ST0531 - Flow detector IFM - Free user manual and instructions
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USER MANUAL ST0531 IFM
Flow monitor ST (short response time)
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Technical line drawing of a mechanical component with no visible text or symbolstext_image
Weather icon grid with blank circles for all days and a sun symbol in the centertext_image
Diagram showing a sequence of circles with a sun icon, likely representing a sequence or pattern in a diagram.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.
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1 D packing washer
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D packing washerTo 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.
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3 min. 3 x D min. 5 x D DElectrical 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:
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connector view (sensor) 1 BN L+ 2/4 BK 3 BU L- 3 BU L+ 2/4 BK 1 BN L- 1 2 4 3Core colours of ifm sockets:
1 = BN (brown), 2 = WH (white), 3 = BU (blue), 4 = BK (black).
Adjustment
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setting potentiometer sensitivity - Ⓞ + chain of LED's- Insert the unit into the flow and apply operating voltage.
- Set requested flow (valve "OPEN") and keep it constant.
- Set unit to 6th green LED by turning the potentiometer clockwise.
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Weather icon sequence showing sun and moon symbols with blank circles for days- When power-on delay time has elapsed (ca. 20s), set display to 1st/2nd green LED by turning the potentiometer anticlockwise.
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Simple diagram with circles and a sun symbol, likely representing a basic weather or weather pattern.- 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).
- 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 |
