A heightened level of reliability and safety for integration into flame sensor measurement instruments
Feb 26 2020 Read 193 Times
When organic substances such as wood, natural gas, petrol and various plastics catch fire, spectral radiation of typical wavelengths is emitted. As a specialist in flame detection technology, InfraTec is expanding its range of specialised detectors that detect radiation in precisely this area. The new, miniaturised, multi-channel LRM-274 detector stands out because, as a low power detector, it requires only one unipolar supply voltage.
The power consumption of these new detectors, often referred to as single supply detectors, is several times lower than that of conventional standard models. They are particularly suitable for operation in industrial fire protection and early fire detection devices. The thermal compensation of the LRM‐274 ensures stable operation even in the event of severe temperature fluctuations.
To further improve levels of efficiency, a new feature has been included in an InfraTec detector for the first time. The LRM-274 features integrated heating resistors, with which users themselves test the detector, if necessary, thus testing the complete signal chain, as well as the components. This ensures a significant degree of additional safety especially when used in flame sensors. This enables operators to clearly determine at any time whether the respective measurement device is still functioning correctly.
The LRM‐274 is preconditioned for easy integration into appropriate equipment environments. The operational amplifiers used during signal processing work within a range from 2.7 V to 5.0 V. This allows the detector to be easily integrated into the voltage range of the subsequent processor. Apart from this, due to its thermal compensation, it requires only a very small voltage reserve. An excellent ratio between useful signals and interference signals also makes it resistant to interferences.
In addition to its low energy consumption, InfraTec’s latest innovation is further enhanced by a very large field of view. Symmetrical and more than 90 ˚ wide, this enables the detection of flames at constant signal ratios even for large angles of incidence. In addition, sensitive elements with a particularly large size of (2 × 2) mm2 ensure a high signal‐to noise ratio. This results in tremendous performance, which can be measured by tangible data, such as the value of the specific detectivity D*. The quad channel detector belongs to the series of PYROMID® detectors. With this detector, users can measure three absorption bands simultaneously and also use a reference channel. The TO8 housing (Ø 15.2 mm) of the LRM‐274 has a robust aperture window of approximately (8.5 × 8.5) mm2, which protects the detector from external influences. Its miniaturised design and optional hermetic seal support easy integration into existing systems.
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