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How metals are sampled
- Isokinetically. Metals occur both in particles and in the gas phase. The sample is therefore taken isokinetically, with interchangeable glass nozzles of 4–12 mm for gas velocities of 5–35 m/s.
- Filter and absorption. The particles are caught on the filter in the heated filter box and the gas phase in the absorption bottles. Both are analysed.
- No condensation. The heated glass probe and filter box prevent condensation upstream of the filter.
- Glass all the way. Nozzle, probe tube, filter holder and outlet are of chemically resistant glass.
- Moisture at the same time. The moisture content of the flue gas can be determined gravimetrically during the same sampling.
The parts of the system
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GM11-101 · GM11-102CU-1-10 and CU-1-20 control units
Vacuum pump, drying tower, flow meter and gas meter in one portable unit, for sample flows up to 10 or 20 l/min.
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GM25-101 · GM25-102Bottle rack with absorption bottles
250 ml bottles of borosilicate glass with a glass insert and a sintered glass frit (porosity P1), two or three per rack.
Metals with the dust sampler
Metals can also be determined with the dust sampler and a titanium probe system. The filter cassettes come in titanium when the filter is to be analysed for metals, and the outlet adapter for the 47 mm filter holder comes with up to four Swagelok connections for parallel wet chemical sampling. Read about the ADS-1 and the probes.
Frequently asked questions about metals sampling
Which metals does EN 14385 cover?
Antimony, arsenic, lead, cadmium, cobalt, copper, chromium, manganese, nickel, thallium and vanadium. Mercury is sampled according to EN 13211.
Why are both the filter and the absorption solution analysed?
The metals occur both bound to particles and in the gas phase. The filter catches the particles and the absorption solution catches what passes the filter, so both are needed for a correct result.
Which probe length do I need?
The EVA Light comes in 1,000 and 1,500 mm. The probe must reach the measurement points that the measurement plane requires.
Can you measure for us instead?
Yes. We sample metals and mercury under accreditation, and the analysis is done by an accredited laboratory – see metals in flue gas and mercury measurement.