ACCURRA-TCD measures argon in a binary mixture by thermal conductivity with no reference gas. It works very well against helium or hydrogen and moderately against nitrogen. For oxygen or CO2 impurity in argon, use ACCURRA-S instead.
Specifications
| Item | Specification | Notes |
|---|---|---|
| Gas | Argon in a binary mixture | |
| Sensor | Platinum thermal conductivity | |
| Repeatability | Below 1 % of full scale | Linearity below 1 % of range |
| Errors and drift | Below 1 % of full scale per week | |
| Response time | T90 below 10 s at 0.6 LPM | |
| Reference gas | Not required |
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
- Binary argon measurement
- Isolated 4-20 mA, programmable alarms, Modbus RTU
- No reference gas
How it works
Argon conducts heat roughly a third less well than nitrogen, so an argon and nitrogen mixture gives a clear but modest signal, and argon in helium or hydrogen gives a very strong one. The analyser's range is chosen to suit.
Typical uses: argon purity at air separation and filling plants, argon in furnace and welding atmospheres, argon-nitrogen blends. Argon and oxygen have similar thermal conductivity, so oxygen in argon is better measured with an oxygen sensor; use ACCURRA-S for oxygen impurity in argon.
Requirements and limits
- Binary mixtures only.
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 argon as the main component of a binary mixture, and ACCURRA-S for trace impurities in argon such as oxygen, CO2 and moisture.
Applications
Application pages where this is part of the recommended solution:
- Gas purity certification and cylinder filling
- Welding and laser gas mixtures
- Semiconductor and electronics gas purity
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-S
Online analyser for trace, percent and purity O2, CO, CO2, CH4 and dew point; can measure two gases from one sample.
View ACCURRA-SHeadline filters
Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection.
View Headline filtersFrequently asked questions
Can it measure oxygen in argon?
Argon and oxygen have similar conductivity; use an ACCURRA-S oxygen model for oxygen impurity.
Does it need a reference gas?
No.
What about argon-CO2 mixes?
Argon in CO2 is listed on wide ranges only, 40 to 100 or 80 to 100 percent, because the two conduct heat similarly. Low levels of CO2 in argon are better read by NDIR on ACCURRA-S 6030.
Which backgrounds?
Nitrogen, air, oxygen, carbon dioxide or xenon, one at a time.