Fuji Electric, Hydrogen Analyzers Thermal Conductivity Gas Analyzer - ZAF4

The analyzer continuously measures the concentration of gases such as H2, He, and Ar with high stability. A flame proof version is available (ZAFE) for countries outside of European Union (No CE Mark).
  

Fuji Electric HYDROGEN ANALYZERS THERMAL CONDUCTIVITY GAS ANALYZER principle.

This thermal conductivity gas analyzer measures gas concentration by utilizing the difference of thermal conductivities between two gas components. In the detector, there are a reference chamber and a measuring chamber, in each of which a thin platinum wire is stretched. The reference chamber is filled with reference gas. The sample gas is flowed through the measuring chamber. Each platinum wire composes a bridge circuit in combination with an external fixed resistor, and is heated by flowing a constant current. When there is a change in the concentration of the component under measurement, the thermal conductivity of sample gas will change to affect the temperature of the platinum wire in the measuring chamber. The resulting thermal change is taken out as a change in electric resistance, according to which the concentration of measured gas is calculated.


Features:
- Easy-to-see large LCD is helpful for efficient operation.
- Line voltage lies within 100 V to 240 V AC, 50/60 Hz.
- Zero point and span can be automatically calibrated
- RS-232C MODBUS TM communication
- Flame proof  version available for countries outside of European Union (No CE Mark)
- Interference compensation
- Concentration alarm

Applications:
- H2 monitoring in semiconductor manufacturing equipment, hydrogen generation equipment, calcining furnaces
- Ar, He, CH4 measurement in gas generation plants
- He measurement in superconducting devices
- Ar measurement in air-separation plants

Fuji Electric hydrogen analyzers main applications.

- H2 concentration measurement for semiconductor equipment.
- H2 concentration measurement for hydrogen generator.
- H2 concentration measurement for kiln.
- Ar, He or CH4 concentration measurement for gas generation plant.
- He concentration measurement for super-conducting equipment.
- Ar concentration measurement for air separation plant.

Thermal conductivity ratio of gases.

Measuring Principle.
This thermal conductivity gas analyzer measures gas concentration by utilizing the different thermal conductivities of 2 gas components. In the detector, there are reference and measuring chambers in each of which a thin platinum wire is stretched. The reference chamber is filled with reference gas and through the measuring chamber, sample gas is flowed. Each platinum wire composes a bridge circuit in combination with an external fixed resistor, and it is heated by flowing a constant current. When there is a change in the concentration of the component under measurement, the thermal conductivity of sample gas will change to affect the temperature of the platinum wire in the measuring chamber. The resulting thermal change is taken out as a change in electric resistance, according to which the concentration of measured gas is calculated.