Siemens SITRANS WF100 User manual

SITRANS WF100
SITRANS
Flowmeters
SITRA
NS WF100
Operating Instructions
7MH7186
08/2021
A5E51108132
-AA
Introduction
1
Safety notes
2
Description
3
Installing/Mounting
4
Connecting
5
Commissioning
6
Service and maintenance
7
Technical specifications
8
Dimension drawings
9
Product documentation and
support
A

Siemens AG
Commercial Vehicles
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E51108132
Ⓟ
03/2022 Subject to change
Copyright © Siemens AG 2021.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 3
Table of contents
1 Introduction ........................................................................................................................................... 4
2 Safety notes........................................................................................................................................... 5
2.1 General safety instructions................................................................................................... 5
2.2 Installation in hazardous areas ............................................................................................. 6
3 Description............................................................................................................................................. 9
3.1 Material feed examples...................................................................................................... 13
4 Installing/Mounting ............................................................................................................................. 19
5 Connecting .......................................................................................................................................... 22
6 Commissioning .................................................................................................................................... 23
7 Service and maintenance .................................................................................................................... 27
8 Technical specifications....................................................................................................................... 31
9 Dimension drawings ............................................................................................................................ 33
A Product documentation and support................................................................................................... 34
A.1 Product documentation ..................................................................................................... 34
A.2 Technical support .............................................................................................................. 35
Index .................................................................................................................................................... 36

SITRANS WF100
4Operating Instructions, 08/2021, A5E51108132-AA
Introduction
1
Note
The Siemens flowmeter system is to be used only in the manner outlined in these operating
instructions, otherwise protection provided by equipment may be impaired.
•
It is your responsibility to read these operating instructions before installing and starting
up any component of the system to which the flowmeter is being applied.
Note
For industrial use only
This product is intended for use in industrial areas. Operation of this equipment in a
residential area may cause interference to several frequency based communications.
These operating instructions cover only solids flowmeter installation, operation, and
maintenance procedures. Integrator operating instructions are available for download from
our website:
Siemens weighing (http://www.siemens.com/weighing)
Follow these operating instructions for quick, trouble-free installation, and maximum
accuracy and reliability of your flow system.
We always welcome suggestions and comments about manual content, design, and
accessibility. Please direct your comments to:
Technical publications ([e-mail])

SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 5
Safety notes
2
2.1 General safety instructions
CAUTION
Correct, reliable operation of the product requires proper transport, storage, positioning and
assembly as well as careful operation and maintenance. Only qualified personnel should
install or operate this instrument.
Note
Alterations to the
product, including opening or improper repairs of the product, are not
permitted.
If this requirement is not observed, the CE and UKCA marks and the manufacturer's warranty
will expire.

Safety notes
2.2 Installation in hazardous areas
SITRANS WF100
6Operating Instructions, 08/2021, A5E51108132-AA
2.2 Installation in hazardous areas
Note
Nameplate
The nameplate shown is a typical example. Please check the nameplate on your device for
your specific device configuration.

Safety notes
2.2 Installation in hazardous areas
SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 7
Instructions specific to hazardous area installations
(Reference European ATEX Directive 2014/34/EU, Annex II, 1/0/6)
The following instructions apply to equipment covered by certificate number SIRA
11ATEX9367X, and CSAE 21UKEX9105X:
1. For use and assembly, refer to the main instructions.
2. The equipment is certified for use as Category 2D equipment and may be used in hazardous
zones 21 and 22 with dusts.
3. This equipment has a maximum surface temperature of T80 °C (in a 65 °C ambient). Refer to
the applicable code of practice for selection of this equipment with respect to specific dust
ignition temperatures.
4. The equipment is certified for use in an ambient temperature range of -40 °C to 65 °C.
5. If the conductors of the attached cable are terminated in the hazardous area, appropriate
explosion protection ('Ex') methods should be used that meet the requirements of European
Directive 2014/34/EU for Group II, Category 2D.
6. The equipment has not been assessed as a safety related device (as referred to by Directive
2014/34/EU Annex II, clause 1.5).
7. Installation and inspection of this equipment shall be carried out by suitably trained
personnel in accordance with the applicable code of practice.
8. Repair of this equipment shall be carried out by suitably trained personnel in accordance
with the applicable code of practice.
9. Components to be incorporated into or used as replacements in the equipment shall be
fitted by suitably trained personnel in accordance with the manufacturer’s documentation.
10.If the equipment is likely to come into contact with aggressive substances, then it is the
responsibility of the user to take suitable precautions that prevent it from being adversely
affected, thus ensuring that the type of protection is not compromised. Aggressive
substances: e.g. acidic liquids or gases that may attack metals or solvents that may affect
polymeric materials. Suitable precautions: e.g. regular checks as part of routine inspections
or establishing from the material’s data sheet that it is resistant to specific chemicals
Note
The flowmeter construction materials include: mild steel (polyester power coat painted) or
stainless steel, nonurethane encapsulant, and silicone rubber seals.
11.Product marking shall include the warning: Do not disassemble when an explosive dust
atmosphere is present.

Safety notes
2.2 Installation in hazardous areas
SITRANS WF100
8Operating Instructions, 08/2021, A5E51108132-AA
Conditions for safety use
•The equipment shall be installed such that the supply cable is protected from mechanical
damage. The cable shall not be subjected to tension or torque. If the cable is to be
terminated within an explosive atmosphere, then appropriate protection of the free end
of the cable shall be provided.
•The equipment shall be bonded to earth by the use of an approved type metal conduit and
conduit fittings.
•The equipment shall be supplied with an input voltage not exceeding 15 V.

SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 9
Description
3
SITRANS WF100 flowmeter is a low- to medium-capacity flowmeter for various product sizes,
densities, and fluidities in restricted spaces. This compact unit improves processing, increases
operating efficiency, and helps provide significant cost savings.
Operating with a microprocessor-based Siemens integrator, the Milltronics SF500 displays
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 deflection as they strike the
flowmeter sensing plate before continuing through the process unhindered. A strain gauge
load cell converts the horizontal force of the deflection into an electrical signal. The
integrator processes this to display the flowrate and integrated total weight. The process is
immune to the effect of product build-up as only horizontal force is measured.
WF100 features easy installation into standard pipe sizes, simple operation, and fast and
accurate flow response. WF100 is an accurate and repeatable force sensor and its
performance depends on consistent flow of material flow in and the quality of the
installation.

Description
SITRANS WF100
10 Operating Instructions, 08/2021, A5E51108132-AA
Components
Siemens flowmeters react to the horizontal component of force created by the impact of
material on the sensing plate. Siemens flowmeters consist of two physical components:
•the housing which includes the flowguide and the outlet: supports the sensing assembly
and guides the material flow
•the sensing assembly which includes the sensing plate and the load cell(s)
①
Load cell
②
Flowguide
③
Material
④
Outlet
⑤
Sensing plate
Note
On hazardous approved versions the load cell is
supplied with an integral cover which
must remain installed during operation

Description
SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 11
Horizontal sensing plate
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.
①
Positive stop
②
Negative stop

Description
SITRANS WF100
12 Operating Instructions, 08/2021, A5E51108132-AA
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.
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 sensing plate, and the output signal
from the load cell will be approximately -5 to 0 mV DC.
①
Negative displacement
①
Normal gap
Applications
Note
For best performance and limited maintenance requirements, keep in mind material
compatibility and flow patterns.
Ideal material characteristics
•low cohesion (flows well through chutes, 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)

Description
3.1 Material feed examples
SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 13
Location
Materials with low moisture content generally have excellent flow and adhesion
characteristics. In processes where material moisture content varies, select a flowmeter
location where the moisture content is lowest.
Linings
•Sensing plate abrasion resistant linings are often used for aggregates, barley, corn,
soybeans, wheat, and material with similar hardness and particle mass. Abrasive materials
are best monitored at low velocity.
3.1 Material feed examples
Screw conveyor
①
short pitch
②double flight
•
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 fl
ights 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
Rotary feeder
•
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

Description
3.1 Material feed examples
SITRANS WF100
14 Operating Instructions, 08/2021, A5E51108132-AA
Bucket elevators
•
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)
Conveyor belt
①
material discharge
baffle
•
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)
Drag conveyor
•
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
Vibratory feeder
①
motor
②vibrating pan
•
produces a non-pulsing material discharge
•use reverse flowguide transition for variable speed varieties
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.

Description
3.1 Material feed examples
SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 15
Feeder/flowguide transition
•
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
①baffle plate
•
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
Short fall chute
①< 0.6 m (2 ft)
•
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 minimized
•
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)

Description
3.1 Material feed examples
SITRANS WF100
16 Operating Instructions, 08/2021, A5E51108132-AA
Long fall chute
①> 0.6 m (2 ft)
•
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
Dogleg
•
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
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

Description
3.1 Material feed examples
SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 17
Pulsing feeder discharge damping
•
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.
Top view
①
baffle
②
conveyor discharge
③slats
•
for drag conveyors, use a baffle plate installed at the conveyor
discharge to reduce the heavy material pulsing associated with
this type of feeder
In-feed/discharge air pressure
①
to common dust
collector
•
Vent the in-feed and discharge chutes to a common dust
collector if a material in-feed/discharge differential air pressure
is anticipated and rotary airlock feeders are not used.
•
A tuning gate can be installed in each vent to balance the air
pressure.
•
If a dust collector is not used, an air bypass chute can be
installed between the flowmeter in-feed and discharge chutes.

Description
3.1 Material feed examples
SITRANS WF100
18 Operating Instructions, 08/2021, A5E51108132-AA
Flowguide capacity
CAUTION
If either the material bulk density and flowrate is near the flowmeter's in-feed diameter
upper limit, choose the next largest diameter.
Refer to the following chart to ensure the flowguide capacity is suitable.
Figure 3-1 Flowguide capacity chart

SITRANS WF100
Operating Instructions, 08/2021, A5E51108132-AA 19
Installing/Mounting
4
CAUTION
Installation shall be performed only by qualified personnel in accordance with local
governing regulations.
Preparation
Prepare the site in accordance to the Siemens installation drawing(s) that are available for
download from our website: Siemens weighing (http://www.siemens.com/weighing). If there
is confusion or doubt to do with the installation, please consult your Siemens representative.
CAUTION
When unpacking the flowmeter, avoid subjecting the unit to mechanical shock. Excessive
mechanical shock can cause damage to the housing or load cell/sensing plate assembly.
The flowmeter is shipped assembled with the sensing plate arrested to prevent damage to
the load cell.
The flowmeter should be visually inspected for shipping damage. If damage is suspected,
contact your Siemens representative and the shipping carrier.
CAUTION
When handling the flowmeter, ensure the shipping stop is in place to secure the sensing
plate.
Never subject the flowmeter to shock by hitting it when trying to position it.
WARNING
Welding
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(s).

Installing/Mounting
SITRANS WF100
20 Operating Instructions, 08/2021, A5E51108132-AA
Load cell handling
WARNING
Negative displacement on the load cell can functionally destroy the load cell. When
handling the load cell, care must be taken not to force the gap open.
Figure 4-1 Support load cell throughout handling in non-vertical positions
Figure 4-2 Improper handling may functionally destroy the load cell