MODEL MGD-2002 MULTI-GAS DETECTOR
OPERATIONS
OVERVIEW
The MGD-2002 Detector is a portable leak locating and pinpointing
device that detects both Hydrogen (H
2
) and Helium (He) when used as
a tracer gas in a multitude of pressurized systems. The characteristic of
being lighter than air allows both Hydrogen (H
2
) and Helium (He) to
penetrate small leaks rapidly and permeate through the densest soils
and pavements quickly. The leak can therefore be pinpointed easily
with this detector.
Our helium detector products are used today in many industries and
applications including: Military RF systems, High Voltage AC power
systems, High definition television, Chemical manufacturing, Cellular
and Analog telecommunication, and industries utilizing above and below
ground storage tanks.
THEORY OF OPERATION
The MGD-2002 Multi-Gas Detector is a 16 Bit microprocessor
controlled precision instrument that operates on the principle of
changing thermal conductivity to locate a specific tracer gas as well as
quantify its local concentration. Air, or what we term as “Air”, is actually
made up of a wide range of gasses. Some of those gasses are pure
elements, some are naturally occuring simple compounds, while others
are complex man-made compounds. Table #1 on the next page shows
a list of the twelve most abundant gasses that comprise what we term as
“AIR” . The table has been arranged in decreasing concentration order,
yet also provides other useful information such as chemical name,
chemical symbol, percent in normal air, concentration in parts per million,
parts per billion, and atomic weights.
The naturally occuring elemental gasses are Nitrogen (N
2
), Oxygen
(O
2
), Argon (Ar), Neon (Ne), Helium (He), Krypton (Kr), Hydrogen
(H
2
), and Xenon (Xe). Note that the subscript of 2 in the atomic symbol
shows that the gaseous form of the element normally occurs when it is
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