Gas Sampling Systems
—Dräger specializes in the engineering of gas sampling solutions for a wide range of different applications. No matter what your specific needs are, Dräger has the engineering staff and experience to design a system for your customer’s applications. In certain applications, the use of conventional gas detectors and sensors may be limited. This may be caused by the environment in which the device needs to be placed, the cable routing or even access restrictions. There may also be significant cost implications with installation of these devices.
Gas sampling solutions, or aspirated gas detection systems, operate by drawing a gas sample from the desired detection point to a remotely located detector. Typically, the sample is drawn via a pump into the sampling system.
Most sampling systems have four main components; Sampling, Transport, Measuring and Data Monitoring. Find out more about what makes a system below.
Sampling
—Sampling is an essential step between the process site and the detection point. The use of suitable filters removes fluids or particles in the gas sample, which could otherwise lead to cold spots or damage in the sampling line.
Quality of detection
They can also have a negative effect on the quality of detection at the measurement point itself. A suitable material for the sample pipework is essential to maximize the lifetime of a system. This is especially important for corrosive substances. The sample tubing shall be suitable for the environmental conditions and the defined hazardous location rating.
Transport of the gas flow
—Extractive gas analysis needs an effective treatment of the gas flow in the pipes to maintain the composition of the target gas and guarantee high-quality detection results. Unwanted effects like deposits, condensates in the pipes or diffusion through the lines, which can damage the fittings, pipes and tubes must be reduced to a minimum or wholly avoided. There are four main conditioning methods, including: cooling, filtering, heating, and condensing of the process gas. Each is essential for providing optimum detection results and prolonging the life of the system.
A critical part of the system
—A pump must be used if the pressure difference is insufficient to transport the gas from the process site to the detection (analyzer) point. If needed, a gas sampling system can be equipped a pump suitable for hazardous locations to provide a continuous sample.
Careful selection required
A pumped system allows gases to be drawn from remote areas and pulled into the sampling system. The type and material of the pump is selected to suit the gas properties, gas flow and pressure conditions. In many applications, the gas is corrosive or has challenging characteristics, requiring careful selection of an appropriate pump and associated fittings.
As an alternative to a pump, an aspirated system driven with pressurized air may be used. These systems, typically require less maintenance than a pumped system.
Measuring
—In gas sampling systems, once the gas conditioning has been completed, it is passed to the detection system where there are a variety of measuring methods available for different applications.
Different applications and targets.
Depending on the types of gases or vapors that require monitoring, different sensor types are required. Dräger has one of the world’s most extensive sensor portfolios to measure various types of substances, including Electrochemcial (EC), Catalytic Bead (CatEx), Infrared (IR), Open Path, and Photoionization (PID) sensors.
Data monitoring
—When operating a system, multiple parameters must be monitored to ensure accurate interpretation of the gas sampling system. This assures the correct operation of the system and the process. These parameters include the gas concentration, temperatures, and gas flow.
Access to information
The safety control unit can be combined with the existing gas detection system to allow the operator access to this information along with many other safety parameters including:
- Real-time trend view of the gas concentration with the visualization software
- Status information of the devices (Inhibit, warning signals, gas name & values)
- Remote data logging of gas levels and alarms on both timed intervals and events
- Alerts via SMS or Email to dedicated key personnel
- Multiple data outputs are possible
Gas Sampling Applications
—There are many scenarios and applications where Gas Sampling situations can be deployed. We've listed just a few of them below. Simply click on the title (or small blue arrow) to find out more.
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Speak with an Expert
—It is essential to understand a customer's process conditions to create the best solution to the various application needs. If you have a specific application in mind or would like to discuss further, please complete the short form below and one of our gas sampling experts will be in touch as soon as possible.
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