Filename:
FTC200_OEM_Englisch_1.09KD180125MPL1V05.docx
Seite
4 von 10
2.
Description
The FTC200-OEM is a highly precise and stable Thermal Conductivity
Detector (TCD). It is designed for the use as an OEM detector. Since it is
not equipped with housing it has protection class 00 and no electro-
magnetic shielding. It is not designed for the use in hazardous areas. As it
is true for any OEM product, all this is in the hands of our customers.
For indication of the signal a 0 to 10V analog output is provided. For
internal calibration, configuration and digital indication of the signal a TTL-
level RS232 communication is required. For testing purposes we offer a
RS232 to TTL level converter as well as two small windows programs for a
PC in order for perform Offset and Gain calibration.
The thermal conductivity of a gas mixture depends on the individual gas
components and on the composition of the mixture. Under certain
conditions, therefore, the concentration of individual gas components can
be determined by measuring the thermal conductivity. In other cases the
identification of certain properties of gases is of special interest e.g. for
quality control or safety reasons. Often these properties are related to the
thermal conductivity and thereby identified. The concentration can be
determined with high precision if one of the following conditions is met:
-
The gas mixture consists of only two components, for example
measuring CO
2
in N
2
or H
2
inN
2
.
-
The gas mixture consists of more than two components but only
concentrations of two components vary.
-
The thermal conductivity of two of three constituents is similar, e.g.
measuring H
2
or He or CO
2
in a mixture of O
2
and N
2
.
-
In case, a cross sensitive gas may be measured separately and the
signal of this measurement is fed into FTC200 where an internal
routine compensates the cross sensitivity.
