Product Vapor Pressure Process Analyzer

Vapor Pressure Process Analyzer



  • ASTM compliant cylinder piston design with 4:1 expansion
  • Suitable for high pressure applications (LPG)
  • Suitable for high viscous samples (Crude Oil) without flushing cycles
  • No maintenance approach
  • Integral temperature control unit
  • Network and fieldbus communication
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ATEX: II 2G Ex h IIC T4 Gb X
NEC 500: Class I, Division 2, Group B,C and D
NEC 505: Class I, Zone 1, AEx db eb ib pxb IIC T3
CEC Sec. 18: Ex db eb ib pxb IIC T3 resp.T4

Ambient Temperature



To remain competitive, today’s refiners must employ all optimization and product control techniques available. The use of online physical property analyzers is one of the key features to reach those objectives because they measure important quality properties in the process directly. The vapor pressure is an indication of a liquid evaporation rate and relates to the tendency of volatile components to escape from the liquid. To assure safe storage and transportation of petroleum products, minimize environmental pollution and assure proper functioning of combustion engines it is important to measure the vapor pressure.

Technical Data

Technology expansion with piston
4:1 expansion
Method compliant: ASTM D5191, DIN EN 13016-1, ASTM D6377 (VPCR4)
fuel up to 1.6 bar (23 psi), LPG up to 16 bar (232 psi)
≤ DIN EN/ASTM, fuel typ. 1.5 mbar (0.02 psi), LPG typ. 50 mbar (0.73 psi)
discontinuous, cycle time 7 min typically, depends on sample composition
Sample at inlet filtered 10 μm, moisture content max. 500 ppm, ≤ 200 cSt at inlet temperature
pour point 15 K below measuring temperature or cloud point temperature; for crude oil applications WAT needed
approx. 2 to 10 l/h (depends on product); approx. 30 l/h for re-cooling of peltier device; (not required if suitable coolant is available)
min. 2 bar (29 psi) above measuring range; standard: up to 8 bar (116 psi); optional: up to 18 bar (261 psi)
Standard: TM** 45 °C: TM**-40 K TINLET *** max. 45 °C(113 °F) Optional: TM**> 45 °C: TM**-30 K TINLET *** TM**+5K variation of temperature should not exceed 0.2 K/min
Sample at outlet can handle back pressure (on request)
Electrical data max. 8 (4 to 20 mA; 1000 Ω); active isolated on request
4 to 20 mA; 160 Ω
24 V DC; max. 0.5 A
high: 15 to 28 V DC/low: 0 to 4 V DC
24 V DC; max. 0.8 A
Communication MODBUS/RTU via RS485 or RS422 or FOC is
ethernet available
vapor pressure (others on request)
Alarm, Ready/Valid; Stream Selection, Validation Request, Reset
Ambient conditions operation 5 to 40 °C (41 to 104 °F); storage -20 to 60 °C (-4 to 140 °F)
operation 5 to 80 % relative humidity,storage 5 to 80 % relative humidity, – both are non-corrosive
IP 54 (comparable with NEMA 13)
HMI touch display 19"
remote access on request
cyber security
operating system Windows10 enterprise LTSB
Bartec Benke control software PACS
Process connections tube fittings: typically Swagelok 6mm/12mm/18mm; others on request
sample inlet up to 2 sample streams and 1 validation stream
sample outlet
vent line (if required)
coolant (if required)
Weight and dimensions approx. 250 kg
(W x H x D) approx. 1190 x 1930 x 710 mm
free space right: 150 mm/left: 100 mm

Application Notes

  • HYGROPHIL F 5673 & RVP-4 Process Trace Moisture Analyzer and Reid Vapour Pressure Analyzer for LNG

      Application Note AN016

    • EN

Questionnaires/Requirement Sheets

  • Questionnaire_PL AMS_PAT

Data Sheets

  • BENKE Vapor Pressure Process Analyzer RVP-4


  • BENKE Vapor Pressure Process Analyzer RVP-4