DEGA NB III LCD

The DEGA NB III LCD gas detector is designed for simple applications where the concentration of dangerous explosives or toxic substances can occur.

The detector is not intended for detection in industrial and commercial areas requiring ATEX certification or in areas with an “Ex” explosion hazard. We recommend DEGA NS II LCD RE (zone 2) or DEGA NS III LCD RE (zone 1) for these areas.

Basic gas detection methods:

CL – catalytic sensor (Pelistor) They operate on the principle of catalytic combustion – gas concentration is measured based on the amount of heat released in a controlled combustion reaction. The reaction is supported by a suitable temperature and the pressence of a catalyst. These sensors can be used to detect a broad range of flammable gases. The sensors are characterized by fast response,a long lifetime and high stability. A minimum of 10 % of oxygen in the air is required for it’s proper function.

EL – electrochemical sensor They operate on the principle of change of electrical parameters on the electrodes stored in electrolyte, due to oxidation/reduction reactions of the detected gas on it’s surface. These sensors have good selectivity and the ability to detect very low concentrations of toxic gases.

IL – infrared sensor The top quality scanning method. They operate on the principle of infrared spectroscopy. The sensors have excellent selecivity in organic matter, do not require any oxygen in the atmoshpere and are resistant to catalyst poisons (sulfur and silicon compounds) which cause a change of sensitivity of catalytic sensors. The sensors are characterized by high stability and a long lifetime.

SL – semiconductor sensor They operate on the principle of changes in electrical conductivity of semiconductors by changing the concentration of the detected gas. Their advatage is a long lifetime in a clean environment and a wide range of different types of gases and vapors. Their disadvatage is their low selectivity – the sensor largly responds to other gases for which it is not calibrated.

PID – photoionization sensor The sensitive scanning method for detection of a wide range of VOC – volatile organic compounds. The sensor does not selectively detect all VOCs in the air at concentrations in ppm.