ST0544 - Detector IFM - Free user manual and instructions

Product type	Flow controller (fluid flow detector)
Brand	IFM
Model	ST0544
Dimensions (approximate)	Length 80 mm, diameter 20 mm
Weight (approximate)	100 g
Power supply	Up to 60 V DC (SELV, PELV according to EN50178)
Main functions	Fluid flow monitoring, flow detection, output switching (yellow LED), sensitivity adjustment via potentiometer
Output type	Switching signal (dry contact)
Indicator LEDs	Green (set), Yellow (output switched), Red (not set)
Electrical connection	IFM female connector, standard wire colors
Installation	Welding an adapter onto the tube, installation with lock nut, O-ring and pressure washer
Installation depth	Depending on tube wall thickness (mark flush)
Minimum distance	5 x pipe diameter upstream, 3 x downstream
Temperature range	Not specified, but suitable for standard fluids
Material	Not specified, probably stainless steel or brass
Maintenance and cleaning	Clean the probe tip periodically with a soft cloth; use an acetic cleaning product for stubborn deposits (limescale)
Safety	Installation by an electrician, compliance with national and international standards, de-energize before connection
Spare parts and repairability	Welding adapter, O-ring, pressure washer, lock nut, potentiometer protective label
General information	Manual available as free PDF on notice-facile.com; manufacturer: IFM

Frequently Asked Questions - ST0544 IFM

How to install the ST0544 flow detector?

Weld the adapter onto the tube respecting the installation depth (the wall thickness number must be flush). For horizontal tubes, weld at 45°. Insert the detector into the adapter with the O-ring, pressure washer and lock nut, then tighten. Respect minimum distances: 5 x diameter upstream, 3 x downstream.

How to set the flow threshold?

Power on the device and establish a constant flow corresponding to the desired value. Turn the potentiometer until a green LED lights up. The farther the green LED is from the yellow LED, the greater the safety margin. Then stick the provided label to protect the setting.

What do the LEDs on the device mean?

The red LED indicates that the device is not set. The yellow LED indicates that the output is switched (flow detected). The green LED indicates that the device is correctly set.

Why does the yellow LED stay on after power-up?

This is normal for about 20 seconds: it is the start-up delay (stabilization time). After this time, the yellow LED should turn off if the flow is below the threshold, or stay on if flow is present.

How to maintain the detector?

Periodically check for deposits on the probe tip. Clean with a soft cloth. For stubborn deposits (limescale), use a usual acetic cleaning product.

What safety precautions must be observed?

Installation must be carried out by a qualified electrician and in accordance with national and international regulations. Disconnect power before connection. The device is intended for SELV/PELV power supply up to 60 V according to EN50178.

Can this detector be used with aggressive liquids?

The manual does not specify materials, but it is designed for standard fluids. For aggressive liquids, check compatibility with the manufacturer.

How to electrically connect the ST0544?

Use the IFM female connector. Wire colors are indicated on the diagram in the manual (page 2 or label). Connect the power supply and output according to your application. De-energize the installation before any intervention.

What to do if the red LED stays on permanently?

This means the device is not set. Follow the adjustment procedure: establish a constant flow and turn the potentiometer until a green LED appears. If the problem persists, check the installation and wiring.

Where to find the complete manual and spare parts?

The complete manual is available free of charge as a PDF on notice-facile.com. Spare parts (adapters, seals, etc.) are available from your IFM dealer or on the manufacturer's website.

USER MANUAL ST0544 IFM

Technical line drawing of a mechanical component with threaded shaft and bolt (no text or symbols)

Maßzeichnung

Scale drawing

Dimensions

1 = M18 x 1,5
2 = O-Ring
3 = Druckscheibe

1 = M18 x 1.5
2 = O-ring seal
3 = compr. washer

1 = M18 × 1,5
2 = joint torique
3 = rond. de pression

Anschlußschema

Wiring

ST0544

1 = BN (braun), 2 = WH (weiß), 3 = BU (blau), 4 = BK (schwarz).

A = connector view (sensor)

n.c. = not connected

Core colours of ifm sockets:

1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black).

1 = BN (brun), 2 = WH (blanc), 3 = BU (bleu), 4 = BK (noir).

Mechanical assembly diagram showing a bolt and shaft with rotational motion arrows (no text or symbols)

Pure diagram of a battery with internal circuit lines and no text or symbols

Function and features

The flow monitor monitors liquid media. It senses whether there is a preset flow (= medium flows) or not (= medium does not flow) and provides a switching signal.

Installation

1. Weld the adapter into the pipe. The installation depth depends on the pipe wall thickness. The bush should be inserted so that the figure corresponding to the wall thickness is flush with the outside pipe wall and can be seen from all sides (fig. 1a).

In the case of horizontal pipes the bush should be welded at an angle of 45^ (fig. 1b).

To avoid malfunction a minimum distance between the flow monitor and bends, valves or such like must be observed (fig. 3).

• Min. 5 x pipe diameter upstream,
• Min. 3 x pipe diameter downstream.

1. Insert the flow monitor into the bush by means of lock nut, O-ring seal and compression washer and screw it in completely using the full thread (fig. 2a, 2b).

1. Position the flow monitor (in the longitudinal pipe axis or transverse to it, fig. 3a) and fasten the lock nut (fig. 3b).

Electrical connection

The unit must only be mounted by an electrician.

The national and international regulations for the installation of electrical equipment must be observed.

Voltage supply for units up to 60 V to EN50178, SELV, PELV.

Isolate power, then connect the unit (see page 3 or type label).

Adjustment

Diagram of a battery with internal circuit lines and terminal blocks (no text or symbols)

setting potentiometer sensitivity

chain of LED's

• red LED lights: the unit is not adjusted
• yellow LED lights: the output is switched

• green LED lights: the unit is adjusted

• Apply the operating voltage. Switch on the flow (preset value) and keep it constant.

The yellow LED lights; the output is switched for about 20s (power-on delay time).

1. Turn the pot until one green LED comes on. The farther the green LED is away from the yellow LED, the safer is the adjustment (excess gain for flow or temperature fluctuations).
2. Conceal the pot after adjustment by the label provided to protect it against unauthorised tampering.

Operation

After mounting, wiring and setting check whether the unit operates correctly.

Recommended maintenance

Check the sensor tip for build-up from time to time. Clean it with a soft cloth. If necessary, build-up which adheres firmly (e.g. lime) can be removed with a common vinegar cleansing agent.

The units are suitable for use in moderate electromagnetic fields (see table). When operating ISM equipment or powerful walkie-talkies in the vicinity of the units additional measures to avoid malfunction can be required.

Noise immunity Standard Severity level
ESD	IEC 1000-4-2 / EN 61000-4-2	4 kV CD / 8 kV AD
HF radiated	IEC 1000-4-3 / EN 61000-4-3	3 V/m; 80 ... 1000 MHz
Burst	IEC 1000-4-4 / EN 61000-4-4	2 kV coupling pliers
HF conducted	IEC 1000-4-6 / EN 61000-4-6	3 V; 0.15 ... 80 MHz

Technical diagram of a mechanical assembly with rotating components (no text or symbols)

Diagram of a battery with internal circuit lines and terminal blocks (no text or symbols)