Thermal Conductivity Gas Analyzer (ZAF)
H2 continuous measurement with high accuracy with high accuracy
Measurable gas components H2、Ar、He、CH4、CO2
- Continuous measurement and real-time monitoring
- Operation by anyone using the display guide
- Lightweight and compact design to install anywhere
Applications
- Research facilities using hydrogen gas
- Monitoring of reductive atmosphere in industrial furnaces
- Semiconductor equipment (H2)
- Hydrogen generators (H2)
- Firing furnaces (H2)
- Gas generating plant (Ar, He, CH4)
- Superconducting equipment (He)
- Air separation plants (Ar)
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.
Gas sampling system diagram
Specifications
| Principle | Thermal conductivity |
|---|---|
| Components | He, Ar, H2, CH4, CO2 |
| Range | H2: 0–3 ‥‥ 100%, 100–90%, 100–80% He: 0–5 ‥‥ 100%, 100–90%, 100–80% Ar: 0–10 ‥‥ 100%, 100–90%, 100–80% CH4: 0–20 ‥‥ 100%, 100–80% |
| Display | LCD with back light |
| Display | 4-digit |
| Power supply & consumption | 100–240 V AC, 50/60 Hz, approx. 50 VA |
| Mounting | Panel mount |
| Dimensions (H x W x D) in mm | 240 × 192 × 213 |
| Weight | Approx. 5kg |
| Repeatability | ±1%FS |
| Drift | Zero point: ≤ ±2% FS per week (H2measurement) Span point: ≤ ±2% FS per week (H2measurement) |
| Response speed (90% response) |
Standard: ≤ 60 s (at flow rate 0.4 L/min) High speed: ≤ 10 s (at flow rate 1 L/min) allowed only for H2 measurement (reference gas N2) |
