DID Gas Chromatograph

DID Gas Chromatographs - Helium - Orthodyne Gas Chromatography
DID Gas Chromatographs 600 Helium - Orthodyne Gas Chromatography

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 with the DID technology.

 Pattern of Approval Russia | Pattern of Approval China (all certificates)


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.


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

Type of configurations

DID Gas Chromatograph - 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 Gas Chromatograph Line 500 - Orthodyne

DID Gas Chromatograph Line 500 - Brochure

DID Gas Chromatograph - 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.

DID Gas Chromatograph Line 600 - Orthodyne

DID Gas Chromatograph Line 600 - Brochure

Technical specifications

Accuracy1 % of the reading scale
Drift1 % over 24 hours
Temperature drift 1 % per degree
Operating temperature ± 20°C without wide variations of temperature
Sampling gas He, N2 , H2, O2, Ar, CO2 , Kr, Xe
Sample gas connection1/8’’ Swagelok OR 1/8’’ VCR.
Sample flow rateApproximately 3 to 5 l/h
Sample pressure< 100 mBar
Carrier gasHelium
Carrier gas connection1/8’’ Swagelok OR 1/8’’ VCR.
Carrier gas pressure7 bar
Carrier gas flow rate4 l/h
Recommended qualityminimum 6.0
Power supply220 Vac, 50-60 Hz
Power consumption420 VA
4-20 mA outputEight confi gurable outputs
depending on the application.
RJ-45 connectionComputerised 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

CH4< 1 ppb< 1 ppb< 1 ppb< 1 ppb< 1 ppb
CO< 1 ppb< 1 ppb< 1 ppb< 1 ppb< 1 ppb
H2< 1 ppb/< 1 ppb< 1 ppb< 1 ppb
N2< 1 ppb< 1 ppb/< 1 ppb< 1 ppb
O2 + Ar/< 1 ppb< 1 ppb/< 1 ppb
Ar///< 1 ppb/
Ne////< 100 ppb
Kr////< 1 ppb
CO2////< 1 ppb
Xe////< 5 ppb

Dimensions & chromatogram

DID Gas Chromatograph Helium Dimensions - Orthodyne

(Dimensions can differ regarding the application)

DID Gas Chromatograph Helium Chromatogram - Orthodyne


< 1 ppb resolution guaranteed
User-friendly interface
Adjustable alarm and oven settings
Fast response time
Possibility of auto-calibration programming
CE marked
Chromdyne software


Discover which analyser(s) you need for your analytical requests. Check the application here !

Find a distributor

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DID Gas Chromatograph Helium Brochure - Orthodyne
DID Helium
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