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For flammable gases, such as H
2
, CH
4
, etc., the use of a FTC320 with the option
“glass-beads filling“ is strongly recommended. If a mixture of a combustible gas with an
inert gas is present in a mixing ratio such that even adding any amount of air will not make
the mixture explosive, it is called totally inert. Totally inert gas mixtures may be introduced
into a FTC320 device without glass ball filling.
“Basic range“ is the largest possible measuring range and is set by default. The lineariza-
tion is performed over the basic range. The smallest measuring ranges at the beginning
and the end of the basic range are facilitated through specific calibration. The smallest
possible range between the basic range and the smallest ranges at the end beginning and
the end of the range can be estimated by linear interpolation.
The Multi Gas Mode (MGM) is a configuration that allows for the consecutive mea-
surement of different gas pairs. The gas pair can be switched through the control panel
or via the RS232-interface. Gas pairs labeled “Yes“ in Table 2.1 are commonly used. Gas
mixtures labelled “On request“ can also be implemented upon request.
2.2 FTC320 Detector Unit
The FTC320 is a highly precise and stable Thermal Conductivity Detector (TCD) that is designed for
use as a gas detector. The unit consists of a hermetically sealed pressure proof stainless-steel block
with a gas duct, which is suited for pressures up to 20 bar. Sample gas entering through the gas inlet
is guided to the micro-mechanical thermal conductivity sensor and further downstream to the outlet
port. The pneumatics are designed to minimize the influence of a changing gas flow. The operating
temperature of 63
◦
C is stabilized by a highly accurate PI control loop.
In order to avoid electrical interference on the measuring output, the high-performance analog adaption
circuit is directly mounted on top of the stainless-steel block. The Processor board digitizes the signal in
a 24bit A/D converter. The micro-controller performs all calculations, such as linearization, calibration,
and cross sensitivity compensation directly on the detector unit.
File name:
FTC320Ex Operating Manual_1.09KD201009MPO3V04.pdf
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