MISSION HYDROGEN
Hydrogen, like any other gas, has a specific thermal conductivity (TC) value. The FTC for measuring the thermal conductivity recognizes exactly one of the two gases in a binary or quasi-binary (or pseudo-binary) gas mixture.
FTC series gas analyzers can be used to measure hydrogen in the following binary gas mixtures:
| measured gas | carrier gas | Base-MR | smallest MR |
Smallest MB with suppressed zero point |
|---|---|---|---|---|
| hydrogen (H2) | nitrogen (N2) or air |
0% – 100% | 0% – 0.5% | 98% – 100% |
| hydrogen (H2) | argon (Ar) | 0% – 100% | 0% – 0.4% | 98% – 100% |
| helium (He) |
argon (Ar) | 0% – 100% | 0% – 0.5% | 98% – 100% |
| nitrogen (N2) | hydrogen (H2) | 0% – 100% | 0% – 2% | 99.5% – 100% |
| hydrogen (H2) | helium (H2) | 20% – 100% | 20% – 40% | 85% – 100% |
| hydrogen (H2) | methan (CH4) | 0% – 100% | 0% – 0.5% | 98% – 100% |
| hydrogen (H2) | carbon dioxide (CO2) | 0% – 100% | 0% – 0.5% | 98% – 100% |
| hydrogen (H2) | oxygen (O2) | 0% – 100% | 0% – 0.5% | 97% – 100% |
Hydrogen, like any other gas, has a specific thermal conductivity (TC) value. The FTC for measuring the thermal conductivity recognizes exactly one of the two gases in a binary or quasi-binary (or pseudo-binary) gas mixture.
The sensor uses special thermistors as part of a Wheatstone bridge. The entire setup is thermostated to ensure isothermal conditions.
The measuring gas flowing through extracts heat from the thermistor, which is readjusted with electrical current. This additional current is measured with high precision and serves as a measure of the thermal conductivity.
The FTC thermal conductivity analyzers can measure gas concentrations over the range of 0-100% of a sample gas in a background gas. Other measuring ranges, including ppm measuring ranges, can be achieved under very constant pressure and temperature conditions.
The two gases in the binary gas mixture may be pure gases - e.g. For example, nitrogen or hydrogen - or represent a pseudo-binary gas mixture. For example, air is a pseudo-binary gas because the proportions of nitrogen and oxygen are fixed and their TC values are similar, so they behave like a single gas.