Festo SFAB-10U User manual

Flow Sensor SFAB
Festo AG & Co. KG
Postfach
D−73726 Esslingen
++49/711/347−0
www.festo.com
Operatinginstructions 743 851
0811NH
Original: de
Note
Installation and commissioning may only be performed in accordance with thess
instructions by technicians with appropriate qualifications.
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 Product description
1.1 Overview
92
3
4
1
5
6
7
8
1Supply port 1
èMarking on the product
2Display
3B button
4Edit button
5A button
6Plug for electrical
connection(M12)
7Supply port 2
èMarking on the product
8Hole for fitting the plate
9Fastening slide for hat rail fitting
and wall fitting (rear)
Fig.1
1.2 Characteristics
Feature Order code Design
Basic version SFAB Flow sensor
Flow measuring range −10 Max. 10l/min
gg
−50 Max. 50l/min
−200 Max. 200l/min
−600 Max. 600l/min
−1000 Max. 1000l/min
Flow input U Unidirectional
Type of mounting −H Via DIN H−rail
yp g
−W With wall fastening
Pneumatic connection Q6 Push−in connector 6mm
Q8 Push−in connector 8mm
Q10 Push−in connector 10mm
T14 Push−in connector for 1/4"
T516 Push−in connector for 5/16"
T38 Push−in connector for 3/8"
Electrical output −2SA 2x PNP or NPN, 1 analogue output 4 Ū20 mA
p
−2SV 2x PNP or NPN, 1 analogue output 0 Ū10 V
Electrical connection −M12 Plug M12x1, 5−pin, A−coded
Additional function at −D Final control element
Electrical accessories 1) −2.5S Connecting cable, straight socket, cable 2.5m
−5S Connecting cable, straight socket, cable 5m
−2.5A Connecting cable, angled socket, cable 2.5m
−5A Connecting cable, angled socket, cable 5m
1) Included in the scope of delivery.
Fig.2
2 Function and application
The SFAB is designed to monitor changes in flow and air consumption for suitable
media in piping systems or end devices in industry; suitable media èchapter 11
Technical specifications. Measurement is carried out by means of a thermal
procedure. The amount of heat, which is drawn from a heated surface of the
sensor by the medium flowing through it, is calculated here. Through the amount
of heat removed, the flow or accumulated air consumption is determined and
shown on the display. The connection to higher−level systems is made via 2 binary
outputs (Out A/B) and one analogue output (Out C). Switching points can be set
for both binary outputs. For flow measurement, switching points are possible for
both binary outputs, and for accumulated air consumption meaurement a
consumption switch impulse for outputA (Out A). The combination of accumulated
air consumption measurement (Out A) and flow measurement (Out B) is possible.
The flow value is output via the analogue output. Up to a flow range of 200 l/min,
an integrated flow actuator can be optionally ordered. This permits setting the flow
with the precision described in chapter11, Technical specifications.
3 Conditions for the safe use of the product
Warning
Depending on the functioning of the machine/system, manipulation of signal
states may cause serious personal injury.
· Note that if the switching status of the outputs is modified in Edit mode,
the new status will be effective immediately.
· Activate the password protection (security code) in order to prevent the
unintentional change by unauthorised third parties èchapter5.4, section
Security code.
Warning
Use of the product in combination with prohibited media can result in personal
injury.
·Donot use the product in conjunction with inflammable gases, corrosive
gases, oxygen etc. The product is intended only for measuring the flow of
media, which are listed as suitable in the chapter11 Technical specifications.
Important
Condensation water, oil mist, foreign matter and other dirt in the compressed air
can damage the product and cause incorrect measurements and functional
disorders.
· Make sure that the specified air quality class is maintained for the operating
medium èchapter11 Technical specifications.

Note
Improper handling can result in malfunctions.
· Make sure that the following specifications are always observed:
· Compare the maximum values specified in these operating instructions with
your actual application (e.g. operating media, pressures, forces, torques,
temperatures, masses, speeds, operating voltages, flow rates).
· Take into consideration the ambient conditions at the location of use.
· Please comply with national and local safety laws and regulations.
· Remove all transport packing such as protective wax, foils (polyamide), caps
(polyethylene), cardboard boxes (except for the sealing elements of the
pneumatic connections).
The packing is intended for recycling (except for: oiled paper = other waste).
· Use the product in its original state. Unauthorized modification is not permitted.
4 Installation
4.1 Mechanical assembly
Note
Interference due to electromagnetic influences can cause damage.
· When installing the SFAB, make sure that a lateral distance of x = 10 mm from
earthed surfaces is maintained èFig.3 ŪFig.5.
It can be fitted in any position. Fasten the SFAB as follows:
hat rail (battery mounting)
1. Hang the SFAB onto the hat rail.
2. Press the SFAB in the direction of the
arrow until the fastening rale catches
èFig.3.
Fig.3
Wall mounting
1. Attach the adapter plate, such as with
two M3 screws.
2. Hang the SFAB onto the adapter plate.
3. Press the SFAB in the direction of the
arrow until the fastening rale catches
èFig.4.
Fig.4
Plate mounting (threaded mounting)
· Attach the SFAB with washers and M4
screws.
Tightening torque 1 Nm
Fig.5
Turn the display
The display can be rotated in 90° steps.
The range of rotationis limited by a stop to
about 270°.
Fig.6
4.2 Pneumatic connection
The air mass stream is added at connection 1 and removed at connection 2
èFig.1.
Hook up hoses to the SFAB as follows:
· Insert the two hoses into the PlugIn connections of connection 1 and
connection 2 èMarking on the product.
Note
If the hoses are connected to the SFAB incorrectly, the measurement values will
flash in the display.
4.3 Electrical connection
Warning
Use only power units which guarantee reliable electrical isolation of the
operating voltage as per IEC/DIN EN 60204−1.
Observe also the general requirements for PELV power circuits as per
IEC/DINEN 60204−1.
Switch power packs are permitted, providing they guarantee reliable isolation in
accordance with EN 60950/VDE 0805.
Note
Long signal cables reduce the immunity to interference.
· Make sure that the signal cables are shorter than 10 m.
Note
The binary outputs at pin2 and pin3 can be wired as PNP or NPN connections as
needed.
· Make sure that you also configure the binary outputs according to your wiring
èSetting special menu [SPEC] section.
· Wire the SFAB as follows:
Pin Assignment Core colours 1) Plug 2)
1 DC +24 V operating voltage brown (BN) 5−pin M12
1
2 Binary outputsB (OutB) white (WH) 1
3 0V blue (BU)
24
4 Binary outputA (OutA) black (BK)
5
24
5 Analogue outputC (OutC) 3) grey (GY) 5
3
1) With use of the connecting cable from the electrical accessories èchapter 1.2 Characteristics
2) The tightening torque for the union nut at the plug is max. 0.5Nm.
3) Voltage U and current I èchapter 11, Technical specifications
Fig.7
Circuit diagrams
SFAB−Ū−2SA SFAB−Ū−2SV
Fig.8
5 Commissioning
1. Switch on the operating voltage.
2. Establish the desired switching behaviour of the binary outputs.
· With flow measurement [FLW]: Switching points [SP] and hysteresis [Hy]
èFig.9.
· With accumulated air consumption measurement [ConS], only with Out A,
consumption switch impulse [CI] èFig.10.
Switching point and hysteresis with flow measurement for Out A / Out B
Thresholdcomparator Windowcomparator
Switch element function NO (closer)
q
1
0
Hy
OUT
SP
[l/min]
Hy Hy
q
1
0
OUT
SP Lo SP Hi
[l/min]
Switching element function NC (normally closed)
q
1
0
SP
Hy
OUT
[l/min] q
1
0
OUT
SP Lo SPHi
Hy Hy
[l/min]
Fig.9

Consumption switch impulse [CI] with accumulated air consumption
measurement
Setting NO (normally open  closer) Setting NC (normally closed  opener)
CI CI
t
t
0
OUTA
1
0
CI
100ms
[l], [m´]
CI CI
t
t
0
OUTA
1
0
CI
100ms
[l], [m´]
Fig.10
A threshold value for air consumption can be set with the consumption switch
impulse [CI]. If the set threshold value is reached, a switch impulse is emitted at
the output Out A for 100 ms. With each switch impulse, measurement of the air
consumption is started again.
Symbols on the display
Symbols Description
Out A/Out B Switching output A / switching output B
Lock Security code is active (locked against unauthorized programming)
Run Accumulated air consumption measurement is active in the Recorder mode
Option The sensor is set to a standard condition that differs from the factory setting
èchapter 5.4, Setting standard condition section
Stop Reset accumulated air consumption measurement value
Switching output set/not set
Threshold comparator
Window comparator
Air consumption switching mode (consumption  only for Out A)
Impulse for accumulated air consumption (consumption impulse)
Switching point
Lower switching point
Upper switching point
Hysteresis
Normally open contact
Normally closed contact
Switching mode flow (flow  only with Out A)
Minimum flow (flow low)
Maximum flow (flow high)
Special menu
Analogue filter
Digital filter
Display red with switching status ON or logical 1
Display red with switching status OFF or logical 0
Output plus switch
Output zero switch
Segments light up: graphic display of the current measured value in relation
to the max. measured value of the measuring range.
Running light (1 segment): Air consumption measurement for Out A or
RECORDER mode active
3 segments flashing: Hysteresis value is displayed
1 segment flashing:
 Segment 6: switching point SP or SP.Lo will be displayed
 Segment 8: switching point SP.Hi will be displayed
 Segment 1: min. flow (F.Lo) will be displayed
 Segment 10: max. flow (F.Hi) will be displayed
Fig.11
Preparing commissioning
In the base state, the product is in the RUN mode. The current measurement
values are displayed. The base state can be reached from other modes by:
 pressing Edit button for 3 seconds or
 passage of a monitoring time, timeout
1. Switch on the operating voltage.
The SFAB is in the RUN mode.
2. Check the settings of the SFAB èchapter 5.3 SHOW mode.
5.1 Icons for representing the menu structure
Icon Meaning
Automatic return to the basic status (RUN mode) when the monitoring time
has expired (here 80 seconds)
In order to return to the basic status (RUN mode), press the Edit button for
3seconds
Create flow (for teaching the measured value  here flow 1)
Symbol on the display flashes (here Out B)
Security code active (Lock  blocked against unauthorised programming)
Security code inactive (Lock)
Press button (here A button)
Press A button or B button. Then the SFAB switches to the setting shown by
the arrows
Press A button and B button simultaneously
Press button (here A button) and Edit button simultaneously
Press A button or B button and thus set the desired value
Display for a value or switching point. Value can be set
Press the Edit button
Branched in the menu
Fig.12
5.2 RUN mode
In the RUN mode
 the measurement values for flow (in l/min, scfm or l/h)
 the measurement values for air consumption (in m´, scf or l) and
 the signal states of the switch outputs Out A, Out B (set, not set) are displayed.
Note
A flashing value means:
 measurement outside the permitted measuring range or
 incorrectly connected hoses èchapter 4.2 Pneumatic connection
5.3 SHOWmode
In the SHOW mode, the current settings for the switching outputs Out A and Out B
are displayed.
The SFAB must be in the RUN mode.
· Pressing the A button (switching output Out A) or the B button (switching output
Out B) starts the SHOW mode for the respective switching output.
Note
If there are faults, pressing the A button / B button first displays corresponding
fault numbers.
· Repeated pressing of the A button/B button displays the settings of the
respective switching output one after another.
· When all settings have been displayed, the SFAB goes back into the RUN mode
when the A button/B button are pressed again and displays the current
measurement value for the corresponding output.
As a result, the displays can also be changed via the SHOW mode to switch
between the displayed measurement values, such as with a combination of air
consumption measurement and flow measurement.

Fig.13
The following settings are displayed for OUT A:
With flow measurement [FLW]:
 the switching function (threshold value or window comparator)
 switching point [SP], switching points [SP.Lo] and [SP.Hi]
 hysteresis [Hy]
 switching element function [no/nc] (closer/opener)
 minimum flow value [F.Lo] (Flow Low).
In order to delete the minimum value, press the EDIT button briefly.
 maximum flow value [F.Hi] (Flow High).
In order to delete the maximum value, press the EDIT button briefly.
With air consumption measurement [ConS]:
 air consumption switching impulse [CI]
 switching element function [no/nc] (closer/opener)
 minimum flow value [F.Lo] (Flow Low).
In order to delete the minimum value, press the EDIT button briefly.
 maximum flow value [F.Hi] (Flow High).
In order to delete the maximum value, press the EDIT button briefly.
The following settings are displayed for OUT B:
 the switching function (threshold value or window comparator)
 switching point [SP], switching points [SP.Lo] and [SP.Hi]
 hysteresis [Hy]
 switching element function [no/nc] (closer/opener)
 colour change status [bLUE/rON/rOFF]
 minimum flow value [F.Lo].
In order to delete the minimum value, press the EDIT button briefly.
 maximum flow value [F.Hi].
In order to delete the maximum value, press the EDIT button briefly.
5.4 EDIT mode
Fig.14

The EDIT mode enables the following settings:
 switching mode for Out A (air consumption [ConS] or flow [FLW] )
 switching function (threshold−value or window comparator for Out A and Out B)
 switching points [SP] for Out A and Out B
 air consumption switching impulse [CI] only for OutA in the switching mode
[ConS]
 hysteresis [Hy] for Out A and Out B
 switching element function [no/nc] for Out A and Out B
 colour change of the display from blue to red for flow mode (for Out B).
Special menu with following settings:
 changeover of the standard conditions via [Option] (OFF, 1, 2)
 physical units for flow [FLW] (l/h, scfm, l/min)
 analogue filter [AnA.F]
 digital filter [dIG.F]
 physical units for air consumption [ConS] (m3, scf, l)
 switching output [nPn/PnP]
 security code [Lock].
Starting EDIT mode
Warning
Depending on the functioning of the machine/system, manipulation of signal
states may cause serious personalinjury.
· Note that if the switching status of the outputs is modified in the EDIT mode,
the new status will be effective immediately.
Various settings can be selected with the operating keys (A/B button).
 switching output for which the behavior is to be set
 special menu.
1. Press the Edit button.
The EDIT mode is active and [Out A] flashes or flashes when the security lock
is active [Lock].
2. Press the A/B buttons until the chosen security code is set.
3. Press the Edit button.
The EDIT mode is active and [Out A] flashes.
Setting switching behaviour of the switch outputs
Both switch outputs (Out A/Out B) can be set for flow measurement. Alternatively,
switching output Out A can be set for the accumulated air consumption measure
ment. The combination of accumulated air consumption measurement (Out A) and
flow measurement (Out B) is possible.
a) Setting switching function for flow measurement
Note
The process for setting the switch outputs is fundamentally the same. Addition
ally, the switching mode [FLW] must be selected for Out A, since Out A can also
be configured for air consumption measurement. For Out B, the colour change
for the display can also be set.
In the following, the process is described using the switching output Out A.
The SFAB is in the EDIT mode and [Out A] flashes, èStart EDIT modesection.
·Toset Out A, proceed as follows:
1. Press the Edit button to confirm the selection.
[FLW] or [ConS] flashes.
2. Select the flow measurement (FLW) with the A/B buttons.
3. Press the Edit button to confirm the selection.
The currently set switching function flashes.
4. Select the desired switching function with the A/B buttons.
5. Press the Edit button to confirm the selection.
[SP] or [SP.Lo] flashes.
6. Set the switching point (SP or SP.Lo) with the A/B buttons.
7. Press the Edit button to confirm the set value.
Only with Window comparator switching function.
[SP.Hi] flashes.
· Set the value (SP.Hi) with the A/B buttons.
· Press the Edit button to confirm the set value.
[Hy] flashes.
8. Set the value for the hysteresis (Hy) with the A/B buttons.
9. Press the Edit button to confirm the set value.
[no] or [nc] flashes.
10. Select the switching element function (no/nc) with the A/B buttons.
11. Press the Edit button to confirm the set value.
The SFAB is in the RUN mode.
Carry out a test run with various flows to ascertain whether the SFAB switches as
desired (switching points and hysterisis).
b) Setting switching function for air consumption measurement
The SFAB is in the EDIT mode and [Out A] flashes, èStart EDIT modesection.
1. Press the Edit button to confirm the selection.
[FLW] or [ConS] flashes.
2. Select the flow measurement (ConS) with the A/B buttons.
3. Press the Edit button to confirm the selection.
[CI] flashes.
4. Set the value for the air consumption impulse (CI) with the A/B buttons.
5. Press the Edit button to confirm the set value.
[no] or [nc] flashes.
6. Select the switching element function (no/nc) with the A/B buttons.
7. Press the Edit button to confirm the set value.
The SFAB is in the RUN mode.
Carry out a test run with various flows to ascertain whether the SFAB switches as
desired (switching points and hysterisis).
Setting colour change (only for Out B)
With the SFAB, you can set a colour change in the display for the flow measure
ment at the output OutB dependent on the switching point. As a result, you can
visualise the equipment condition over a large distance. If the switching threshold
is exceeded or fallen below, the colour of the display changes. The following set
tings can be chosen:
r.ON = Display is red when the switching output is High(1).
Display is blue when the switching output is Low(0).
r.OFF = Display is red when the switching output is Low(0).
Display is blue when the switching output is High(1).
bLUE = Display is blue; the function colour change is switched off.
Colour change
for r.ON for r.OFF with bLUE
blue red red blue blue
Fig.15
The SFAB is in the EDIT mode and [Out A] flashes, èStart EDIT mode section.
·Toset the colour change, proceed as follows:
1. Press the B button.
[Out B] flashes.
2. Press the Edit button to confirm the selection.
3. Press the Edit button several times until [rON], [rOFF] or [bLUE] flashes in the
display.
4. Select the desired setting (rON, rOFF or bLUE) with the A/B buttons.
5. Press the Edit button to confirm the selection.
The SFAB is in the RUN mode.
Setting special menu [SPEC]
The following settings can be undertaken in the special menu:
 standard conditions
 physical units for flow (l/h, scfm or l/min)
 analogue filter [AnA.F] with filter time constants in ms
 digital filter [dIG.F] with smoothing in 7 steps for display and switching output
 physical units for air consumption (m3, scf or l)
 selection of the switching output [PnP] or [nPn]
 removal of security blocking [Lock] with security code.
This is how you reach the special menu:
The SFAB is in the EDIT mode and [Out A] flashes, èStart EDIT modesection.
1. Press the A or B button until the menu (SPEC) is selected.
[SPEC] flashes.
2. Press the Edit button to confirm the selection.
[Option] flashes, the standard conditions (OFF, 1 or 2) can be set.

a) Setting standard conditions
The air mass stream measured and output from the SFAB refers to standard
conditions. The SFAB is calibrated at the factory to the physical standard
conditions in accordance with DIN 1343.
Note
Switchover of the standard condition refers only to the display and switch
outputs. The analogue value at the analogue output still refers to DIN 1343 and
must be converted.
· Multiply the limit value of the sensor’s flow measurement range èFig.23
corresponding to your setting for the standard conditions by the specified
correction factor èFig.16.
· Note that the limit value of the analogue output refers to the thus−determined
limit value of the measurement range and the transmission function at the
analogue output thus changes.
The following standard conditions can be selected under the point [Option].
Option Off 1 2
Standard litres as per DIN 1343 ISO 2533 ISO 6358
Air humidity [%] 0 0 65
Air pressure (absolute) [bar] 1.01325 1.01325 1
Temperature [°C] 0 15 20
Correction factor, measurement range
limit value
1 1.055 1.087
Fig.16
3. Select the desired setting (OFF, 1 or 2) with the A/B buttons.
4. Press the Edit button to confirm the selection.
[FLW] is displayed and the currently chosen value flashes.
The unit for the flow (l/h, scfm or l/min) can be set.
b) Setting the physical unit for the flow
Note
For the types SFAB−600U and SFAB−1000U, the unit l/h cannot be set due to
displayability.
5. Select the desired setting (l/h, scfm or l/min) with the A/B buttons.
6. Press the Edit button to confirm the selection.
[AnA.F] with the currently set value is displayed.
The analogue filter can be set.
Note
The configured physical unit is shown in the RUN mode in the display at the
bottom right.
c) Setting filter time constants for the analogue filter
With the analogue filter, the rise time (filter time constants) of the analogue output
can be changed (default value = 60 ms).
7. Choose the value for the filter time constants (15 ms, 30 ms, 60 ms, 125 ms,
250 ms, 500 ms or 999 ms) with the A/B buttons.
8. Press the Edit button to confirm the set value.
[dIG.F] with the currently chosen value flashes. The digital filter can be set.
d) Setting smoothing for the digital filter
The display values can be smoothed with the digital filter. The degree of smoothing
can be set in 6 steps from d1 = lowsmoothing to d6 = maximumsmoothing. With
increasing smoothing, the switch−on/switch−off time of the switch outputs rises.
With d.OFF, the response time of the analogue output equals the set response
time.
Signal flow from the analogue filter and digital filter
Sensor
Raw signals Analogue filter
Digital filter Display
Switching
outputs
Out A/Out B
Analogue output
Fig.17
Note
A high filter time constant and high smoothing can result in a response time of
several seconds.
9. Select the value for dampening (d1 to d6 or d.OFF) with the A/B buttons.
10. Press the Edit button to confirm the set value.
[ConS] is displayed and the currently chosen value flashes.
The unit for the air consumption (m3, scf or l) can be set.
e) Setting the physical unit for the flow
11. Select the desired setting (m3, scfm or l) with the A/B buttons.
12. Press the Edit button to confirm the selection.
The currently set value [PnP] or [nPn] for the switching element output
flashes. The switching element output can be set.
f ) Setting switching element output
The two switching outputs can be set through the integrated push/pull stage as a
plus switch (PNP) or zero switch (NPN).
13. Select the desired setting (PNP or NPN) with the A/B buttons.
14. Press the Edit button to confirm the selection.
[Lock] flashes. The security code can be set.
g) Setting security code
To protect the setting from unauthorised access, a numerical code of up to 4 digits
can be set. The security code must be entered each time the settings are changed
(EDIT mode and TEACH mode).
Note
keep the security code in a safe place. If the security code is forgotten
èchapter 6.1 Resetting SFAB to factory setting.
15. Set the desired security code with the A/B buttons.
16. Press the Edit button to confirm the selection.
The SFAB is in the RUN mode.
5.5 TEACH mode
In the TEACH mode, the switching points can be learned.
Note
The process is the same for teaching the switching outputs Out A (A button) and
Out B (B button). In the following, the process is described using the switching
output Out A.
Fig.18

1. Before teaching in the EDIT mode, select the desired switching function
(threshold value or window comparator) èchapter 5.4. EDIT mode.
Thresholdcomparator Windowcomparator
The (taught) switching point is derived from
the average value of both measurement values
SP = 1/2 (Flow 1 + Flow 2)
Special case: SP = Flow 1 = Flow 2
The taught switching window is derived from
the measurement values:
SP.Lo = Flow 1
SP.Hi = Flow 2
Fig.19
For teaching the switching variables:
2. Generate a flow (Flow 1)
3. First press the A button and then also the Edit button.
[Out A] and bar display flash and the measurement value is taken over as the
first Teach point or [Lock] flashes if security blocking is active.
Only with active security blocking [Lock]:
4. Press the A/B buttons until the chosen security code is set.
5. Press the Edit button.
[Out A] and the bar display flash and the measurement value is taken over as
the first Teach point.
6. Generate a second flow (Flow 2)
7. First press the A button and then also the Edit button.
The second Teach point is taken over and the switching point (SP) or
switching points (SP.Lo and SP.Hi) become valid.
The SFAB is in the RUN mode.
5.6 RECORDER mode
Fig.20
In the RECORDER mode, a manual accumulated air consumption measurement can
be performed.
1. Press the A button and B button at the same time.
The SFAB is in the RECORDER mode.
The status of the air consumption measurement [Run] or [Stop] is displayed.
2. If [Stop] is displayed, press the A button.
[Run] with a running light is displayed. The air consumption measurement is
started.
3. Press the A button again.
[Stop] is displayed. The air consumption measurement is stopped.
4. Press the A button and B button at the same time.
The SFAB is in the RUN mode.
Note
If the RECORDER mode is left during an ongoing air consumption measurement
[Run], the air consumption measurement will continue in the background.
Resetting measurement value to zero.
· Press the B button in the RECORDER mode to reset a measurement value to
zero.
6 Operation
Important:
Excessive internal heat will destroy the SFAB.
· Avoid high cycle frequencies with large pressure amplitudes. Otherwise, the
admissible limit temperatures of the used materials will be exceeded.
The air mass stream displayed by the SFAB refers to the standard conditions that
were set under Options in the special menu.
When comparing volume flows:
· Make sure that the volume flows to be compared (e.g.operating volume flow,
amount supplied by a compressor, measured values of a flow sensor from
another manufacturer) refer to the same basic conditions.
· After the power supply is switched on, the SFAB needs a warm−up time of
5 minutes until it achieves the specified accuracy.
6.1 Resetting the SFAB to the factory settings
(also if the security code cannot be found)
Note
The current settings will be lost after a reset to the factory setting. If necessary,
make a note of these settings before a reset.
To reset the SFAB to factory setting, proceed as follows:
1. switch off the operating voltage
2. Press all three setting elements (A button + B button + Edit button)
simultaneously and hold them down.
3. Switch the operating voltage back on.
The SFAB is in the RUN mode.
7 Care and maintenance
· Switch off the following sources of energy before cleaning the exterior of the
device:
 the operating voltage
 the compressed air supply.
·Ifnecessary, clean the exterior of the SFAB.
Permitted cleaning agents are soap suds (max. +60 °C), petroleum ether and all
non−abrasive agents.
8 Dismantling
1. Switch off the following sources of energy before
dismantling:
 operating voltage
 compressed air.
2. Disconnect the respective connections from
the SFAB.
3. In the case of hat rail or wall fitting, remove
the SFAB as shown here.
4. With plate fitting: Loosen the two fastening
screws.
Fig.21
9 Eliminating faults
Fault Possible cause Remedy
Incorrect measurement
display
SFAB operated with
non−permitted medium
Operate SFAB only with
permitted media
display
SFAB contaminated Replace device
With flow measurement:
Measured value is
Measurement outside permitted
measuring range
Accuracy refers only to the
permitted measuring range
Measured
value
is
displayed flashing Incorrect flow direction Correct the tubing èchapter 4.2
With air consumption
measurement:
Measured value is
displayed flashing
Measuring range end value is
exceeded at least once. Specified
accuracy cannot therefore be
maintained.
Make sure that the measurement
range limit value is not exceeded
Outputs do not switch
according to the setting.
Short circuit/overload at relevant
output
Eliminate short circuit/overload
Settings cannot be
edited (Lock)
Access protection active Enter the security code
O.FLO Measurement range exceeded
(is displayed in the RUN mode)
Check operating conditions
Er1, Er2, Er3 Device defective Replace device
Er9 Measurement range fallen below
(is displayed in the RUN mode)
Check operating conditions
Er10 Measurement range exceeded
(is displayed in the RUN mode)
Check operating conditions
Er17 Undervoltage Maintain operating voltage
g
Check electrical wiring
Fig.22
10 Accessory
Select the appropriate accessories from our catalogue.
èwww.festo.com/catalogue/SFAB

11 Technical specifications
SFAB −10U −50U −200U −600U −1000U
General information
Certification C tick
CE symbol(è conformity declaration) to EU EMC directive
Note on materials RoHS−compliant
Input signal / Measurement element
Measured variable flow, air consumption
Direction of flow unidirectional P1 } P2
Measuring principle thermal
Flow measuring range [l/min] 0.1Ū10 0.5Ū50 2Ū200 6Ū600 10Ū1000
Operating pressure [bar] 0Ū10
Nominal pressure [bar] 6
Pressure drop [mbar] <100
Ambient temperature [°C] 0Ū50
Medium temperature [°C] 0Ū50
Nominal temperature [°C] 23
Operating medium air quality class 3:4:1
as per DIN ISO 8573−1
air quality class 5:4:3 as per
DIN ISO 8573−1
nitrogen nitrogen
Output, general 1) 2)
Accuracy, zero point ±FS [%] 0.3
Accuracy range ±FS [%] 3
Repeat accuracy,
zero point ±FS
[%] 0.2
Repeat accuracy,
zero point ±FS
[%] 0.8
Temperature coefficient
range ±FS/K
[%] ≤0.1
Pressure−dependence range
±FS/bar
[%] 0.5
Switching output
Switching output 2x PNP or 2x NPN, adjustable
Switching symbols Window comparator or threshold−value comparator,
adjustable
Switching element function NC or NO contact adjustable
Max. output current [mA] 100
Voltage drop [V] max. 1.5
Switch−on time [ms] adjustable (Factory setting: approx. 80 ms)
Switch−off time [ms] adjustable (Factory setting: approx. 80 ms)
Inductive protective circuit adapted to MZ, MY, ME coils
Analogue outputs
Characteristic flow rate curve [l/min] 0Ū10 0Ū50 0Ū200 0Ū600 0Ū1000
Output characteristics curve,
current
[mA] 4Ū20
Output characteristics curve,
voltage
[V] 0Ū10
Max. load resistance at
current output
[Ohm] 500
Min. load resistance at
voltage output
[kOhm] 10
Rise time [ms] 15, 30, 60 (factory setting), 125, 250, 500, 999
adjustable
Output, additional data
Protection against short
circuit
yes
Protection against
overloading
yes
Electronics
Operating voltage range DC [V] 15Ū30
Protection against polarity
reversal
for all electrical connections
Electromechanics
Electrical connection straight plug, M12x1, 5−pin
Max. length of connecting
cable
[m] <10
SFAB −10U −50U −200U −600U −1000U
Mechanical components
Temperature dependency of
the throttle setting3) ±FS
(0Ū50°C)
[%] 8 8 2  
Assembly position as desired
Pneumatic connection QS6 QS6   
QS8 QS8 QS8  
QS10 QS10 QS10 QS10 QS10
QS12 QS12 QS12 QS12 QS12
QS¼QS¼  
QSÄQSÄQSÄ 
QSyQSyQSyQSyQSy
Product weight [g] 160
Material of housing reinforced polyamide
Display / operation
Type of display illuminated LCD, blue
Presentable units l/min, l/h, scfm, l, m3, scf l/min, scfm, l, m3, scf
Setting range, threshold
value, flow
1 % FS Ū100 % FS
Setting range, threshold
value, consumption impulse
[l] 0.1 Ū
1999.9
0.2 Ū
1999.9
1 Ū
1999.9
2 Ū
1999.9
3 Ū
1999.9
value,
consumption
impulse
[m3] 0.01 Ū199.99 0.1 Ū
1999.9
1 Ū
19999
[scf ] 0.01 Ū199.99 0.03 Ū
199.99
0.1 Ū1999.9
Hysteresis setting range 0 % FS Ū90 % FS
Immission / emission
Storage temperature [°C] 20 Ū+80 (characteristic −D: 10 Ū+60)
Protection class IP65
Protection type III
1) Accuracy under rated conditions (6 bar, 23 °C, horizontal mounting position)
2) % FS = % of the measurement range limit value (full scale)
3) The flow value set with the throttle also depends on the operating pressure. As a result, the flow value
changes when the operating pressure changes, even when the throttle setting stays the same.
Fig.23