Brooks Instrument MT3810 - Manual (Page 56)

4-4
Model MT 3810
Installation and Operation Manual
X-VA-MT3810-eng
Part Number: 541B050AAG
December, 2008
Section 4 Maintenance
f. Sizes 15 and 16 (3" and 4") Flanged Liquid or Gas Service (Size 15 only)
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. Loosen the float assembly by fixating two pliers one on each end of the
float assembly inlet guide cartridge (#8). Turn to loosen with the help of
a pin wrench.
3. Carefully remove the complete float assembly (#2) and conical taper
(#7) as well as the spacer bushing (#10, Size 16 only) out the inlet/
bottom of the meter.
4. Reassemble by inserting the float assembly inside the conical taper (as
well as the spacer bushing, Size 16 only). Then insert the complete
float assembly into the bottom of the meter. Replace the float assembly
inlet guide cartridge and tighten the float assembly into place.
2. NPT Connection
a. Size 7 (1/2") NPT Liquid or Gas Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. Unscrew the inlet fitting (#4) at the bottom of the meter.
3. Push the entire float assembly slowly downward and out of the meter
inlet by pushing from the top with a round bar stock (3/4” or 19 mm
diameter).
4. Remove the float snap-ring and clean individual float assembly parts.
5. Reassemble the meter by reassembling the float assembly and
inserting it into the bottom of the meter. Reinstall and secure the inlet
fitting (#4).
b. Sizes 8 (1/2"), 10 (1"), 12 (1 1/2"), 13 (2") NPT Liquid Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. Unscrew the inlet fitting (#4) at the bottom of the meter.
3. Loosen the float assembly with two screwdrivers one on each end of
the meter and turn to loosen the inlet and outlet screws (#2). Remove
inlet screw (#2) at the bottom of the meter.
4. Remove the guide vane (#3) at the bottom of the meter and gently push
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).