped with the dust guard protector when the option code “/F2” is specified.
The protector is a particulate and moisture filter for the detector. The protector mounts on top of the
detector. When attaching or detaching the protector, use a hook pin wrench for a Ø52-55 hole (Pin
44 42500001 REV A