Siemens Milltronics MILLFLO User manual

MILLFLO
milltronics
Instruction Manual September 2003

© Siemens MilltronicsProcessInstruments Inc. 2003
Safety Guidelines
Warning notices must be observed to ensure personal safety as well as that of others, and to
protect the product and the connected equipment. These warning notices are accompanied
by a clarification of the level of caution to be observed.
Qualified Personnel
This device/system may only be set up and operated in conjunction with this manual.
Qualified personnel are only authorized to install and operate this equipment in accordance
with established safety practices and standards.
Warning: This product can only function properly and safely if it is correctly transported,
stored, installed, set up, operated, and maintained.
Note: Always use product in accordance with specifications.
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Technical data subject to change.
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Table of Contents
Milltronics Millflo Solids Flowmeter ..............................................................................1
The Manual ..........................................................................................................................1
Specifications ......................................................................................................................2
Operation ..............................................................................................................................4
Components ....................................................................................................................................4
Horizontal Sensing Plate .............................................................................................................4
Negative Displacement ...............................................................................................................5
Installation ...........................................................................................................................6
Preparation .....................................................................................................................................6
Welding ............................................................................................................................................6
Load Cell Handling ........................................................................................................................6
Disassembly ....................................................................................................................................7
Installation of Shipping Stop ......................................................................................................7
Installation .......................................................................................................................................8
Millflo Outline and Dimensions ..................................................................................................9
Millflo Wiring ................................................................................................................................10
Calibration .....................................................................................................................................11
Applications .......................................................................................................................13
Material Feed......................................................................................................................................... 13
Flowmeter In-Feed Chutes ................................................................................................................. 15
Maintenance ......................................................................................................................18
Periodic Recalibration ................................................................................................................18
Checks ............................................................................................................................................18
Spare Parts ...................................................................................................................................18

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7ML19985CS01 Milltronics Millflo – INSTRUCTION MANUAL Page 1
Milltronics Millflo Solids Flowmeter
The Milltronics Millflo solids flowmeter is a low to medium-capacity flowmeter for
various product sizes, densities, and fluidities in restricted spaces. This low-cost compact
unit improves processing, increases operating efficiency, and helps provide significant
cost savings.
Operating with a microprocessor-based integrator package, the Millflo provides a display
of flowrate, totalized flow, and alarms. Outputs are 0/4 to 20 mA proportional to rate and
open collector output for remote totalization.
Dry bulk solids enter the flowguide producing a mechanical deflections as they strike the
flowmeter sensing plate before continuing through the process unhindered. A strain
gauge loadcell converts the horizontal force of the deflection into an electrical signal. The
integrator processes this into a display of flowrate and integrated total weight. The
process is immune to the effect of product buildup as only horizontal force is measured.
The Millflo features easy installation into standard pipe sizes, simple operation, and fast
and accurate flow response.
The Millflo is an accurate and repeatable force sensor and its performance depends on
the consistency of the material flow into the flowmeter and the quality of the installation.
The Manual
This manual covers the installation, operation, and maintenance of the Milltronics Millflo
solids flowmeter.
Please refer to this manual for proper installation and operation of any component of the
system to which the Millflo is applied. Adhering to the installation and operating
procedures will ensure a quick and trouble free installation and allows for the maximum
accuracy and reliability of your system. Because the Millflo is used in conjunction with an
integrator, refer to the integrator’s manual also.
If you have any questions, comments, or suggestions about the manual’s contents, please
email us at [e-mail].
For the complete library of Siemens Milltronics manuals,
go to www.siemens-milltronics.com.

Page 2 Milltronics Millflo – INSTRUCTION MANUAL 7ML19985CS01
Specifications
Nominal Sizes
• 100 mm (4"), 150 mm (6"), 200 mm (8"), 250 mm (10"), 300 mm (12")
Flow Rate
• 1 t/h to 230 t/h (1 STPH to 250 STPH) dependent upon range (see page 3) and product
bulk density
Product
• fine powder to 13 mm (1/2 inch) (see page 3)
Operating Temperature
• -40 to 65 °C (-40 to 150 °F)
Repeatability
•"0.2%
Accuracy
•"1% of full scale
Construction
• assembly:
• all welded housing and flowguide
•material:
• mild steel, painted
• optional: 304 (1.4301) or 316 (1.4404) stainless steel
• gasketing:
• silicone rubber
• sensing plate:
• 304 (1.4301) stainless steel
•optional:
• 316 (1.4404) stainless steel
• wear resistant coatings
• low friction coating
Load Cell
• stainless steel parallelogram
•temperature:
• -40 to 85 °C (-40 to 185 °F) maximum range
• 0 to 65 °C (32 to 150 °F) internally compensated
•output:
• 2 mV / V excitation at rated load cell capacity
Approvals
•CE
Weight
• see page 3

7ML19985CS01 Milltronics Millflo – INSTRUCTION MANUAL Page 3
Flowmeter Range
• the following ranges and load cell sizes have been specified
Maximum flowrates are based on material densities of 1.6 t /m3(100 lb./ft3).
Size (inlet) Min. Flow Max. Flow Particle
Size Load Cell Size Weight
4" 0 - 1 STPH
0 - 1 t/h
0 - 15 STPH
0 - 14 t/h 6 mm (1/4”) 2 or 5 lb. 20 kg (45 lb.)
6" 0 - 4.4 STPH
0 - 4t/h
0 - 38 STPH
0 - 35t/h 10 mm (3/8”) 5 or 10 lb. 32 kg (70 lb.)
8" 0 - 20 STPH
0 - 18 t/h
0 - 88 STPH
0 - 80 t/h 10 mm (3/8”) 10 or 20 lb. 90 kg (200 lb.)
10" 0 - 50 STPH
0 - 45 t/h
0 - 14 STPH
0 - 13 t/h 13 mm (1/2”) 20 or 50 lb. 113 kg (250 lb.)
12" 0 - 100 STPH
0 - 90 t/h
0 - 250 STPH
0 - 230 t/h 13 mm (1/2”) 100 lb. 136 kg (300 lb.)

Page 4 Milltronics Millflo – INSTRUCTION MANUAL 7ML19985CS01
Operation
Components
Horizontal Sensing Plate
The Millflo reacts to the horizontal component of force
created by the impact of material on the sensing
plate. The Millflo consists of two physical
components:
• the housing which includes the flowguide and
the outlet. It supports the sensing assembly
and guides the material flow.
• the sensing assembly, which includes the
sensing plate and the load cell.
material
flowguide
outlet
sensing
plate
load cell
The material travels down the flowguide, striking the
sensing plate and discharging through the outlet. The
force exerted on the sensing plate has both a vertical
and horizontal component. The design of the load cell
is such that it reacts to the horizontal component only;
the vertical component is ignored.
The sensing plate is displaced proportionally to the
material flow and is not susceptible to material build
up, so long as it does not bridge across to the housing.
Positive displacement of the load cell is limited by the
positive stop incorporated in the design of the load cell.
The displacement of the load cell is sensed by its strain
gauges. These convert the excitation signal from the
electronic integrator to produce a signal proportional
to material flow.
positive
stop
positive
displacement
horizontal
(force)
vertical
negative
stop

7ML19985CS01 Milltronics Millflo – INSTRUCTION MANUAL Page 5
Negative Displacement
A negative stop protects the load cell
against excessive negative displacement
which could functionally destroy it. The
negative stop is factory set so that the
output signal is limited to -20 mV when the
load cell is forced to travel in the negative
direction.
negative
displacement
Under no-flow conditions, the load cell/
sensing plate assembly is at rest at static
zero. Under this condition, the negative
stop should not contact the load cell, and
the output signal from the load cell will be
approximately -5 to 0 mV DC.
normal gap

Page 6 Milltronics Millflo – INSTRUCTION MANUAL 7ML19985CS01
Installation
Preparation
Prepare the site in accordance to the Siemens Milltronics drawing(s) provided. If no
drawings were provided or if there is confusion or doubt as to the Milltronics Millflo’s
installation, please consult your Siemens Milltronics representative.
When unpacking the Millflo, avoid subjecting the unit to mechanical shock. Excessive
mechanical shock can cause damage to the housing or load cell/sensing plate assembly.
The Millflo is generally shipped assembled with the sensing plate arrested to prevent
damage to the load cell.
The Millflo should be visually inspected for shipping damage. If damage is suspected,
contact your Siemens Milltronics representative and the shipping carrier.
When handling the Millflo, ensure the shipping stop is in place to secure the sensing
plate. Never subject the Millflo to shock by hitting it when trying to position it.
Welding
Remove the sensing plate and load cell before welding.
Load Cell Handling
The load cell tolerates very little negative displacement, or it may be functionally
destroyed. When handling the load cell, care must be taken not to force the gap open.
WARNING: Use extreme caution when arc welding in the area of the flowmeter to
ensure that no welding current flows through the flowmeter, risking destruction of
the load cell.
SUPPORT LOAD CELL THROUGHOUT HANDLING IN NON-VERTICAL POSITIONS.
IMPROPER HANDLING MAY FUNCTIONALLY DESTROY LOAD CELL