IFM SB4 Series User manual

Operating instructions
Mechatronic flow sensor
SBx4xx
11368300 / 0005 / 2021
GB

SBx4xx Mechatronic flow sensor
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Contents
1 Preliminary note.............................................................. 3
1.1 Symbols used........................................................... 3
1.2 Warnings used.......................................................... 3
2 Safety instructions............................................................ 4
3 Intended use ................................................................ 5
4 Function.................................................................... 6
4.1 Analogue output......................................................... 6
5 Mounting ................................................................... 7
5.1 Process connection ...................................................... 7
5.2 Interference ............................................................ 7
5.3 Mounting accessories..................................................... 8
5.4 Installation in case of water containing dirt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Electrical connection .......................................................... 9
7 Troubleshooting.............................................................. 10
8 Maintenance, repair and disposal ................................................ 11
8.1 Clean the device......................................................... 11

Mechatronic flow sensor SBx4xx
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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
ATTENTION
Warning of damage to property
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 Intended use
The unit monitors liquid media (water, glycol solutions, industrial oils, coolants).
It detects the volume flow (flow rate/time) and outputs an analogue signal that is proportional to the
process value.
ATTENTION
Frost formation of the medium.
wThe sensor may be damaged.
uEnsure that the medium in the sensor does not freeze during operation and transport.
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4 Function
The unit detects the flow according to the principle of differential pressure by means of a permanent
magnet and a measuring cell.
4.1 Analogue output
I [mA]
20
4
0
MEW Q [l/min]0
Fig.1: Analogue output (water 20
°C)
The analogue signal for water is linear from 4 mA (= no flow) to 20 mA
(= final value of the measuring range, VMR).
If the measured value is above the final value of the measuring range, a
current signal of > 20 mA is output.

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5 Mounting
CAUTION
During installation or in case of a fault (e.g. housing damage) media under high pressure or
hot media can leak from the system.
wRisk of injury caused by pressure or burns.
uEnsure that the system is free of pressure during installation.
uEnsure that no media can leak at the mounting location during installation.
uEquip the unit with suitable protection (e.g. cover) to avoid hazard to personnel from
leaking media.
5.1 Process connection
uAvoid major changes of cross section on the inlet side.
uFit the unit in the pipe in accordance with the flow direction (arrow) and tighten at the spanner flats.
Do not clamp the housing in a vice.
IN OUT
1
Fig.2: Process connection
IN: Inlet
OUT: Outlet
Loosening the socket head screw (1) and moving the cap do not change the setting of the
sensor. However, moving the cap may be useful to read the label.
Calming sections on the sensor's inlet or outlet side are not necessary.
The sensor can also prevent backflow.
5.2 Interference
uThe following minimum distances must be adhered to:
Distance between the sensor and ferromagnetic materials ≥30mm*
Distance between the sensor and constant / alternating fields ≥500mm
Distance between the sensor axes for side-by-side installation ≥50mm
* The pipe may consist of ferromagnetic material.
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5.3 Mounting accessories
uIf necessary, fasten the unit on the mounting plate (not supplied) from underneath.
1
27
Fig.3: Installation with mounting plate
1: Threaded hole M8 (depth 6 mm) on the bottom side of the unit
Information about available accessories at www.ifm.com
5.4 Installation in case of water containing dirt
uUse a 200-micron filter in front of the inlet (IN).
uInstall sensor horizontally.
uAdhere to the inclination angle to the horizontal axis:
± 90°
± 5°
Fig.4: Alignment in case of water containing dirt
In clean medium, installation in vertical pipes is also possible.
Information about available filters at www.ifm.com.

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6 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:
43
2 1
L+
L
1 BN
2 WH
3 BU
Fig.5: Wiring diagram (colours in accordance with DIN EN60947-5-2)
BN: Brown WH: White
BU: Blue
Information about available sockets / plugs at www.ifm.com.
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7 Troubleshooting
If there are dirt particles between the float and the housing the display value of the sensor does not
return to zero in case of flow standstill. In case of contamination the display value can be up to 30 % of
the final value of the measuring range.
uClean the device.

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8 Maintenance, repair and disposal
The operation of the unit is maintenance-free.
Only the manufacturer is allowed to repair the unit.
uAfter use dispose of the device in an environmentally friendly way in accordance with the
applicable national regulations.
8.1 Clean the device
If measurement errors occur because of an insufficient filtration cleaning may be required:
uLoosen socket head screw in the protective cover and unscrew.
uUnscrew sensor head.
uRemove float and spring.
uClean the inside of the float, spring and housing, e.g. by means of compressed air.
uBefore re-assembly check O-ring for damage. If necessary, replace and grease.
uAfter cleaning install components again.
uTighten sensor head with a tightening torque of 10 Nm.
uTo restore the measurement accuracy, press the float until you feel a mechanical stop using
something non-magnetic, e.g. a finger and hold for at least 2 seconds.
uScrew and align protective cover and tighten socket head screw with a tightening torque of 0.7 Nm.
1
2
3
4
6
7
5
Fig.6: Cleaning the sensor
1: Socket head screw 2: Protective cover
3: Float 4: Spring
5: O-ring: 6: Non-magnetic tool
7: Mechanical stop
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