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Precont MT

Precont MT

Analog pressure transmitter with metal strain gauge diaphragm

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Application description

The device is an electronic pressure transmitter for monitoring, control as well as continuous measurement of pressures in gases, vapors, liquids and dusts.

Due to the device construction with measuring ranges from -1 bar to 1000 bar, gauge, measuring ranges from 0 bar to 1000 bar, absolute, measuring spans from 400 mbar to 1000 bar, process temperatures from –40°C to +125°C, environmental temperatures from –40°C to +100°C, process material CrNi-steel as well as the availability of industrial standard process connections like thread ISO 228-1 (EN 837 manometer) and thread ISO 228-1 (front-flush) the device is especially suitable for the use for machinery and plant engineering, air-conditioning and refrigeration plant engineering, hydraulic and pneumatic systems, process industrye, nvironmental technology and facility and building automation.

The device is suitable for demanding measuring requirements. 

The front-flush diaphragm has been specifically designed for the measurement of viscous, paste-like, adhesive, crystallizing, particle-laden and contaminated media, which would clog the pressure channel of conventional process connections.

The certification acc. to ATEX II 1 G Ex ia IIB/IIC Tx Ga allows the use in explosion hazardous areas.

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 the lowest temperatures when used outdoors, extreme shock and vibration stress 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 factory certifications for drink water resp. food suitability.

  • Wide range of applications
  • Finely graded measuring ranges from –1 bar up to 1000 bar
  • Wide process temperature range –40°C to +125°C
  • Wide variety of process connections
  • High protection class IP69K/IP67
  • Wide environmental temperature range –40°C to +85°C
  • Certification ATEX II 1 G Ex ia IIB/IIC Tx Ga
  • Metallic front-flush or internal 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
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 deflection of the polysilicone resp. thin film strain gauge at the back side of the membrane. At measuring ranges of 0...25 bar and smaller, the pressure is transmitted by a pressure transmitting liquid to the polysilicone strain gauge.

The metallic membrane offers excellent characteristics like high pressure and pressure blow strength up to five times the nominal pressure, vacuum resistance, good reproducibility and hysteresis and also good long term stability and a low temperature influence.

The pressure dependent variation of the strain gauge output voltage is converted by the integrated evaluation electronic into a current signal 4...20 mA resp. voltage signal 0...10 V.

Technische Daten

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 ≤ 25 bar: ≤ ±0,02% FS / K (0…+80°C) / ≤ ±0,03% FS / K (-40…0°C / +80…+125°C); Measuring range ≥ 40 bar: ≤ ±0,02% FS / K (-40…+100°C) / ≤ ±0,03% FS / K (+100…+125°C)

Membrane (medium contact): Process connection type 0 – front-flush / Process connection type 1 / type 6 – EN 837 / ≤ 25 bar: Steel 1.4571/316Ti; Process connection type 1 / type 6 – EN 837 / ≥ 40 bar: Steel 1.4542/630 / Steel 1.4534/SI13800
Process connection (medium contact): Steel 1.4571/316Ti 
Terminal enclosure: CrNi-steel
Gaskets (medium contact): FPM – fluorelastomer (e.g. Viton®); EPDM – ethylene-propylene-diene monomer; NBR – nitrile-butadiene rubber
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...+100°C resp. 125°C
Process pressure ranges: – 1 bar ...1000 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)