Siemens Milltronics L-300 User manual

Instruction Manual September 2003
L-300
milltronics

© 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.
Copyright Siemens Milltronics Process
Instruments Inc.2003.AllRights ReservedDisclaimer of Liability
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electronic version. We encourage users to
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not be responsible for the contents of partial or
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versions.
While we have verified the contents of
this manual for agreement with the
instrumentation described, variations
remain possible. Thus we cannot
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in subsequent editions. We welcome
all suggestions for improvement.
Technical data subject to change.
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Email: [e-mail]
For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

i
Table of Contents
Milltronics L-300 Solids Flowmeter .................................................................................1
The Manual............................................................................................................................................... 1
Specifications ......................................................................................................................2
Installation ..........................................................................................................................4
Installing the Flowmeter........................................................................................................................ 4
Sensing Plate Mounting Details ................................................................................................5
Dual Load Cell Balance ....................................................................................................6
Calibration ................................................................................................................................................. 6
Material Tests........................................................................................................................................... 6
Applications ........................................................................................................................7
Materials ................................................................................................................................................... 7
Material Feed........................................................................................................................................... 7
Flowmeter In-Feed Chutes ................................................................................................................... 9
L-300 Outline and Details .................................................................................................11
Flowmeter Details ................................................................................................................................. 11
Cover Plate: Remove for calibration pulley mounting ........................................................12
Outline Dimensions............................................................................................................................... 13
Wiring....................................................................................................................................................... 14
Maintenance ......................................................................................................................14
Checks ............................................................................................................................................14
Unit Repair and Excluded Liability ..........................................................................................14

ii

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 1
Milltronics L-300 Solids Flowmeter
Milltronics L-300 solids flowmeter is a
medium-capacity flowmeter for various
product sizes, densities, and fluidities. The
sloped flowguide design conditions the
material into a repeatable flow pattern.
The flowmeter load cells output signals are
processed by the flowmeter integrator (ordered separately) to:
• monitor material flow
• maintain accurate
material inventory
• provide batch control for
process or loadout
purposes1
• control the ratio of
materials in continuous
blending processes 1
Components of the Milltronics V Series flowmeter system:
• L-300 flowmeter housing and flowguide consisting of force sensing mechanism
consisting of two parallelogram load cells and stainless steel sensing plate
• electronic flowmeter integrator (ordered separately)
The Manual
This instruction manual covers the installation, operation and maintenance of the
Milltronics L-300 solids flowmeter.
Please refer to this manual for proper installation and operation of any component of the
system to which the L-300 is being applied. Adhering to the installation and operating
procedures will ensure a quick, trouble-free installation and allow for the maximum
accuracy and reliability of your weighing system. Because the L-300 solids flowmeter is
used in conjunction with an integrator, refer to the integrator’s manual as well.
If you have any questions, comments, or suggestions about the manual contents, please
email us at [e-mail].
For the complete library of Siemens Milltronics manuals,
go to www.siemens-milltronics.com.
1. additional equipment required
flow guide
sensing plate
impact force
material
discharge
50°
material infeed
housing (cabinet)
B
A
A
+B

Page 2 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Specifications
Particle Size
• fine powder to 25 mm (1”)
Product Temperature
• -40 to 85 °C (-40 to 185 °F)
Ambient Temperature
• -40 to 65 °C (-40 to 150 °F)
Accuracy
•"1 %, 33 to 100 % of design capacity; extended accuracy range with linearization
function of integrator
Repeatability
•±0.2 %
Capacity Range
• 100 t/h (110 STPH) to 300 t/h (330 STPH)
Maximum Volumetric Capacity
•300m
3/h (10,600 ft3/h)
Maximum Tonnage
• 0 to 300 t/h (330 STPH) at 1 t/m3(62.4 lb/ft3)
• Up to 0 to 500 t/h (550 STPH) at higher bulk densities
Construction
• painted mild steel flowguide and housing (cabinet) with 304 (1.4306) stainless steel
sensing plate
• optional special linings for flowguide and sensing plate
Load Cells
• construction: 50 lb stainless steel parallelogram
• excitation: 10 V DC nominal, 15 V DC maximum
• output: 2 mV / V excitation at rated load cell capacity
• non-linearity: 0.02 % of rated output
• hysteresis: 0.02 % of rated output
• non-repeatability: 0.01 % of rated output
• overload: safe 150% of rated capacity, ultimate 300% of rated capacity

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 3
Connection
• Flexible conduit to customer’s junction box
Wiring
• 6 conductor #20 (0.5 mm2) shielded cable, or equivalent, for cable runs less than 150 m
(500 ft)
• 8 conductor #20 (0.5 mm2) shielded cable, or equivalent, for cable runs from 150 m (500
ft) to 300 m (1000 ft)
Classification
•CE
• For use in hazardous areas, use IS barrier strips (see your Siemens Milltronics
representative for details

Page 4 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Installation
The L-300 flowmeter system includes:
• main body (flowguide and sensing plate housing assembly)
• sensing plate (complete with mounting hardware)
• calibration pulley
• calibration weights
• calibration weight cable
• electronic integrator (ordered separately)
Install the Milltronics L-300 flowmeter in an area that is suitable for the system
classification rating. Position the flowmeter to permit opening the housing doors for
sensing plate access.
Installing the Flowmeter
Make sure the flowmeter inlet and outlet mounting surfaces are free from excessive
vibration.
1. Position the flowmeter into the desired location.
2. If necessary, shim the housing base to level the flowmeter.
3. Fasten the housing discharge to the downstream material chute.
4. Fasten the flowguide to the material infeed chute.
5. Install the sensing plate. Refer to the appropriate instruction manuals for levelling,
sensing plate installation and integrator interconnection instructions.
If the sensing plate has been shipped already installed, remove the shipping blocks
on the lower surface of the sensing plates.
Note: Provide sufficient mechanical support for the flowmeter and chutework.

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 5
Sensing Plate Mounting Details
C
dynamic beam Load cell (2)
socket head cap
screw M12-1.75x25 (8)
Lockwasher ø12(9)
static beam
hex screw M6-1 x 35(4)
hex nut M6-1(4)(set on both
sides for negative deflection of –
20 mV and a positive deflectin of
+30 mV, with 10 V DC excitation)
calibration pulley (secure
with M6 socket head cap
screws
calibration weight
(applied to
calibration pin with
calibration cable
sensing plate fixing bolts M12-1.75
x C/W M12 lockwasher
calibration pin
(TYP)
sensing plate (Install by
positioning ball of each cable
and then fixing sensing late
to dynamic beam). Top of
sensing plate must be level
in two planes.
S.S hex nut M6-1 (4) with set
screw (Factory set)
cable (2) (Both
cables must be
left taut)
Cable
hex bot M8-1.25 x 25
(4) Hex nut M8-1.25 (4)
Flatwasher ø8 (8)
(Factory set)

Page 6 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Dual Load Cell Balance
Verify the load cell signal balance before the initial start up of the flowmeter. Repeat this
procedure when one or both load cells are replaced.
Remove the cover plate on the back of the flowmeter and identify load cell “A” and load
cell “B”. When doing the load cell balance, as described in the integrator manual,
suspend a test weight from calibration position “B” and “A” as required using the
calibration pulley.
Follow the balancing instructions provided in the integrator instruction manual.
Calibration
Calibration weights are normally supplied with the Milltronics L-300. The following is the
basis for determining the weight(s) value in t/h for initial calibration. The value of the
calibration weight will be different after material tests have been completed and the
calibration factored to the same.
Program and calibrate the flowmeter/integrator system as described in the integrator
manual. However, before a system can be calibrated, a calibration weight should be
selected. The mass of this weight is based on a nominal value of 45 g per t/h1and should
be selected for 60 to 80% of the design flowrate.
Example:
Design rate = 300 t/h
Test rate to equal 70% of design rate
Test weight value = 300 t/h x 70% = 210 t/h
Test weight mass = 210 t/h x 45 g per t/h = 9.45kg
With the calibration weight selected, the integrator can be programmed and the system
calibrated as described in the integrator manual. For span calibration purposes, the
calibration weight should normally be applied at the center position.
After calibration, remove the calibration pulley and replace the cover plate. If possible,
perform material tests after calibration to verify the accuracy of the span calibration.
Material Tests
After installation, perform a material test using a known amount. Run the material
through the flowmeter and check the flowmeter integrator totalized value against the
known amount.
Use the manual span adjustment feature in the flowmeter integrator to make
adjustments for greatest accuracy.
1. Free flowing, high velocity, granular products such as wheat and corn will pro-
duce higher g per t/h forces.

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 7
Applications
Materials
Material characteristics for best results:
• Low cohesion (flows well through chutes angled 50° or higher, similar to a liquid)
• Low adhesion (does not stick to surfaces)
• Low abrasion (will not wear out chutes, flowguide or sensing plate)
• Low causticity (will not damage internal flowmeter components)
Most materials with low moisture content have excellent flow and adhesion
characteristics. In processes where material moisture content varies, select a flowmeter
location where the moisture content is lowest. Sensing plate and flowguide non-stick
linings are often used for fertilizer, wheat flour, sugar, and other materials with similar
properties.
Abrasive materials are best monitored at low velocity. Sensing plate and flowguide
abrasion resistant linings are often used for alumina, asbestos, barley, corn, limestone,
soya beans, wheat, and other materials with similar hardness and particle mass.
Standard flowmeter components are resistant to chemical reaction with most materials.
Special paint or coatings on exposed flowmeter components are often used for carbide,
fertilizer, phosphate, salt, sodium chloride, urea, and other materials with similar
properties.
The L-300 is best applied to free flowing, granular material that will not re-crystalize and
build up in the presence of moisture or high humidity.
Material Feed
Ideal material infeed characteristics:
• constant and relatively low material velocity
• uniform material flowrate (not pulsing)
• negligible air flow through the flowmeter
• flowguide 17 to 50 % full during operation
For best results, use material from an elevated bin, gravity fed to the flowmeter. If the
material is to be monitored after some process has been performed, choose the feeder
device that provides the most consistent material flow.
Use a reverse flowguide transition when high or variable velocity feeder material
discharges are anticipated. Refer to Flowmeter Infeed Chutes on page 9. Position the
flowmeter discharge chute so material cannot back up into the flowmeter housing.
For heavily pulsing feeder discharges, at less than 1 pulse per second, consult your local
Siemens Milltronics representative.
Note: For best performance and limited maintenance requirements, keep in mind
material compatibility and flow patterns.

Page 8 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Screw Conveyor
Rotary Feeder
Bucket Elevators
Conveyor Belt
Drag Conveyor
Vibratory Feeder
• most common type of material feeder
• short pitch and/or double flight screws preferred to
reduce the batch size (and increase the frequency) of
the material discharge pulse, or cut back the flights of a
standard screw so it ends before the discharge opening
• use reverse flowguide transition for variable operating
speeds or constant speeds above 40 rpm
short pitch
double flight
• provides an air seal between the upstream and/or
downstream process, and the flowmeter
• required if the material is pneumatically conveyed or
flowmeter/process isolation is required
• use reverse flowguide transition for variable operating
speeds or constant speeds above 10 rpm
• commonly used for grain applications
• feeder discharge damping required when slow
elevators (typically chain drive) produce heavily pulsing
material discharge
• use deadbox if required to reduce material velocity from
fast elevators (typically re-inforced belt drive)
• produces a non-pulsing material discharge
• reverse flowguide transition (and/or material discharge
baffle) often required for variable belt speeds or
constant speeds in excess of 1 m/s (200 feet/minute)
material
discharge
baffle
• operates at a constant (and relatively low) velocity
• reverse flowguide transition not normally required but
use feeder discharge damping or a discharge baffle to
minimize the pulsing material discharge
• produces a non-pulsing material discharge
• use reverse flowguide transition for variable speed
varieties
motor
vibrating pan

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 9
Flowmeter In-Feed Chutes
The flowmeter in-feed chute delivers the material from the bin or feeder discharge to the
flowmeter flowguide. The ideal in-feed chute pre-conditions the material flow to minimize
the effect of abrasion, velocity variation, feeder discharge trajectory variation, and
pulsing.
Feeder/Flowguide Transition
ShortFall Chute
Long Fall Chute
• reverse flowguide transition reverses direction of the
bin or feeder material discharge before the material
enters the flowmeter flowguide
• reversing direction forces the material into a desirable
flow pattern rather than permitting material to be flung
from the feeder, directly into the flowguide
• transition is especially important for high or variable
speed feeders
• forward flowguide transition maintains the material in
the same direction between the bin or feeder discharge
and the flowmeter flowguide
• transition is acceptable for a low and constant velocity
feeder
• if a forward flowguide transition must be used for a high
or variable speed feeder application, install a baffle
plate
baffle plate
• material in-feed chute where the bin or feeder
discharge to flowmeter flowguide fall is less than 0.6 m
(2 ft)
• material velocity due to gravity minimumized
• chute centreline and angle should coincide with that of
the flowguide, for a distance greater than or equal to
the flowguide diameter (before the flowguide inlet)
<0.6 m (2ft)
• material in-feed where the bin or feeder discharge/
flowguide fall is more than 0.6 m (2 ft)
• less desirable than the short fall chute because material
velocity is greater, increasing flowmeter component
abrasion
• greater distances after chute angle changes required to
settle material into desirable flow patterns
>0.6m (2ft)

Page 10 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Dogleg
Deadbox
Pulsing Feeder Discharge Damping
Knife Gate
• used to reduce the detrimental effect of high or variable
material velocity, especially when using a long fall
chute
• for abrasive materials, line the chute with an abrasion
resistant material, or use an in-feed deadbox
• installed where the chute angle changes. This will
cause the material to impact upon itself, rather than the
chute surface.
• used when the feeder discharge velocity is high,
variable, where long fall chute angles change, and if the
material is particularly abrasive
• install a temporary holding bin to receive pulsing
material discharge from a feeder. Then the material is
gravity fed from the bin to the flowmeter flowguide.
• provide manual or automatic control to ensure the
holding bin is neither emptied nor overfilled while the
feeder is in operation.
• bin could also be used for the integrator on-line
calibration, (if so equipped). Refer to the integrator
instruction manual for bin requirements.
• for drag conveyors, use a baffle plate installed at the
conveyor discharge to reduce the heavy material
pulsing associated with this type of feeder
baffle
slats
top view
conveyor
discharge
• For knife gates which supply on-off control from
supply bins or silos, open as shown in relationship to
flowguide.
bin
opening
direction
motor

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 11
In-Feed/Discharge Air Pressure
L-300 Outline and Details
Flowmeter Details
Flowmeter details are continued on the next page.
• If a material in-feed/discharge differential air
pressure is anticipated and rotary airlock
feeders are not used, vent the in-feed and
discharge chutes to a common dust collector.
• Install a tuning gate in each vent to balance the
air pressure.
• If a dust collector is not used, install an air
bypass chute between the flowmeter in-feed
and discharge chutes.
To common
dust collector
Flowguide with gasket
hex head bolt M12-
1.75 x 25 (12)
lockwasher ø12 (12)
enclosure with doors
and hardware
connectors load cell leads
load cell labels (2)
conduit (2 m)
latch (TYP)
hinge (TYP)
housing (cabinet)

Page 12 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Cover Plate: Remove for calibration pulley mounting
socket head cap screw M5-0.8 x 15 (6)
Lockwasher ø5 (6)
load cell ’A’
calibration position ’A’
normal calibration
pulley position
calibration position ’B’
load Cell ’B’
C

7ML19985EQ01 Milltronics L-300 – INSTRUCTION MANUAL Page 13
Outline Dimensions
Notes:
• mild steel or stainless steel construction
• flowmeter should be rigidly supported with discharge flange level
• any modification or change should be approved by Siemens Milltronics
A 600 mm (23.62”)
B 560 mm (22.1”) 4 equal spaces
C 500 mm (19.69”)
D 20mm (0.79”)
E 400 mm (15.75”)
F 180 mm (7.09”)
G 300 mm (11.81”)
H 14mm (0.55”) diameter holes
I 900 mm (35.43”)
J 175 mm (6.89”)
K 160 mm (6.3”)
N 750 mm (29.53”)
O 145 mm (5.71”)
P 130 mm (5.12”)
flowguide
housing
(cabinet)
access door
(typ).
sensing plate
min. distance 600 mm
(24”) (typ.)
800mm
(31.5”)
400 mm
(15.75”)
354 mm
(13.9”)
infeed discharge
load cell
(x2)
915mm
(36”)
50°
585mm
(23”)
1000mm
(39.4”)
325 mm
(12.8”) 650 mm
(25.6”)
A
B
C ins
H
D
E
F
F
G
I
JJ JJ
K
D
H
O
O
O
O
P
N

Page 14 Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01
Wiring
Maintenance
Checks
If material sticks to the sensing plate, incorporate a program to ensure that the
impingement area remains clean. If sticking persists, contact your Siemens Milltronics
representative.
Check for wearing of the sensing plate. If wear is excessive, contact your Siemens
Milltronics representative.
Unit Repair and Excluded Liability
All changes and repairs must be done by qualified personnel and applicable safety
regulations must be followed. Please note the following:
• The user is responsible for all changes and repairs made to the device.
• All new components must be provided by Siemens Milltronics Process
Instruments Inc.
• Restrict repair to faulty components only
• Do not re-use faulty components.
Note: When installing the L-300 in a hazardous area, use suitable intrinsically safe
barrier strips.
EXC
+ + +
EXC SIG SIG SIG SIG
load cell A load cell B
R
E
D
B
L
A
C
K
W
H
I
T
E
G
R
E
E
N
W
H
I
T
E
G
R
E
E
N
S
H
I
E
L
D

Index
A
About the L-300 1
Abrasion Resistant Linings
examples 7
Applications
considerations 7
B
Balance
dual load cells 6
C
Calibration
example 6
information 6
Clearance
installation considerations 4
Components
list 4
D
Dual Load Cells
balancing 6
F
Flowmeter
component list 1
Flowmeter Integrator
feature list 1
I
In-Feed/Discharge Air Pressure
information 11
Installation Considerations
clearance 4
Installing the L-300
procedure 4
L
L-300
detail diagrams 11
outline diagrams 11
M
Material Feed 7
ideal characteristics 7
Materials
considerations 7
N
Non-Stick Linings
examples 7
S
Sensing plate
mounting details 5
Special Paint or Coatings
examples 7

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