IFM SDG 50 Series User manual

Operating instructions
Flow meter compressed air
SDGx50
11429029 / 00 09 / 2021
GB

SDGx50 Flow meter compressed air
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Contents
1 Preliminary note ............................................................. 4
1.1 Symbols used.......................................................... 4
1.2 Warnings used ......................................................... 4
2 Safety instructions............................................................ 5
3 Getting started .............................................................. 6
3.1 Device function with factory setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Intended use................................................................ 7
4.1 Application area ........................................................ 7
5 Function ................................................................... 8
5.1 Output OUT1 selection options............................................. 8
5.2 Output OUT2 selection options............................................. 8
5.3 Switching output........................................................ 8
5.4 Analogue output........................................................ 9
5.5 Consumed quantity monitoring (totaliser function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.5.1 Totaliser reset...................................................... 10
5.5.2 Consumed quantity monitoring via pulse signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.5.3 Consumed quantity monitoring via switching signal . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.6 Measured value damping................................................. 11
5.7 Low flow cut-off......................................................... 11
5.8 Simulation............................................................. 11
5.9 Display colour setting .................................................... 12
5.10 IO-Link ............................................................... 12
5.10.1 Additional functions via IO-Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Mounting................................................................... 14
6.1 Installation location...................................................... 14
6.2 Interference............................................................ 14
6.3 Orientation ............................................................ 15
6.4 Process connection...................................................... 15
6.5 Inserting the sensor into the pipe section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Electrical connection.......................................................... 17
8 Operating and display elements................................................. 18
9 Menu...................................................................... 19
9.1 Menu overview......................................................... 19
9.1.1 Adjustable parameters ............................................... 19
9.2 Main menu and submenus ................................................ 21
10 Set-up..................................................................... 25
11 Parameter setting............................................................ 26
11.1 Parameter setting in general............................................... 26
11.2 Presets............................................................... 26
11.2.1 Process value for OUTx .............................................. 26
11.2.2 Standard unit of measurement ......................................... 27
11.3 Setting the output functions................................................ 27
11.3.1 Limit monitoring OUTx/ hysteresis function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11.3.2 Limit monitoring OUTx/ window function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11.3.3 Analogue signal OUT2 ............................................... 27
11.3.4 Pulse signal OUTx .................................................. 27
11.3.5 Switching signal totaliser OUTx. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.4 Totaliser reset.......................................................... 28
11.4.1 Manual reset....................................................... 28
11.4.2 Time-controlled reset ................................................ 28
11.4.3 Reset via external signal.............................................. 28
11.4.4 Switch off reset..................................................... 28
11.5 User settings (optional)................................................... 29
11.5.1 Standard display.................................................... 29
11.5.2 Standard unit of measurement ......................................... 29

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11.5.3 Display colour setting ................................................ 29
11.5.4 Output logic........................................................ 30
11.5.5 Measured value damping ............................................. 30
11.5.6 Low flow cut-off..................................................... 30
11.5.7 Standard conditions ................................................. 30
11.5.8 Zero-point calibration pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.5.9 Switch-on /switch-off delay............................................ 30
11.5.10Error behaviour of the outputs.......................................... 30
11.5.11Lock / unlock....................................................... 31
11.5.12Factory reset....................................................... 31
11.6 Diagnostic functions ..................................................... 31
11.6.1 Reading minimum values / maximum values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11.6.2 Simulation......................................................... 32
12 Operation .................................................................. 33
12.1 Process value display.................................................... 33
12.2 Reading the parameter setting ............................................. 33
13 Technical data............................................................... 34
14 Troubleshooting ............................................................. 35
14.1 Error messages......................................................... 35
14.2 Warning messages...................................................... 35
15 Maintenance, repair and disposal................................................ 37
15.1 Maintenance........................................................... 37
15.2 Repair................................................................ 37
15.3 Disposal .............................................................. 37
16 Factory settings.............................................................. 38

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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
Instructions
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.

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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 architect 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.
• The product must be suitable for the corresponding applications and environmental conditions
without any restrictions.
• Only use the product for its intended purpose (Ò Intended use).
• Only use the product for permissible media.
• 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.

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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
Output OUT1 • Switching signal for flow:
– hysteresis function normally open, PnP
– SP1 = 20 %, rP1 = 19 % 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
Display • Font colour black/white
• Refresh rate: Low
• Display rotation: 0°
• Display brightness: 75%
• Standard display: current process value for flow, temperature and pressure
• Standard unit of measurement for flow: m3/h
More information Ò Factory setting.

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4 Intended use
The unit monitors the standard volume flow of compressed air in industrial use.
It detects flow velocity, volume flow (flow quantity/time), consumed quantity, medium temperature and
pressure.
4.1 Application area
The unit is designed for use in compressed air systems in industrial use.
All indications apply to standard volume flow to DIN ISO 2533, i.e. volume flow at 1013mbar (101.3
kPa), 15 °C and 0 % relative air humidity. The unit can be set to different standard conditions.
Electromagnetic compatibility (EMC):
This is a class A product. This product may cause radio interference in domestic areas:
uIf required, take appropriate EMC screening measures.
Pressure Equipment Directive (PED):
The units comply with the Pressure Equipment Directive. They are designed for group 2 fluids
and manufactured and tested according to Module A. Use of media from group 1 fluids on
request.

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5 Function
• The unit detects flow based on the calorimetric measuring principle.
• As additional process values the unit also detects the medium temperature and the pressure.
• The unit has an IO-Link interface.
• The unit displays the current process values.
• The unit has many self-diagnostic options.
• A simulation mode allows simplified set-up of the sensor.
• The unit generates two output signals according to the parameter setting.
5.1 Output OUT1 selection options
• Switching signal flow
• Switching signal temperature
• Switching signal pressure
• Switching signal totaliser
• Pulse signal totaliser
• IO-Link
• OFF (output switched to high impedance)
5.2 Output OUT2 selection options
• Switching signal flow
• Switching signal temperature
• Switching signal pressure
• Switching signal totaliser
• Analogue signal flow
• Analogue signal temperature
• Analogue signal pressure
• Input for external totaliser reset
• OFF (output switched to high impedance)
5.3 Switching output
OUTx changes its switching status if it is above or below the set switching limits. Hysteresis or window
function can be selected.

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SP
t
Hno
HY
Hnc
rP
1
0
1
0
1
Fig.1: Hysteresis function
1: Process value
t: Time
SP: Set point
rP: Reset point
HY: Hysteresis
Hno: Hysteresis function NO (normally open)
Hnc: Hysteresis function NC (normally closed)
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.
FE FE
FH HY
HY
t
Fno
Fnc
FL
1
0
1
0
1
Fig.2: Window function
1: Process value
t: Time
FH: Upper limit value
FL: Lower limit value
HY: Hysteresis
FE: Window area
Fno: Window function NO (normally open)
Fnc: Window function NC (normally closed)
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 helps keep the switching status of the output stable if the flow rate varies slightly.
The switching signal in case of a fault can be set via the parameter [FOU].
5.4 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.
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 an error, messages are displayed (cr.UL,
UL, OL, cr.OL, Err).
The analogue signal in case of a fault can be set via the parameter [FOU].

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2
1
MEW
M
A
W
AE
P
AS
P
Q
[% MEW]
[°C]
T
-24
-10
60
74
81
-31
[°F]
-
1
1
14
140
161
178
-24
[bar]
P
0
-1
16
20
120
100
0
130
4
3,8
3,5
FOU=OFF
20
20,5
21,5
[mA]
FOU=On
6
c
r
.U
L
U
L
O
L
c
r
.O
L
3
4
5
Fig.3: Characteristics of the analogue output according to the standard IEC 60947-5-7
1: Analogue signal MAW: Initial value of the measuring range (with setting of low flow cut-off for Q:
signal output starting at MAW + LFC)
2: Process value MEW: Final value of the measuring range
3: Detection zone ASP: Analogue start point
4: Display range AEP: Analogue end point
5: Measuring range UL: Below the display range
6: Scaled measuring range OL: Above the display range
Q: Flow cr.UL: Below the detection zone (error)
P: Pressure cr.OL: Above the detection zone (error)
T: Temperature
5.5 Consumed quantity monitoring (totaliser function)
The unit has an internal totaliser. The totaliser continuously sums up the consumed quantity and
provides this process value both on the display and via the IO-Link interface.
In addition the value before the last reset is saved. This value and the time since the last reset can
also be displayed.
The totaliser saves the totalled volumetric flow quantity every 10 minutes. After a power failure
this value is available as the current meter reading. If a time-controlled reset is set, the elapsed
time of the set reset interval is also saved. This means that the possible data loss can be
maximum 10 minutes.
Pulse signals or a switching signal can be used to monitor the consumed quantity.
The accuracy of the consumed quantity measurement depends on the accuracy of the volumetric flow
measurement.
OUT1 and OUT2 cannot be used simultaneously for the consumed quantity monitoring.
5.5.1 Totaliser reset
There are different ways to reset the totaliser:
• Manual reset
• Time-controlled reset
• Reset via external signal
• Reset via the IO-Link interface
If the totaliser is not reset by applying one of the above-mentioned methods, an automatic reset is
made when the maximum display range is exceeded.

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5.5.2 Consumed quantity monitoring via pulse signals
Every time the volumetric flow quantity (pulse value) set under [ImPS] has been reached, the output
provides a pulse signal.
The pulse signal consists of a short switching on and off of the output. The switching status LEDs on
the unit do not display the switching operation.
Pulse signals are not available via the IO-Link interface.
5.5.3 Consumed quantity monitoring via switching signal
When the volumetric flow quantity set under [ImPS] has been reached, the output provides a switching
signal. The output remains switched until a reset is carried out. When the totaliser has been reset,
metering starts again.
By setting [rTo] it is defined when the output switches and when the totaliser is reset:
[rTo] Output Totaliser reset
OFF The output switches when the volumetric flow quan-
tity set under [ImPS] is reached.
uCarry out a manual reset.
• Automatic reset when the maximum display
range is exceeded.
1, 2,... h
1, 2,... d
1, 2,... w
The output switches only if the volumetric flow quan-
tity set under [ImPS] is reached within the set time.
When the output is not switched:
• Time-controlled reset (the time set under rTo is
exceeded).
When the output is switched:
uCarry out a manual reset.
• Automatic reset when the maximum display
range is exceeded.
The maximum display range is reached at a consumed quantity of 100 000 000 m³.
5.6 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.
The measured value damping only has an effect on the flow and pressure measurement.
dAP.F = measured value damping for the flow
dAP.P = measured value damping for the pressure
5.7 Low flow cut-off
With the function low flow cut-off [LFC] it is possible to suppress small volumetric flow quantities.
Volumetric flow below the LFC value is evaluated by the sensor as standstill (Q = 0).
5.8 Simulation
When the simulation is started, the values of the totaliser are frozen and the simulated totaliser is set
to 0. The simulated flow value then has an effect on the simulated totaliser. When the simulation is
ended, the initial totaliser values are restored.

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During the simulation:
• The simulation has no effect on the current process values. The outputs operate as previously set.
• The original totaliser value remains saved without any changes even if there is a real flow.
• No error messages of the current application are available. They are suppressed by the simulation.
The following values can be simulated:
Flow, temperature, pressure and meter reading of the totaliser.
5.9 Display colour setting
The colour of the characters in the display can be set via the parameter [coL.x]:
• Permanent definition of the display colour:
– bk/wh (black/white)
– yellow
– green
– red
• Colour change from red to green or vice versa:
– r-cF (red display colour between the limits cFL...cFH)
– G-cF (green display colour between the limits cFL...cFH)
cFL cFH
MAW MEW
Fig.4: Colour change in the window
section
cFL: Lower limit value
cFH: Upper limit value
MAW: Initial value of the measuring range
MEW: Final value of the measuring range
The limits can be freely selected within the measuring range and are independent of the output
function set for OUT1 and OUT2.
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.
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.
• Display of error and event messages.
• Paperless logging of parameter sets, process values and diagnostic information.

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• Evaluation of the process values and diagnostic data via IO-Link master.
• Simultaneous reading of all process values and the binary switching signals.
5.10.1 Additional functions via IO-Link
The following functions are only available via the IO-Link interface by means of a parameter setting
software:
• Electronic lock as protection against tampering
• Localisation of the sensor via [Flash On / Flash Off]. When activated:
– Switching status LEDs flashing.
– Display indicates “IO-Link” (green, flashing)

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6 Mounting
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.
uApply the supplied warning label to the sensor cable.
uEnsure that the system is free of pressure during installation.
uThe rules and regulations for the installation and operation of compressed air equipment
must be observed.
6.1 Installation location
uInstall the unit downstream of the cold dryer.
uInstall the unit near the load.
uThe unit can be installed downstream of a maintenance unit.
uIf oil is used for the loads: Install the unit upstream of the oiler.
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.
Interference Distance to the sensor
changes to the pipe diameter 10 x pipe diameter
90° elbow 10 x pipe diameter
two 90° elbows, one plane 15 x pipe diameter
two 90° elbows, two planes 25 x pipe diameter
valve, slide 40 x pipe diameter
Shut-off valves and control devices are not allowed directly in front of the unit.
uAvoid diameter changes between the inlet pipe length and the unit. If a diameter change cannot be
avoided, make sure that the diameter of the inlet pipe length is greater than the diameter at the
unit.

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6.3 Orientation
F
F
1 2 3
4
Fig.5: Orientation of the pipe length and the unit
1: Pipe length vertical, any unit position
2: Pipe length horizontal, unit vertical
3: Pipe length left (with plug facing the rear), unit on side
4: Avoid: pipe length right (with plug facing the rear), unit on side
F: Direction of flow
6.4 Process connection
2 3 4 51
IN OUT
Fig.6: Process connection
uLoosen the screws (1) on the flanges.
uRemove the flanges (2) from the measuring section (4).
uRemove the seals (3) from the flange slots.
uWeld the flanges into the pipe.
The welding operation must be carried out by authorised personnel.
In order to prevent a dissimilar metal weld, pipe and flange must be of the same material.
uWeld the flanges without distortion.
After welding:
uLet the pipe and flanges cool down.
uRemove any welding residues from the welding seams.
The inner surface of the pipe must be free from burrs so that the measurement accuracy is not
impaired.
uInsert the seals into the flange slots.
The slot must be clean and free from welding residues.

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uInsert the measuring length so that the flow direction and the arrow (5) show in the same direction.
uInsert the screws and tighten.
6.5 Inserting the sensor into the pipe section
1
2
3
uRemove the protective cover from the measuring probe of the sensor
(1).
uInsert the sensor into the measurement connection (2).
uAlign the sensor: parallel to the pipe section, connector in the
direction of the arrow on the pipe section.
uTighten the coupling nut (3). Tightening torque max. 50 Nm. When
doing so, keep the position of the sensor.

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7 Electrical connection
The device must be connected by a qualified electrician.
Observe the national and international regulations for the installation of electrical equipment.
Voltage supply according to EN50178, SELV, PELV.
uDisconnect power.
uConnect the unit as follows:
L
1 BN
2 WH
4 BK
3 BU
OUT1/IO-Link
OUT2
L+
43
2 1
Fig.7: Wiring diagram (colours to DINEN60947-5-2)
BK: black BN: brown
BU: blue WH: white
Pin Assignment
1 L+
3 L-
4 (OUT1) • Switching signal flow
• Switching signal temperature
• Frequency signal flow
• Frequency signal temperature
• IO-Link
2 (OUT2) • Switching signal flow
• Switching signal temperature
• Analogue signal flow
• Analogue signal temperature
1
L
1
BN
2
WH
4
BK
3
BU
L+
2
L
1
BN
2
WH
4
BK
3
BU
L+
4
L
1
BN
4
BK
2
WH
3
BU
L+
3
L
1
BN
2
WH
4
BK
3
BU
L+
Fig.8: Circuit examples
1: 2 x positive switching
2: 2 x negative switching
3: 1 x positive switching / 1 x analogue
4: 1 x negative switching / 1 x analogue

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8 Operating and display elements
2
3
4
1
Fig.9: Operating and display
elements
1: Switching status LED for OUT1
2: Switching status LED for OUT2
3: TFT display
4: Keys for changing views and parameter setting
Display illumination:
Unit temperature >70 °C: brightness automatically reduced.
Unit temperature ≥ 100 °C: display automatically switched off.

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9 Menu
9.1 Menu overview
Use the operating keys to navigate from the process value display to the main menu and from there to
the submenus.
Process value display
Main menu
Extended functions
[EF]
Min/max memory [MEM]
Display settings [DIS]
Output 1 [OUT1]
Basic settings [CFG]
Output 2 [OUT2]
Display colour [COLR]
Simulation mode [SIM]
Fig.10: Menu overview (display)
9.1.1 Adjustable parameters
Parameter Explanation
AEPx Analogue end point for OUTx = process value at which the output signal is 20 mA.
ASPx Analogue start point for OUTx = process value at which the output signal is 4 mA.
CFG Change to the submenu CGF (basic settings)
cFH.F Upper limit value for colour change (flow)
cFH.P Upper limit value for colour change (pressure)
cFH.T Upper limit value for colour change (temperature)
cFL.F Lower limit value for colour change (flow)
cFL.P Lower limit value for colour change (pressure)
cFL.T Lower limit value for colour change (temperature)
coF Correction factor for zero point calibration
coL.F Font colour for flow
col.P Font colour for pressure
col.T Font colour for temperature
col.V Font colour for totaliser indication
COLR Change to the submenu COLR (display colour setting)
dAP.F Damping time in seconds for flow measurement

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Parameter Explanation
dAP.P Damping time in seconds for pressure measurement
DIn2 Totaliser reset via external signal
DIS Change to the submenu DIS (display settings)
diS.B Brightness of the display
diS.L Standard process value of the display
diS.R Orientation of the display
diS.U Refresh rate of the display
drx Switch-off delay for switching output OUTx in seconds
dSx Switch-on delay for switching output OUTx in seconds
EF Change to the submenu EF (extended functions)
FHx Upper limit value for switching output with window function
FLx Lower limit value for switching output with window function
FOUx Behaviour of output OUTx in case of an error
Hi.F Maximum flow value measured (flow volume or flow velocity)
Hi.P Maximum pressure value measured
Hi.T Maximum temperature value measured
ImPRx Totaliser function: pulse signal (ImPR = YES) or switching signal (ImPR = NO)
ImPSx Pulse value (= flow value at which 1 pulse is provided)
Info Display of the device information
LFC Low flow cut-off (= flow value below which flow is evaluated as standstill)
Lo.F Minimum flow value (flow volume or flow velocity)
Lo.P Minimum pressure value
Lo.T Minimum temperature value
MEdi Selection of the medium to be monitored
MEM Change to the submenu MEM (memory)
OUTx Change to the submenu OUTx (output configuration)
oux Output configuration for output OUTx (e.g. switching output with hysteresis function)
P-n Output logic
rEF.P Standard pressure as environmental condition
rEF.T Standard temperature as environmental condition
rES Reset to factory settings
rPx Reset point for switching output OUTx with hysteresis function
rTo Setting of the totaliser reset (manually or time-controlled)
S.FLW Simulated flow value in simulation mode
S.On Starts the simulation mode
S.PRS Simulated pressure value in simulation mode
S.Tim Duration of the simulation in minutes
S.TMP Simulated temperature value in simulation mode
SELx Process value for output OUTx
SIM Change to the submenu SIM (simulation mode)
SPx Switch point for switching output OUTx with hysteresis function
uni.F Standard unit of measurement for flow
uni.P Standard unit of measurement for pressure
uni.T Standard unit of measurement for temperature