• Electronic compound, up to 5 channels
  • Mixed combustion with up to 2 out of 3 fuels
    with flying change
  • Connects to control system
  • Simple to program
  • 10-bit resolution
  • Can be operated from PC
  • Optional load regulator
  • Integrated O2 controller
  • Type-examination tested
Tecnical Data
Power supply:230 VAC +10 % -15 % 50/60 Hz
115 VAC +10 % -15 % 50/60 Hz (optional)
Ambient temperature
+0 °C … +60 °C
Ambient temperature
Transport and storage:
-25 °C … +60 °C
Resolution per analogue input:999 digit, 10 bit
Three-point step Recommended run time of the servomotor:30 s … 60 s
Continuous output: Apparent ohmic resistance:0 … 10 V > 5 kΩ
0/4 … 20 mA < 600 Ω
Digital signal input:16 via floating contact
24 VDC or optional via 230 V module type 660R0018
Number of curve set:2 per channel (e.g. for oil/gas dual-fuel burner) optional 4 or 8
BUS connection:

Via 25-pole Sub-D socket

BUS card for the following systems:

  • INTERBUS-S (Phoenix)
  • Modbus
  • Ethernet (Modbus TCP)














EC Type Examination Certificate (Modul B), according to Directive 2014/68/EU

  • DIN EN 298:2012
  • DIN EN 1643:2001
  • DIN EN 230:2005
  • DIN EN 60730-2-5:2011
  • DIN EN 12067-2:2004-06
  • DIN EN 50156-1:2005, point 10.5

SIL 3 Confirmation

  • DIN EN 61508:2011, Parts 2+3

EC Declaration of Conformity

  • 2014/35/EU (Low Voltage Directive)
  • 2014/30/EU (EMC Directive)
  • 2014/68/EU (Pressure Equipment Directive Cat. 4 Mod. B+D)
  • 2009/142/EC (Gas Appliances Directive)

Universal electronic fuel and air ratio control unit (VMS) for all types of combustion systems. TÜV-tested, licensed for TRD 604 installations. The VMS is the VR4 ratio controller’s successor. It includes the electronic fuel and air ration control system with 4 or 5 servo outputs. The analogue inputs have 10-bit resolution. This permits actuator accuracy of < 0.1° with a 90° motor.
All operational and error messages are displayed in plain text. Up to 20 points can be input per curve. The unit’s configuration can be changed on site through password-protected parameters. In the standard configuration, the unit has 2 curve sets (e.g. for oil and gas); 4 or 8 curve sets are available as options. The options of introducing corrections have been widely extended. This further improves the ability to implement special installations.

The unit has a PC interface. Curve and parameter data can be saved by means of a Windows based program. As a result, the VMS can be remote-controlled and the curves represented graphically. A demo version of this remote control and remote display software is available at download register.  

In addition, the VMS has a LAMTEC-SYSTEM-BUS interface for linking to other new-generation LAMTEC instruments, such as LT1 / LT2 Lambda transmitters for measuring the O2 content of flue gas and for optimizing combustion.

The VMS can be connected to the control system via standard bus systems.

Other features:

  • The last 10 faults are stored and can be called up at any time
  • Integral, fuel-referenced operating hours and start-up counter
  • Direct link to a Namur sensor for measuring revolution speeds in rev. speed control systems (optional)
  • Optional integral output regulator with special functions, such as start-up and shutdown capabilities and weather control

All these innovations notwithstanding, the operating method has remained the same as in the VR.

Curve input is just as simple in the VMS as in its predecessor. A graphic representation of the most important options and functions is shown in selection criteria.

Selection Criteria
Function  Communication  Optional


  Start-up counter



  RS232 interface

• Operating Maintaining
• Remote control
• Storage CO/O2 control



  CO/O2 control



  Operating hours counter



  LAMTEC System Bus (LSB)



  Burner firing-rate



  Compound regulator
  • 4 or 5 positioning elements     
  • 2, 4 or 8 curve sets




  Control instrumentation connection –  

• CAN Bus
• Profibus
• Modbus
• Ethernet



  Frequency converter 




  (Web visualisation)