Specification :

Introduction

The desire for technical process with respect to safety, together with optimum availability and economy in closed plants, has led to considerable improvements in the flame monitoring and analysis sectors as well. The task was to create a method of flame monitoring which would reliable monitor the hot gas and acid gas flames under all kinds of difficult operating conditions. Because of the complex interdependency of the physical and chemical process involved, criteria must be chosen for the combustion process that can be used as parameters for accomplishing this task.

Principle

During combustion, energy is released in the form of electromagnetic radiation; this radiation is distributed over a wide spectrum depending on the fuel and is defined by specifying the wavelength. The radiation intensity pulsates when oxygen permeates the fuel; at the same time, amplitude modulation of the radiation occurs.

Flame monitoring

Electromagnetic radiation can be converted by radiation receivers into a measurable electrical quantity in accordance with an established physical law. As a rule one can distinguish between photoelectric and thermal detectors.
Thermal detectors are in principle uniformly sensitive over the entire radiation spectrum and can be made selective for specific ranges of wavelengths by secondary effects, as for example with spectral filters. Combustion of H2S creates a powerful absorption range between 270 and 400 nm. This is the reason, moreover, why it has not been possible to satisfactorily receive these with ultraviolet instruments.

The new method also makes use of the phenomenon that, as a result of the recirculating combustion gases in the flame envelope, their temperature exhibits not only fluctuations in time but above all local fluctuations. By measuring the difference in radiation intensity at two selected points, the constant signal can now be completely eliminated. Even in the low-load range, the signal amplitude resulting from the existence of the flame is many times greater than that produced when there is flame failure.

Features

  Fail-safe, self-monitoring
  Suitable for intermittent and c ontinuous operation
  TÜ V tested
  ATEX approved
  DVGW, DIN-CERTCO, CSA and UL approved
  Approved acc. to EN 230 and EN 298
  Fully electronic design
  Degree of protection IP65
  Flame monitoring in the spectral range from 250nm to 7000nm, depending on application and type
  Cable lengths of up to 1000 m without additional drivers
  Also available with EX-protection
  Wide range of accessories, such as adjustment devices and heat insulators