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Precont CT

Precont CT

Analog pressure transmitter with front-flush ceramic, capacitive 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 16 bar (gauge), measuring ranges from 0 bar to 16 bar (absolute), measuring spans from 100 mbar to 16 bar, process temperatures from –40°C to +125°C, environmental temperatures from –40°C to +85°C, process materials Al2O3-ceramic / CrNi-steel as well as the availability of industrial standard process connections like

thread ISO 228-1 the device is especially suitable for the use for machinery and plant engineering, air-conditioning and refrigeration plant engineering, hydraulic and pneumatic systems, process industry, environmental technology, facility and building automation.

The device is suitable for demanding measuring requirements. 

Through its optimized design, the front-flush process connection enables the cleanability of the wetted diaphragm to be integrated into the process.

The device is suitable for the use at SIP cleaning processes.

Low-maintenance and trouble-free pressure measurement is thus also guaranteed in critical applications with frequently changing media.

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.

  • Wide range of applications
  • Finely graded measuring ranges from 100 mbar up to 16 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
  • Ceramic front-flush diaphragm
  • High accuracy – characteristic deviation to ≤ 0,1% 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 ceramic membrane and causes there a variation of the capacity at the back side of the membrane.

The ceramic membrane offers excellent characteristics like highest pressure and pressure blow strength up to forty times the nominal pressure, vacuum resistance, very high resistance against chemicals, corrosion and abrasion as well as very good insensitiveness against temperature shocks, highest accuracy and reproducibility, good long term stability and a very low temperature influence.

The pressure dependent variation of capacity 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:
≤ ±0,1% / ±0,25% FS
Long term drift: ≤ ±0,15% FS / year not cumulative
Temperature deviation: Zero: ≤ ±0,015% FS / K / max. ±0,75 % (-20°C…+80°C); Span: ≤ ±0,015% FS / K / max. ±0,5 % (-20°C…+80°C / > 0,4 bar) /  max. ±0,8 % (-20°C…+80°C / ≤ 0,4 bar)

 (medium contact):  Measuring range ≤ 1bar: Ceramic Al2O3 – 99,7% (SIP suitable); Measuring range ≥ 1,6bar: Ceramic Al2O3 – 96% (SIP suitable)
Process connection (medium contact):  Steel 1.4404/316L / Steel 1.4571/316Ti
Terminal enclosure: CrNi-steel
Gaskets (medium contact): FPM – fluorelastomere (e.g. Viton®); EPDM – ethylene-propylene-dienmonomere, FDA-listed; FFKM – perfluorelastomere (e.g. Kalrez®); FFKM hd – perfluorelastomere high density
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 ...16 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)