Brooks Instrument MT3809E - Manual (Page 56)

4-2
Section 4 Maintenance
Models MT 3809 and 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
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 MT 3809 and
MT 3819 flowmeters. However should it become necessary to replace,
adjust or remove components of the flowmeter, specific recommendations
must be followed.
4-2a Meter Float Replacement and Cleaning (MT 3809)
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, 4-2 and
4-3 for referenced part numbers (#) appearing in parenthesis.
Pressure test the meter before returning it to service. Hydrostatic
pressure testing should be performed only by qualified personnel
or serious personal injury and/or damage to the equipment can
result.
WARNING
1. Flanged Connection
a. Size 7 (1/2") Flanged Liquid or Gas Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. With a small screwdriver, remove the spiral retaining ring (#1) from the
meter inlet.
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
(#1) in the meter inlet.
b. Size 8 (1/2") Flanged Liquid Service
1. Remove the meter from the process line and lay the meter horizontal
on a table.
2. With small screwdriver remove the spiral retaining ring (#1) from the