DID Gas Chromatograph - Helium
Analysis of H2, Ne, O2+Ar, N2, Kr, CH4, CO, CO2 and Xe in Helium, Argon, Hydrogen, Nitrogen, Oxygen, Carbon Dioxide, Krypton and Xenon (other gases possible on request)
General
The DID Gas Chromatograph has been designed to make use of the variations in electrical conductibility found in highly ionised gas. The ionisation is created by a single high frequency discharge within the detector (HF Plasma), causing a high energy photon emission (24.5 eV). This emission is capable of ionising all the gases within the cell with the exception of the Helium.
Principle
One of the biggest advantage of our DID Gas Chromatograph is that a photo-ionised discharge is achieved without any radioactive emissions and without the need to apply excessive voltage being applied to the cell.
Another important characteristic of the DID Gas Chromatograph is that the detector operates using just one gas. This one gas is used as the carrier, the flushing gas and/or the purging gas. This gas can also serve to purge and clean all the valves.
The housing does not require flushing gas: no contamination of the gas circuit is possible before detection as the input connection is located directly on the cell of the DID Gas Chromatograph detector.
The power setting of the high frequency oscillator allows for the adjustment of the detector sensitivity, which can reach 0.1 ppb (parts per billion).
The detection limit and any background noise and directly related to the quality of the carrier gas, so the use of ultra purity (UHP) Helium as the carrier gas is highly recommended.
Some Global References
| Company | Type of analyser | Model | Measurement |
|---|---|---|---|
| Linde (China) | Helium | DID | H2, Ne, O2+Ar, N2, CH4 |
| Air Liquide (France) | Oxygen | DID | N2 |
| Linde Worms (Germany) | Argon | DID / Orthosmart | H2, O2, N2, CO, CO2, CH4, NMHC |
| Linde (Germany) | Nitrogen | DID+FID | H2, O2, Ar, CH4, CO, CO2, NMHC |
| Air Liquide (France) | Krypton | DID | H2, O2+Ar, N2, Xe |
Technical specifications
| Accuracy | Range and application dependent |
| Drift | <1 % over 24 hours |
| Temperature drift | <1 % per degree |
| Operating temperature | Around 20°C without wide variations of temperature |
| Sampling gas | He, N2 , H2, O2, Ar, CO2 , Kr, Xe |
| Sample gas connection | 1/8’’ Swagelok OR 1/8’’ VCR. |
| Sample flow rate | Approximately 3 to 5 l/h |
| Sample pressure | Atmospheric pressure |
| Carrier gas | Helium |
| Carrier gas connection | 1/8’’ Swagelok OR 1/8’’ VCR. |
| Carrier gas pressure | 7 bar |
| Carrier gas flow rate | 4 l/h |
| Recommended quality | minimum 6.0 |
| Power supply | 220 Vac, 50-60 Hz |
| Power consumption | 420 VA |
| 4-20 mA output | Eight confi gurable outputs depending on the application. |
| RJ-45 connection | Computerised system maintenance |
| Output relays (SPST 2 amperes / 250 Vac) | 1 Analyser Failure Alarm contact 1 Alarm High contact 1 Alarm High High contact |
Measurement capabilities
| Argon | Hydrogen | Nitrogen | Oxygen | Helium | |
|---|---|---|---|---|---|
| CH4 | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb |
| CO | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb |
| H2 | < 10 ppb | / | < 10 ppb | < 10 ppb | < 10 ppb |
| N2 | < 10 ppb | < 10 ppb | / | < 10 ppb | < 10 ppb |
| O2 + Ar | / | < 10 ppb | < 10 ppb | / | < 10 ppb |
| O2 | < 10 ppb | < 10 ppb | < 10 ppb | / | < 10 ppb |
| Ar | / | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb |
| CO2 | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb | < 10 ppb |
| Ne | < 100 ppb | ||||
| Kr | < 10 ppb | ||||
| Xe | < 10 ppb |
Dimensions & chromatogram
(Dimensions can differ regarding the application)
Features
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