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EDS3-127C Datasheet(PDF) 4 Page - Fuji Electric |
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EDS3-127C Datasheet(HTML) 4 Page - Fuji Electric |
4 / 8 page 4 ZAF-3 MEASURING PRINCIPLE Fixed resistor DC amplifier Sample gas DC constant current Measuring chamber Reference chamber This thermal conductivity gas analyzer measures gas con- centration 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 ref- erence gas and through the measuring chamber, sample gas is flowed. Each platinum wire composes a bridge cir- cuit 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 af- fect 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 con- centration of measured gas is calculated. Thermal Conductivity Ratio of Gases Measured gas Reference gas component (Note 1) He Ar CH4 CO2 Measurable range Range ratio(Note 2) 0 to 5, 10, 20, 30, 40, 50, 80, 100% 100 to 90, 100 to 80% 1 : 10 N2, (CO2, Ar) O2, Air 0 to 10, 20, 50, 80, 100% 100 to 90, 100 to 80% 1 : 5 N2, O2, Air, (He) H2 0 to 3, 5, 10, 20, 50, 80, 100% 100 to 90, 100 to 80% 1 : 10 N2, (CO2, Ar, He) 0 to 10, 20, 50, 100% 100 to 90, 80% 1 : 5 N2, O2, Air, (He) 0 to 20, 40, 50, 60, 80, 100% 100 to 80% 1 : 5 N2, (CO2, Ar, He) (Note 1) Contact us for the components in the parentheses. H2 contained in O2 cannot be measured. (Note 2) Range ratio stands for maximum value. Gases Comparative thermal conductivity (0 °C) when replacing thermal conductivity of air (2.41 x 10 -2 w/(m.k) with 1 Sulfur dioxide gas SO2 Carbon dioxide gas CO2 Argon Ar Carbon monoxide CO Steam (100 °C) H2O Air Nitrogen N2 Oxygen O2 Methane CH4 Hydrogen H2 Peltier gas cooler (Note 2) (Note 2) Sample gas (Note 1) Gas aspirator Flow checker 0.4L/min or 1L/min (Note 3) 1L/min Membrane filter Mist filter Mist filter Exhaust Purging air or nitrogen Drain pot ZAF (Note 1) Dust must be purged adequately (for protection of the pump, flowmeter, etc.). (Note 2) Unnecessary if sample gas is dry. (Note 3) Select the one with no pulsating flow within the specified flow rate range. Solenoid valve Pressure reducing valve Span gas Zero gas Span calibration signal Suction pump OFF signal in automatic calibration Zero calibration signal Example of gas measurement in industrial furnace, sintering furnace, etc. Table 1: Measurable Component and Measurable Range GAS SAMPLING SYSTEM DIAGRAM (EXAMPLE) |
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