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Hydrocont HN4

Hydrocont HN4

Hydrostatic fill level sensor Hydrocont® HN4 - successor of Hydrocont® SN50

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  • Hydrostatic level transmitter / level switch with data memory for general applications - monitoring of levels in liquids - also suitable for hygienic areas

  • with ceramic front-flush diaphragm

  • with TFT-display, 4-20mA or 0-10V output and up to 4 pnp switching outputs

  • Wide range of applications

  • Finely graded measuring ranges from 50 mbar up to 20 bar

  • Wide process temperature range –40°C to +125°C

  • Construction types extension cable and extension tube

  • Wide variety of process connections and high protection class IP65 / IP67

  • Wide environmental temperature range –20°C to +70°C

  • Ceramic front-flush diaphragm

  • Increased accuracy – characteristic deviation ≤ 0,05% of measuring range

  • Integrated evaluation electronic: 4x PNP switch output / 1x current output 0/4…20mA – voltage output 0…10V / Measure data memory for more than 500.000 measuring values / Battery powered data logger function / Bluetooth

  • High operating comfort: enclosure and display rotatable for optimal operability in each installation position

  • Robust high brightness LED display for best readability

  • 3-key operation without additional assistance with tactile feedback

Application description

The device is an electronic level transmitter / level switch for monitoring, control as well as continuous measurement of levels in liquids.

Due to the device construction with measuring ranges from -1 bar to 20 bar, measuring spans from 50 mbar to 20 bar, process temperatures from –40°C to +125°C and process materials Al2O3-ceramic / CrNi-steel as well as the availability of the two construction types extension cable (e.g. at limited installation situations, long sensor length) or extension tube (e.g. at strong turbulences, aggressive media, high temperatures) and the availability of industrial standard process connections like thread connection ISO 228-1 the device is especially suitable for the use for level and volume measurement, flow measurement at open channels and measuring weirs and for general applications in water and waste water sector machinery and plant engineering, air-conditioning and refrigeration plant engineering, hydraulic and pneumatic systems, process industry and environmental technology.

The device is suitable for demanding measuring requirements. 

Due to its high accuracy and the high flexibility of configuration, the device can be suited a wide variety of applications.

The robust design and the high-quality workmanship turns the device into a very high quality product, which even the most adverse environmental conditions cannot affect, whether low temperatures when used outdoors, high shock and vibration or aggressive media.

A captive laser marking of the type label ensures the identifiability throughout the entire lifetime of the device.

Obviously is the optional marking of a measurement point designation resp. TAG, a customer label or of a neutral type label, of course also per laser marking.

A LABS-free resp. silicone-free version, a factory calibration with calibration certificate and a customer specific configuration resp. preset is also optionally available like a material test certificate EN10204 3.1 or factory certifications for drink water resp. food suitability.

Function description

The level measurement system Hydrocont® HN4 is built in the wall of the medium container.

The medium contacts directly the ceramic membrane of the sensor without using a pressure mediator liquid and causes there a deflection of the membrane because of the hydrostatic pressure of the medium.

At the maximum deflection the membrane contacts a robust ceramic carrier and because of this, the membrane come through over pressure of e.g. 80-times of nominal load at a sensor with a pressure range of 0...50 mbar without damage.

The fill level proportional pressure signal of the ceramic membrane is recorded from a processor with high resolution, adjusted according to the settings and converted into a high resolution output signal of 4...20mA or 0...10V.

By using optical keys and an TFT-display the sensor measurement range, the display, the PNP-switching outputs and the damping can be adjusted or the behaviour in the case of failure and the release of the fast adjustment can be set.

The switching state of the up to 4 PNP-switching output is signalled by the TFT-display.

Technical data

Supply voltage: Setting output 0/4...20 mA: 9..30 VDC, reverse polarity protected; Setting output 0…10 V: 14..30 VDC, reverse polarity protected

Supply current: ≤ 50mA up to ≤ 100mA (depending on output, bluetooth ON/Off, US)

Start-up time:≤ 1s

Step response time:≤ 15 ms (td = 0s)

Operating range:Analogue output – current 0…20mA IOut: 0…20,5mA, max. 22mA; Analogue output – current 4…20mA IOut: 3,8…20,5mA, min. 3,6mA, max. 22mA; Analogue output – voltage 0…10V UOut: 0 ... 10,5 V, max. 11 V


Switch output PNP S1 / S2 / S3 / S4

Function: PNP switch to +L

Output current: 0… ≤ 200mA current limited, short circuit protected


Measuring accuracy

Characteristic deviation: ≤ ±0,05% / ±0,1% / ±0,2% FS Long term drift:≤ ± 0,1% FS / year not cumulative Temperature deviation Zero:Zero: ≤ ±0,015% FS 2) / K, max. ±0,75 % (-20°C…+80°C); Span: ≤ ±0,015% FS 2) / K, max. ±0,5 % (-20°C…+80°C / > 0,4 bar), max. ±0,8 % (-20°C…+80°C / ≤ 0,4 bar)



Diaphragm: (process wetted) Process connection Type 7 – G1½“ / Sensor Ø40mm: Ceramic Al2O3 – 99,9%; Process connection Type 8 – G¾“ / Sensor Ø22mm Measuring range ≤ 1bar: Ceramic Al2O3 – 99,9%; Process connection Type 8 – G¾“ / Sensor Ø22mm Measuring range ≥ 1,6bar: Ceramic Al2O3 – 96%

Process connection: (process wetted) Steel 1.4404/316L / Steel 1.4571/316Ti

Terminal enclosure: CrNi-steel

Gaskets (process wetted):FPM – fluorelastomere (e.g. Viton®); EPDM – ethylene-propylene-dienmonomere, FDA-listed; FFKM – perfluorelastomere (e.g. Kalrez®); FFKM hd – perfluorelastomere high density


Environmental conditions

Environmental temperature:– 20°C...+70°C

Process temperature:-40...+100°C (extended -40...+125°C)

Process pressure:– 1 bar ...20 bar (depending on process connection)

Protection:IP65/IP67 EN/IEC 60529