Festo SFAH Operating and installation instructions

Platzhalter
en Description
8075046
2017-09
[8075048]
Flow sensor
SFAH

SFAH
2Festo – SFAH –
Translation of the original instructions
SFAH
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.

SFAH
Festo – SFAH – English 3
English – Flow sensor SFAH
Table of contents
1 About this document 6......................................................
1.1 Further applicable documents 6...............................................
2 Safety 7..................................................................
2.1 Intended use 7.............................................................
2.2 General safety information 7..................................................
3 Service 7.................................................................
4 Accessories 7..............................................................
5 Product overview 8.........................................................
5.1 Configuration 8............................................................
5.2 Product variants and type code 9..............................................
6 Function 9................................................................
6.1 Operating statuses 10........................................................
6.2 Switching outputs 10.........................................................
6.2.1 Switching functions 10...............................................
6.2.2 Change in colour 13..................................................
6.2.3 Volume/load pulse 13................................................
6.3 Analogue output 14..........................................................
6.4 Filters 15...................................................................
6.5 Zero point synchronisation 15..................................................
6.6 Switchover of standard condition for volume values – REF / Cond 15...................
6.7 Replicating parameters 16.....................................................
6.8 Minimum/maximum value 16..................................................

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4Festo – SFAH – English
7 Installation 17..............................................................
7.1 Mechanical installation 17.....................................................
7.1.1 Plate mounting 17...................................................
7.1.2 Lateral plate mounting 17.............................................
7.1.3 H-rail mounting 17...................................................
7.1.4 Wall mounting 18....................................................
7.1.5 Front panel mounting kit 18...........................................
7.2 Pneumatic installation 19.....................................................
7.3 Inlet situation 19............................................................
7.4 Electrical installation 20.......................................................
8 Commissioning 21...........................................................
8.1 LCD display 21..............................................................
8.2 Switch on sensor (RUN mode) 23...............................................
8.3 Shift measured value indicator (RUN mode) 23....................................
8.4 Displaying parameters (SHOW mode) 24.........................................
8.4.1 Switching output OutA or volume pulse output 24.........................
8.4.2 Switching output OutB or analogue output Anlg 24.........................
8.5 Enter the security code (EDIT mode) 26..........................................
8.6 Configuring switching output (EDIT mode) 26......................................
8.7 Change device settings (EDIT mode) 26..........................................
8.8 Set volume pulse output (EDIT mode) 27.........................................
8.9 Set analogue output (EDIT mode) 27............................................
8.10 Replicating parameters (EDIT mode) 27..........................................
8.11 Configure sensor (EDIT mode) 28...............................................
8.12 Teach switching points (TEACH mode) 28.........................................
8.13 Zero point synchronisation (zero adjust) 29.......................................
8.14 Menu structure (EDIT mode) 30.................................................
9 IO-Link interface description 32................................................
9.1 General IO-Link specification 32................................................
9.2 Communication functions 32...................................................
9.3 Identification parameters 33...................................................
9.4 IO-Link standard parameters and commands 34...................................
9.5 Smart Sensor Profile parameters 36.............................................
9.6 Device-specific parameters 38.................................................
9.7 IO-Link Teach-In 43...........................................................
9.8 Block parameterisation 45.....................................................
9.8.1 Block parameterisation for BDC1 (OutA) 45...............................
9.8.2 Block parameterisation for BDC2 (OutB) 45...............................
9.8.3 Block parameterisation for BDC3 (pulse) 45..............................
9.8.4 Block parameterisation for analog output 46..............................

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9.9 Process data IN 46...........................................................
9.10 Conversion factors 47........................................................
9.10.1 Conversion factors for process data variable, process data variable min,
process data variable max, and setpoint values SP1, SP2 47.................
9.10.2 Conversion factors for the hysteresis, switchpoint d.SP and max signal
delta (s.obS) 48.....................................................
9.10.3 Conversion factors for volume / mass units 48............................
9.10.4 Scaling factors for standards 49........................................
9.10.5 Scaling factors for gases 49...........................................
9.11 Fault clearance IO-Link 49.....................................................
10 Operation 51...............................................................
10.1 Restoring factory settings (restore) 51...........................................
11 Disassembly 51.............................................................
12 Fault clearance 52...........................................................
13 Technical data 53............................................................
14 Example for calculating the maximum display error 57.............................

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6Festo – SFAH – English
Note
Installation and commissioning must be carried out only by properly qualified personnel in accord
ance with these operating instructions.
Note
The product is suitable for use only for industrial purposes.
In residential areas, measures for radio interference suppression may be necessary. It is not suitable
for commercial invoicing, such as for measurement of air consumption in public utilities.
1 About this document
This document describes the use of the above-mentioned product. Certain aspects of use are described
in other documents and must be observed (è1.1 Further applicable documents).
1.1 Further applicable documents
For all available product documentation èwww.festo.com/pk
Device description file (IODD) èwww.festo.com/sp

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Festo – SFAH – English 7
2 Safety
2.1 Intended use
The SFAH is intended for monitoring the flow of gaseous media in piping systems or terminals in the in
dustrial sector èChapter 13 Technical data.
2.2 General safety information
 Note that if the switching status of the outputs is modified in the Edit mode, the new status will be
effective immediately.
 Activate password protection in order to prevent possible severe personal injuries due to unauthor
ised manipulation of signal statuses èChapter 8.5 Security code.
 Only use the product in its original condition, without any unauthorised modifications.
 Only use the product if it is in an excellent technical status.
 Take the ambient conditions into consideration at the location of use.
 Do not use the product in combination with inflammable, caustic, vapour-emitting or other hazard
ous media.
 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.
Disposal
 Observe the local specifications for environmentally friendly disposal.
3 Service
 Consult your regional Festo contact if you have any technical queries èwww.festo.com
4 Accessories
Accessories èwww.festo.com/catalogue

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8Festo – SFAH – English
5 Product overview
5.1 Configuration
23
4
1
5
6
7
1A-key
2Edit button
3B-key
4Flow connection
èMarking on the product
5Flow connection
èMarking on the product
6Plug for electrical connection
7Display
Fig. 1

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Festo – SFAH – English 9
5.2 Product variants and type code
Characteristic Value Description
Type SFAH Flow sensor
Flow measuring range -0.1 Max. 0.1 l/min
-0.5 Max. 0.5 l/min
-1 Max. 1 l/min
-5 Max. 5 l/min
-10 Max. 10 l/min
-50 Max. 50 l/min
-100 Max. 100 l/min
-200 Max. 200 l/min
Flow input U Unidirectional
B Bidirectional
Pneumatic port -Q4 Push-in connector 4 mm
-Q6 Push-in connector 6 mm
-Q8 Push-in connector 8 mm
-G18 G1/8
-G14 G1/4
Thread type None
FFemale thread
Outlet orientation S Straight
AR Angled, alignable
Electrical output 1 -PNLK PNP or NPN or IO-Link
Electrical output 2 -PNVBA PNP or NPN or 0 … 10 V or 1 … 5 V or 4 … 20 mA
Electrical connection -L1 Plug L1
-M8 Plug M8
Certificate None
+T Test report
Tab. 1
6 Function
The SFAH measures the flow rate (standard flow rate, mass flow rate) with the help of a thermal pro
cedure. Measurements are carried out using a micromechanical sensor element with a downstream
electronic evaluation unit.
Connection to higher-level systems is provided by 2 switching outputs, an analogue output and/or an
IO-Link interface. The outputs can be configured as appropriate to the application.
The switching outputs can be configured to monitor a threshold value, signal range or signal change.
The outputs can be set as PNP or NPN and normally open (NO) or normally closed (NC). Through the IO-
Link interface, process values can be read out and parameters changed and transmitted to additional
devices. Through integration of the flow rate, a volume/load signal can be calculated and output via
a pulse output as well as a cumulated measurement value via IO-Link.

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10 Festo – SFAH – English
Fig. 2 SFAH signal structure
6.1 Operating statuses
Operating status Function
RUN mode – Basic status after the operating voltage is applied
– Display of the current measured value
– Display of the selected inputs and outputs
– Switchover between the measured variables of flow rate and volume/load
SHOW mode – Display of current settings of the switching outputs and analogue output
– Display and resetting of the minimum and maximum values
– Display of the average flow rate measurement
EDIT mode – Setting of parameters
TEACH mode – Acceptance of the current measured value to determine switching points
Tab. 2 Operating statuses of the SFAH
6.2 Switching outputs
6.2.1 Switching functions
Threshold value comparator in the flow measurement for OutA or OutB _|¯
Function NO (normally open) NC (normally closed)
Switching function:
– 1 switching point (SP)
TEACH mode:
– 2 Teach points (TP1, TP2)
– SP = ½ (TP1+TP2) q
1
0
HY
OUT
SP
TP1 TP2
q
1
0
HY
OUT
TP1 TP2
Tab. 3 Threshold value comparator: setting of switching point [SP] and hysteresis [HY]

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Window comparator in the flow measurement for OutA or OutB _|¯|_
Function NO (normally open) NC (normally closed)
Switching function:
– 2 switching points
(SP.Lo, SP.Hi)
TEACH mode1):
– 2 Teach 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) 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]

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Auto difference monitoring d_|¯|_
This function permits monitoring of a signal value for constancy. If the applied signal is constant in
the range between [SP.Lo] and [SP.Hi], the reference signal qRef is automatically determined. The result
is a switching operation at the output and signalises the start of the signal monitoring procedure.
If signal remains in the monitoring range [d.SP] around qRef, the signal is stable. When the monitoring
range is left, the output switches back.
12
q3
Out
SP.Hi
qRef
SP.Lo
t.obS d.SP
1Reference value qRef is determined
2Measured value deviates by [d.SP] from the reference value
3Monitoring range
Tab. 5
The parameters [SP.Lo], [SP.Hi], [t.obS] and [d.SP] can be configured by the user. The greater [t.obS] is
set, the more stable the signal must be to establish the reference value qRef.
Function NO (normally open) NC (normally closed)
Switching function:
– 2 switching points
(SP.Lo, SP.Hi) for setting
the valid work range
– 1 switching point (d.SP)
for determination of the monit
oring area
TEACH mode1):
– 2 Teach points (TP1, TP2)
– TP1 = SP.Lo, TP2 = SP.Hi
SP.Lo qRef SP.Hi
d.SP
1
0
Out
q
1
SP.Lo qRef SP.Hi
d.SP
0
Out
q
1) SP.Lo = smaller signal value, SP.Hi = larger signal value, independent of the Teach sequence
Tab. 6

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6.2.2 Change in colour
A red colour change can be set in the display for OutA and OutB, dependent on the switching status.
As a result, the switching status of the sensor can be identified over a large distance.
The colour change reacts both on OutA and on OutB, depending on the setting.
Parameter Meaning
bLUE Display is always blue; the colour change function is switched off.
R.On Display is red if the switching output is set (High =1) or blue if the switching output is not set
(Low = 0).
R.OFF Display is red when the switching output is not set. ( Low = 0) or blue when the switching
output is set ( High =1 ).
Tab. 7 Colour change on the display
6.2.3 Volume/load pulse
A threshold value SP for the volume or load can be set in the accumulated volume/load measurement.
If the configured threshold value is reached, a switching impulse is emitted at the Pulse output
(èFig. 2) for an adjustable period of time. With each switching impulse, the volume/load measure
ment is started again (èFig. 3).
Volume/load pulse with accumulated volume measurement
Setting NO (normally open) Setting NC (normally closed)
t
t
0
OUT
1
0Pulse
V
SP
t
t
0
OUT
1
0
SP
Pulse
V
Fig. 3

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6.3 Analogue output
Analogue 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
In the bidirectional sensor variants, the analogue output signal 0…10 V, 1…5 V or 4…20 mA is assigned
to the complete sensing range (-100 to +100 % FS), in the unidirectional variants to the positive sensing
range (0 to +100 % FS). If only part of the sensing range is to be used, the analogue value output can be
scaled to this partial range with the help of the parameters [In.Lo], [In.Hi].
2 mA
20 mA
4 mA
0 % 40 % 80 % 100 %
12
Scaled
Not scaled
Analogue signal
-40 %
-80 %-100 %
1Starting point of the scaled sensing range (In.Lo)
2End point of the scaled sensing range (In.Hi)
Fig. 4 Example: scaling of the analogue signal at the current output

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6.4 Filters
With the low-pass filter [Filt], the flow input signal can be smoothed. This also changes the rise and fall
time. Filtering affects all outputs as shown in the following diagram. The filter time equals the time
constant Т of a low-pass filter.
A smoothed average [AVER] of the flow measurement can be displayed in the SHOW mode.
1) The display filter is only active as long as AVER is selected in the SHOW mode
Fig. 5 Example: scaling of the analogue signal at the current output
6.5 Zero point synchronisation
The sensor has the possibility to make an offset synchronisation for the zero point. This synchronisation
affects the display and all outputs. The offset synchronisation is possible only for the Zero Adjust = ON
setting. As a result, the zero range hiding is no longer active. For bidirectional sensor variants, the function
Zero Adjust [Z.Adj] is preset to [ON]. As a result, visible offset errors can be set to zero through a Zero Adjust
Teach procedure (offset synchronisation). A requirement for this is that the measured value in the Teach
procedure lies in the range _ 3 % FS with reference to the original factory adjustment.
6.6 Switchover of standard condition for volume values – REF / Cond
The represented flow rate units can be related to different standard conditions. It is possible to switch
between the following standard conditions. In the menu navigation on the display, the corresponding
standard is determined by selecting the reference temperature.
REF / Cond Off 15 °C 20 °C
Standard DIN 1343 ISO 2533 ISO 6358
Air pressure (absolute) [bar] /
[kPa]
1.01325 /
101.325
1.01325 /
101.325
1 /
100
Temperature [°C] 0 15 20
Air humidity [%] 0 0 65
Status information “Option” Does not light up Lights up Lights up
Correction factor, measurement range
limit value
1 1.055 1.087
Fig. 6

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16 Festo – SFAH – English
Calibration of the SFAH refers back to the physical standard conditions in accordance with DIN 1343.
If a standard other than DIN 1343 is selected, the specified measurement range (±100 % FS) changes in
value by the factor specified in Fig. 6. This change is visualised in the display through [Option].
Changing the reference standard only adjusts the display on the sensor. If necessary, the effect on
the nominal measurement range of the respective sensor must also be considered when evaluating
the analogue output.
6.7 Replicating parameters
With this function, all settings that have been carried out on one sensor (master) can be transferred to
other, identical sensors (device). If multiple sensors with similar function are to be installed in a system,
the commissioning time can thereby be significantly reduced.
Parameter transmission takes place through the IO-Link function. The already configured sensor (mas
ter) is brought into a master mode and so can transfer its parameters to a device with similar design
(same device ID).
6.8 Minimum/maximum value
In the SHOW mode, the minimum values and the maximum values for the flow measurement are displayed
and reset.
Switching off the operating voltage resets the minimum and maximum values.

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7 Installation
Note
Installation and commissioning are to be carried out only by qualified personnel.
7.1 Mechanical installation
Any mounting position is possible but can have an influence on measurement precision
(èChapter 13, Nominal conditions).
7.1.1 Plate mounting
 Secure the SFAH to the plate by using screws of suitable
length.
– Tightening torque: 0.5 Nm
– Hole diameter: max 3.3 mm
Fig. 7
7.1.2 Lateral plate mounting
1. Mount H-rail mounting on the SFAH.
– Tightening torque 0.5 Nm
2. Mount H-rail mounting with washers and M4 screws.
– Tightening torque 0.5 Nm
Fig. 8
7.1.3 H-rail mounting
1. Mount H-rail mounting on the SFAH.
– Tightening torque 0.5 Nm
2. Hang H-rail mounting in the H-rail 1.
3. Press the H-rail mounting in the direction of the arrow until
the mounting slide catches 2.
Fig. 9
1
2

SFAH
18 Festo – SFAH – English
7.1.4 Wall mounting
1. Screw wall mounting to SFAH.
– Tightening torque 0.5 Nm
2. Mount wall mounting.
Fig. 10
7.1.5 Front panel mounting kit
1. Mount H-rail mounting on the SFAH.
– Tightening torque 0.5 Nm
2. Mount accompanying hexagon head screw on the H-rail mounting.
3. Push panel frame through cut-out (62 mm x 24 mm _0.1 mm).
– Front panel thickness 1...3 mm
4. Push sensor through front frame so that all 4 remaining hooks
engage.
5. Push clamping element over hexagon head screw.
6. Attach sensor with accompanying knurled nut.
– Tightening torque 0.3 Nm
Fig. 11

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Festo – SFAH – English 19
7.2 Pneumatic installation
For unidirectional sensors SFAH-…U-…, the flow is supplied at connection 1 and withdrawn from
connection 2. The direction of flow is indicated on the sensor by an arrow.
Note
Only for unidirectional types: If the tubing connection of the SFAH is incorrect, the measurement
values are presented with the negative minus sign and lie outside the specified measurement range.
For the bidirectional sensors SFAH-…B-…, the flow can be supplied at connection 1 or connection 2.
To have a sign that correctly represents the flow direction in the display, the flow direction can be set in
the Edit menu and also represented in the sub-display.
Connect the sensor as follows:
 Mount the two hoses to connection 1 and connection 2 èMarking on the product.
7.3 Inlet situation
The specified accuracies shown in the technical data of the sensor are achieved when the conditions
for the inlet section from èTab. 8 are complied with on the sensor.
Min. internal
diameter of inlet
path in mm
Design of the inlet
path
Measuring range
-0.1 -0.5 -1 -5 -10 -50 -100 -200
2.9 (e.g. QS4) Any Permitted1) ± 2 %2) Not permitted3)
4 (e.g. QS6) Straight
Permitted1)
± 1 %2)
4 (e.g. QS6) Angle directly on sensor
4 (e.g. QS6) Angle at distance of
5-80 cm
± 10 %2)
6 (e.g. QS8) Any Permitted1)
i
1) Accuracy as specified in the technical data èChapter 13 Technical data.
2) Deviation from the specified accuracy.
3) Operation possible, but deviations of more than 20 % must be expected.
Tab. 8 Effect of the inlet conditions and connection sizes on the specified accuracy

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20 Festo – SFAH – English
7.4 Electrical installation
Warning
Electric voltage
Injury caused by electric shock, damage to machine and to system
 Only use power sources which guarantee reliable electrical isolation of the operating voltage in
accordance with IEC/DIN EN 60204-1.
 Observe the general requirements for PELV circuits in accordance with IEC/DIN EN 60204-1.
 Use switched-mode power supplies, which ensure reliable separation in accordance with
EN 60950/VDE 0805.
Note
Long signal lines reduce the resistance to interference.
 Comply with the maximum permissible I/O signal line length of 30 m, 20 m in IO-Link operation
Note
The binary outputs at pin 2 and pin 4 can be wired as PNP or NPN connections as needed.
 Configure binary outputs according to your wiring èSetting special menu [SPEC] section.
Pin Colour1) Assignment Plug L1
1Brown (BN) Operating voltage +24 V DC
2Black (BK) Switching output OutA, volume/load pulse or
IO-Link (C/Q line)
3White (WH) Switching output OutB or analogue output
4Blue (BU) 0 V
1) Colours apply for connecting cables NEBS-L1...
Fig. 12
Pin Colour1) Assignment Plug M8 x 1
1Brown (BN) Operating voltage +24 V DC
2White (WH) Switching output OutB or analogue output
3Blue (BU) 0 V
4Black (BK) Switching output OutA, volume/load pulse or
IO-Link (C/Q line)
1) Colours apply for connecting cables NEBU-...M8...
Fig. 13