Gas Analyzers of the GA Series

A gas analyzer continuously determines which gases a mixture contains and at what concentration. A gas warning device reports that a limit has been exceeded. An analyzer names the value itself, continuously and in percent by volume, ppm or mg/m³. With it you run the process, assure quality and document emissions. You can set alarm thresholds in addition and route them to the relay outputs.

Which analyzer suits a measuring task comes down to four questions: How many components have to be captured at once? Which measurement principle works for these gases? In which matrix is the measurement taken — hot, moist, corrosive? And stationary or mobile? The GA series covers these four axes with ten instruments.

One component or several

The GA210 is a single-gas analyzer: one component, a clearly defined measuring range, correspondingly compact and economical. The GA220 combines several measurement principles in one 19" housing — the workhorse for emission monitoring and complex processes. The GA320 sits between them and measures up to six infrared-active gases.

The number of sample gas inlets is a quantity of its own. Up to eight of them bring several sampling points to the same instrument, which switches between them under program control or on a cycle. Eight inlets therefore stand for eight extraction points. A single-gas instrument can use them as well.

We fit every instrument with the sensors your measuring task calls for. If you plan one component today and expect three later, settle the expansion path in advance. That question decides the cost later on.

The principle follows the gas

No single method covers everything, which is why we combine them:

• NDIR for infrared-active gases such as CO, CO₂, CH₄, SO₂ and NO — the backbone of process and emission measurement.
• Paramagnetic measurement for oxygen. Our cell works without moving parts and is therefore insensitive to vibration — an argument for installation close to the plant.
• Zirconium oxide sensors for oxygen in hot gases, typically in combustion control.
• TDLAS as a laser method for methane, highly selective and fast.
• Thermal conductivity detection for binary mixtures, hydrogen in nitrogen for instance.
• Electrochemical cells where optical methods reach their limits, with H₂S for example.

Gas chromatography and FTIR lie outside our range. For many tasks one of the methods above still carries, and then we propose it. Which case applies to you is settled from the technical questionnaire for your enquiry.

Why our analyzers need test gas less often

Total cost of ownership is decided in operation. Our NDIR analyzers perform a patented automatic zero-point correction without test gas. That reduces maintenance effort, because the test gas supply falls away. You save procurement, storage, shelf-life checks and the replacement of cylinders. Other instruments correct their zero point automatically as well. The difference is the cylinder.

Dual-beam vacuum reference technology holds reading drift between two calibrations below 3 % per year as a rule. The datasheet of the individual instrument remains authoritative.

Add to that a design built for the long run: over 30 years of service life and a spare parts supply of 10+ years.

The analyzer is only the end of the measuring chain

In extractive measurement a probe takes a partial flow that has to be conditioned before it reaches the instrument. Moist or particle-laden sample gas causes condensation in the analyzer, falsifies readings and damages components. A sample gas cooler of the RCI series lowers the dew point to 5 °C and residual moisture to 0.86 vol.-%. Saving on conditioning is saving at the wrong end.

Stationary, mobile, or purpose-built for biogas

The GA100 Portable is battery-powered and intended for on-site measurements. For biogas plants there is the BioBasic as a plug-and-play instrument for CH₄, CO₂, H₂S, O₂ and H₂; it carries flame arresters to protect the plant but is not ATEX-certified for hazardous zones. For feed-in monitoring of upgraded biomethane the BioBasic Biomethane, the GA220 Biomethane and the Biomethane TDLAS are available.

All instruments are developed and manufactured in Germany.