Question 1

How do I choose between an extractive analyser and one mounted directly in the pipe?

Accepted Answer

The extractive analyser takes a sample through a probe, conditions it by filtering, cooling or heating, and carries it to a cabinet where the instrument is protected from dust, vibration and temperature. It allows several technologies and easy calibration, but requires maintenance of the sampling line. The in situ analyser measures directly in the process stream, eliminates sampling and responds quickly, but it is exposed to the conditions in the pipe. The choice depends on dust loading, gas temperature, access to the measuring point and the team's ability to maintain the sample system.

Question 2

Why does an analyser's result depend so much on the sampling and sample conditioning system?

Accepted Answer

The analyser measures only what reaches it. A sample in which water condenses, in which soluble gases are lost, or in which particles have clogged the filter no longer represents the process. For this reason the sample system is designed together with the analyser: materials compatible with the fluid, temperature kept above the dew point where necessary, small dead volumes and suitable filters. In practice, many deviations blamed on the instrument come from the sample line, and correcting it brings greater improvements than replacing the analyser.

Question 3

Which standards are relevant for stack emissions monitoring in the European Union?

Accepted Answer

The general framework is Directive 2010/75/EU on industrial emissions, applied through the integrated environmental permit of each installation. For data quality, standard EN 14181 describes the QAL1, QAL2 and QAL3 procedures and the annual surveillance test AST, while EN 15267 sets out the certification of automated measuring systems. There are also method standards for reference measurements, for example EN 13284-1 for dust. The exact requirements, the parameters to be measured and the limit values are found in your permit, so it is useful to attach it to the quotation request so that we can establish together the gases, measuring ranges and conformity documents needed.

Question 4

What details should I send to receive a technical quotation for an analyser?

Accepted Answer

The first thing to specify is the fluid measured and its state at the sampling point: composition, temperature, pressure, dust and moisture. Then indicate the components or property to be determined, the concentration range, the acceptable response time, the installation area, with the ATEX classification if applicable, and the signals required by the control system. If you are replacing an existing instrument, send the model or a photograph of the nameplate. For emissions, add the limits from the permit. With this information we check the fit and reply with a technical quotation, without repeated clarifications.

Question 5

How long does delivery take, and what happens when the analyser or part is not available locally or at the supplier?

Accepted Answer

Delivery takes 24–72 h when the item is available locally or at the supplier. Complete analysers, sampling systems and spectrometers are ordered, as a rule, in 1–4 weeks, and depending on the brand and the specifications it may take longer, especially for special configurations or systems assembled to order. When we know the real lead time, we state it in the quotation so that you can plan the plant shutdown or the installation. For wear consumables, we recommend ordering in good time, before planned interventions.

Question 6

How often must a process or emissions analyser be calibrated and maintained?

Accepted Answer

The interval depends on the technology, the process conditions and the permit requirements; there is no universal value. For emissions systems, calibrations with certified gases and drift checks are laid down in the quality assurance procedures, and the annual surveillance test confirms the calibration. For process analysers, periodic automatic calibration, tracking of the drift trend and timely replacement of consumables, such as filters, columns, optical windows or electrodes, maintain accuracy. A documented maintenance plan, with clear responsibilities and wear parts to hand, reduces unplanned stoppages and helps demonstrate data quality to the environmental authority or auditors.

Process Analysers and Emissions Monitoring

Which product types do we supply?

Which brands do we quote in this category?

Spare parts and accessories

What we do for you

Frequently asked questions