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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Resource Center |
| Video |
Palmer No-Bake Equipment Line |
| Article |
Understanding Mixer Pumping Systems |
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Construction
|
Wetted Parts 904L S.S.
or Hastalloy C-22
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Accuracy
|
±0.2%
of reading, ±.005% of full scale
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Repeatability
|
0.1% or Better
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Operating Temperature
|
-50°F to
+392°F
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Transmitter
|
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
|
115/130 VAC; 50/60-HZ;
18-36 VDC; 10 Watts
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Outputs
|
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
|
NEMA 4x – Epoxy Coated
Die-Cast Aluminum
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Power Supply
|
85 to 260-VAC (45 to
65-HZ)
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Sensor
|
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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