DID Argon Gas Chromatographs | Orthodyne Gas Chromatography

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

Type of configurations

DID Argon - 500

Process Line

This new line 500 has been designed for stand alone operation. Easy configuration and quick start-up make this new system ideal for process gas analysis.

In addition to its user-friendly interface (touch screen display), the new line 500 has its own chromatographic software that allows the concentration of each impurity to be displayed directly. Moreover, the new line 500 can be remotely controlled through Ethernet or Internet.

DID Argon - 600

Laboratory Line

The new line 600 has been designed for working with Chromdyne software on a computer. It make this new system ideal for laboratory process gas analysis. Moreover, the new line 600 can be remotely controlled through Ethernet or Internet.

Technical specifications

Accuracy	1 % of the reading scale
Drift	1 % over 24 hours
Temperature drift	1 % per degree
Operating temperature	± 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	< 100 mBar
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 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