Thermox - Model 120HD -Portable Hydrogen Analyzer
Measures the hydrogen concentration in a gas sample and then digitally reports the percent volume of hydrogen in air. The 120HD analyzer functions as a katharometer. It operates by having two parallel tubes that both contain gas and heating coils. The gases are examined by comparing the rate of loss of heat from the heating coils into the gas. The coils are arranged in a bridge circuit so that resistance changes due to unequal cooling can be measured.
One channel contains moisture-saturated air and the mixture to be tested is passed through the other channel. Hydrogen has a much higher thermal conductivity than air and so the 120HD analyzer is very sensitive to hydrogen, but it will also respond to any gas whose thermal conductivity is different from that of air.
- Battery operated and fully portable
- Non-destructive: sample can be used after analysis
- All wetted surfaces are stainless steel.
- Measurement unaffected by changes in ambient temperature or pressure
- Factory calibrated
- Operating Principle: Katharometer
- Operating Range: 0 to 25% hydrogen in water-saturated air
- Accuracy: ±4% full scale (±1% H2 v/v)
- Response Time: < 1 minute for 90% step change
- Repeatability: ±2% full scale (±0.5% H2 v/v)
- Environment: Ambient Temperature: 50ºF to 100ºF (10ºC to 38ºC)
- Relative Humidity: 0% to 100%
- Shock Test: MIL-S-901D (Navy) Grade B
- Recommended Sample Gas Flow Rate: 50 ml/min
- Sample Pressure: 5 psi (34 kPa) gauge maximum
- Power Supply: (1) 6V Industrial Alkaline Lantern Battery
- Battery Life (approx.): 120 hours minimum with backlight
- Power Drain: 210 mA, 6V (with backlight), 170 mA, 6V (without backlight)
- Weight: Less than 15 lb with battery