IFM SL020 Series User manual

Operating instructions
Airflow monitor
SL020x
SL510x
11426376 / 0012 / 2021
GB

SL020x SL510x Airflow monitor
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Contents
1 Preliminary note ............................................................. 3
1.1 Symbols used.......................................................... 3
2 Safety instructions............................................................ 4
3 Intended use................................................................ 5
4 Function ................................................................... 6
5 Installation.................................................................. 7
6 Electrical connection.......................................................... 8
7 Settings.................................................................... 9
8 Operation .................................................................. 10

Airflow monitor SL020x SL510x
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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

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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.

Airflow monitor SL020x SL510x
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3 Intended use
The unit monitors airflows and switches a relay.

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4 Function
• The unit detects flow based on the calorimetric measuring principle.
• The unit signals when a set airflow is reached by switching a relay and providing an LED signal:
Flow... Output relay* LED
above the set value • Normally open: relay energises.
• Normally closed: relay de-energises.
green
below the set value • Normally open: relay de-energises.
• Normally closed: relay energises.
red
*Information on the unit type (NO or NC) Ò Technical data at http://documentation.ifm.com.

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5 Installation
uDrill a hole with a diameter of 24 mm in the pipe.
uMount the unit using the supplied mounting clamp:
• Use the supplied seal for a hermetically sealed installation.
• The sensor head must protrude completely into the airflow and should be in the area of the highest
flow velocity. Installation depth: min. 32 mm, max. 120 mm.
≥32 mm ≤120 mm
Fig.1: Process connection, installation depth
uAlign the unit in the airflow. The arrow on the cap must point in the direction of flow:
arrow
(must be on top)
arrow
potentiometer
potenti-
ometer
LEDs
LEDs
Fig.2: Orientation
≥5 x D ≥3 x D
D
Fig.3: 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.

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6 Electrical connection
The unit must be connected by a qualified electrician.
Observe the national and international regulations for the installation of electrical equipment.
Voltage supply according to SELV, PELV.
The design of the unit complies with protection class II.
uInsert a miniature fuse according to IEC 60127-2 sheet 1 (≤ 5 A fast acting), if specified in the data
sheet.
uCheck the safe functioning of the unit after a short circuit.
uObserve the applicable standards.
uDisconnect power.
uConnect the unit as follows:
BN
WH
BU
BK
L1
N
L+
L
Fig.4: Wiring diagram (colours to DINEN60947-5-2)
BK: black BN: brown
BU: blue WH: white

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7 Settings
setting potentiometer
sensitivity
LEDs
Fig.5: Operating and display elements
Flow adjustment for setting the switching point:
uSwitch on the power supply.
uLet the normal flow circulate in the installation and keep it constant.
wBoth LEDs (red and green) are on. After approx. 60 s one LED goes out.
uContinue with step 1 or 2.
1. If the red LED is on:
uTurn the potentiometer slowly clockwise until the red LED goes out and the green LED comes on.
2. If the green LED is on:
uTurn the potentiometer slowly anti-clockwise until the green LED goes out and the red LED comes
on.
uTurn the potentiometer slowly clockwise again until the red LED goes out and the green LED
comes on.
If fluctuations which may result during operation shall be compensated for:
uWhen the green LED has come on, continue to turn the potentiometer clockwise.

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8 Operation
After switching on the supply voltage, both LEDs come on for approx. 60 s, the output relay is
energised (power-on delay time).
Then the unit is ready for operation.