Festo SFAW Series User manual

en Operating
instructions
8049884
1602a
[8049886]
Flow sensor
SFAW

SFAW
2Festo – SFAW – 1602a
Translation of the original instructions
SFAW
Installation and commissioning must be carried out only by properly qualified personnel in accordance
with these operating instructions.
Identification of hazards and instructions on how to prevent them:
Warning
Hazards that can cause death or serious injuries.
Note
Dangers that can result in material damage or failure of function.
Other symbols:
Recommendations or references to additional sources of information.

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English – Flow sensor SFAW
Table of contents
1 Product description 5.......................................................
1.1 Overview 5................................................................
1.2 Key features 6.............................................................
2 Function and application 7...................................................
2.1 Operating statuses 8........................................................
2.2 Switching outputs 9.........................................................
2.2.1 Switching functions 9...............................................
2.2.2 Colour change 9...................................................
2.2.3 Volume pulse 10....................................................
2.3 Analogue output 10..........................................................
2.4 Filter 11...................................................................
2.5 Security code 11............................................................
2.6 Minimum/maximum value 11..................................................
3 Requirements for product use 12...............................................
4 Installation 13..............................................................
4.1 Inlet and outlet situation 13...................................................
4.2 Mechanical installation 14.....................................................
4.3 Fluid connection 15..........................................................
4.4 Electrical installation 15.......................................................
5 Commissioning 17...........................................................
5.1 Symbols on the display 17.....................................................
5.2 Switch on sensor (RUN mode) 20...............................................
5.3 Displaying parameters (SHOW mode) 21.........................................
5.3.1 Start SHOW mode 22................................................
5.3.2 Display minimum/maximum value and reset 22...........................
5.3.3 Display average and reverse related filter time constant 22..................
5.4 Configure sensor (EDIT mode) 23...............................................
5.4.1 Enter the security code 25............................................
5.4.2 Setting the switching characteristics of the switching outputs 25.............
5.4.3 Setting display units and analogue output 26.............................

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5.4.4 Changing sensor settings 27...........................................
5.4.5 Replicating parameters 27............................................
5.5 Teach switching points (TEACH mode) 28.........................................
5.6 Measuring volume manually (RECORDER mode) 28.................................
6 Operation 29...............................................................
7 Maintenance and care 29.....................................................
8 Disassembly 29.............................................................
9 Fault clearance 30...........................................................
10 Accessories 31..............................................................
11 Technical data 32............................................................
12 Hole patterns and dimensional drawings 35......................................

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1 Product description
You can find detailed specifications for the product, the device description file (IODD)
with a description of the IO-Link parameters and the declaration of conformity at:
èwww.festo.com/sp www.festo.com.
The operating instructions describe the entire function range. The function range is lim
ited, depending on the product variant.
1.1 Overview
2
1
3
45
6
7
1Display, rotatable
2B key
3Edit button
4A key
5Electrical connection
6Fluid connection 1 (input), rotatable
7Fluid connection 2 (output), rotatable
Fig. 1 Control sections and connections

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1.2 Key features
Feature Value Description
Type SFAW Flow sensor for liquid media
Flow measuring range 32 Max. 32 l/min.
100 Max. 100 l/min.
Further measured variable Without temperature measurement
T Temperature
Connection type, input CClamped terminal connection
SFemale hose connector
TFemale thread
XUser connection (è4.3 Fluid connection)
Connection standard, input Without specification
S5 Clamped terminal connection in accordance with
DIN 32676:2009-05
Connection size, input G12 … G1 Thread G ½, G ¾, G 1
R12 … R1 Thread R ½, R ¾, R 1
N12 … N1 Thread NPT ½, NPT ¾, NPT 1
13, 19 Female hose connector 13 mm, 19 mm
15, 20 Clamped terminal connection DN 15, DN 20
Connection type, output CClamped terminal connection
SFemale hose connector
TFemale thread
EAs for input
XUser-provided connection (è4.3 Fluid connection)
Connection standard,
output
No specification
S5 Clamped terminal connection in accordance with
DIN 32676:2009-05
Connection size, output G12 … G1 Thread G ½, G ¾, G 1
R12…, R1 Thread R ½, R ¾, R 1
N12 … N1 Thread NPT ½, NPT ¾, NPT 1
13, 19 Female hose connector 13 mm, 19 mm
15, 20 Clamped terminal connection DN 15, DN 20
Type of mounting without mounting accessories
WWall mounting
Electrical output 1 PNLK PNP or NPN or IO-Link
Electrical output 2 PN PNP or NPN
PNVBA PNP or NPN or 0…10 V or 1…5 V or 4…20 mA
Electrical output 3 VBA 0…10 V or 1…5 V or 4…20 mA
Electrical connection M12 Plug connector M12, A-coded
Electrical accessories +2.5 S Straight socket, 2.5 m cable
+5 S Straight socket, 5 m cable
Protective devices GSafety guard
Tab. 1 Overview of variants

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2 Function and application
The SFAW is intended for use in monitoring the flow, volume and temperature of liquid media in piping
or terminal devices in industry. The flow velocity is recorded in accordance with the vortex principle. The
flow rate and the accumulated volume are calculated from the flow velocity. An optional, integrated
temperature sensor records the medium temperature.
Interfacing to the higher-level systems is provided by 2 switching outputs, an analogue output and/or
an IO-Link interface, depending on the type. The outputs can be configured as appropriate to the ap
plication.
The switching outputs can be configured to monitor a threshold value or a range. For each output, PNP
or NPN and normally open (NO) or normally closed (NC) can optionally be set. Via the IO-Link interface,
process values can be read out and parameters changed and transmitted to additional devices.
Flow rate
Q
Temperature
T
InA
analogue Q
InB
analogue T
InC
Volume pulse VP
InD
Volume recorder V
OutA
binary Q/BDC1
OutC
binary VP/BDC3
OutB
binary T/BDC2
OutD
binary Q/BDC4
Pin 4
Q or VP
Pin 2
T or Q
InA
analogue Q/PDV1_2byte
InB
analogue T/PDV2_2byte
InD
analogue V/onReq_4byte
Fig. 2 SFAW-…PNLK-PNVBA-…: Signal structure

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Flow rate
Q
Temperature
T
InA
analogue Q
InB
analogue T
InC
Volume pulse VP
InD
Volume recorder V
OutA
binary Q/BDC1
OutC
binary VP/BDC3
OutB
binary T/BDC2
OutD
binary Q/BDC4
Pin 4
Q or VP
InA
analogue Q/PDV1_2byte
InB
analogue T/PDV2_2byte
InD
analogue V/onReq_4byte
Pin 2
T or Q
Pin 5
Q or T
Fig. 3 SFAW-…PNLK-PN-VBA-…: Signal structure
2.1 Operating statuses
Operating status Function
RUN mode – Basic status after the operating voltage is switched on
– Display of the current measured value
– Display of the selected inputs and outputs
– Switchover between the measured variables of flow rate, volume and
temperature
SHOW mode – Display of current settings of the switching outputs and analogue output
– Display and resetting of the minimum and maximum values
Edit mode – Setting or modification of parameters
TEACH mode – Acceptance of the current measured value to determine switching points
RECORDER mode – Manual measurement of the accumulated volume
Tab. 2 Operating statuses of the SFAW

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2.2 Switching outputs
2.2.1 Switching functions
Threshold value comparator in the flow measurement for OutA or OutD and in the temperature meas
urement for OutB
Function NO (normally open) NC (normally closed)
Switching function:
– 1 switching point (SP)
TEACH mode1):
– 2 teach-in points (TP1,
TP2)
– SP = ½ (TP1+TP2)
Q
1
0
HY
OUT
SP
TP1 TP2
Q
1
0
SP
HY
OUT
TP1 TP2
1) Only with flow measurement
Tab. 3 Threshold value comparator: setting of switching point SP and hysteresis HY
Window comparator in the flow measurement for OutA or OutD and in the temperature measurement
for OutB
Function NO (normally open) NC (normally closed)
Switching function:
– 2 switching points
(SP.Lo, SP.Hi)
TEACH mode1)2):
– 2 teach-in points (TP1,
TP2)
– TP1 = SP.Lo, TP2 = SP.Hi
HY HY
Q
1
0
OUT
TP1=SP.Lo TP2=SP.Hi
Q
1
0
OUT
HY HY
TP1=SP.Lo TP2=SP.Hi
1) Only with flow measurement
2) SP.Lo = smaller value, SP.Hi = larger value, independent of the Teach sequence
Tab. 4 Window comparator: setting of switching points SP.Lo and SP.Hi and hysteresis HY
2.2.2 Colour change
A red colour change in the display can be set for OutA, OutB and OutD. As a result, the system status
can be identified over a large distance.
The measured variable that first caused the colour change always appears in the display. The unit and
the corresponding output OutA/OutC/OutD flash in the sub display. The display remains red until all
switching outputs are in the blue status again.

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2.2.3 Volume pulse
A threshold value for the volume can be set in the accumulated volume measurement. If the configured
threshold value is reached, a switching impulse is emitted at the output OutC for an adjustable period
of time. With each switching impulse, the volume measurement is started again (èFig. 4).
Volume pulse with accumulated volume measurement
Setting NO (normally open) Setting NC (normally closed)
t
t
0
OUT C
1
0Pulse
V
SP
t
t
0
OUT C
1
0
SP
Pulse
V
Fig. 4 Volume pulse
2.3 Analogue output
Analogue signal
The signal of the analogue output can be assigned the physical measured variables of flow rate or tem
perature. The physical measured value of flow rate is configured as standard.
Output signal
The analogue output can be operated either as a voltage output 0 … 10 V or 1 … 5 V or as a current
output 4 … 20 mA. The voltage output 0 … 10 V is set at the factory.
Scaling of the analogue signal
The analogue output signal 0 … 10 V, 1 … 5 V or 4 … 20 mA is assigned to the complete sensing range at
the factory. If only part of the sensing range is to be used, the analogue value output can be scaled to
this partial range.

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2 mA
20 mA
4 mA
0 % 40 % 80 % 100 %
12
Scaled
Not scaled
Analogue signal
1Starting point of the scaled sensing range (In.Lo)
2End point of the scaled sensing range (In.Hi)
Fig. 5 Example: scaling of the analogue signal at the current output
2.4 Filter
The filter smoothes the flow measurement signal. Smoothing takes place in 8 steps and affects all out
puts. The switching times of the flow-related switching outputs and the rise and fall time of the ana
logue output change.
2.5 Security code
A 4-digit numerical code can be set to protect the device settings from unauthorized access. The secur
ity code must be entered each time the settings are changed in the EDIT mode and the TEACH mode.
2.6 Minimum/maximum value
In the SHOW mode, the minimum values and the maximum values for the flow measurement or the
temperature measurement are displayed and reset.
Switching off the operating voltage resets the minimum and maximum values.

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3 Requirements for product use
 Only use the product in original status, without any unauthorised modifications.
 Only use the product if it is in an excellent technical status.
 Take into consideration the operating conditions at the location of use.
 Comply with all applicable national and international regulations.
 Do not use the product in combination with inflammable, caustic, vapour-emitting or other hazard
ous media.
 Foreign matter and other contaminants in the measurement medium can damage the product and
cause incorrect measurements and malfunctions. Use media only in accordance with specifications
(è11 Technical data).
 Check the operating medium to determine compatibility with the materials it contacts.
 Observe the specifications on the product labelling.
 Remove all transport packaging. Recycle packaging material (exception: oil paper = residual waste).
Range of applications and certifications
In combination with the UL mark on the product, the information included in this section is also applic
able for compliance with the certification requirements of Underwriters Laboratories Inc. (UL) for USA
and Canada. Observe the following English-language remarks from UL:
UL approval information
Product category code QUYX, QUYX7
File number E322346
Considered standards UL 610101, CAN/CSAC22.2 No.610101
UL mark
Tab. 5
Only for connection to a NEC/CEC Class 2 supply.
Raccorder uniquement a un circuit NEC/CEC Classe 2.

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Electrical and environmental ratings
Input voltage max. 30 V DC, Class 2
Input current max. 0.26 A
Power max. 8 W
Pressure differential max. 1.2 MPa
Ambient temperature max. 50 °C / 122 °F
Pollution degree 2
Humidity range 93 %
Only for indoor use.
Altitude up to 2000m. Altitude up to 2000m or above 2000m if specified by the manufacturer.
Tab. 6
Unit shall be supplied by a power source which complies with the requirements of a
limitedenergy circuit in accordance with IEC/EN/UL/CSA 610101 or a Limited Power
Source (LPS) in accordance with IEC/EN/UL/CSA 609501 or IEC/EN/UL/CSA 623681
or a Class 2 circuit in accordance with NEC or CEC.
4 Installation
4.1 Inlet and outlet situation
The specified accuracies of the sensors are achieved if the inlet path and the outlet path at the sensor
are sufficiently long and straight and have no disturbing geometries, such as edges, curves or the like.
The following conditions must be taken into account prior to installation:
SFAW-32-… SFAW-100-...
Internal diameter D of the sensor geometry 11 mm 19 mm
Min. internal diameter of inlet path 1.1 x D 1.05 x D
Typ. inlet path L 10 cm
Min. outlet path 5 cm
Tab. 7 Minimum requirements for fluid connection

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L
L
L
Fig. 6 Possible inlet situations
4.2 Mechanical installation
Any mounting position is allowed. The sensor can be installed without mounting accessories or with
wall mounting.
M3
Max. 0.5Nm
M3
Max. 0.5Nm
Fig. 7 Direct mounting:
hole pattern èFig. 15
Fig. 8 Wall mounting (SFAW-…-W-…):
hole pattern èFig. 16

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4.3 Fluid connection
The medium is fed in at fluid connector 1 and removed at fluid connector 2 (èFig. 1).
Connect the sensor as follows:
 Mount supply line at fluid connector 1 and discharge line at fluid connector 2 of the sensor. When
screwing in, do not jam the threads.
When making customer-specific fluid connectors, observe dimensional drawings (èFig. 17).
Change fluid connector
Fig. 9 Dismantling fluid connection Fig. 10 Mounting fluid connection: Check that
the O-ring is seated correctly.
4.4 Electrical installation
Warning
Use only power sources which guarantee reliable electrical isolation of the operating
voltage in accordance with IEC/EN 60204-1. Consider also the general requirements for
PELV circuits in accordance with IEC/EN 60204-1.
The switching outputs at pin 2 and pin 4 can be wired as PNP or NPN connections as
needed.
 Pay attention to the wiring when configuring the switching outputs
(è5.4.4 Changing sensor settings).
 Connect sensor.
– Consider the maximum permissible line length: 30 m, with IO-Link 20 m.
– Consider the maximum tightening torque of the plug connector: 0.5 Nm.

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Pin Assignment1) Wire colour2) Plug connector
1DC +24 V operating voltage Brown (BN) 5-pin M12
2Switching output OutB or OutD or analogue
output
White (WH)
30 V Blue (BU)
4Switching output OutA or OutC or IO-Link
(C/Q line)
Black (BK)
5Analogue output or not assigned Grey (GY)
1) Observe signal structures (èFig. 2 and Fig. 3).
2) When using the connecting cable from the electrical accessories (è1.2 Key features)
Tab. 8 Pin allocation
Circuit diagrams
SFAW-…-PNLK-PNVBA-… SFAW-…-PNLK-PN-VBA-…
Tab. 9 Circuit diagrams

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5 Commissioning
5.1 Symbols on the display
1
2
1
3
45
6
1Output display
2Measured value indicator / menu
3Bar graph for input signal InC or InD
4Unit / submenu
5Information / input display
6Bar graph for input signal InA
Fig. 11 Display
Example for
LCD display
Significance
Output display
[OutA] Switching output OutA selected
[OutA] Switching output OutA set
[OutC] Switching output OutC selected
[OutC] Switching output OutC set
[OutB] Switching output OutB selected
[OutB] Switching output OutB set
[OutD] Analogue output OutD selected
[OutD] Switching output OutD set

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Example for
LCD display
Significance
Information / input display
Input signal InA: graphic display of the current measured value related to the max
imum measured value of the measuring range
Input signal InC: graphic display of the volume measurement
[InA] Input signal InA (flow) selected
[InC] Input signal InC (volume) selected
[InB] Input signal InB (temperature) selected
[Lock] Security code activated
[Spec] Special menu activated
Tab. 10
Example for LCD display Significance
Menu Submenu
Measured value indicator and unit in the RUN mode
[17.3] [l/Min] Measured value indicator and unit
Menu and submenu for the switching outputs
[Edit] [Flow] Edit menu for the switching outputs
[Fctn] Determination of the switching function: threshold value
comparator
[Fctn] Determination of the switching function: window comparator
[18.0] [SP] Value of switching point (only for threshold value comparator)
[8.0] [SP.Lo] Value of lower switching point (only for window comparator)
[12.2] [SP.Hi] Value of upper switching point (only for window comparator)
[2.8] [HY] Hysteresis value
[NO] [logic] Switching characteristics of the switching outputs:
[NO] = normally open, [NC] = normally closed
[bLUE] [COLR] Display colour:
[bLUE] = Blue, colour change function deactivated
[R.ON] = Red, if switching output set
[R.OFF] = Red, if switching output not set
[200] [PULS] / [MSEC] Width of the volume pulse

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Example for LCD display Significance
Menu Submenu
Menu and submenu for the analogue output
[l/Min] [Flow] / [Unit] Display unit for the flow measurement
[1_5V] [Out] Analogue output, switchable between [0_10V], [1_5V], [4_20MA]
[93.0] [In.Hi] / [%] Scaling of the analogue output: Set final value of the flow or
temperature characteristics curve. (specification in % FS - full
scale)
[3.1] [In.Lo] / [%] Scaling of the analogue output: Set starting value of the flow or
temperature characteristics curve. (specification in % FS - full
scale)
[Ltr] [VOL] / [Unit] Display unit for volume measurement
[°C] [tEMP] / [Unit] Display unit for temperature measurement
Menu and submenu for extreme and average values
[5.1] [MIN] / [l/Min] Minimum measured flow rate since switch-on or the last reset
[30.8] [MAX] / [l/Min] Maximum measured flow rate since switch-on or the last reset
[20.2] [MIN] / [°C] Minimum measured temperature since switch-on or the last reset
[50.5] [MAX] / [°C] Maximum measured temperature since switch-on or the last reset
[20.8] [AVER] / [l/Min] Average of the flow measurement, filter time constant switchable
between 650 ms, 1200 ms, 2500 ms
Menu and submenu for the special menu (Spec)
[1200] [Filt] Value of the filter time constant for the flow signal
[10] [Eco] Economy mode: time after which the display background lighting is
switched off
[PNP] [bin] / [Out] Shift of the switching outputs (binary) between PNP and NPN
[FLOW] [bin] / [Pin4] Switching of the switch signal (binary) at pin 4 between flow
monitoring and volume pulse
[FLOW] [bin] / [Pin2] Switchover of the switching signal (binary) or the analogue output
signal at pin 2 between flow and temperature monitoring
[FLOW] [ANLG] / [Pin5] Switchover of the analogue output signal at pin 5 between flow
and temperature measurement
[OFF] [Lock] / [Code] Activation and determination of the security code
[OFF] [MASt] Activation of the IO-Link master function for replication of
parameters
Tab. 11

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5.2 Switch on sensor (RUN mode)
The RUN mode is the basic status of the flow sensor. The current values are displayed. The basic status
can be optionally reached from other modes by:
– pressing Edit button for 3 seconds
– expiration of a monitoring time (timeout)
 Switch on the operating voltage.
èThe sensor is in RUN mode.
èThe signals active at the outputs are displayed (signal structure èèFig. 2 and Fig. 3).
By pressing the A key or B key, the display can be switched between the measured variables flow rate,
volume and temperature (èFig. 12).