Instruction manual

11.0 INSPECTION and MAINTENANCE SM425 INSTRUCTION MANUAL
insulator are heater wires and the single-core wire is CELL+. One of the two core-wires with
semitransparent silicone tubing is TC+ and the other is TC-.
11.1.3.6 Install the Cell
Install the Filter holder, the U-shaped Pipe, the Filter, and the Cell according to Section 3.1.3 “Part
assembly procedure of the sensor assembly”. The replacement heater strut assembly is shipped with a
new CONTACT.
11.1.4 Replacement of Optional Dust Filter Assembly
Refer to Figure 11-4 Exploded View of Detector with Pressure Compensation”. Install the dust filter
assembly (1) using a special pin spanner (with a pin 4.5 mm in diameter: part no. K9471UX or
equivalent). Ensure threads of the dust filter assembly are coated with grease (NEVER-SEEZ: G7067ZA).
11.1.5 Replacement O-rings
Table 11-1 lists the part numbers for replacement O-rings. Refer to Figure 11-4 for locations of these
parts in the detector. All detectors require one set of each part number. The pressure compenstated type
detector requires two additional (14) O-rings. The O-ring set (21) and (22) is used to seal the reference
and calibration gas lines. These require periodic replacement.
Table 11-1 O-ring part numbers
Part No. Description
(7) K9470BJ Metal O-ring
(14) K9470ZS
Metal O-ring
With grease
(21)
(22)
K9470ZP
Two pairs of O-
rings with grease
11.1.6 Cleaning the High-temperature Probe Adapter
• Do NOT subject the probe of the High-temperature Probe Adapter (ZO21P-H-A) to strong mechanical
vibration or mechanical shock. This probe uses silicon carbide (SiC) which may become damaged if it is
subjected to strong mechanical or thermal shock.
A probe adapter is used to direct process gas to the high-temperature detector. Sufficient gas flow
through this adapter must be maintained to ensure accurate measurements. The adapter must be
periodically inspected and cleaned if particulate buildup or clogging is found.
Remove particulate matter from probe with air or by cleaning with a metal rod. Remove the associated
auxiliary ejector or needle valve from the high-temperature probe adapter and clean it with air or rinse in
water.
42500001 REV A 181