ISTEC Corporation, your Flow Measurement and Control Specialist
 

ISTEC CORPORATION
Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
Tel 973-383-9888
Fax 973-383-9088
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 Contoil VZD/VZP and DFM Fuel MetersContoil VZD, VZP and DFM Fuel Meters

Fuel Consumption Measurement
For Trucks. Buses, Trains, Construction & Agricultural Machinery, Small Boats and Generators

The best choice to control you fuel consumption for trucks, buses, trains, construction and agricultural machinery, small boats, and generators.

Features & Benefits

  • Quick and Easy Installation in Vehicles of Every Type
  • Supports Most Used Models
  • Short Down-time (Off-operation) Period
  • Proved and Tested System
  • Easy and Accurate Reading of Engine Fuel Consumption
  • No Extra Maintenance Necessary
  • Tamper-proof Measurement
  • Low Installation Costs
  • Quick and Easy Installation
  • Quick Pay-back Period

How to Measure Fuel – Two Systems: Direct and Differential Consumption)

Measure Fuel by Direct Consumption

With this variant, the fuel is sucked out of the tank by the pump and through the preliminary filter, then fed through the fine filter to the mechanical injection pump. Depending on the engine conditions, the injection pump measures the fuel to be injected and forwards it to the individual cylinders. There, the fuel is injected into the combustion chamber by the injection nozzles. The unused fuel is not fed back to the tank through a separate line, but is fed back into the fuel line after the pump and before the fine filter in order to filter out any mechanical impurities. In this variant, the pump supplies the amount of fuel required by the engine, depending on its operating mode. The pump supply is controlled by the pressure after the pump.

Measure Fuel by Differential Consumption

With this variant, the fuel is sucked out of the tank by the pump and through the preliminary filter, then fed through the fine filter to the mechanical injection pump. Depending on the engine conditions, the injection pump measures the fuel to be injected and forwards it to the individual cylinders. There, the fuel is injected into the combustion chamber by the injection nozzles. The pump's job is to provide 4 to 10 times the amount of fuel that could possibly be used (e.g., for a maximum consumption of 50 l/h, the pump should be able to supply 200 l/h to 500 l/h). This quantity depends on the engine and the manufacturer; the above figures are just guidelines. The unused fuel is returned back to the tank through a separate line. This is the standard in modern engines (common rail, etc.).

Our fuel flow meters are manufactured to run according to the fuel oil specification in the norm ISO 8217-2010. This norm specifies the characteristics of the fuel. Fuel oil with low sulphur can be used if it follows the rules specified in the mentioned norm. A few parameters from this norm are listed in the table below...

Fuel Information

*) Diesel, diesel oil or AGO (Automotive GasOil) are the same
**) Also used for river boats
***)Max. value – normally, the value is much lower

Viscosity Information

Kinematic viscosity – Stokes, Centi-Stokes, mm2/s – St, cSt, mm2/s
Dynamic viscosity – Poise, Centipoise (outmoded) – P, cP

Conversion – cSt 3 density = mPa.s
Engler degrees °E to mPa.s: only use conversion table
Saybolt units to mPa.s: only use conversion table
Redwood units to mPa.s: only use conversion table

Rule of Thumb – 1 cSt ~ 1mm2/s ~ 1mPa.s

Contoil VZD 4, VZP 4

Contoil VZD 4, VZP 4

Contoil VZD 8, VZP 8, DFM 8D, DFM 8S, DFM 8EDM, DFM 8ECO, DFM 12ECO

Contoil VZD 8, VZP 8, DFM 8D, DFM 8S, DFM 8EDM, DFM 8ECO, DFM 12ECO

Contoil DFM 20S

Contoil DFM 20S

Contoil DFM 25S

Contoil DFM 25S

Viscosity Diagrams

A = 5 mPa.s
B = 50 mPa.s
C = 100 mPa.s
D= 200 mPa.s
E = 500 mPa.s

For a pressure drop of more than 1 bar, it is recommended to use the next larger meter size. Maximum permissible pressure drop = 3 bar

Example for Trucks

Below are examples on how easy it is to calculate what this system is worth to you...

Examples of Operating Data of Vehicle

  1. Average price of diesel fuel in Europe
  2. DFM 8D used for this example. Complete investment cost may vary from country to country due to local situations.
    Includes flow sensors, board computer, all transport and import costs, installation and start-up of system.

Take the example from the third column: with the above vehicle operating data and 10% estimated reduction of fuel cost, the investment will pay back its costs after only three months. Since the figures are different in each area, they have to be adapted to individual values. Ask your authorised dealer for a personal assessment. He will calculate your possible cost savings based on your vehicle data, operating conditions and the local cost situation.


… and We Offer and Support BOTH of Them!

VZD / VZP System – Suitable for Small Engines

Contoil VZD 4 

Contoil VZD 4 – Tech Data & Specs Here

The easy way to find your fuel consumption. Just install it and read the values on the display (total, trip, current consumption and more).

 

 

 

Contoil VZP 4 Contoil VZP 4 – Tech Data & Specs Here

If the installation place is hidden and a read-out on the flow meter not possible, than this flow meter is the right one. Connect it to the Contoil VZD CU and you will have all the necessary information wherever you want it.

Suitable for large engines

 

 

Contoil VZD 8 

Contoil VZD 8 – Tech Data & Specs Here

An easy way to find your fuel consumption. At a glance, you have the following information: total, trip, actual fuel consumption and much more. With its digital output, the results can be transferred to a remote host.

 

 

 

 

Contoil VZP 8 

Contoil VZP 8 – Tech Data & Specs Here

For installation places where the read-out is not easy, choose this flow meter. The built-in LED gives you the function status at any time. The VZD CU is recommended for fuel calculation.

Connection to a remote calculator is possible (e.g., fleet manager).

Suitable for remote control.

 

 

Contoil VZD CU 

Contoil VZD CU – Tech Data & Specs Here

Remote calculator for the VZD/VZP series. Install the VZD Control Unit in the driver cabin and you have all the necessary information about fuel consumption every time. Even competitors' flow meters from can be connected.

 

 

 

DFM System – Suitable for small engines

Contoil DFM 8D Contoil DFM 8D – Tech Data & Specs Here

Compact 2-chamber system

Space-saving design

Built for extreme environments

 

 

 

 

Contoil DFM 8S Contoil DFM 8S – Tech Data & Specs Here

Compact 1-chamber System (2 pieces needed for differential measurement)

Designed for Engines where Supply and Return Lines are Some Distance from Each Other

Built for Extreme Environments

Suitable for Large Engines

 

 

Contoil DFM 20S Contoil DFM 20S / Contoil DFM 25S – Tech Data & Specs Here

Compact 1-chamber System (2 pieces needed for differential measurement)

Suitable for Big Agricultural and Construction Vehicles, Big River Boats, Small Vessels and Extreme Environments

Suitable for Calculation and Data-sending to Remote

 

Contoil DFM-BC (board computer) 

 

Contoil DFM-BC (board computer) – Tech Data & Specs Here

Suitable for all DFM flow meters and other manufacturers' flow meters

Total, trip, current consumption, info, service (password-protected)

Configurable input-pulse value (0.1 ml to 9.9 liter)

 

Contoil DFM 8EDM 

Contoil DFM 8EDM – Tech Data & Specs Here

Easy-to-install flow meter – just connect the pipes and the three electrical wires.

The calculated consumption will be sent as a passive pulse and a TTL pulse

 

 

 

 

DFM 8ECO 

 

Contoil DFM 8ECO – Tech Data & Specs Here

Newest Reed-Contact Technology

Easy Installation

Rugged Design

 

 

 

Contoil DFM 12ECO 

 

 

Contoil DFM 12ECO – Tech Data & Specs Here

Build up for heavy-duty engines

New design of the fluid flow

Up to 600 l/h flow

 

 

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