VAF Instruments 771 Electronic Fuel Viscosity Controller

VAF Instruments 771 Electronic Fuel Viscosity Controller

Introducing the VAF Instruments 771 Electronic Fuel Viscosity Controller, an essential component of the ViscoSense®, ViscoSense® 2, and Viscotherm® systems. This advanced electronic controller is designed for precise measurement and regulation of fuel oil viscosity, particularly within fuel oil treatment systems. The VAF viscosity control system consists of several crucial components, including the Viscosity Measuring Sensor, Temperature Measuring Sensor (standard for ViscoSense® and ViscoSense® 2), Electronic Viscosity Signal Converter (standard interface box for ViscoSense® and ViscoSense® 2), Electronic Viscosity Controller, and an optional Control Valve for Steam or Thermal Liquid. Operated by a microprocessor, the Electronic Viscosity Controller utilizes proportional and integrating control mechanisms. Available in both 1-channel and 2-channel configurations, it offers output options tailored to various viscosity control system requirements. These options encompass retransmission of viscosity and temperature data, along with relay outputs for control valve operation.

The controller features a color 1/4 VGA TFT liquid crystal display with an operator keypad containing six tactile membrane keys. Its sturdy construction, crafted from glass-filled polycarbonate, ensures durability in demanding environments. Technical specifications include an operating temperature range of 0 to 55 °C, operating humidity range of 5 to 95%RH (non-condensing), and an input voltage of 100 to 240 V AC ±10%. Input types comprise current 3-wire and optional PT100. Output options include analog (4-20 mA) and relay outputs (Controller and Alarm), with the provision for a 2-Wire Transmitter Power Supply (optional). Designed to meet stringent EMC, safety, and certification standards, the VAF 771 Electronic Fuel Viscosity Controller provides accurate viscosity and temperature measurements, delivering precise control outputs.

More About VAF Instruments 771 Electronic Fuel Viscosity Controller

Why choose VAF for viscosity control systems?

Today, VAF Instruments is a world-market leader in fuel viscosity control. In the 1960's VAF already introduced a viscosity sensor for fuel oil. From then on VAF's name for quality, reliability and accuracy has led to the current status of world-market leader. More than 30,000 systems have found their way to ships and industrial plants all over the world. You'll find VAF service facilities in more than 40 countries in principal harbours, industrial and shipbuilding areas of the world.


What makes ViscoSense® unique?

The VAF Instruments ViscoSense® is a viscosity sensor with a unique operating principle. The patented measuring principle is based on the rotational vibration of a pendulum in liquid. The damping of this electrically controlled vibration is directly related to the viscosity. Through this ViscoSense® achieves the most accurate viscosity measurement possible.


User benefits

1) Cost saving:

› optimises burning efficiency and fuel consumption

› reduces engine maintenance/overhaul costs

› no moving parts, therefore low operating costs are ensured

› the smooth-edged pendulum is practically insensitive to

› adherence to preventing local servicing costs


2) User-friendliness:

› no preventive maintenance is required because ViscoSense® has no moving parts

› the compact light-weight construction is easy to install in a new and retrofit application


3) Product quality:

› calibrated for life which makes re-calibration in the field unnecessary

› all SS-316 pendulum does not corrode and is durable

› provides better emission control to minimize air pollution


4) Unique product features:

› ISO 9001 quality assurance certification

› continuous in-line viscosity control

› resistant against line pulsations

› long-term accuracy and reproducibility

› type approval certificates from all major classification authorities


5) Guaranteed reliability:


› viscosity control of intermediate and heavy fuel oils used for main and auxiliary diesel engines on board ships

› viscosity control in oil-fired power plants and other industrial applications using heavy or intermediate fuel oil

In-line viscosity measurement in industrial applications

The ViscoSense® sensor is also suitable for in-line measurement of viscosity of many liquids in industrial applications. Because individual applications need special attention please contact I&C Services BV for a tailor-made solution.


Changing to ViscoSense® now!

VAF Instruments can supply special adapters to fit ViscoSense® directly into your existing system of any make. Name us the make and type of your existing system and we will send you dimensional drawings of the ViscoSense® solution.


In combination with ViscoSense®, VAF Instruments offers a range of viscosity control systems.

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VAF Instruments 771 Electronic Fuel Viscosity Controller

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VAF Instruments 771 Electronic Fuel Viscosity Controller