Siemens Milltronics MILLFLO Manuale utente

MILLFLO

milltronics

Instruction Manual September 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.

Instruments Inc.2003.AllRights ReservedDisclaimer of Liability

This document is available in bound version and in

electronic version. We encourage users to

purchase authorized bound manuals, or to view

electronic versions as designed and authored by

Siemens Milltronics Process Instruments Inc.

Siemens Milltronics Process Instruments Inc. will

not be responsible for the contents of partial or

whole reproductions of either bound or electronic

versions.

While we have verified the contents of

this manual for agreement with the

instrumentation described, variations

remain possible. Thus we cannot

guarantee full agreement. The

contents of this manual are regularly

reviewed and corrections are included

in subsequent editions. We welcome

all suggestions for improvement.

Technical data subject to change.

MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.

Contact SMPI Technical Publications at the following address:

Technical Publications

Siemens Milltronics Process Instruments Inc.

1954 Technology Drive, P.O. Box 4225

Peterborough, Ontario, Canada, K9J 7B1

Email: techpubs@siemens-milltronics.com

For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

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

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 techpubs@siemens-milltronics.com.

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

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