HFK35-FIN Flow Switch

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Repeatability±1 % MW (H2O dist.)
Electrical connectionFor round plug connector M12x1, 5-pole
CIP- / SIP temperatureWith spacer 140°C, 30 minutes max.
Power consumptionMax. 2.5 W
SensorCalorimetric measurement principle
Temperature gradient4 K/s
Storage temperature-20..+80°C
Process pressurePN 10
Analog output0/4..20 mA or 0/2..10 V
MakeHonsberg
Start-up time10 sec. after application of operating volt.
HysteresisAdjustable, position of the hysteresis depends on minimum or maximum switching value
WeightApprox. 0.25 kg
Supply voltage24 V DC±10 %
ConformityCE
Ambient temperature-20..+70°C
Measurement accuracy±3 % F.S. (H2O dist.)
Medium temperature0..+100°C
Materials medium-contactStainless steel 1.4404 (others available on request)
Process connectionSmooth tube for crimp connector or hose connection
Response timeIn water (25°C) at average Flow speed of approx. 1-2 sec.
Ingress protectionIP 67

Details :

For foodstuffs use
Analog output 0/4..20 mA or 0/2..10 V
Two programmable switches (push-pull)
Graphical LCD display, backlit (transreflective), can be read in sunlight and in the dark
Programmable parameters via rotatable, removable ring (programming protection)
Full metal housing with non-scratch, chemically resistant glass
Physical unit in the display (selectable)
Rotatable electronic head for best reading position
Optionally CIP/SIP-capable (130 °C)
Connection to USB interface for setting parameters

Characteristics :

The HFK35-FIN calorimetric sensor measures small fluid flows, and has been designed specially for use in the foodstuffs industry (for the measurement principle, see also "General description: calorimetric sensors").
The integrated transformer has a backlit graphics LCD display which is very easy to read both in the dark and in bright sunlight. The graphics display allows the presentation of measured values and parameters in a clearly understandable form. The measured values are displayed to 4 places, together with their physical unit, which may also be modified by the user. The electronics have an analog output (4..20 mA or 0..10 V) and two switching outputs, which can be used as limit switches for monitoring minimal or maximal, or as two-point controllers. The switching outputs are designed as push-pull drivers, and can therefore be used both as PNP and NPN outputs. Exceeding limit values is signalled by a red LED which is visible over a long distance, and by a cleartext in the display. The stainless steel case has a hardened non-scratch mineral glass pane. It is operated by a programming ring fitted with a magnet, so there is no need to open the operating controls housing, and its leakproofness is permanently ensured. By turning the ring to right or left, it is simple to modify the parameters (e.g. switching point, hysteresis...). To protect from unintended programming, it can be removed, turned through 180^o and replaced, or completely removed, thus acting as a key.

Wiring :

Before the electrical installation, it must be ensured that the auxiliary voltage corresponds to the data sheet.
The switching outputs are self-configuring, depending on whether they are connected as PNP or NPN switches (push-pull).
It is recommended to use shielded wiring.

Handling and operation :

In order to ensure the sensor's maximum insensitivity to interference, the flow should run from bottom to top (best degassing even at the slowest flow speed). Standard crimp connectors, hoses with crush protection, or the crimp connectors provided by HONSBERG can be used for the connection.
The insulation hoses provide the best possible insulation from the environment, and should therefore not be removed.
It must be ensured that the calming section with the static mixer is not kinked.

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