Brooks Instrument MT3810 - Manual (Page 11)

Installation and Operation Manual
X-VA-MT3810-eng
Part Number: 541B050AAG
December, 2008
Model MT 3810
Section 1 Introduction
1-5
1-5a Microprocessor Transmitter with or without Alarms and Pulse Output
Based on Brooks Smart Meter Manager Technology
Design Features
• A 2-wire, loop-powered device for ease of wiring and installation
• 4-20 mA analog output for flowrate, with Bell-202 modulated HART
communication channel
• User selectable 0% and 100% analog output ranges with optional
smoothing
• Flexible (mix & match) units of measure for flowrates, totals, temperatures,
densities, etc.
• Two flow totalizers: Resettable and inventory totalization
• User configurable, scaleable pulse output for various engineering units
• Comprehensive alarms for both process flow and internal diagnostic checks
• Easily configured and compatible with other plant equipment
• Patented magnetic sensor which is resistant to external magnetic fields
Description
“Smart Inside” best defines the Brooks transmitter with optional alarms and
pulse output for totalization. The transmitter (with or without the alarms and
pulse output) is a compact microprocessor device designed to interface directly
with the Model MT 3810 flowmeter. The microprocessor electronics are based
on the Brooks Smart Meter Manager (SMM
TM ) technology common to other
Brooks flowmeters.
The transmitter is HART-programmable for numerous variables such as flow
rate, totalization, calibration factors, and high-low alarm parameters. It is
programmable with easy-to-use hand held configurators such as the
Emerson
TM HART 275 Communicator. Prior to shipment, commonly used
default values are programmed by Brooks to ensure ease of operation and
quick startup. However, parameters may be reprogrammed by the user if
needed. The 2-wire electronics system is easy to install and inface with other
existing equipment such as process management systems or maintenance
control packages.
In operation the microprocessor transmitter converts the measured process
flow into a 4-20 mA output with HART protocol. The signal originates when
the float magnet inside the metering tube passes a magnetic sensor mounted
on the transmitter. Flow rate information may be viewed locally at the meter
scale or displayed remotely (along with other flow data) as a function of external
support systems through analog/pulse outputs or multiple digital
communications.
In addition to transmitter features, this unit can also be ordered with optional
alarms and pulse output provided by open collector switches. One or two
alarms may be programmed prior to shipment of the unit or at the customer
site with a hand-held communicator.