Oxygen Sensor FYA640O2 Applications: Determination of the conditions of life for fish and microorganisms in waters and fish tanks, biological treatment of municipal and industrial waste water, storage of organic liquids, examinations of drinking water, control of corrosion processes in heating system lines, examination of qualitykeeping of beverages. Measuring ranges: Measuring principle: Clark Working electrode: Pt cathode Reference electrode: Ag/AgCl counter electrode Membrane: PTFE Zero current at 0 % saturation: < 5 nA Meas. current at 100 % saturation: approx. 700 nA Accuracy, oxygen measurement: < ± 1 % of measured value Velocity in blower stream: approx. 10 cm/s Filling volume (electrolyte): 0.6 ml Temperature sensor: NTC type N (10 k at 25 °C) Accuracy of temp. measurement Shaft material: PVC, black Membrane cap: replaceable (spare) Shaft length/shaft diameter: 145mm/12mm Connecting cable: 1.5 m long with spray-coated ALMEMO® connector Polarisation voltage: 650 mV Service life (with one electrolyte filling): several months Total service life (durability): several years 11/2025 • We reserve the right to make technical changes. Accessories Order no. Adjustment set consisting of: 25 g sodium sulphite in 20 ml PE bottle for preparation of the null solution, vessel for adjustment of the saturation level ZB9640AS 25 g sodium sulphite in 20 ml PE bottle ZB9640NS 20 ml filling solution in PE bottle for O2 probe ZB9640NL Spare membrane cap with protection (2 pieces) ZB9640EM Oxygen sensor for O2 measurements in liquids incl. connecting cable 1.5 m long with spray-coated ALMEMO® connector FYA640O2