Products
Fixed thermal conductivity hydrogen purity analyzer. 0–100% measurement range, explosion-proof rated, 4–20mA/RS485 output.
Lead time: 6–8 weeks
What is a TCD Purity Analyzer?
A thermal conductivity (TCD) purity analyzer measures hydrogen concentration by exploiting the fact that different gases conduct heat at different rates. Hydrogen has an exceptionally high thermal conductivity compared to air, nitrogen and most other process gases — making thermal conductivity an effective and robust method for measuring hydrogen purity across the full concentration range, from trace levels to near-100% pure hydrogen.
The analyzer uses a platinum wire sensing element arranged in an unbalanced bridge circuit. One arm of the bridge is sealed with a reference gas corresponding to the lower limit of the measurement range; the other arm is exposed to the sample gas. When the sample matches the reference, the bridge remains balanced and the output reads zero. As hydrogen concentration increases, the bridge becomes unbalanced in proportion to the gas concentration — this signal is amplified, filtered and processed to display the hydrogen concentration directly.
TCD analyzers in this range are built for continuous, unattended operation — fixed installation with a robust carbon steel or stainless steel enclosure, explosion-proof rating for hazardous area deployment, and multiple output options (4–20mA, RS485, relay) for integration with plant control systems, SCADA and alarm logic. Typical applications include hydrogen-cooled generator monitoring, electrolytic hydrogen production verification, ammonia synthesis gas analysis, air separation systems and any process where continuous hydrogen purity verification is required for safety or quality control.