DID Argon Gas Chromatograph
Analysis of H2, O2, N2, CH4, CO, CO2 in Argon.
General
The DID Argon Gas Chromatograph has been designed to exploit the variations of high frequency discharge in Argon. The carrier gas (Argon) is passing through a detection chamber where it is submitted to a strong electromagnetic field fed between two electrodes by a high-frequency generator.
Principle
The DID Argon Gas Chromatograph has been designed to exploit the variations of high frequency discharge in Argon. The carrier gas (Argon) is passing through a detection chamber where it is submitted to a strong electromagnetic field fed between two electrodes by a high-frequency generator.
In these conditions, luminescence takes place. The characteristics of the luminescence are modified by any impurity present in the initial gas passing through the chamber.
The luminous intensity of the discharge particularly gives, under well defined detector working conditions, a stable, continuous and linear function of gas composition for each impurity.
The luminous intensity of the discharge is measured by means of a photoreceptive cell which is part of the bridge, the unbalanced voltage of which becomes, after amplification, the output signal of the instrument.
Some Global References
| Company | Type of analyser | Model | Measurements |
|---|---|---|---|
| Air Products (Czech) | Argon | DID | O2, N2, CH4 |
| AGA (Finland) | Argon | DID | H2, O2, N2, CH4, CO |
| Linde (Italy) | Argon | DID | H2, O2, N2, CH4 |
| Air Liquide (Angola) | Argon/Carbon Dioxide | DID | H2, O2, N2 |
| Linde (Germany) | Argon | DID | H2, O2, N2, CH4, CO2 |
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 | Argon |
| Sample gas connection | 1/8’’ Swagelok SS |
| Sample flow rate | Approximately 3 to 5 l/h |
| Sample pressure | Atmospheric pressure |
| Carrier gas | Argon |
| Carrier gas connection | 1/8’’ Swagelok SS |
| 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 | 500 VA |
| 4-20 mA output | Eight configurable 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 |
Dimensions & chromatogram
(Dimensions can differ regarding the application)
Measurement capabilities
| Argon | |
|---|---|
| H2 | < 0.05 ppm |
| O2 | < 0.1 ppm |
| N2 | < 0.1 ppm |
| CH4 | < 0.05 ppm |
| CO | < 2 ppm |
| CO2 | < 0.8 ppm |
Features
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DID Argon