Brooks Instrument MT3809G - Manual (Page 56)

4-10
Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
September, 2013
Models MT3809G & MT3810G
Section 4 Maintenance
4-7 Transmitter Replacement with Inductive Alarms
The transmitter is a self contained unit matched specifically to the
associated flowmeter. If there is a need to replace, please contact your
nearest authorized Brooks service representative. However, the inductive
alarms may be replaced according to the procedure in Section 4.6
4-8 Monitoring the Integrity of the Transmitter Electronics-Diagnostic Alarms
As part of its normal operations, the transmitter continuously monitors its
own internal health. Automatic diagnostics can trigger alarms indicating
poor communications, memory integrity, or sensor problems. The user can
define whether these malfunctions are serious and instruct that a 4-20 mA
analog- signal be sent automatically to a receiving devices such as a DCS
or PLC system.
a. Power failure alarm
The power failure alarm will occur when the current-loop is broken and
then restored. In this case, the transmitter will raise the power-fail alarm to
notify the user that there was a gap in data collection. The 4-20 mA loop
provides all internal power for the SMM electronics. However, if power is
lost, the setup parameters are internally stored in nonvolatile memory
(lithium battery) and maintained in the event that external power is
disconnected.
b. Database-initialization alarm will occur when the transmitter powers
up and finds that the internal parameter database was not saved properly
and must return parameters to the inherent defaults.
c. High internal temperature alarm
Should the electronics unit exceed functional limits (70°C), this information
will be indicated.
4-9 Digital Display Replacement
The digital display is a self contained unit matched specifically to the
associated flowmeter. If there is a need to replace, please contact your
nearest authorized Brooks service representative.