Manual

4-10
Section 4 Maintenance
Models MT 3809 and 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
i. Set the alarm position, by loosening the two pointer screws, moving
the point of the desired alarm setting, and tightening the screws.
j. Connect the field wiring.
k. Replace the indicator housing cover and secure with four screws.
4-6 SMM 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 it, please contact your
nearest authorized Brooks Service Representative. However, the inductive
alarms may be replaced according to the procedure in Section 4-5.
4-7 Monitoring the Integrity of the SMM Electronics - Diagnostic Alarms
As part of its normal operations, the SMM 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.
TRADEMARKS
AMS ................. Emerson Process Management Grp. of Companies
Brooks ........................................................... Brooks Instrument, LLC
Emerson ........................................................... Emerson Electric Co.
Emerson Access Management ........................ Emerson Electric Co.
HART ......................................... HART Communications Foundation
Smart Meter Manager ....................................... Brooks Instrument, LLC
SMM ............................................................. Brooks Instrument, LLC
Teflon ................................................ E.I. DuPont de Nemours & Co.
Viton ............................................... DuPont Performance Elastomers