Gas detectors, Gas Analyzers and Gas Sensors can output gas measurement of the gases detected in a number of ways. These include percent LEL, percent volume, trace, leakage, consumption, density, and signature or spectra.

The lower explosive limit (LEL) or lower flammable limit (LFL) of a combustible gas is defined as the smallest amount of the gas that will support a self-propagating flame when mixed with air (or oxygen) and ignited. In gas-detection systems, the amount of gas present is specified in terms of % LEL 0% LEL being a combustible gas-free atmosphere and 100% LEL being an atmosphere in which the gas is at its lower flammable limit.

The relationship between % LEL and % by volume differs from gas to gas. Also called volume percent or percent by volume, percent volume is typically only used for mixtures of liquids. Percent by volume is simply the volume of the solute divided by the sum of the volumes of the other components multiplied by 100%. Trace gas sensors given in units of concentration: ppm. Leakage is given as a flow rate like ml/min. Consumption may also be called respiration. Given in units of ml/L/hr.

Density measurements are given in units of density: mg/m^3. A signature or spectra measurement is a spectral signature of the gases present; the output is often a chromatography.

GAS DETECTORS & ANALYSERS SPECIFICATIONS

• Detects all CFC refrigerants such as R-22, R-124, R-11 and R-12

• The ultra-sensitive long life sensor detects the more current, difficult-to-detect HFC refrigerants such as R-134a, R-404A, and new R-22 replacements, R-410A and R-407C.

• It’s long, slim gooseneck probe design is easy to use in close areas and for extending into hard-to-reach areas.

• It’s adjustable alarm, easy one-hand operation and impact resistance storage case add up to value and convenience

• Sensitivity to detect: 100ppm of R-134A/R-22

• Response Time < 2 sec

• Audio and Visual Alarm