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Precont PU4LM

Precont PU4LM

Pressure transmitter for hygienic applications and monitoring of absolute or relative pressure in gases, vapors, liquids and dust - even from harzadous areas

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  • Measuring ranges from 100 mbar up to 25 bar
  • Various hygienic and aseptic process connections 
  • Metallic front-flush EHEDG compliant diaphragm
  • Process temperature range –20°C to +150°C
  • Fully welded robust steel enclosure
  • High protection class IP69K/IP67
  • Highest accuracy to ≤ 0,15%
  • Electronic 4…20mA HART® / RS485 Modbus®-RTU / IO-Link®
  • Certification ATEX / IECEx: Ex ia IIC Ga / Ex ia IIIC Da


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 25 bar (gauge), measuring ranges from 0 bar to 25 bar (absolute), measuring spans from 100 mbar to 25 bar, process temperatures from –20°C to +150°C, environmental temperatures from –40°C to +100°C, process material CrNi-steel as well as the availability of a variety of hygienic EHEDG-conformal process connections like thread ISO 228-1 with front-flush O-ring gasket, dairy coupling DIN 11851, Varivent®, DRD the device is especially suitable for the use for food and beverage industry, pharmaceutical industry, biotechnology and sterile process engineering.

The device is suitable for demanding measuring requirements. 

Due to its high accuracy and the digital adjustability by HART® (7.0) or RS485 Modbus RTU, the device can be suited a wide variety of applications.

The device 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 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.

Technichal data

Measuring range
Nominal pressure PN: -1…0bar / -1…1bar / 0…0,1bar to 0…25bar

Output type A – Current 4…20mA HART®
Analogue output: 4…20mA 3,9…20,5mA / ≥ 3,8mA / ≤ 22mA / dI ≤ 1µA
Time behavior: T90 ≤ 8ms / ton ≤ 0,2s
Interface: HART®-compliant (7.0) / 1200 Bit/s

Output type V – RS485 Modbus®-RTU
Interface: RS485, bidirectional / Modbus®-RTU / 9600 Baud (4800…38400 Baud)
Time behavior: T90 ≤ 2ms (td = 0s) / ton ≤ 0,1s (td = 0s)

Output type L – IO-Link®
Interface: IO-Link® V1.1 / Com2 (38400 Baud)
Analogue output: 0…20mA: 0…20,5mA / ≤ 0,05mA / ≤ 22mA / dI ≤ 1µA; 4…20mA: 3,8…20,5mA / ≥ 3,6mA / ≤ 22mA / dI ≤ 1µA
Switch output: 2x PP (Push-Pull), switch to +L/-L
Output: Uout ≤ 0,2V, ≥ Us – 2V / Iout 0…200mA (current limited ≤ 450mA, short circuit protected)
Time behavior: T90 ≤ 2ms / ton ≤ 0,1s

Auxiliary power
Supply voltage Us polarity protected: Type A – 4…20mA HART®: 9…35VDC / Ex: 9…30VDC; Type V – RS485 Modbus®-RTU: 6…35VDC; Type L – IO-Link®: 9…35VDC, without IO-Link® / 18…30VDC, with IO-Link®

Measuring accuracy
Characteristic deviation: ≤ ±0,15%/±0,5%FSO
Long term drift: ≤ ±0,2%FSO/year
Temperature deviation: Tk Zero ≤ 250mbar: ≤ ±0,04%FSO/K (0°C…+80°C)/≤ ±0,06%FSO/K (-20…0°C / +80…+150°C) / ≥ 400mbar: ≤ ±0,02%FSO/K (0°C…+80°C)/≤ ±0,03%FSO/K (-20…0°C / +80…+150°C); Tk Span: ≤ ±0,02%FSO/K (0°C…+80°C)/≤ ±0,03%FSO/K (-20…0°C / +80…+150°C)

Process conditions
Process temperature: -20°C...+150°C
Pressure cycles: ≥ 100 Mio. (1,2xPN)

Environmental conditions
Environmental temperature: -40°C...+100°C
Protection level: IP69K/IP67 (EN/IEC 60529)
MTTF: 463 years