ACCURRA-TCD measures hydrogen from 0 to 100 %, depending on the background gas, with a platinum thermal conductivity sensor and no reference gas. Display resolution is 0.01 % and repeatability is better than 1 % of full scale.
Specifications
| Item | Specification | Notes |
|---|---|---|
| In nitrogen, air, CO2 or methane | 0 to 100 %, 0 to 3 % or 97 to 100 % | |
| In argon | 0 to 100 %, 0 to 3 % or 97 to 100 % | |
| In helium | 20 to 100 %, 20 to 40 % or 85 to 100 % | |
| In oxygen | 0 to 100 %, 0 to 4 % or 97 to 100 % | |
| Resolution | 0.01 % | |
| Repeatability | Below 1 % of full scale | Linearity below 1 % of range |
| Response time | T90 below 10 s at 0.6 LPM | |
| Sample flow | 0.6 LPM recommended | |
| Sample temperature | 5 to 45 C | |
| Power | 100 to 240 V AC, 50/60 Hz, 45 W | |
| Output | Isolated 4-20 mA, user-programmable range; Modbus RTU over RS 485 | Programmable relays for alarms, fault, pump or range ID, calibration |
From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer.
Key features
- Dual-level password protection and history of alarms and calibrations
- Programmable alarms Lo-Hi, Lo-Lo, Hi-Hi
- Output freeze or follow during calibration
How it works
Hydrogen has the highest thermal conductivity of any gas, so a thermal conductivity sensor responds strongly to it. Platinum-based sensing avoids the need for a reference gas and holds calibration well.
Typical uses are hydrogen production and filling, hydrogen purity in cooling of generators, metal processing and heat treatment atmospheres, and leak detection in safe-area enclosures. Response is fast, with T90 below 10 seconds at the recommended 0.6 LPM.
Requirements and limits
- Safe-area analyser; a single known background gas assumed.
On site: utilities and calibration gases
What to have ready at your plant before installation and commissioning.
| Item | Requirement | Notes |
|---|---|---|
| Power at the analyser | 100 to 240 V AC, 50/60 Hz, 45 W | |
| Zero gas | Zero-grade nitrogen, 99.999 % | 10 litre cylinder with regulator |
| Span gas | The measured gas at zero grade, 99.999 %: hydrogen, helium, argon or nitrous oxide | 10 litre cylinder with regulator |
| Sample at the analyser | 2 to 10 psig, 0.6 LPM, 5 to 40 °C, dust below 3 micron | Pressure and flow regulated by the user |
| Mounting | 19 inch rack or panel, in a safe area |
Selection guidance
Choose ACCURRA-TCD for hydrogen in one known background gas in a safe area. For classified areas choose ACCURRA-Hz.
Applications
Application pages where this is part of the recommended solution:
Compatible products
ACCURRA-TCD
Thermal conductivity analyser for binary mixtures of H2, He, Ar, N2 and others, with no reference gas.
View ACCURRA-TCD
ACCURRA-Hz
Process gas analyser in an enclosure certified for Gas Group IIC, Zone 1 and 2, T6.
View ACCURRA-HzHeadline filters
Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection.
View Headline filtersFrequently asked questions
What range does it cover?
0 to 100 percent hydrogen, or narrow ranges such as 0 to 3 or 97 to 100 percent; the ranges depend on the background gas.
Which backgrounds?
One of nitrogen, air, CO2, methane, argon, helium or oxygen.
Does it need a reference gas?
No.
Can I use it in a hazardous area?
Use ACCURRA-Hz.