WIKA FSFD User manual

EN
Operating instructions
83795208.01 04/2022 EN
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg • Germany
Tel. [phone]
Fax [phone]
[email protected]
www.wika.de
Contents
Declarations of conformity can be found online at www.wika.com.
© 04/2022WIKA Alexander Wiegand SE & Co. KG
All rights reserved.
WIKA®is a registered trademark in various countries.
Prior to starting any work, read the operating instructions!Keep for
later use!
1. General information
2. Design and function
3. Safety
4. Transport, packaging and storage
5. Commissioning, operation
6. Faults
7. Maintenance and cleaning
8. Dismounting, return and disposal
9. Specifications
Flow switch for wet sprinkler systems
Model FSFD, with adjustable time delay
WIKA operating instructions, flow switch, model FSFD
1. General information
■The flow switch described in the operating instructions has been designed and
manufactured using state-of-the-art technology. All components are subject to strin-
gent quality and environmental criteria during production. Our management systems
are certified to ISO 9001.
■These operating instructions contain important information on handling the instru-
ment. Working safely requires that all safety instructions and work instructions are
observed.
■Observe the relevant local accident prevention regulations and general safety regula-
tions for the instrument's range of use.
■The operating instructions are part of the product and must be kept in the immediate
vicinity of the instrument and readily accessible to skilled personnel at any time. Pass
the operating instructions on to the next operator or owner of the instrument.
■Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
■The general terms and conditions contained in the sales documentation shall apply.
■Subject to technical modifications.
■Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: FL 50.01
2. Design and function
2.1 Overview
Case
U-bolt, nut
Saddle
U-bolt
Plastic paddle
Product label
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication

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83795208.01 04/2022 EN
WIKA operating instructions, flow switch, model FSFD
1. General information
■The flow switch described in the operating instructions has been designed and
manufactured using state-of-the-art technology. All components are subject to strin-
gent quality and environmental criteria during production. Our management systems
are certified to ISO 9001.
■These operating instructions contain important information on handling the instru-
ment. Working safely requires that all safety instructions and work instructions are
observed.
■Observe the relevant local accident prevention regulations and general safety regula-
tions for the instrument's range of use.
■The operating instructions are part of the product and must be kept in the immediate
vicinity of the instrument and readily accessible to skilled personnel at any time. Pass
the operating instructions on to the next operator or owner of the instrument.
■Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
■The general terms and conditions contained in the sales documentation shall apply.
■Subject to technical modifications.
■Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: FL 50.01
2. Design and function
2.1 Overview
Case
U-bolt, nut
Saddle
U-bolt
Plastic paddle
Product label
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication
2.2 Description
The model FSFD is a vane-type flow switch for use in wet sprinkler systems. Water flow
in the pipe moves the vane which generates a switching output, typically after a set
delay. All switches are activated when a water flow of 10 gallons per minute (gpm) or
more occurs but will not be activated when the flow is less than 4 gpm.
2.3 Terms used
Begri Erklärung
Maximum operating flow The maximum flow with which the instrument can be used
without changing the assured performance data.
Operating pressure The maximum pressure with which the instrument can be used
without changing the assured performance data.
Retard The time delay between the paddle's response to the flow
and the switching output.This delay is typically controlled by a
pneumatic retard unit.
2.4 Scope of delivery
Flow switch, operating instructions, Allen key to open the case
Cross-check scope of delivery with delivery note.
3. Safety
3.1 Explanation of symbols
WARNING!
... indicates a potentially dangerous situation that can result in serious injury or
death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in light injuries or
damage to property or the environment, if not avoided.
DANGER!
... identifies hazards caused by electrical power. Should the safety instructions not
be observed, there is a risk of serious or fatal injury.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused by
hot surfaces or liquids, if not avoided.
Information
... points out useful tips, recommendations and information for efficient and
trouble-free operation.

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WIKA operating instructions, flow switch, model FSFD
WIKA operating instructions, flow switch, model FSFD
3.2 Intended use
The model FSFD was developed to detect ow in wet sprinkler systems once the
sprinkler has been triggered.The pneumatic time delay can be adjusted on-site between
0 ... 70 seconds via an adjustment dial to avoid false alarms during water surges.The
instrument can switch electrical loads of up to AC 250 V, 10 A.
WARNING!
Injuries due to incorrect application
Use in an incorrect application can result in considerable injury and damage to
property.
▶If the valves controlling the water supply to a sprinkler system are closed,
the vane-type flow switches will not operate.All valves controlling the water
supply to a sprinkler system should be sealed or locked in the normally open
position.The normally open position should be monitored by a sprinkler
system monitoring switch.
▶Flow switches may not work, or may not work properly, if the sprinkler pipes
being monitored are blocked with deposits from slurries, stones or other
foreign objects. Sprinkler systems should be checked periodically for such
blockages, following the instructions in chapter 5 of NFPA standard 13A.
▶Only use the instrument in applications that lie within its technical perfor-
mance limits (e.g. max. ambient temperature, material compatibility, ...). For
performance limits, see chapter 9 “Specifications”.
▶Flow switches are not a substitute for insurance. Building owners should
always insure property and life which is protected by the sprinkler systems.
This instrument is not permitted to be used in hazardous areas!
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The manufacturer shall not be liable for claims of any type based on operation contrary
to the intended use.
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶Refrain from unauthorised modifications to the instrument.
▶Do not use the instrument within hazardous areas.
▶Do not use the instrument with abrasive or corrosive media.
Flow switches monitoring wet sprinkler systems must not be used to discharge
aqueous film-forming foam (AFFF), sprayed water or chemical suppression systems.
Flow switches used for these applications can result in false readings caused by water
surges, air pockets, etc.
Any use beyond or different to the intended use is considered as improper use.
3.4 Personnel qualification
WARNING!
Risk of injury should qualification be insufficient!
Improper handling can result in considerable injury and damage to property.
▶The activities described in these operating instructions may only be carried
out by skilled personnel who have the qualifications described below.
Skilled electrical personnel
Skilled electrical personnel are understood to be personnel who, based on their technical
training, know-how and experience as well as their knowledge of country-specific regula-
tions, current standards and directives, are capable of carrying out work on electrical
systems and independently recognising and avoiding potential hazards.The skilled electri-
cal personnel have been specifically trained for the work environment they are working in
and know the relevant standards and regulations.The skilled electrical personnel must
comply with current legal accident prevention regulations. Special operating conditions
require further appropriate knowledge, e.g. of aggressive media.
3.5 Labelling, safety marks
Product label (example)










Manufacturer's address Flow rate
Date of manufacture Pipe size
Ingress protection Article number
Electrical rating Serial number
Operating pressure Approvals
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by transport.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶When unloading packed goods upon delivery as well as during internal
transport, proceed carefully and observe the symbols on the packaging.
▶With internal transport, observe the instructions in chapter
4.2 “Packaging and storage”.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in instrument malfunction.Before putting it back into operation,
wait for the instrument temperature and the room temperature to equalise.
4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g. change
in installation site, sending for repair).
Permissible conditions at the place of storage:
■Storage temperature: 0 ... 68 °C [32 ... +154 °F]
■Humidity: 35 ... 85 % relative humidity (no condensation)
Avoid exposure to the following factors:
■Direct sunlight or proximity to hot objects
■Mechanical vibration, mechanical shock (putting it down hard)
■Soot, vapour, dust and corrosive gases
■Hazardous environments, flammable atmospheres
Store the instrument in its original packaging in a location that fulfils the conditions listed
above.
5. Commissioning, operation
Familiarise yourself with the following guidelines before installation:
■NFPA 72: National fire alarm and signaling code
■NFPA 13: Installation of sprinkler systems, section 3.17
■NFPA 25: Inspection, testing and maintenance of sprinkler systems, section 5.3.3.2
■Other applicable NFPA guidelines, local regulations and requirements of the compe-
tent authority

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WIKA operating instructions, flow switch, model FSFD
WIKA operating instructions, flow switch, model FSFD
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by transport.
Obvious damage must be reported immediately.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶When unloading packed goods upon delivery as well as during internal
transport, proceed carefully and observe the symbols on the packaging.
▶With internal transport, observe the instructions in chapter
4.2 “Packaging and storage”.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in instrument malfunction.Before putting it back into operation,
wait for the instrument temperature and the room temperature to equalise.
4.2 Packaging and storage
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g. change
in installation site, sending for repair).
Permissible conditions at the place of storage:
■Storage temperature: 0 ... 68 °C [32 ... +154 °F]
■Humidity: 35 ... 85 % relative humidity (no condensation)
Avoid exposure to the following factors:
■Direct sunlight or proximity to hot objects
■Mechanical vibration, mechanical shock (putting it down hard)
■Soot, vapour, dust and corrosive gases
■Hazardous environments, flammable atmospheres
Store the instrument in its original packaging in a location that fulfils the conditions listed
above.
5. Commissioning, operation
Familiarise yourself with the following guidelines before installation:
■NFPA 72: National fire alarm and signaling code
■NFPA 13: Installation of sprinkler systems, section 3.17
■NFPA 25: Inspection, testing and maintenance of sprinkler systems, section 5.3.3.2
■Other applicable NFPA guidelines, local regulations and requirements of the compe-
tent authority
The manufacturer is not liable for claims due to faults resulting from improper installation
of the instrument.
Tools: Cross-head screwdriver, 23 mm and 27 mm open-ended spanner, Allen key to
open the case
5.1 Requirements at the measuring location
■The process pressure and flow must not exceed the specified maximum operating
pressure and flow
■Permissible ambient and medium temperatures remain within the performance limits
■Protected from weather influences
■Protected against falling down
■The instrument must not be subjected to any external loading (e.g. use as a climbing
aid, support for objects)
■Sealing faces are clean and undamaged
■Sufficient space for a safe electrical installation
→ For performance limits, see chapter 9 “Specifications”.
5.2 Mounting instructions
■Mounting is only permitted in the no-flow state. Reliably isolate the instrument from
the flow system using the available valves and protective devices.
■Mount the flow switch in a horizontal or vertical pipe section with a straight run of
at least 5 pipe diameters both upstream and downstream.The straight run should
be free of bends, valves and other restrictions (→ see chapter “Installation require-
ments”).
1. Using a keyhole saw and a slow drill, drill a hole in the corresponding stainless steel
pipe, making sure that the hole is perpendicular to the centre of the pipe.
2. Remove burrs and sharp edges. Clean the pipe and remove any deposits and
foreign objects from the pipe so that the vane can move freely. Clean the outside of
the pipe to remove dirt and metal chips (→ see chapter “Installation requirements”
and the table “Compatible pipes” in chapter 9 “Specifications”).
3. In the horizontal pipe section, mount the flow switch on the top or side of the pipe.
Do not mount upside down, otherwise condensation may accumulate in the case
and impair the function of the instrument. For vertical pipe sections, mount the flow
switch on a pipe through which water flows upwards. Otherwise, the instrument may
not function properly.
4. Turn the vane against the direction of flow and insert it into the hole without bending,
cutting or kinking it. Insert the vane so that the arrow on the saddle points in the
direction of the water flow and press the saddle firmly against the pipe (→ see
chapter “Installation requirements”).
5. Install the U-bolt and tighten the nuts alternately with the required torque (→ see
table “Compatible pipes” in chapter 9 “Specifications”).The paddle must not scrape
or jam against the inside of the pipe.

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WIKA operating instructions, flow switch, model FSFD
Installation requirements
Length A must be at least 5 times the minimum diameter of the pipe away from
the nearest restrictions (e.g.bends, valves).
Wrong
Right Mounting hole
Flow
Flow
5.3 Mechanical mounting
■Fill the pipe system and check for leakage.
■The pneumatic retard is factory preset to 30 seconds. By turning the adjustment dial
it can be set from 0 to the maximum setting (70 seconds). Ensure that the time delay
does not exceed 90 seconds.
■Set the delay to the minimum required to avoid a false alarm due to water surges.
■The areas marked in red must not be adjusted/opened.
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication
Plastic paddle
Cable duct opening
U-bolt, nut
Flow direction
U-bolt
Allen key
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication
Display of the time delay
Time delay adjust-
ment dial
UL-listed compatible control panel
Load
EOL resistor
Power
DC 30 V or
AC 125/250 V
Initiating loop
Switching power:
AC 125/250 V: 10 A
DC 30 V: 2 A
Legend
NC Normally closed contact type (NC = normally closed)
NO Normally open contact type (NO = normally open)
COM Common contact
6. Faults
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the instrument
must be taken out of operation immediately.
▶Ensure that there is no longer any pressure present and the load circuit is
switched off and protect it against being put into operation accidentally.
▶Contact the manufacturer.
If a return is needed, please follow the instructions given in chapter 8.2 “Return”.
Grounding
screw

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WIKA operating instructions, flow switch, model FSFD
WIKA operating instructions, flow switch, model FSFD
5.3 Mechanical mounting
■Fill the pipe system and check for leakage.
■The pneumatic retard is factory preset to 30 seconds. By turning the adjustment dial
it can be set from 0 to the maximum setting (70 seconds). Ensure that the time delay
does not exceed 90 seconds.
■Set the delay to the minimum required to avoid a false alarm due to water surges.
■The areas marked in red must not be adjusted/opened.
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication
Plastic paddle
Cable duct opening
U-bolt, nut
Flow direction
U-bolt
Allen key
Roll paddle in
opposite direction
of water flow
Tight u-bolt nut with
washers alternately
Use tamper
allen key to remove
cover
Insert U-bolt
underneath of pipe
Direction of
water flow
Electrical conduit
entrance
1
2
3
4
5
6
Over view
1. Cover
2. U-bolt nuts
3. Saddle
4. U-bolt
5. Paddle
6. Data lable
Time delay
adjuster
Time delay
indication
Display of the time delay
Time delay adjust-
ment dial
5.4 Electrical mounting
The connection cable must ensure basic insulation for external circuits. The instrument
must be able to be completely de-energised via a switch or control unit.
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶The instrument may only be installed and mounted by skilled personnel.
▶Switch off the load circuit before starting work and secure against being
switched on unauthorised.
Cable preparation
■The cable gland used must be suitable for achieving an IP56/NEMA 4 ingress
protection.
■Ensure strain relief for the installed cables.
■Size the connection leads for the largest current strength in the circuits and ensure
sufficient UV resistance and mechanical stability.
Recommendation: 4-wire cable with conductor cross-section of 2.5 ... 4 mm². Provide wire
ends with suitable insulated ring cable lugs.
Grounding
Include the ground connection in the inside of the instrument into the grounding concept
of the application.
Clamping the cable
1. Open the case using the Allen key
2. Fit suitable cable gland (must correspond to IP56/NEMA 4 conditions) and feed in
the cable
3. Carry out the terminal assignment of the two SPDT switches according to the
switching function, tightening torque: Approx. 0.4 ... 0.5 Nm
4. If a second cable duct opening is required, remove the plug. To do this, hit a slotted
screwdriver hard with a hammer to break through the back wall of the knock-out
plug. Repeat the process on the opposite side until the plug falls out. Make sure that
the instrument is firmly anchored (→ see figure below).
5. Close the case again and fix it with the 2 supplied screws
■Break into the wire as shown to check the connection.
■Do not allow the stripped cable to protrude beyond the switch enclosure.
■Do not loop the cable.
■Common and normally open contacts close when the vane is deflected, i.e. when
water is flowing.
■Double switches allow the combination of applications in one single measuring
instrument.
UL-listed compatible control panel
Load
EOL resistor
Power
DC 30 V or
AC 125/250 V
Initiating loop
Switching power:
AC 125/250 V: 10 A
DC 30 V: 2 A
Legend
NC Normally closed contact type (NC = normally closed)
NO Normally open contact type (NO = normally open)
COM Common contact
6. Faults
CAUTION!
Physical injuries and damage to property and the environment
If faults cannot be eliminated by means of the listed measures, the instrument
must be taken out of operation immediately.
▶Ensure that there is no longer any pressure present and the load circuit is
switched off and protect it against being put into operation accidentally.
▶Contact the manufacturer.
If a return is needed, please follow the instructions given in chapter 8.2 “Return”.
Grounding
screw

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WIKA operating instructions, flow switch, model FSFD
WIKA operating instructions, flow switch, model FSFD
For further information, see chapter 1 “General information”.
Faults Causes Measures
Contact is not
switching in
accordance with the
specification at the
set switch point/reset
point
Electrical connection is
interrupted
Carry out a continuity test on the electri-
cal connection leads
Wiring error, e.g. short-circuit Check the pin assignment and correct it
if necessary
Electrical load unsuitable Maintain the permissible electrical loads
Contact contaminated Replace instrument
Short-circuit Moisture in the instrument Only use in ambient conditions for which
the ingress protection is suitable
Leakage at the ow
switch
Wrong tightening torque of the
U-bolt nuts
Take care to use the correct tightening
torque (→ see table “Compatible pipes”)
Dirt or foreign bodies under the
saddle sealing
Clean the pipe surface and sealings
before mounting
Surface of the mounting pipe
is not even
Ensure that the pipe mounting surface
does not have any dents or defects
Instrument is not
functioning correctly
Pipe is blocked by deposits or
foreign bodies
Remove deposits or foreign bodies
Flow port blocked Replace instrument
Switching status
remains unchanged
despite reaching the
switch point/reset
point
Error with switch point setting Carry out switch point setting with
matching test assembly (→ see chapter
5.4 “Electrical mounting”)
Contacts defective (e.g. fused
contact zone)
Replace instrument
Before recommissioning the new
instrument, provide a protective circuit
for the contact
Flow port blocked Replace instrument
Leakage Carry out a leak test
Seal the process connection or replace
the instrument
For the replacement of the instrument, observe chapters 8 “Dismounting, return and
disposal” and 5 “Commissioning, operation”.
7. Maintenance and cleaning
7.1 Maintenance
Inspect the instrument every month.
There is no specific maintenance required, only a regular check and inspection.
7.2 Cleaning
WARNING!
Risk of burns
With cleaning there is a risk through hot surfaces.
▶Before cleaning the instrument, allow it to cool sufficiently and use protecti-
ve equipment if necessary!
CAUTION!
Physical injuries and damage to property and the environment
Improper cleaning may lead to physical injuries and damage to property and
the environment. Residual media in the dismounted instrument can result in a
risk to persons, the environment and equipment.
▶Carry out the cleaning process as described below.
1. Before cleaning, correctly disconnect the instrument from the flow system and
switch off the load circuit.
2. Use the requisite protective equipment.
3. Clean the instrument with a moist cloth.
Electrical connections must not come into contact with moisture!
8. Dismounting, return and disposal
8.1 Dismounting
1. To avoid accidental water damage, all control valves should be closed and the
system completely drained before removing or replacing the flow switch.
2. Turn off the power supply and disconnect the wiring.
3. Loosen the nuts and remove the U-bolt.
4. Carefully lift the saddle until you can reach the vane with your fingers.
5. Roll-up the vane and lift it out of the hole.
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶The dismounting of the instrument may only be carried out by skilled
personnel.
▶Remove the instrument once the system has been isolated from power
sources.
WARNING!
Physical injury
When dismounting, there is a danger from aggressive media and high pressures.
▶Observe the information in the material safety data sheet for the corresponding
medium.
▶Dismount the instrument when the flow is interrupted.

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WIKA operating instructions, flow switch, model FSFD
WIKA operating instructions, flow switch, model FSFD
8.2 Return
Strictly observe the following when shipping the instrument:
All instruments delivered to WIKA must be free from any kind of hazardous substances
(acids, bases, solutions, etc.) and must therefore be cleaned before being returned.
WARNING!
Physical injuries and damage to property and the environment through
residual media
Residual media in the dismounted instrument can result in a risk to persons,
the environment and equipment.
▶With hazardous substances, include the material safety data sheet for the
corresponding medium.
▶Clean the instrument, see chapter 7.2 “Cleaning”.
When returning the instrument, use the original packaging or a suitable transport
packaging.
8.3 Disposal
Incorrect disposal can put the environment at risk.
Dispose of instrument components and packaging materials in an environmentally
compatible way and in accordance with the country-specific waste disposal regulations.
Do not dispose of with household waste. Ensure a proper disposal in accordan-
ce with national regulations.
9. Specifications
Specications
Permissible temperature ranges
Ambient 0 ... 68 °C [32 ... 154 °F]
Storage 0 ... 68 °C [32 ... 154 °F]
Ingress protection IP56/NEMA 4, suitable for indoor and outdoor applications
Process medium Water
Operating pressure 268 psi [18.5 bar] 1)
Switching function 2 x SPDT (single pole double throw), form C
Electrical rating ■10 A, AC 125/250 V
■2 A, DC 30 V res.
Electrical connection Two inputs for 1/2" conduit
1) With UL346 the operating pressure is limited to 175 psi [12 bar] for pipe size 8 inch (DN 200).
For further specifications, see WIKA data sheet FL 50.01 and the order documentation.
Compatible pipes
Model Nominal
pipe size
Outer
diameter in
mm [inch]
Wall thickness
Light-weight
wall in mm
[inch]
Schedule
10 in mm
[inch]
Schedule 40
in mm [inch]inch mm
FSFD 2 2 DN50 60.3 [2.38] 1.65 [0.06] 2.77 [0.11] 3.91 [0.15]
FSFD 2.5 2.5 DN65 73 [2.88] 2.13 [0.08] 3.05 [0.12] 5.16 [0.2]
FSFD 3 3 DN80 88.9 [3.5] 2.11 [0.08] 3.05 [0.12] 5.49 [0.22]
FSFD 3.5 3.5 101.6 [4] - 3.05 [0.12] 5.74 [0.23]
FSFD 4 4DN100 114.3 [4.5] 2.13 [0.08] 3.05 [0.12] 6.02 [0.24]
FSFD 5 5 - 141.3 [5.57] - 3.4 [0.13] 6.55 [0.26]
FSFD 6 6DN150 168.3 [6.63] 2.92 [0.12] 3.4 [0.13] 7.11 [0.28]
FSFD 8 8DN200 8.63 [219.1] - 3.76 [0.15] 8.18 [0.32]
Model Bore size in
mm [inch]
Tightening torque of the
U-bolt nuts in Nm [ft/lb]
FSFD 2 33±2 [1.3±0.08] 45 [33]
FSFD 2.5
FSFD 3 50.8±2 [2±0.08] 85 [63]
FSFD 3.5
FSFD 4
FSFD 5
FSFD 6
FSFD 8