Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 179)

IM 11M13A01-02E 11-8
11.1.4 Replacement of flame arrester assembly
If it takes longer for the analyzer to return to read the concentration of a sample gas
after calibration, the flame arrester may have become clogged. Inspect the flame arrester
and if necessary, clean or replace it.
Set the flame arrester assembly 1 in place using a special pin spanner (with a pin 4.5
mm in diameter: part no. K9471UX or equivalent). If a flame arrester assembly that has
already been replaced once is used again, apply grease (NEVER SEAZE: G7067ZA) to
the threads of the flame arrester assembly.
If the flame arrester assembly is clogged with dust, replace it with new one or wash it.
In case of the ATEX flameproof model (MS Code: ZR22S-A-...) or IECEx flameproof
model (MS Code: ZR22S-D-...), the flame arrester assembly 1 is bonded to the
detector 22 with an ceramic adhesive. To remove the flame arrester assembly 1 , crack
the hardened adhesive on the joint by tapping it with a flat blade screwdriver and a
hammer or appropriate tools. After reattaching the flame arrester assembly 1 , apply a
small amount of ceramic adhesive (P/N G7018ZA), with a diameter not exceeding 10
mm, to the joint part. Be careful not to allow the ceramic adhesive to enter between the
female and the male screws. Before applying, stir the ceramic adhesive thoroughly. The
ceramic adhesive should be stored in a cool, dark place and has a shelf life of 6 months
from the date of shipment.
Flame Arrester Assembly Detector
Apply adhesive here
Flame Arrester Assembly
Detector
F11.5E.EPS
Figure 11.5 Removal of Flame Arrester
11.1.5 Replacement of O-ring
The detector uses three different types of O-rings 13 , 19 , and 20 , two O-rings of each
type.
T11.1.4E.EPS
Part No. Description
K9470BJ Metal ring
K9470ZS O-ring with grease
Two pairs of O-rings
with grease
K9470ZP
7
13
19
20