ST0526 - Flow controller IFM - Free user manual and instructions

Product Type	Flow Controller
Brand	IFM
Model	ST0526
Dimensions	D = 15 mm for M12x1 and G1/4" thread; D = 23 mm for G1/2" thread
Power Supply	Up to 60 V (EN50178, SELV, PELV)
Main Functions	Fluid flow monitoring, rapid detection of stop or circulation (> 100 cm/s), circulation signal near switching point
Mounting	Probe completely immersed; horizontal pipes: lateral mounting; vertical pipes: ascending flow mounting; minimum upstream distance 5 x pipe diameter, downstream 3 x diameter
Electrical Connection	By electrician; disconnect power; wiring diagram with color codes (BN, WH, BU, BK)
Adjustment	Potentiometer; set constant flow, turn right until 6th green LED, then left until 1st/2nd green LED; 20 s delay
Operation	Check after configuration; faults indicated by intermittent outputs and LED oscillating between green and red
Maintenance and Cleaning	Check deposits on probe; clean with soft cloth; for limescale deposits, use common acetic acid product
Safety	Comply with national/international regulations; device for moderate electromagnetic fields; additional measures if near ISM or walkie-talkies
Immunity to Interference	Electrostatic discharge 4 kV CD / 8 kV AD; RF radiation 3 V/m, 80-1000 MHz; transients 2 kV; conducted RF 3 V, 0.15-80 MHz

Frequently Asked Questions - ST0526 IFM

How to install the ST0526 flow controller?

Install the probe completely in the fluid. For horizontal pipes, side mounting; for vertical pipes, ascending flow. Respect minimum distances: 5 x diameter upstream, 3 x diameter downstream.

What is the electrical connection?

The device must be installed by an electrician. Disconnect power. Colors: 1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black). Power supply up to 60V according to EN50178.

How to adjust the flow controller?

Set constant flow, turn potentiometer right until 6th green LED. After 20s, turn left until 1st/2nd green LED. Stop flow: after 1-2s, yellow LED changes. Resume flow: after 1-2s, yellow LED returns.

What to do in case of a fault?

Faults are indicated by intermittent outputs and LED oscillating between green and red. Causes: max speed not reached after activation, flow not fully stopped after deactivation, incorrect adjustment.

How to clean the probe?

Periodically check deposits. Clean with a soft cloth. For stubborn deposits (limescale), use a common acetic acid product.

What are the dimensions of the controller?

D = 15 mm for M12x1 and G1/4" thread; D = 23 mm for G1/2" thread.

What is the required power supply?

Power supply up to 60V, according to EN50178, SELV, PELV.

Can it be used with all fluids?

The controller monitors fluids. The probe must be completely in the fluid. To avoid malfunction, respect minimum distances from bends and valves.

How to check proper operation?

After mounting, wiring and adjustment, check by activating/deactivating the flow. The signal should switch within 1-2s.

What to do in case of electromagnetic interference?

The device is designed for moderate fields. If powerful ISM systems or walkie-talkies are nearby, additional measures may be necessary.

USER MANUAL ST0526 IFM

Flow monitor ST (short response time)

Technical line drawing of a mechanical component with no visible text or symbols

Function and features

The flow monitor monitors liquid media. It makes quick detection of flow or no flow at high flow rates possible (> 100 cm/s).

The flow signal is always near the switch point (2nd red to 2nd green LED). As a consequence the unit cannot be set with a higher excess gain in order to compensate for flow or temperature fluctuations.

The flow is to be switched on and off as quickly as possible, i.e. when the flow is switched on the maximum flow rate, when the flow is switched off the state “no flow” is to be reached as quickly as possible.

Installation

The sensor tip must be completely immersed in the medium.

In the case of horizontal pipes mount the unit from the side, if possible (fig. 1). Do not mount it directly from the top or bottom.

In the case of vertical pipes mount in a place where the medium flows upwards (fig. 2).

D = 15mm for units with M12 x 1 and 1/4" thread

D = 23mm for units with 1/2" thread.

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.

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. Disconnect power before connecting the unit.

Wiring diagramm:

Core colours of ifm sockets:

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

Adjustment

1. Insert the unit into the flow and apply operating voltage.
2. Set requested flow (valve "OPEN") and keep it constant.
3. Set unit to 6th green LED by turning the potentiometer clockwise.

1. When power-on delay time has elapsed (ca. 20s), set display to 1st/2nd green LED by turning the potentiometer anticlockwise.

1. Switch off flow (valve “CLOSED”). The flow monitor indicates “no flow” after approx. 1 to 2s: the yellow LED goes off (if unit is normally open) or comes on (if unit is normally closed).
2. Switch on flow again. The flow monitor indicates “flow o.k.” after 1 - 2 seconds (yellow LED comes on/goes off again).

Now the flow monitor is ready for use.

Operation

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

The flow monitor indicates errors by 2 signals:

a) outputs alternative: on, off, on, off,
b) the LED fluctuate from red to green and back.

The following errors are indicated in this way:

• When flow is switched on, the maximum flow rate is not reached.
• When flow is switched off, flow is not completely stopped (low flow rate remains).
• Faulty setting of the unit.

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