IFM SBU3 Series User manual

Operating instructions
Mechatronic flow sensor
SBU3xx
11374543 / 0008 / 2021
GB

SBU3xx Mechatronic flow sensor
2
Contents
1 Preliminary note ............................................................. 3
1.1 Symbols used.......................................................... 3
1.2 Warnings used ......................................................... 3
2 Safety instructions............................................................ 4
3 Intended use................................................................ 5
4 Mounting................................................................... 6
4.1 Process connection...................................................... 6
5 Electrical connection.......................................................... 7
6 Settings.................................................................... 8
6.1 Set the switch point on the unit............................................. 8
6.2 Carry out the flow adjustment.............................................. 8
7 Operation .................................................................. 9
8 Maintenance, repair and disposal................................................ 10

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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 detects liquid media (glycol solutions, industrial oils, coolants).
It detects the volume flow (flow rate/time) according to the principle of differential pressure and
switches the output.
The switch point is adjustable.
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 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.
4.1 Process connection
The unit provides 5 connections for pipe thread G½.
1
IN OUT1
G2
1
OUT2
G2
1
G2
1
G2
1
OUT3
G2
1
Fig.1: Process connection
1: Connection for additional sensor
2: Inlet
OUT1…OUT3: 3 x outlet for different connection types
The connections 1, OUT2 and OUT3 are equipped with sealing plugs on delivery.
uRemove the sealing plugs if required.
Calming sections on the sensor's inlet or outlet side are not necessary.

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5 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
BN1
4 BK
3 BU
Fig.2: Wiring diagram (colours in accordance with DIN EN60947-5-2)
BN: Brown BK: Black
BU: Blue
Information about available sockets / plugs at www.ifm.com.

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6 Settings
There are 2 options to set the switch point:
• Set the switch point on the unit.
• Carry out the flow adjustment.
1
5
L/min
1
5
L/min 2
3
4
1
Fig.3: Switch point setting
1: Yellow LED (switching status) 2: Setting scale
3: Lock nut 4: Knurl
Do not turn the knurl beyond the maximum value of the setting range (Ò Technical data) to
avoid faulty switching.
6.1 Set the switch point on the unit
uLoosen the lock nut.
uTurn the knurl until the target value just becomes visible on the setting scale.
uTighten the lock nut.
6.2 Carry out the flow adjustment
uLet the normal flow circulate in the installation.
uLoosen the lock nut.
uSet the switch point by slowly turning the knurl:
wThe switch point has been reached as soon as the LED is on.
uTighten the lock nut.

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7 Operation
After power on, the unit is ready for operation.
The unit detects the volumetric flow quantity and switches the output according to the setting.
• Output closed (LED = ON), if volumetric flow quantity ≥ switch point.
• Output open (LED = OFF), if volumetric flow quantity < switch point.

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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.
In case of heavily polluted media:
uMount a filter in front of the inlet (IN). Recommendation: use a 200-micron filter.