Brooks Instrument MT3809G - Manual (Page 48)

4-2
Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
September, 2013
Models MT3809G & MT3810G
Section 4 Maintenance
If this equipment is not properly serviced, serious personal injury
and/or damage to the equipment can result from potentially high
operating pressures. Process line pressure should be removed
prior to servicing.
WARNING
There is no routine maintenance required for the Models MT3809 and
MT3810 flowmeters. However should it become necessary to replace,
adjust or remove components of the flowmeter, specific recommendations
must be followed.
4-2 Meter Float Replacement and Cleaning (MT3809 & MT3810)
Float replacement procedures are dependent on the meter size,
connection type and fluid (gas vs. liquid) application. Please refer to the
appropriate section below for instructions along with Figures 4-1 thru 4-4.
1. Flanged Connection
a. Size 7 (½") flanged, liquid or gas service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Remove the gasket support ring. A bearing puller of the correct size is
recommended to remove the gasket support ring.
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 to clean individual float assembly parts.
5. Reassemble the meter by reassembling the float assembly and inserting
it into the bottom of the meter. Replace the spiral retaining ring in the meter
inlet.
b. Size 8 (½") flanged, liquid service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Remove the gasket support ring. A bearing puller of the correct size is
recommended to remove the gasket support ring
3. Loosen the float assembly with two screwdrivers one on each end of the
meter and turn to loosen the inlet and outlet screws. Remove inlet screw at
the bottom of the meter.
4. Remove the guide vane 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 and secure the float assembly by tightening the
inlet and outlet screws. Replace the spiral retaining ring in the meter inlet.