Overview
Thermal conductivity gas analyzer is an effective method to measure one of two components in a gas mixture (the thermal conductivities differ a lot). Mainly used to measure the content of hydrogen (H2), carbon dioxide (CO2), argon (Ar), etc. Suitable for binary or quasi-binary gas mixtures.
Principle
When the sample gas enters the measuring cell, which is tempered to a constant temperature of 63 °C, a thermistor is regulated to a constant temperature of 135°C via a membrane. Above and below the membrane are small cavities. The sample gas can diffuse through. The heat loss caused by the thermal conductivity of the sample gas is compensated by heating, and the voltage required to maintain a constant temperature of the membrane is the measure of the thermal conductivity of the gas, or gas mixture.
Applications
- Measurement of hydrogen (H2) content in synthesis gas of ammonia plant
- Purity measurement of hydrogen (H2) in hydrogenation unit
- Measurement of oxygen (O2) in pure hydrogen (H2) and hydrogen (H2) in pure oxygen (O2) in the process of producing hydrogen by electrolysis of water and oxygen
- Hydrogen (H2) content measurement in hydrocarbon gas
- Monitoring of hydrogen (H2) and carbon dioxide (CO2) content in hydrogen-cooled generator sets
- Measurement of hydrogen (H2) in chlorine (Cl2) in the chlorine production process
- Measurement of chlorine (Cl2) in the chlorine production process
- Measurement of carbon dioxide (CO2) content in flue gas of furnace combustion
- Argon (Ar) content measurement in air separation plant
- Monitoring in the production of pure gases, such as helium (He) in nitrogen (N2) and argon (Ar) in oxygen (O2)
- Sulfur dioxide (SO2) content measurement in the production process of sulfuric acid and phosphate fertilizer
Features
- Corrosion protection: Sensor surface is coated with Polymer layer(4µm) which will not affect the excellent measurement performance of the sensor unit.
- Condensation and dust protection: The sintered glass with µm-sized holes is used to protect the sensor so that gas molecules can pass through, but liquid water molecules are not permeable.
- Multiple gas measurement modes: The analyzer has 16 built-in binary mixed gas measurement modes and calibration curve.
- High corrosion resistance Optional: Sensor is made from Al2O3, glass and SiO2 coated Pt filaments, and Gas connections in PTFE, PFA
- High temperature Optional: Sensor is be used at higher temperatures up to 180°C
Measurement components and ranges
|
Measuring Gas |
Carrier Gas |
Basis Range |
Smallest Range |
Smallest Suppressed Zero Range |
|
Hydrogen (H2) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 0.5% |
98% – 100% |
|
Oxygen (O2) |
Nitrogen (N2) |
0% – 100% |
0% – 15% |
85% – 100% |
|
Helium (He) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 0.8% |
97% – 100% |
|
Carbon dioxide (CO2) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 3% |
96% – 100% |
|
Nitrogen (N2) |
Argon (Ar) |
0% – 100% |
0% – 3% |
97% – 100% |
|
Oxygen (O2) |
Argon (Ar) |
0% – 100% |
0% – 2% |
97% – 100% |
|
Hydrogen (H2) |
Argon (Ar) |
0% – 100% |
0% – 0.4% |
99% – 100% |
|
Helium (He) |
Argon (Ar) |
0% – 100% |
0% – 0.5% |
98% – 100% |
|
Carbon dioxide (CO2) |
Argon (Ar) |
0% – 60% |
0% – 10% |
— |
|
Argon (Ar) |
Carbon dioxide (CO2) |
40% – 100% |
— |
80% – 100% |
|
Methane (CH4) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 2% |
96% – 100% |
|
Methane (CH4) |
Argon (Ar) |
0% – 100% |
0% – 1.5% |
97% – 100% |
|
Argon (Ar) |
Oxygen (O2) |
0% – 100% |
0% – 3% |
96% – 100% |
|
Nitrogen (N2) |
Hydrogen (H2) |
0% – 100% |
0% – 2% |
99.5% – 100% |
|
Oxygen (O2) |
Carbon dioxide (CO2) |
0% – 100% |
0% – 3% |
96% – 100% |
|
Hydrogen (H2) |
Helium (He) |
20% – 100% |
20% – 40% |
85% – 100% |
|
Hydrogen (H2) |
Methane (CH4) |
0% – 100% |
0% – 0.5% |
98% – 100% |
|
Hydrogen (H2) |
Carbon dioxide (CO2) |
0% – 100% |
0% – 0.5% |
98% – 100% |
|
Sulfur hexafluoride (SF6) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 2% |
96% – 100% |
|
Nitrogen dioxide (NO2) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 5% |
96% – 100% |
|
Hydrogen (H2) |
Oxygen (O2) |
0% – 100% |
0% – 0.8% |
97% – 100% |
|
Argon (Ar) |
Xenon (Xe) |
0% – 100% |
0% – 3% |
99% – 100% |
|
Neon (Ne) |
Argon (Ar) |
0% – 100% |
0% – 1.5% |
99% – 100% |
|
Krypton (Kr) |
Argon (Ar) |
0% – 100% |
0% – 2% |
96% – 100% |
|
Extinguishing gas (R125) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 5% |
98% – 100% |
|
Deuterium (D2) |
Nitrogen (N2) or Air |
0% – 100% |
0% – 0.7% |
96% – 100% |
|
Deuterium (D2) |
Helium (He) |
0% – 100% |
0% – 5% |
70% – 100% |
Specifications
|
Measuring principle |
Thermal conductivity (TCD) |
|
Display |
1.8" industrial color LCD, 160*128Pixel |
|
LED Light |
Status LED Light |
|
Linearity |
< 1% of range |
|
Repeatability |
< 1% of range |
|
Sensitivity |
0.02% |
|
T90-time |
<1sec at flow rate higher 60l/h |
|
Power |
19 ~ 28V DC Power |
|
Analog Output |
4~20mA |
|
Relay Output |
3 Relays, NO, 5A 250VAC/30VDC |
|
Communication |
RS485, MODBUS RTU |
|
Electrical protection |
EMI / RFI CEI-EN55011 – 05/99 |
|
Flow rate |
40l/h to 150l/h; 60l/h -80l/h recommended |
|
Process Pressure(Max.) |
10Bar |
|
Temperature Range |
-40 ~ 85℃ |
|
Humidity Range |
0~95%RH (non-condensing) |
|
Process Connection |
G3/8 screw or 6mm tube |
|
Ambient Temperature |
-15 ~ 60℃ |
|
Housing Material |
Aluminum and Stainless steel |
|
Explosion-proof !!OPTIONAL!! |
Exd IICT4 Controller optional, on request |