Brooks Instrument MT3809E - Manual (Page 59)

4-5
Section 4 Maintenance
Models MT 3809 and 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
the float assembly up and out the top/outlet side.
5. Reassemble by inserting the float assembly into the top of the meter.
Replace the guide vane (#3) and secure the float assembly by
tightening the inlet and outlet screws (#2). Reinstall and secure the inlet
fitting (#4).
c. Size 8 (1/2”) NPT Gas Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. Unscrew the outlet fitting (#4) at the top/outlet of the meter and remove
the gas damper.
3. Unscrew the inlet/bottom fitting (#4) and slowly remove the float
assembly.
4. To reassemble the meter, insert the float assembly into the inlet/bottom
of the meter. Secure the inlet/bottom fitting (#4). Replace the gas
damper and secure the outlet/top fitting (#4).
d. Sizes 10 (1"), 12 (1 1/2"), 13 (2") NPT Gas Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. Remove the top/outlet screw (#5).
3. Loosen the float assembly by holding the damper in place with a pin
(1/8” diameter) in the top while loosening the inlet/bottom fitting. Gently
push the float assembly out through the inlet/bottom.
4. To clean the gas damper, unscrew the cylinder head (#6). Then remove
the bolt (#7) and take out the small piston carefully so as to not damage
the critical surfaces.
5. Reassemble the meter by inserting the float assembly with damper into
the inlet/bottom of the meter. Secure the inlet/bottom screw by holding