Product Viscosity Index Process Analyzer

Viscosity Index Process Analyzer



  • The only ASTM compliant viscosity index analyzer
  • Kinematic viscosities directly and continuously measured
  • Integral measurement of density
  • Integral calculation of viscosity index
  • Unparalleled temperature stability of ± 0.02 K
  • Hagenbach correction not necessary
  • No maintenance approach (no oil baths, no pumps)
  • Network and fieldbus communication
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ATEX: II 2G Ex h IIC T3 Gb X
IECEx: on request
NEC 500: on request
NEC 505: on request
CEC Sec. 18: on request
TR CU: on request

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. All fluids that fulfil the conditions of Newton’s friction law are referred to as Newtonian fluids. Their viscosity is a material constant, which is only dependent on pressure and temperature.
The viscosity index is a widely used and accepted measure of the variation in kinematic viscosity due to changes in the temperature of a petroleum product between 40 and 100°C. A higher viscosity index indicates a smaller decrease in kinematic viscosity with increasing temperature of the product.

Technical Data

Technology continuously analyzing kinematic viscosities at 40 °C and 100 °C, capillary-type
Method compliant with: ASTM D445, ASTM D2270, ASTM D341, DIN EN ISO 3104, IP 71
Sample at inlet filtered 10 μm or 50 μm (depending on the viscosity measuring range), bubble-free max. viscosity 800 cSt at the lowest temperature (technical clarification required) (sample as coolant ≤ 10 cSt)
3.8 to 10 l/h (depends on variant)
3 to 14 bar (43.5 to 203 psi)
50 to 60 °C; changes ≤ 0,1 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
viscosity index (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, non-corrosive; storage 5 to 80 % relative humidity, 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. 600 kg
(W x H x D) approx. 2540 x 1930 x 710 mm
free space right: 150 mm/left: 100 mm

Questionnaires/Requirement Sheets

  • Questionnaire_PL AMS_PAT

Data Sheets

  • BENKE Viscosity Index Process Analyzer VI-4


  • BENKE Viscosity Index Process Analyzer VI-4

  • Cyber Security Solutions for BARTEC BENKE analyzers