Vortex flow transmitter VA40 … ZG8 EX-D Flow measurement at the output of the fermentation plant and for the cogeneration plant. Measurement of the amount of sewage gas/biogas in wastewater treatment

Exact measurement of the amount of biogas is one of the most challenging applications in biomass and flow measurement technology. Biogas is very moist and has a tendency to condense. The composition varies and is quite aggressive. Combined with air it can turn into explosive mixtures and therefore it is important to take safety measures. Applied instruments must therefore be certified for the defined ex-zone.

The fermentation gas is measured directly at the exit of the fermentation tower and on the other side in front of the cogeneration plant. The flow to the flare is also partly measured.

Anaerobic degradation processes take place in the digestion tower during wastewater treatment in a sewage treatment plant, creating biogas (also sewage water or digestion gas), which mainly consists of methane and carbon dioxide.

The vortex flow transmitter model VA40 ... ZG8 EX-D / ATEX from the Höntzsch company has been specially developed for measurements in industrially polluted environments. The measuring range is 0.5…40 m/s at an operating temperature of -40… +100 /+180 °C and a line pressure of 3 bar overpressure. In addition to flow, flow rate and volume are available at the outputs. In addition to an analog 4-20mA and pulse output, also a HART interface. The transmitter is also optionally available with a display.

The vortex flow transmitter is used for single-phase gas mixtures with air, nitrogen, oxygen, methane, natural gas, ammonia, argon, carbon monoxide, superheated steam

The vortex sensor head is 40 mm, available in stainless steel, hastelloy and titanium. The integrated transducer UVA is supplied in an Ex-d explosion-proof housing, suitable for Ex categories 1/2G and 1/2D (zone 0/1 and zone 20/21).

Applications in the # industry, for the vortex flow transmitter VA40 ... ZG8 EX-D are flow measurements in various explosive atmospheres including air, exhaust air, sludge air, engine intake air, natural gas, waste gas, process gas, biogas, car exhaust emissions, flare gas, water vapor.