66
X-VA-MT3809G-MT3810G-eng/541B182AAG/A/2022-10
Brooks Instrument
Installation Manual MT3809G & MT3810G
Section 4 Maintenance
Inductive Alarm Replacement
a. Remove the front cover of the indicator housing, refer to Section
2-5-1.
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 2-6a & 2-6b, 2-7a & 2-7b,
2-8a & 2-8b and 2-9a & 2-9b.
k. Replace the scale and tighten two clamping screws. Make sure that
the alarm switch wires do not interfere with the alarm cam. Insure that
WKHSRLQWHULVDOLJQHGZLWKWKHµ5¶RU]HURPDUN,IQRWUHIHUWR6HFWLRQ
4-3, indicator reference mark (zero) adjustment.
l. Set the alarm position, by loosening the two pointer screws, moving
the point of the desired alarm setting, and tightening the screws.
P&RQQHFWWKH¿HOGZLULQJ
n. Replace the indicator housing cover and secure with four screws.
Transmitter Replacement with Inductive Alarms
7KHWUDQVPLWWHULVDVHOIFRQWDLQHGXQLWPDWFKHGVSHFL¿FDOO\WRWKH
DVVRFLDWHGÀRZPHWHU,IWKHUHLVDQHHGWRUHSODFHSOHDVHFRQWDFW
your nearest authorized Brooks service representative. However,
the inductive alarms may be replaced according to the procedure in
Section 4.6
Digital Display Replacement
If there is a need to replace, please contact your nearest authorized
Brooks service representative.
