IFM SAxx20 User manual

Operating instructions
Flow sensor
SAxx20
80295435 / 0011 / 2020
GB

2
Contents
1 Preliminary note ............................................................................................. 5
1.1 Symbols used ......................................................................................... 5
1.2 Warnings used ........................................................................................ 5
2 Safety instructions.......................................................................................... 5
3 Getting started ............................................................................................... 6
3.1 Device function with factory setting......................................................... 6
4 Functions and features .................................................................................. 7
4.1 Application area ...................................................................................... 7
5 Function ......................................................................................................... 7
5.1 Output OUT1 selection options............................................................... 7
5.2 Output OUT2 selection options............................................................... 7
5.3 Operating modes .................................................................................... 8
5.4 Calibration............................................................................................... 8
5.5 Switching output...................................................................................... 9
5.6 Analogue output...................................................................................... 11
5.7 Frequency output .................................................................................... 12
5.8 Measured value damping........................................................................ 14
5.9 Display colour setting.............................................................................. 14
5.10 IO-Link .................................................................................................... 15
5.10.1 IO-Link process values ..................................................................... 16
6 Installation...................................................................................................... 17
6.1 Process connection................................................................................. 17
6.2 Interference............................................................................................. 17
6.3 Installation position ................................................................................. 18
6.3.1 Immersion depth ............................................................................... 18
6.3.2 Recommended mounting position .................................................... 19
6.3.3 Conditionally possible installation position........................................ 19
6.3.4 Impermissible installation position .................................................... 20
6.3.5 Alignment.......................................................................................... 21
7 Electrical connection ...................................................................................... 21
8 Operating and display elements .................................................................... 23

3
9 Menu .............................................................................................................. 24
9.1 Menu overview........................................................................................ 24
9.2 Main menu and submenus...................................................................... 25
10 Set-up ............................................................................................................ 29
11 Parameter setting........................................................................................... 29
11.1 Parameter setting in general................................................................... 30
11.2 Presetting................................................................................................ 30
11.2.1 Process value for OUT2 ................................................................... 30
11.2.2 Operating mode ................................................................................ 30
11.2.3 Standard unit of measurement for flow............................................. 31
11.2.4 Internal pipe diameter ....................................................................... 31
11.2.5 Flow adjustment................................................................................ 31
11.2.6 Remote calibration............................................................................ 32
11.3 Setting the output functions .................................................................... 33
11.3.1 Limit monitoring OUTx/ hysteresis function ..................................... 33
11.3.2 Limit monitoring OUTx/ window function ......................................... 33
11.3.3 Frequency signal OUTx .................................................................... 33
11.3.4 Analogue signal OUT2...................................................................... 34
11.4 User settings (optional) ........................................................................... 34
11.4.1 Standard display ............................................................................... 34
11.4.2 Display colour setting........................................................................ 34
11.4.3 Output logic....................................................................................... 35
11.4.4 Measured value damping ................................................................. 35
11.4.5 Switch-on /switch-off delay ............................................................... 35
11.4.6 Error behaviour of the outputs .......................................................... 35
11.4.7 Calibration......................................................................................... 36
11.4.8 Lock / unlock..................................................................................... 36
11.4.9 Factory reset..................................................................................... 36
11.5 Diagnostic functions................................................................................ 37
11.5.1 Reading minimum values / maximum values ................................... 37
12 Operation ....................................................................................................... 37
12.1 Process value display ............................................................................. 37
12.2 Reading the parameter setting................................................................ 38
13 Technical data................................................................................................ 38
14 Troubleshooting ............................................................................................. 38
GB

4
14.1 Error messages....................................................................................... 39
14.2 Warning messages ................................................................................. 39
15 Maintenance, repair and disposal .................................................................. 40
16 Factory settings.............................................................................................. 40

5
1 Preliminary note
You will find instructions, technical data, approvals and further information using
the QR code on the unit / packaging or at www.ifm.com.
1.1 Symbols used
Requirement
Instruction
Reaction, result
[...] Designation of keys, buttons or indications
Cross-reference
Important note
Non-compliance may result in malfunction or interference
Information
Supplementary note
1.2 Warnings used
CAUTION
Warning of personal injury
wSlight reversible injuries may result.
2 Safety instructions
• The unit described is a subcomponent for integration into a system.
– The system architect is responsible for the safety of the system.
– The system creator undertakes to perform a risk assessment and to create
documentation in accordance with legal and normative requirements to be
provided to the operator and user of the system. This documentation must
contain all necessary information and safety instructions for the operator,
the user and, if applicable, for any service personnel authorised by the
architect of the system.
• Read this document before setting up the product and keep it during the entire
service life.
GB

6
• The product must be suitable for the corresponding applications and
environmental conditions without any restrictions.
• Only use the product for its intended purpose (Ò Functions and features).
• Only use the product for permissible media (Ò Technical data).
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur.
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the
product must be carried out by qualified personnel authorised by the machine
operator.
• Protect units and cables against damage.
3 Getting started
The unit has two configurable outputs for flow and temperature monitoring.
The process values and error messages can be read from the display.
All process values and messages are available via the IO-Link interface
irrespective of the output configuration.
3.1 Device function with factory setting
Factory setting
Operating mode • Relative flow measurement in % of the maximum flow
Output OUT1 • Switching signal for flow:
– hysteresis function normally open, PnP
– SP1 = 20 %, rP1 = 15 % of the final value of the measuring
range
• Measured value damping 0.6 seconds
• No switch-on /switch-off delay
• In case of a fault the output switches OFF
Output OUT2 • Analogue signal for flow (4…20mA; measuring range
unscaled)
• In case of a fault the analogue signal goes to 3.5 mA

7
Factory setting
Display • Red text colour
• Update of the measured values every 200 ms
• Standard display: flow
More information: (ÒFactory setting/40).
4 Functions and features
The unit monitors gaseous media.
It detects the process categories flow and medium temperature.
4.1 Application area
• Medium = air
In applications > 6 bar (> 600 kPa), flow range inaccuracies may occur due
to the natural convection of the air.
This is a class A product. This product may cause radio interference in
domestic areas.
uIf required, take appropriate EMC screening measures.
5 Function
• The unit detects flow based on the calorimetric measuring principle.
• As additional process value the unit detects the medium temperature.
• The unit has an IO-Link interface.
• The unit displays the current process values.
• The unit has many self-diagnostic options.
• The unit generates two output signals according to the parameter setting.
5.1 Output OUT1 selection options
• Switching signal flow
• Frequency signal flow
• IO-Link
5.2 Output OUT2 selection options
• Switching signal flow
GB

8
• Switching signal temperature
• Analogue signal flow
• Analogue signal temperature
• Frequency signal flow
• Frequency signal temperature
• Input for external teach signal (remote calibration)
5.3 Operating modes
The unit provides 2 selectable operating modes for flow measurement:
Operating mode
[ModE] Display unit
REL % of the taught range
GAS m/s, l/min, m3/h
The selected operating mode has no effect on the temperature measurement, only
absolute values in °C are indicated.
When [ModE] = GAS is selected:
uDefine the internal pipe diameter.
uIf required, calibrate curve of measured values.
When [ModE] = REL is selected:
uCarry out flow adjustment.
The parameter settings are saved in the respective operating mode, i.e.
when the operating mode is changed, the settings are not lost.
5.4 Calibration
Via the calibration factor [CGA] the sensor can be adjusted to a reference flow in
the application.
The customer-specific calibration allows changing the gradient of the curve of
measured values. It influences the display and the outputs.

9
140 % MEW
100 % MEW
60 % MEW
MEW Q
AV1
V0
V2
Fig.1: Calibration
A: Operating value for display and
output signals
Q: Flow
MEW: Final value of the measuring range
V: Curve of measured values at
factory setting
V1: Curve of measured values 1 after
calibration
V2: Curve of measured values 2 after
calibration
The change in the gradient is indicated in per cent.
Factory setting: CGA = 100%.
After a change the calibration can be reset to factory setting.
The parameter CGA is not available if [ModE] = REL is set.
Depending on the set CGA factor, it may not be possible to use the
complete measuring range.
5.5 Switching output
OUTx changes its switching status if it is above or below the set switching limits.
Hysteresis or window function can be selected.
GB

10
SP
rP
Fig.2: Hysteresis function
SP: Set point
rP: Reset point
HY: Hysteresis
Hno: Hysteresis function NO (normally
open)
Hnc: Hysteresis function NC (normally
closed)
t: Time
When the hysteresis function is set, the set point [SP] and the reset point
[rP] are defined. The rP value must be lower than the SP value. The
distance between SP and rP is at least 4 % of the final value of the
measuring range (= hysteresis). If only the set point is changed, the reset
point is changed automatically; the difference remains constant.
FL
FH
Fig.3: Window function
FH: Upper limit value
FL: Lower limit value
HY: Hysteresis
FE: Window
Fno: Window function NO (normally open)
Fnc: Window function NC (normally
closed)
t: Time

11
When set to the window function the upper limit value [FH] and the lower
limit value [FL] are defined. The distance between FH and FL is at least 4
% of the final value of the measuring range. FH and FL have a fixed
hysteresis of 0.25% of the final value of the measuring range. This keeps
the switching status of the output stable if the flow rate varies slightly.
5.6 Analogue output
The unit provides an analogue signal of 4…20mA proportional to the process
value.
The measuring range is scalable:
• [ASP] determines at which measured value the output signal is 4 mA.
• [AEP] determines at which measured value the output signal is 20 mA.
Minimum distance between ASP and AEP = 20 % of the final value of the
measuring range.
For flow measurement in the operating mode REL, ASP and AEP are not
available. In this operating mode, the characteristic curve of the analogue
output is defined by the flow adjustment: high flow = 20 mA; low flow = 4
mA.
If the measured value is outside the measuring range or in the event of an internal
error, the current signal indicated in the following figure is provided.
For measured values outside the display range or in case of a fault, messages are
displayed (UL, OL, Err).
(ÒThe analogue signal in case of an error is adjustable/35):
• [FOU] = On: In case of a fault the analogue signal goes to the upper end stop
value (22 mA).
• [FOU] = OFF: In case of a fault the analogue signal goes to the lower end stop
value (3.5 mA).
• [FOU] = OU: The analogue signal still corresponds to the measured value.
GB

12
MEW
MAW
AEPASP
Q
T-44 +124 [°C]
1200 130 [%MEW]
4
3,5FOU=OFF
20
21,5
22
[mA]
FOU=On
1
2
5
4
3
Err UL OL Err
Fig.4: Characteristics of the analogue output according to the standard IEC 60947-5-7
1: Analogue signal MAW: Initial value of the measuring range
2: Measured value MEW: Final value of the measuring range
3: Display range ASP: Analogue start point
4: Measuring range AEP: Analogue end point
5: Scaled measuring range UL: Below the display range
Q: Flow OL: Above the display range
T: Temperature Err: Error
5.7 Frequency output
The unit provides a frequency signal proportional to the process value.
The frequency signal is scalable:
• [FrPx] defines the frequency signal in Hz that is provided when the upper
measured value (MEW or FEPx) is reached.
The measuring range is scalable:
• [FSP2] defines the lower measured value from which a frequency signal is
provided.
– FSP2 is only available for temperature measurement.

13
• [FEPx] defines the upper measured value at which the output signal has the
frequency set under FrPx.
– FEPx is only available for flow measurement in the operating mode GAS.
Minimum difference between FSP2 and FEP2 = 20%of the final value of
the measuring range.
If the measured value is outside the measuring range or in the event of an internal
error, the frequency signal indicated in the following figure is provided.
For measured values outside the display range or in case of a fault, messages are
displayed (UL, OL, Err).
(ÒThe frequency signal in case of a fault is adjustable/35):
• [FOU] = On: In case of a fault the frequency signal goes to the upper end stop
value (130 % FrPx).
• [FOU] = OFF: In case of a fault the frequency signal goes to the lower end stop
value (0 Hz).
• [FOU] = OU: The frequency signal still corresponds to the measured value.
MEWFEPx
FrPx
=100%
0%
120%
1000 120 [
%MEW ]
130%
OL Err
1
2
5
4
3
FOU=On
FOU=OFF
UL
Err
Fig.5: Output characteristics frequency
output; flow
1: Frequency signal
2: Measured value
3: Display range
4: Measuring range
5: Scaled measuring range
MEW: Final value of the measuring range
FEPx: Frequency end point
FrPx: Frequency signal (Hz) for upper
measured value
OL: Above the display range
UL: Below the display range
Err: Error
GB

14
MEWMAW FEPx
FSPx
FrPx
=100%
120%
0%
130%
1
2
5
4
3
FOU=On
FOU=OFF
100 120[ %MEW ]
OL ErrUL
Err
Fig.6: Output characteristics frequency
output; temperature
1: Frequency signal
2: Measured value
3: Display range
4: Measuring range
5: Scaled measuring range
MAW: Initial value of the measuring range
MEW: Final value of the measuring range
FSPx: Frequency start point
FEPx: Frequency end point
FrPx: Frequency signal (Hz) for upper
measured value
OL: Above the display range
UL: Below the display range
Err: Error
5.8 Measured value damping
Use the damping time [dAP] to set after how many seconds the output signal has
reached 63 % of the final value if the measured value changes suddenly. The set
damping time stabilises the switching outputs, the analogue outputs, the display
and the process value transmission via the IO-Link interface.
The damping time is added to the response time of the sensor (Ò Technical data).
The signals UL and OL are defined under consideration of the damping time.
Measured value damping only has an effect on the measured variable flow.
5.9 Display colour setting
The (Òcolour of the characters in the display/34) can be set via the
parameter [coLr]. With the set parameters rED (red) and GrEn (green), the display
is permanently set to one colour. If the parameters rxou and Gxou are set, the
colour of the characters changes depending on the process value:
OUT1 OUT2 Colour change to…
Parameter setting r1ou r2ou Red
G1ou G2ou Green

15
When the hysteresis function is set, the colour changes if the process value is
above the set point:
SP1 /
SP2
MAW MEW
Fig.7: Hysteresis function
MAW: Initial value of the measuring range
MEW: Final value of the measuring range
SPx: Set point
When the window function is set, the colour changes if the process value is within
the window section:
FL1 /
FL2
FH1 /
FH2
MAW MEW
Fig.8: Window function
MAW: Initial value of the measuring range
MEW: Final value of the measuring range
FLx: Lower limit of the window section
FHx: Upper limit of the window section
5.10 IO-Link
This unit has an IO-Link communication interface which enables direct access to
process and diagnostic data. In addition it is possible to set the parameters of the
unit while it is in operation. Operation of the unit via the IO-Link interface requires
an IO-Link master.
With a PC, suitable IO-Link software and an IO-Link adapter cable,
communication is possible while the system is not in operation.
GB

16
The IODDs necessary for the configuration of the unit, detailed information about
process data structure, diagnostic information, parameter addresses and the
necessary information about the required IO-Link hardware and software can be
found at www.ifm.com.
The IO-Link interface provides the following functions using suitable hardware and
software:
• Remote parameter setting of the unit.
• Noise-immune signal transmission without measured value losses.
• Transmission of the parameter settings to a replaced unit or to other units of
the same type.
• Simultaneous reading of all process values and the binary switching signals.
• Comprehensive display of error and event messages.
• Evaluation of the process values and diagnostic data via IO-Link master.
• Paperless logging of parameter sets, process values and diagnostic
information.
• Additional parameters via IO-Link:
– electronic lock as protection against tampering
5.10.1 IO-Link process values
The process values for flow and temperature are transmitted via IO-Link in the
following units of measurement:
Operating mode [ModE] Flow unit Temperature unit
REL % °C
GAS m/s °C
A change of [uni] does not affect the IO-Link process values.
More information Ò IO Device Description at www.ifm.com.

17
6 Installation
CAUTION
If the medium temperature is above 50 °C (122 °F), parts of the
housing can increase in temperature to over 65 °C (149 °F).
wRisk of burns.
uProtect the housing against contact with flammable substances
and unintentional contact.
uEnsure that the system is free of pressure during installation.
uEnsure that no media can leak at the mounting location during
installation.
6.1 Process connection
Using process adapters the unit can be adapted to different process connections.
Adapters have to be ordered separately as accessories.
• Information about the available mounting accessories at www.ifm.com.
• A correct fit of the unit and ingress resistance of the connection are only
ensured using ifm adapters.
uObserve the instructions of the mounting accessories.
uUse a lubricating paste which is suitable and approved for the
application. Grease the threads of the process connection, adapter and
sensor. Ensure no grease is applied to the sensor tip.
uTake the tightening torques of sensor and fixing elements into account:
sensor25Nm; fixing element Ò Technical data sheet at www.ifm.com
6.2 Interference
Structures in the pipe, bends, valves, reducing pieces and the like affect the
function of the unit.
uAdhere to the distances between sensor and interference.
GB

18
S S
5...10 x D 3...5 x D
Fig.9: Inlet and outlet pipe lengths
D: Outside diameter of the pipe
S: Interference
6.3 Installation position
6.3.1 Immersion depth
≥15 mm
Fig.10: Immersion depth
The sensor tip must be completely surrounded by the medium.
Recommended immersion depths:
• With an internal pipe diameter (diA) < 120 mm: ~ 15 mm
• With an internal pipe diameter (diA) ≥ 120 mm: ~ ⅛ diA

19
6.3.2 Recommended mounting position
Fig.11: Recommended mounting position
• For horizontal pipes: mounting from the side.
• For vertical pipes: mounting in the rising pipe.
6.3.3 Conditionally possible installation position
Fig.12: Conditionally possible installation position
• For horizontal pipes, if the pipe is free from build-up: mounting from below.
• For horizontal pipes, if the pipe is completely filled with medium: mounting from
the top.
GB

20
6.3.4 Impermissible installation position
Fig.13: Impermissible installation position
• The sensor tip must not be in contact with the pipe wall.
• Do not mount in downpipes that are open at the bottom.