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Precont ML

Precont ML

Pressure transmitter for measurement of absolute or relative pressure in gases, vapors, liquids and dust

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  • Integrated evaluation electronic 2-wire with current signal 4…20 mA

  • metallic flush-mounted EHEDG conformal membrane for hygienic applications

  • Wide range of applications
  • Finely graded measuring ranges from 100 mbar up to 25 bar
  • Wide process temperature range –20°C to +150°C
  • Various hygienic and aseptic process connections
  • High protection class IP69K/IP67
  • Wide environmental temperature range –20°C to +85°C
  • Metallic front-flush EHEDG conformal diaphragm
  • High accuracy – characteristic deviation to ≤ 0,5% of measuring range
  • Integrated evaluation electronic: current output 4…20mA / Voltage output 0…10V / connector plug M12 / connector plug EN 175-301-803-C / -A / connection cable with integrated reference air capillary
Application description

The device Precont® ML is an electronic pressure transmitter for continuous measuring of relative or gauge pressures in gases, vapors, liquids and dusts within closed container or pipes.

The use of a piezoresistive measuring sensor with EHEDG conformal metallic membrane and the corresponding excellent characteristics, allows the use especially in hygienic applications.

Function description

The device is mounted in the wall of the pressure container or of the pipe.

The system pressure is applied to the metallic membrane and causes there a variation of the resistance of the strain gage at the back side of the membrane.

The metallic membrane offers excellent characteristics like high pressure and pressure blow strength, vacuum resistance, high accuracy and reproducibility, good long term stability and a low temperature influence.

A FDA-listed pressure transmitting liquid is used for the transmission of the pressure from the membrane to the strain gage.

The pressure signal, that is transmitted by the membrane to the sensor is converted into an electrical signal and converted by the integrated evaluation electronic into a current signal 4...20 mA resp. voltage signal 0...10 V.

Technichal data

Power supply: Type A – 2-wire, current 4…20mA: 10…30VDC, reverse polarity protected; Type B – 3-wire, voltage 0…10V: 14…30VDC, reverse polarity protected
Supply current: Type A – 2-wire, current 4…20mA: ≤ 30mA; Type B – 3-wire, voltage 0…10V: ≤ 6mA Measurement accuracy
Characteristics deviation: ≤ ±0,5% FS
Long term drift: ≤ ±0,2% FS / year not cumulative
Temperature deviation: Measuring range ≤ 250 mbar: ≤ ±0,04% FS / K (0…+80°C) / ≤ ±0,06% FS / K (-20…0°C / +80…+150°C); Measuring range ≥ 400 mbar: ≤ ±0,02% FS / K (0…+80°C) / ≤ ±0,03% FS / K (-20…0°C / +80…+150°C) Material
Membrane (medium contact): Steel 1.4435/316L
Process connection (medium contact): Steel 1.4435/316L
Terminal enclosure: CrNi-steel
Gaskets (medium contact): FPM – fluorelastomere (e.g. Viton®), FDA-listed; EPDM – ethylene-propylene-dienmonomere, FDA-listed
Electrical connection part: Electrical connection type V – Plug M12: Device plug PUR; Electrical connection type S/T – Plug EN 175-301-803: Device plug PA / Gasket NBR; Electrical connection type K – Cable: Cable gland PA / Gasket CR / NBR / Cable sheath PE

Environmental conditions
Ambient temperature:  – 40°C...+85°C
Process temperatures: – 40°C...+150°C
Process pressure ranges: – 1 bar ...25 bar (depending on type)
Protection: Electrical connection type V – Plug M12: IP69K/IP67 (EN/IEC 60529); Electrical connection type S/T – Plug EN 175-301-803: IP65 (EN/IEC 60529); Electrical connection type K – Cable: IP69K (EN/IEC 60529) / IP68 [≤ 10 mwc] (EN/IEC 60529)