OrthoPure DID Gas Chromatograph

OrthoPure Gas Chromatograph - Orthodyne Gas Chromatography
OrthoPure DID 600 Gas Chromatograph- Orthodyne


OrthoPure DID - Gas Chromatograph for PPB analysis

Analysis of H2, O2+Ar, N2, CH4, CO and CO2 in PPB level.


The OrthoPure DID Gas Chromatograph detector 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 OrthoPure Gas Chromatograph DID detector 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 OrthoPure DID 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 OrthoPure DID 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 are directly related to the quality of the carrier gas, so the use of ultra purity (UHP) Helium as the carrier gas is highly recommended.


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


Orthopure DID Gas Chromatograph Dimensions - Orthodyne

(Dimensions can differ regarding the application)


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

Accuracy<1 % of the reading scale or depends on LDL
Drift<1 % of the reading scale over 24 hours
Temperature drift<1 % of the reading scale per degree
Operating temperature~20°C without wide variations of temperature
Sampling gasHe, N2, H2, O2, Ar
Sample gas connection1/8’’ Swagelok SS or VCR
Sample flow rateApproximately 3 to 5 l/h
Sample pressureLower than 100 mBarg
Carrier gasHelium
Carrier gas connection1/8’’ Swagelok SS or VCR
Carrier gas pressureDepending on the application
Carrier gas flow rate4 l/h
Recommended qualityMinimum 6.0 or purified Helium
Power supply220 Vac, 50-60 Hz
Power consumption420 VA
4-20 mA outputEight configurable outputs depending on the application.
Digital outputOptional RS232, Modbus, Profibus
Output relays
(SPST 2 amperes / 250 Vac)
1 Analyser Failure Alarm contact
1 Alarm High contact
1 Alarm High High contact

Measurement capabilities

H2< 0.5 ppb< 0.5 ppb< 0.5 ppb/< 0.5 ppb
Ar/< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb
O2 + Ar/< 0.5 ppb< 0.5 ppb< 0.5 ppb/
N2< 0.5 ppb< 0.5 ppb/< 0.5 ppb< 0.5 ppb
CH4< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb
CO< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb
CO2< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb< 0.5 ppb


< 1 ppb resolution guaranteed (EPA 40)
User-friendly interface
Adjustable alarm and oven settings
Fast response time
Possibility of auto-calibration programming
CE marked
Chromdyne software

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