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Foundry Products --> Pumping
Systems --> DMF MASS-TER Flow Pumping System Foundry Products:
MF Mass Flow
Resin Control System
General
Description
 The
MF System features Straight Tube Coriolis Mass Flow
Meters that are the most reliable meter in the
industry. The straight tube
design operates undisturbed in hostile, vibration
prone applications and has proven itself well suited
for operation in a foundry environment.
The
liquid portion of the MF is housed in a large,
freestanding enclosure and is comprised of DC
powered, magnetically coupled gear pumps in
combination with the Coriolis Meters and
air-actuated, three-way diverter valves.
The pump runs in a recirculating format that
provides constant chemical flow through the flow
meters. During idle mixer time,
the chemical flow is sent back to the storage
containers. When required, the
three-way valves instantly divert the chemicals to
the mixing chamber, and then divert back to storage
at the end of the mixing cycle.
The
control portion of the standard MF is housed in a
separate NEMA enclosure and consists of PID Process
Controllers coupled with PWM DC Motor Control
Boards. Based on flow signals
from the Coriolis Meters, each PID controller
regulates pump speed to maintain the desired
setpoint. Any changes in liquid
flow due to changes in viscosity, line restrictions,
etc., are instantly compensated for. If,
for some reason, the system cannot maintain the
desired flow, low/high flow alarms indicate the
problem to the operator.
Mass
Flow Meters
The
Coriolis Mass Flow Meters incorporate a number of
innovative design features such as quiet mode
oscillation, center balanced design, and unique
straight tube design. These
design features focus on maximizing a reliability
and durability and minimizing vulnerability to
measurement noise. These meters
use thicker tube walls to eliminate mechanical
fatigue due to sensor wear and stress due to
vibration. All input and output
signals are scanned and updated ten times per
second.
These
meters automatically adjust for material viscosity
changes and minor line restrictions.
Standard
Mass Flow Meter Specifications
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Construction
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Wetted
Parts 904L S.S. or Hastalloy C-22
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Accuracy
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±0.2%
of reading, ±.005% of full
scale
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Repeatability
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0.1%
or Better
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Operating
Temperature
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-50°F
to +392°F
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Transmitter
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Microprocessor
based digital electronics. Backlit
two-line LCD display for auto zero, mass
flow rate, Resettable and non-resettable
totalizers, process fluid temperature,
density, tube frequency, and software
diagnostics. Pushbutton
engineering units, flow range, and alarm
outputs.
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Power
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115/130
VAC; 50/60-HZ; 18-36 VDC; 10 Watts
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Outputs
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Two
4-20 MADC outputs fully programmable
Pulse/Frequency,
Active/Passive Selectable
Fault
Signaling
SMART
Technology Communication, RS 485 Interface
Two
Relay Outputs
User
Programmable
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Transmitter
Housing
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NEMA
4x – Epoxy Coated Die-Cast Aluminum
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Power
Supply
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85
to 260-VAC (45 to 65-HZ)
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Sensor
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FM
Approved, Non-incentive
Class
1, Div. 2, Groups A-D
Dust
Ignition Proof, Class II
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Resin
Pumps
The two standard resin pumps are Tuthill™ brand
external micro-gear design, and are magnetically
coupled to ½-HP 90VDC permag motors. Magnetic
coupling eliminates shaft seal and all associated
maintenance issue with pump leakage.
Temperature
Biasing
As
a part of our standard Mass Flow PLC Control System,
for systems set up for three part phenolic urethane,
furan, or other coreactant controlled resin system,
temperature biasing is standard. In addition
to the normal PID control of pump speeds based on
liquid viscosity changes, resin temperature, and the
like, catalyst or coreactant speed is also varied
based on sand temperature. For installations
requiring a true fixed strip time this feature is
invaluable. Temperature curve fitting
parameters are user adjustable so that the system
can be fine tuned to the exact chemical system being
run. For best results, the thermocouple for
sand temperature measurement should be located as
close to the mixer inlet as is feasible in order to
prevent lagging related problems.
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