The PIUSI K33 ATEX is an oval gear mechanical meter engineered for an accu- rate measuring of the quantity of fluid dispensed that meets the ATEX/IECEx requirements related to the use in potentially explosive atmospheres. Reliable and easy to install, it can be calibrated on site and simply fitted with both rigid or flexible pipes or can be put directly on pumps and tanks. The new commercial mechanical flow meter meets ATEX requirements for accurate metering of the dispensed quantity of fluid (petrol, kerosene, diesel fuel) in environments with a high explosion risk. It is reliable, inexpensive and easy to install and calibrate at the place of installation. Due to its low flow resistance, it is also able to operate under gravity. The K33 ATEX flow meter can be installed in any position on either rigid or flexible pipes or directly on pumps or tanks. The equipment is classified as Group II, category 2 G IIB T=85°C (T6), so the flow meter is suitable for working in areas classified as 1 and 2 in accordance with directive 99/92/CE.