Emerson Process Management 3000 - Manual (Page 116)

Instruction Manual
Appendix A Rev. 3.8
July 2002
A-18 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
World Class 3000
OPTIONAL CERAMIC
DIFFUSION ELEMENT
VEE
DEFLECTOR
HUB
PIN
WRENCH
SETSCREW
RETAINER
CEMENT
PORT
CEMENT
FILLET
21240026
Figure A-19. Removal of Optional Diffusor
and Vee Deflector
PROBE TUBE
(NOT INCLUDED
IN KIT)
SOCKET HEAD
CAP SCREWS
CORRUGATED
SEAL
CELL AND
FLANGE
ASSEMBLY
CALIBRATION GAS
PASSAGE
21240009
Figure A-20. Cell Replacement Kit
e. If contact assembly is damaged, replace
contact and thermocouple according to
paragraph A-13, Replacement of Contact
and Thermocouple Assembly.
f. Remove and discard corrugated seal. Clean
mating faces of probe tube and retainer.
Remove burrs and raised surfaces with
block of wood and crocus cloth. Clean
threads on retainer and hub.
g. Rub a small amount of anti-seize on both
sides of new corrugated seal.
h. Assemble cell and flange assembly, corru-
gated seal, and probe tube. Make sure the
calibration tube lines up with the calibration
gas passage in each component. Apply a
small amount of anti-seize compound to
screw threads and use screws to secure
assembly. Torque to 55 in-lbs (4 N
•
m).
i. Apply anti-seize compound to threads of
cell assembly, hub, and setscrews. Reinstall
hub on cell assembly. Using pin spanner
wrenches, torque to 10 ft-lbs (14 N
•
m). If
applicable, reinstall vee deflector, orienting
apex toward gas flow. Secure with
setscrews and anti-seize compound.
Torque to 25 in-lbs (2.8 N
•
m).
j. On systems equipped with an abrasive
shield, install dust seal gaskets, with joints
180
o apart.
k. Reinstall probe and gasket on stack flange.
If there is an abrasive shield in the stack,
make sure dust seal gaskets are in place as
they enter 15
o reducing cone.
l. Turn power on to electronics and monitor
thermocouple output. It should stabilize at
29.3 ±0.2 mV. Set reference air flow at 2 scfh
(56.6 L/hr). After probe stabilizes, calibrate
probe per Instruction Bulletin applicable to
your electronics package. If new components
have been installed, repeat calibration after
24 hours of operation.
A-12 OPTIONAL CERAMIC DIFFUSION
ELEMENT REPLACEMENT
a. General
The diffusion element protects the cell from
particles in process gases. It does not nor-
mally need to be replaced because the vee
deflector protects it from particulate erosion.
In severe environments the filter may be
broken or subject to excessive erosion. Ex-
amine the diffusion element whenever re-
moving the probe for any purpose. Replace
if damaged.