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Precont PS4LM

Precont PS4LM

Pressure Switch for hygienic applications

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  • Hygienic and aseptic applications in: Food and beverage industry, Pharmaceutical industry, Biotechnology, Sterile process engineering
  • 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 IP65 / IP67
  • Wide environmental temperature range –40°C to +85°C
  • Metallic front-flush EHEDG conformal diaphragm 
  • High accuracy – characteristic deviation ≤ 0,5% of measuring range
  • Integrated evaluation electronic: Digital display, function LED’s, keyboard / 2x PNP switch output / 1x current output 4…20mA / Connector plug M12
  • 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

Due to the device construction with


the device is especially suitable for the use for food and beverage industry


pharmaceutical industry, biotechnology, sterile process engineering.


The pressure switch 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 pressure switch with 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.


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 particularly suitable for the special conditions of CIP/SIP cleaning processes, such as chemical stability towards cleaning liquids and high temperatures.


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


The front-flush diaphragm is completely welded with the process connection and supplied with a positive seal. A reliable, dead-space free sealing between the process connection and the process adapter resp. measuring medium is thus assured.


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 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.

Technische Daten

Supply voltage: 10,5…35VDC, reverse polarity protected
Supply current: ≤ 60mA Analogue output max. 22,5mA, switch output with no load

2xPNP-switch output
: PNP switch to +L
Output current: 0… ≤ 200mA current limited, short circuit protected

Analogue output 4...20mA
Operating range:
3,9…21mA, min. 3,8mA, max. 22mA
Permitted load: ≤ (US - 10,5V) / 22mA
Start-up time: ≤ 1 ms Measuring accuracy
Characteristic deviation:
≤ ± 0,5% FS 
Long term drift: ≤ ± 0,2% FS / year not cumulative
Temperature deviation ≤ ±0,2% FS 2) / 10K (0…80°C)

Diaphragm: (process wetted)
Steel 1.4435/316L
Process connection: (process wetted) Steel 1.4435/316L
Terminal enclosure: CrNi-steel
Gaskets: (process wetted) FPM – fluorelastomere (Viton®), EPDM – ethylene-propylene-dienmonomere, FDA-listed

Environmental conditions
Environmental temperature:
– 40°C...+85°C 
Process temperature: -20°C...+150°C
Process pressure: – 1 bar ...25 bar
Protection: IP65/IP67 EN/IEC 60529