Brooks Instrument MT3809G - Manual (Page 54)

4-8
Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
September, 2013
Models MT3809G & MT3810G
Section 4 Maintenance
4-3 Meter Float Replacement and Cleaning (MT3809 ETFE Option) (Refer to Figure 4-5)
Flanged connections, all sizes, liquid or gas
a. Remove the meter from the process line and lay the meter horizontal on
a table.
b. With a screwdriver, carefully loosen the inlet and outlet inserts.
c. Continue to pull until the inlet and outlet inserts are removed from the
meter.
d. Remove the float and conical taper from the meter.
e. Reassemble by reinserting the float and tapered insert. And then gently
push the inlet and outlet inserts into the flanges. Sizes 10 (1"), 12 (1½")
and 13 (2") meters, be careful to line up the top of the float assembly shaft
with the outlet insert to ensure proper fit.
4-4 Meter Indicator Reference Mark (zero) Adjustment
This adjustment is performed with no process flow with the float resting on
the guide vane or the inlet end fitting.
a. Completely stop fluid flow through the indicator.
b. Remove the four screws securing the indicator housing window and
remove the gasket and cover.
c. Turn the slotted screw on the bottom of the point until the pointer is in
line with the reference (zero) mark on the scale.
d. Replace the indicator housing cover with gasket and secure with the four
screws.
4-5 Transmitter Replacement with or without Alarms and Pulse Output
All transmitters are self contained units matched specifically to the
associated flowmeter. If there is a need to replace, please contact your
nearest authorized Brooks service representative.
4-6 Inductive Alarm Replacement
a. Remove the front cover of the indicator housing by removing the three
screws securing it.
b. The wires from the alarm switch(es) are wired into the alarm terminal
connector.
c. Loosen the two screws securing the scale, with the alarm switches
attached, and remove the scale.
d. Remove the two screws securing the wire cover.
e. Turn the wire cover over to expose the alarm terminal blocks.
f. Remove the wires from the terminal blocks
g. Turn the scale over and locate the screw centered in the green alarm
switch. Remove the screw being careful not to lose the nut on the outside
of the alarm set bracket. Remove the alarm switch from support.
h. Place the switch on the bracket with the open end facing towards the
center of the scale plate and the wires facing away from the scale plate.
i. Place the switch screw through the opening in the switch, and the
support bracket. Use the nut to secure the screw and tighten.
j. Connect the alarm switch wires to the terminal block. Refer to Alarm
Wiring Diagrams figures 1-5A & B, 1-6A & B, 1-7A & B and 1-8A & B.